Abstract
Herpesviruses are double-stranded DNA viruses with distinct morphological features and are among the largest and most complex viruses. According to the International Committee on Taxonomy of Viruses (ICTV), in 2022, there were 133 herpesviruses classified into three families: Orthoherpesviridae, infecting mammals and birds; Malacoherpesviridae infecting marine molluscs; and Alloherpesviridae infecting fish and amphibians. Herpesviruses have a complex genomic architecture, characterised by unique regions flanked by repeated and inverted sequences. Unique regions can undergo rearrangements leading to the formation of genomic isomers, which could have important implications for the life cycle of the virus. Herpesviruses life cycle consists of two main phases: the lytic phase, during which viral genes are expressed and translated into viral proteins that regulate DNA replication, capsid formation and the production of new particles; and the persistence phase, in which the virus persists in the host without being eliminated by the immune system. This review offers an updated and comprehensive overview of the Herpesvirales order, detailing their morphological characteristics, providing an in-depth taxonomic classification, examining their genomic architecture and isomers, and describing their life cycle.
Keywords: Herpesvirus, Life cycle, Genomic architecture, Phylogeny
Background
Viruses play a major role in shaping life and driving evolution. They are the smallest and most abundant form of life, with an estimated 1031 particles in the biosphere, and occupy almost every ecosystem infecting all types of life forms [1–6]. Currently, there are four types of viral genome: double-stranded RNA (dsRNA), single-stranded RNA (ssRNA), double-stranded DNA (dsDNA), single-stranded DNA (ssDNA) (https://ictv.global/virus-properties, consulted on 28/01/25). Herpesviruses are dsDNA viruses belonging to the order Herpesvirales within the realm Duplodnaviria (Fig. 1) [7].
Fig. 1.
Overall representation of DNA viruses. Realms, kingdoms, phyla, classes and orders are shown for all viruses whereas families, subfamilies are shown for herpesviruses (adapted from https://ictv.global/taxonomy/visual-browser)
Herpesviruses are ubiquitous throughout the world and have co-existed with mankind for as long as there have been written records. Interestingly, ancient Egyptian hieroglyphics document the presence of herpetic lesions, suggesting that these viruses have been a concern issue for millennia [8]. The origin of herpesviruses has been studied since the 1990s, with several estimates suggesting that their most recent common ancestor existed between 150.1 and 209.9 million years ago, dating back to the Jurassic/Triassic periods [9–12]. It has long been thought that herpesviruses evolve with their hosts primarily through co-speciation [10, 13–15]. However, as the amount of genomic sequence available has increased and bioinformatic tools have evolved, the explanation for herpesviruses evolution has shifted. Current evidence suggest that host-switching events and intra-host speciation play a more important role in their evolutionary history [9, 13, 16].
Historically, the classification of herpesviruses has been defined on the basis of virion architecture and host species [17]. In recent decades, herpesvirus genetic data have accumulated and become extensive, with more than 1000 complete genome sequences now available in public databases (https://www.ncbi.nlm.nih.gov/datasets/genome/?taxon=548681, consulted on 28/01/2025). Currently, and based on genetic content, 133 distinct herpesvirus species have been identified and grouped into three families: Orthoherpesviridae, Malacoherpesviridae and Alloherpesviridae [7, 18] (https://ictv.global/taxonomy, consulted on 28/01/25). In addition, four new species (Babylonia areolata herpesvirus [19], Bufonid herpesvirus 1 [20], Lake sturgeon herpesvirus 1 [21] and Silurid herpesvirus 1 [22] have not yet been classified.
Herpesviruses are capable of infecting a wide range of animals including mammals, birds, fish, and invertebrates (marine molluscs) [13, 23]. Despite some differences in host specificity, tissue tropism, replication kinetics and pathogenic potential, herpesviruses share a common virion morphology and life cycle.
Most available reviews focus on the family Orthoherpesviridae, and more specifically the eight human herpesviruses species [8, 24–26]. The last comprehensive review providing a global overview of herpesvirus systematics, genomic architectures and lifecycles was published in 2013, when the order Herpesvirales comprised 90 herpesvirus species [27, 28]. Since then, 43 additional herpesviruses have been characterised and included in the ICTV classification while 4 new species need to be included.
Therefore, this review seeks to provide an updated and comprehensive overview of the order Herpesvirales with the aims to detail their morphological features, offer a complete and up to date taxonomic classification, and present an in-depth analysis of their genomic architecture. Additionally, the review includes a general description of their life cycle. This synthesis is intended to serve as a valuable reference for researchers, facilitating a deeper understanding of the biology, evolution, and significance of these viruses.
Herpesviruses virion structure
Herpesviruses, members of the order Herpesvirales are double-stranded DNA (dsDNA) viruses with morphological characteristics that distinguish them from other viruses. The mature herpesvirus virion structure has been described for 27 of the 49 alphaherpesviruses, 17 of the 27 betaherpesviruses, 18 of the 42 gammaherpesviruses, 2 of the 3 malacoherpesviruses and 12 of the 16 alloherpesviruses and is composed of an envelope surrounding a tegument, a protein-rich matrix between the envelope and the capsid. The capsid encloses the core consisting in tightly packed dsDNA genome (Fig. 2). The size of herpesvirus mature virion varies between 120 to 260 nm in diameter, depending on the thickness of the tegument and the state of the envelope [8].
Fig. 2.

Schematic representation of herpesvirus virion
Envelope
The envelope is a lipid bilayer that maintains the quasi-spherical shape of the virion. Its trilaminar appearance has been demonstrated by electron microscopy [29]. The envelope consists mainly of virally encoded glycoproteins (Fig. 2). The number and relative amounts of viral glycoproteins vary among herpesviruses. For example, in Simplexvirus humanalpha 1, also known as Human Simplex Virus 1 (HSV-1), the envelope contains at least 11 different virion-associated glycoproteins and the copy number of individual glycoproteins can exceed 1,000 per virion [8]. The glycoproteins form numerous protrusions on the virion envelope that are more numerous and shorter than those found on the surface of many other enveloped viruses [8].
Tegument
The tegument is sometimes asymmetrically distributed and its thickness can vary depending on the location of the virion with the infected cell and is determined by the virus rather than the host [30]. The tegument contains more than 20 different virally encoded proteins, some of which are present in hundreds of copies per virion [8].
Capsid
The structural features of the capsid are characteristic of all herpesviruses. It measures 100 nm in diameter, contains 161 capsomers (150 hexons and 11 pentons) and has a capsid triangulation number of T = 16 [31–33]. Non-enveloped capsids are present in infected cells in three main forms: A-, B- and C-capsids, where A-capsids have no core structure and B-capsids contain the assembly scaffold but no genome. Only the C-capsids contain the complete dsDNA herpesvirus genome [8].
Core
The core of the mature virion contains the viral genome as a single molecule in the form of dsDNA packed in an ordered manner in the form of a torus [33–36]. The exact arrangement of the DNA in the torus is not known but the DNA is tightly packed so that the internal volume of the capsid is approximately equal to the cylindrical volume of the genome [8, 37].
Towards a better characterization of herpesvirus particle structure
In total there is less than 60% of the described herpesvirus species for which the virion structure has been characterised. Furthermore, the number of proteins contained in the virions is not precisely known and may vary from one virus to another. Proteomics analyses have identified up to 71 structure-related proteins in virions of human, mice and monkey herpesviruses. These proteins are distributed as follows: 4 to 7 in the nucleocapsid, 9 to 20 in the tegument and 4 to 19 in the envelope plus a number of proteins whose location within virions is unknown [8, 38–42]. Recent advances including high-resolution cryo-electron microscopy and integrative structural approaches provide powerful tools to better characterize herpesvirus particles. For example, cryo-electron-microscopy has revealed significant differences between A- and B-capsids and mature C-capsids, providing new opportunities to understand why only the C-capsids contain the complete dsDNA herpesvirus genome [43]. Moreover, native mass spectrometry could be used to accurately determine the mass of viral capsids and identify the proteins they contain [44]. Advancing the structural characterisation of herpesvirus virions would greatly improve our understanding of how these viruses infect their hosts and could be helpful to design not only new diagnostic tools but also new strategies to block infection.
Herpesvirales clade
Herpesviruses are host-specific pathogens classified into three families on the basis of the DNA polymerase sequences: Orthoherpesviridae infecting mammals, birds, and reptiles (118 species); Alloherpesviridae infecting fish and amphibians (16 species); and Malacoherpesviridae infecting marine molluscs (3 species) (Fig. 3A).
Fig. 3.
Herpesvirales phylogeny based on DNA polymerase sequences. DNA polymerase protein sequences from all available herpesviruses were extracted from public databases and aligned using Mafft v.7.520.A phylogenetic tree was constructed from the alignment file using phyml v.3.3.2 and the LG model with gamma distribution, invariant sites and amino acid frequencies. The resulting tree was then manually improved using Illustrator to add the names abbreviations, genomic architecture, size, isomers and latency characterization of the herpesviruses and the host they infect. A DNA polymerase tree, ICTV names, abbreviations and hosts. B Size and genomic architecture, grey colored sizes correspond to partial genome and black colored sizes correspond to complete genome. U: Unique region, TR: Terminal Repeat, IR: Internal Repeat, UL: Unique Long, US: Unique Short, TRL/IRL: Terminal/Inverted Repeat Long, TRS/IRS: Terminal/Internal Repeat Short, X: X region, a: a region, n: number of the repeat. C Genomic isomers. D Ability to establish persistence described in literature. L: latency demonstrated, P: Persistence described.
Orthoherpesviridae
The family Orthoherpesviridae contains 118 described herpesviruses species and is divided into three subfamilies: Alphaherpesvirinae with 49 species; Betaherpesvirinae with 27 species; and Gammaherpesvirinae with 42 species (https://ictv.global/taxonomy, consulted on 28/01/25).
Alphaherpesvirinae
Viruses in this subfamily include the Simplexvirus genus infecting humans, primates, rabbits, marsupials and bats the Varicellovirus genus infecting humans, cattle, dogs, primates, bovids, deer, horses, donkeys, giraffes, felines, whales, seals and swine the Scutavirus genus infecting marine and terrestrial turtle, Mardivirus and Iltovirus genera both infecting birds (Fig. 3A) (Table 1).
Table 1.
Summary table of viruses of the subfamily Alphaherpervirinae
| Scientific name | Common name | Abbv | Acc. Number (ICTV) | Reference Acc. Number | Host | Complete genomes | Sequencing technology for ref. genome | |
|---|---|---|---|---|---|---|---|---|
| Simplexvirus | atelinealpha1 | Ateline alphaherpesvirus 1 | HVA1 | KY385637 | [45] | Primate | 1 | Sanger, Illumina |
| bovinealpha2 | Bovine alphaherpesvirus 2 | BMV | MT862163 | [46] | Cattle | 2 | Sanger, Illumina, ONT | |
| cercopithecinealpha2 | Cercopithecine alphaherpesvirus 2 | SA8 | AY714813 | [47] | Primate | 1 | Sanger | |
| humanalpha1 | Herpes simplex virus type 1 | HSV1 | JN555585 | [48] | Human | 71 | Illumina | |
| humanalpha2 | Herpes simplex virus type 2 | HSV2 | JN561323 | [48] | Human | 14 | Illumina | |
| leporidalpha4 | Leporid herpesvirus 4 | LHV4 | JQ596859 | [49] | Lepus | 1 | 454 | |
| macacinealpha1 | Macacine alphaherpesvirus 1 | BV | AF533768 | [50] | Primate | 18 | Sanger | |
| macacinealpha2 | Macacine alphaherpesvirus 2 | McAHV2 | KY628968 | [45] | Primate | 1 | Sanger, Illumina | |
| macacinealpha3 | Macacine alphaherpesvirus 3 | McAHV3 | KY628970 | [45] | Primate | 1 | Sanger, Illumina | |
| macropodidalpha1 | Macropodid alphaherpesvirus 1 | MaAHV1 | KT594769 | [51] | Marsupial | 1 | Illumina | |
| macropodidalpha2 | Macropodid alphaherpesvirus 2 | MaAHV2 | MT900475 | [52] | Marsupial | 1 | Illumina | |
| macropodidalpha4 | Macropodid alphaherpesvirus 4 | MaAHV4 | MT900474 | [52] | Marsupial | 1 | Illumina | |
| paninealpha3 | Panine alphaherpesvirus 3 | ChHV | JQ360576 | [53] | Primate | 1 | 454 | |
| papiinealpha2 | Herpesvirus papio 2 | HPV2 | DQ149153 | [54] | Primate | 6 | Sanger | |
| pteropodidalpha1 | Fruit bat alphaherpesvirus 1 | FBAHV1 | AB825953 | [55] | Bat | 1 | 454 | |
| pteropodidalpha2 | Bat alphaherpesvirus | PLAHV | LC492974 | [56] | Bat | 1 | Sanger, ONT | |
| saimiriinealpha1 | Herpesvirus saimiri 1 | HVS1 | HM625781 | [57] | Primate | 1 | Sanger, 454 | |
| Mardivirus | anatidalpha1 | Duck enteritis virus | DEV | JF999965 | [58] | Bird | 10 | 454 |
| columbidalpha1 | Pigeon herpesvirus | PHV | KX589235 | [59] | Bird | 2 | Sanger | |
| gallidalpha2 | Marek's disease virus | MDV | AF243438 | [60] | Bird | 65 | Sanger | |
| gallidalpha3 | Gallid herpesvirus 3 | GaAHV3 | HQ840738 | [61] | Bird | 2 | 454 | |
| meleagridalpha1 | Turkey herpesvirus | HVT | AF291866 | [62] | Bird | 1 | Sanger | |
| spheniscidalpha1 | Spheniscid alphaherpesvirus 1 | SpAHV1 | LT608135 | [63] | Bird | 2 | 454 | |
| Varicellovirus | bovinealpha1 | Infectious bovine rhinotracheitis virus | IBRV | JX898220 | [64] | Cattle | 50 | Sanger, Illumina |
| bovinealpha5 | Bovine encephalitis herpesvirus | BoAHV5 | AY261359 | [65] | Cattle | 4 | Sanger | |
| bubalinealpha1 | Water buffalo herpesvirus | BuAHV1 | KU936049 | [66] | Cattle | 1 | Illumina | |
| canidalpha1 | Canine herpesvirus | CHV | KT819633 | [67] | Dog | 11 | Illumina | |
| caprinealpha1 | Goat herpesvirus | CpAHV1 | MG989243 | [68] | Bovid | 1 | Illumina | |
| cercopithecinealpha9 | Simian varicella virus | SVV | AF275348 | [69] | Primate | 1 | Sanger | |
| cervidalpha1 | Cervid alphaherpesvirus 1 | CvAHV1 | MH036942 | Unpublished | Deer | 1 | Illumina | |
| cervidalpha2 | Cervid alphaherpesvirus 2 | CvAHV2 | MH036943 | Unpublished | Deer | 1 | Illumina | |
| cervidalpha3 | Cervid alphaherpesvirus 3 | CvAHV3 | MH036941 | Unpublished | Deer | 1 | Illumina | |
| equidalpha1 | Equine abortion virus | EAV | AY665713 | [70] | Horse | 28 | Sanger | |
| equidalpha3 | Equine coital exanthema virus | EqAHV3 | KM051845 | [71] | Horse | 1 | 454, Illumina | |
| equidalpha4 | Equine rhinopneumonitis virus | EqAHV4 | AF030027 | [72] | Horse | 10 | Sanger | |
| equidalpha6 | Ulcerative stomatitis in donkeys | AsHV | MT012704 | [73] | Donkey | 1 | Illumina | |
| equidalpha8 | Asinine herpesvirus 3 | EqAHV8 | MF431611 | [74] | Horse | 6 | Illumina | |
| equidalpha9 | Equid alphaherpesvirus 9 | EqAHV9 | AP010838 | [75] | Giraffe | 1 | Sanger | |
| felidalpha1 | Feline viral rhinotracheitis virus | FVRV | FJ478159 | [76] | Feline | 37 | 454 | |
| humanalpha3 | Varicella-zoster virus | VZV | X04370 | [77] | Human | 21 | Sanger | |
| monodontidalpha1 | Beluga whale alphaherpesvirus 1 | MoAHV1 | MF678601 | [78] | Whale | 1 | Illumina | |
| phocidalpha1 | Phocid herpesvirus 1 | PhHV1 | MH509440 | [79] | Seal | 0 | - | |
| suidalpha1 | Pseudorabies virus | PRV | JF797218 | [80] | Swine | 51 | Illumina | |
| Iltovirus | cacatuidalpha2 | Cacatuid herpesvirus 2 | CaHV-2 | MK360902 | [81] | Bird | 1 | Illumina |
| gallidalpha1 | Infectious laryngotracheitis virus | ILTV | JN596962 | [82] | Bird | 65 | 454 | |
| psittacidalpha1 | Pacheco's disease virus | PDV | AY372243 | [83] | Bird | 1 | Sanger | |
| psittacidalpha5 | Psittacid alphaherpesvirus 5 | PsHV-5 | MK955929 | [84] | Bird | 2 | Illumina | |
| Scutavirus | chelonidalpha5 | Chelonid alphaherpesvirus 5 | ChHV5 | HQ878327 | [85] | Turtle | 0 | - |
| testudinidalpha3 | Testudinid herpesvirus 3 | TeHV3 | KM924292 | [86] | Turtle | 5 | Illumna |
This table contains the scientific and common names, abbreviations, accession numbers from ICTV, related articles, hosts, number of complete genomes available on NCBI and the sequencing technology used for the reference genome (according to the accession number and related articles) of viruses of the Alphaherpesvirinae subfamily
Betaherpesvirinae
Viruses in this subfamily include the Cytomegalovirus genus infecting primates and humans, the Muromegalovirus genus infecting mice and rats, the Proboscivirus genus infecting elephants, the Quwivirus genus infecting rodents, and bats, and the Roseolovirus genus infecting humans, primates, swine and mice (Fig. 3A) (Table 2).
Table 2.
Summary table of viruses of the subfamily Betaherpervirinae
| Scientific name | Common name | Abbv | Acc. Number (ICTV) | Reference Acc. Number | Host | Complete genomes | Sequencing technology for ref. genome | |
|---|---|---|---|---|---|---|---|---|
| Cytomegalovirus | aotinebeta1 | Aotine betaherpesvirus 1 | MCMV | FJ483970 | Unpublished | Primate | 1 | not published |
| cebinebeta1 | Cebine herpesvirus 1 | CMCMV | JQ264772 | Unpublished | Primate | 0 | - | |
| cercopithecinebeta5 | Cercopithecine betaherpesvirus 5 | SCMV | FJ483968 | Unpublished | Primate | 3 | not published | |
| humanbeta5 | Human cytomegalovirus | HCMV | AY446894 | [87] | Human | 345 | Sanger | |
| macacinebeta3 | Rhesus cytomegalovirus | RhCMV | AY186194 | [88] | Primate | 30 | Sanger | |
| macacinebeta8 | Macaque cytomegalovirus | McBHV8 | JN227533 | [89] | Primate | 7 | Illumina | |
| mandrillinbeta1 | Mandrillus leucophaeus cytomegalovirus | MdBHV1 | KR297253 | [90] | Primate | 1 | 454 | |
| paninebeta2 | Panine betaherpesvirus 2 | CCMV | AF480884 | [91] | Primate | 1 | Sanger | |
| papiinebeta3 | Olive baboon cytomegalovirus | BCMV | AC090446 | Unpublished | Primate | 0 | - | |
| papiinebeta4 | Chacma baboon cytomegalovirus | PaBHV4 | KR351281 | [90] | Primate | 1 | 454 | |
| saimiriinebeta4 | Saimiriine betaherpesvirus 4 | SMCMV | FJ483967 | Unpublished | Primate | 1 | not published | |
| Muromegalovirus | muridbeta1 | Murine cytomegalovirus | MCMV | GU305914 | [92] | Mice | 15 | Sanger |
| muridbeta2 | Rat cytomegalovirus strain Maastricht | RCMV | AF232689 | [93] | Rat | 1 | Sanger | |
| muridbeta8 | Rat cytomegalovirus strain England | RCMVE | JX867617 | [94] | Rat | 3 | 454, Sanger | |
| Quwivirus | caviidbeta2 | Guinea pig cytomegalovirus | GPCMV | KC503762 | [95] | Rodent | 2 | Illumina |
| miniopteridbeta1 | Miniopterus schreibersii herpesvirus | MsHV | JQ805139 | [96] | Bat | 1 | 454 | |
| tupaiidbeta1 | Tupaiid betaherpesvirus 1 | THV | AF281817 | [97] | Shrew | 1 | Sanger | |
| Roseolovirus | humanbeta7 | Human herpesvirus 7 | HHV7 | AF037218 | [98] | Human | 2 | Sanger |
| humanbeta6a | Human herpesvirus 6A | HHV6A | X83413 | [99] | Human | 4 | Sanger | |
| humanbeta6b | Human herpesvirus 6B | HHV6B | AF157706 | [100] | Human | 3 | Sanger | |
| macacinebeta9 | Macaca nemestrina herpesvirus 7 | MneHV7 | KU351741 | [101] | Primate | 1 | Illumina | |
| muridbeta3 | Mouse thymic virus | MTV | KY355735 | [102] | Mice | 2 | Illumina, PacBio, Sanger | |
| suidbeta2 | Porcine cytomegalovirus | PCMV | KF017583 | Unpublished | Swine | 1 | Illumina | |
| Proboscivirus | elephantidbeta1 | Elephantid endotheliotropic herpesvirus 1 | EEHV1 | KC462165 | [103] | Elephant | 5 | Illumina |
| elephantidbeta3 | Elephantid endotheliotropic herpesvirus 3 | EEHV3 | MN373268 | [104] | Elephant | 0 | - | |
| elephantidbeta4 | Elephantid endotheliotropic herpesvirus 4 | EEHV4 | KT832477 | [105] | Elephant | 1 | Sanger, Illumina | |
| elephantidbeta5 | Elephantid endotheliotropic herpesvirus 5 | EEHV5 | KF921519 | [103] | Elephant | 2 | Illumina |
This table contains the scientific and common names, abbreviations, accession numbers from ICTV, related articles, hosts, number of complete genomes available on NCBI and the sequencing technology used for the reference genome (according to the accession number and related articles) of viruses of the Betaherpesvirinae subfamily
Gammaherpesvirinae
Viruses in this subfamily include the Lymphocryptovirus genus infecting humans and primates, the Bossavirus genus infecting dolphins, the Macavirus infecting bovids, cattle, swine and hipparion, the Manticavirus genus infecting marsupials, the Patagivirus genus infecting bats, the Percavirus genus infecting horses, felines, badgers, seals and bats and the Rhadinovirus genus infecting primates, cattle, rodents, mice and humans (Fig. 3A) (Table 3).
Table 3.
Summary table of viruses of the subfamily Gammaherpervirinae
| Scientific name | Common name | Abbv | Acc. Number (ICTV) | Reference Acc. Number | Host | Complete genomes | Sequencing technology for ref. genome | |
|---|---|---|---|---|---|---|---|---|
| Bossavirus | delphinidgamma1 | Common bottlenose dolphin gammaherpesvirus 1 | DeGHV1 | KY965444 | [106] | Dolphin | 1 | Illumina |
| Macavirus | alcelaphinegamma1 | Wildebeest-associated malignant catarrhal fever virus | MCFV | AF005370 | [107] | Bovid | 0 | - |
| alcelaphinegamma2 | Hartebeest-associated malignant catarrhal fever virus | AlGHV2 | KF274499 | [108] | Bovid | 1 | Sanger | |
| bovinegamma6 | Bovine lymphotropic herpesvirus | BLV | KJ705001 | [109] | Cattle | 1 | Illumina | |
| caprinegamma2 | Caprine herpesvirus 2 | CpHV2 | AF283477 | [110] | Bovid | 0 | - | |
| hippotraginegamma1 | Roan antelope herpesvirus | HiGHV1 | DQ083950 | [111] | Hipparion | 0 | - | |
| ovinegamma2 | Sheep-associated malignant catarrhal fever virus | OvGHV2 | AY839756 | [112] | Bovid | 2 | Sanger | |
| suidgamma3 | Porcine lymphotropic herpesvirus 1 | PLVH1 | AF478169 | [113] | Swine | 0 | - | |
| suidgamma4 | Porcine lymphotropic herpesvirus 2 | PLHV2 | AY170317 | [114] | Swine | 0 | - | |
| suidgamma5 | Porcine lymphotropic herpesvirus 3 | PLHV3 | AY170316 | [114] | Swine | 0 | - | |
| Percavirus | equidgamma2 | Equine herpesvirus 2 | EHV2 | U20824 | [115] | Horse | 20 | Sanger |
| equidgamma5 | Equine herpesvirus 5 | EHV5 | KM924295 | [116] | Horse | 2 | Illumina | |
| felidgamma1 | Felis catus gammaherpesvirus 1 | FcaGHV1 | KT595939 | [117] | Feline | 1 | Sanger, Illumina | |
| mustelidgamma1 | Badger herpesvirus | BadHV | AF376034 | [118] | Badger | 0 | - | |
| phocidgamma3 | Harp seal herpesvirus | HaSHV | KP136799 | [119] | Seal | 0 | - | |
| rhinolophidgamma1 | Rhinolophus gammaherpesvirus 1 | RGHV-1 | LC333428 | [120] | Bat | 1 | Ion Torrent | |
| vespertilionidgamma1 | Bat gammaherpesvirus 8 | VeGHV1 | KU220026 | [121] | Bat | 0 | - | |
| Rhadinovirus | atelinegamma2 | Herpesvirus ateles strain 810 | AtGHV2 | M22036 | [122] | Primate | 0 | - |
| atelinegamma3 | Herpesvirus ateles | HVA | AF083424 | [123] | Primate | 1 | Sanger | |
| bovinegamma4 | Bovine herpesvirus 4 | BHV4 | AF318573 | [124] | Cattle | 0 | - | |
| colobinegamma1 | Colobine gammaherpesvirus 1 | CbGHV1 | MH932584 | [125] | Primate | 1 | Illumina | |
| cricetidgamma2 | Rodent herpesvirus Peru | RHVP | HQ221963 | [126] | Rodent | 1 | 454 | |
| humangamma8 | Kaposi's sarcoma-associated herpesvirus | KSHV | AF148805 | [127] | Human | 37 | Sanger | |
| macacinegamma11 | Japanese macaque rhadinovirus | JMRV | AY528864 | [128] | Primate | 3 | Sanger | |
| macacinegamma12 | Pig-tailed macaque rhadinovirus 2 | MneRV2 | KP265674 | [129] | Primate | 1 | Sanger | |
| macacinegamma5 | Rhesus rhadinovirus | RRV | AF083501 | [130] | Primate | 5 | Sanger | |
| macacinegamma8 | Retroperitoneal fibromatosis-associated herpesvirus | RFHV | KF703446 | [131] | Primate | 1 | Sanger, Illumina | |
| muridgamma4 | Murine gammaherpesvirus 68 | MHV68 | U97553 | [132] | Mice | 3 | Sanger | |
| muridgamma7 | Wood mouse herpesvirus | WMHV | GQ169129 | [133] | Mice | 1 | Sanger | |
| saimiriinegamma2 | Herpesvirus saimiri | HVS | X64346 | [134] | Primate | 1 | Sanger | |
| Patagivirus | vespertilionidgamma3 | Eptesicus fuscus gammaherpesvirus | EfHV | MF385016 | [135] | Bat | 1 | Illumina, ONT |
| Manticavirus | phascolarctidgamma1 | Koala gammaherpesvirus 1 | PcGHV1 | MG452722 | [136] | Marsupial | 0 | - |
| vombatidgamma1 | Wombat gammaherpesvirus 1 | VoGHV1 | MG452721 | [136] | Marsupial | 0 | - | |
| Lymphocryptovirus | callitrichinegamma3 | Marmoset lymphosarcoma virus | ClGHV3 | AF319782 | [137] | Primate | 1 | Sanger |
| gorillinegamma1 | Pongine herpesvirus 3 | GoGHV1 | AJ581752 | [138] | Primate | 0 | - | |
| humangamma4 | Epstein-Barr virus | EBV | AJ507799 | [139] | Human | 311 | Sanger | |
| macacinegamma10 | cynomolgus macaque lymphocryptovirus | McGHV10 | KP676001 | [140] | Primate | 1 | Illumina | |
| macacinegamma13 | Macaca arctoides gammaherpesvirus 1 | McGHV13 | NC_076963 | [141] | Primate | 1 | Sanger, Illumina | |
| macacinegamma4 | rhesus lymphocryptovirus | RLV | AY037858 | [142] | Primate | 1 | Sanger | |
| paninegamma1 | Pongine herpesvirus 1 | PnGHV1 | AJ581751 | [138] | Primate | 0 | - | |
| papiinegamma1 | Cercopithecine herpesvirus 12 | PaGHV1 | AJ581750 | [138] | Primate | 0 | - | |
| ponginegamma2 | Pongine herpesvirus 2 | PoGHV2 | AJ581753 | [138] | Primate | 0 | - |
This table contains the scientific and common names, abbreviations, accession numbers from ICTV, related articles, hosts, number of complete genomes available on NCBI and the sequencing technology used for the reference genome (according to the accession number and related articles) of viruses of the Gammaherpesvirinae subfamily
Malacoherpesviridae
Only few species have been characterized in the Malacoherpesviridae family. This family encompasses viruses infecting marine molluscs such as oysters, abalones and sea snails. To date three viruses species are characterized in this family: the abalone herpesvirus Aurivirus haliotidmalaco1, also known as Abalone Herpesvirus (AbHV-1), the gastropod herpesvirus Babylonia areolata herpesvirus (BaHV) (not classified by ICTV yet) and the oyster herpesvirus Ostreavirus ostreidmalaco1, better known as Ostreid Herpesvirus Type 1 (OsHV-1) (Fig. 3A) (Table 4) (https://ictv.global/taxonomy, consulted on 28/01/2025).
Table 4.
Summary table of viruses of the family Malacoherpesviridae
| Scientific name | Common name | Abbv | Acc. Number (ITCV) | Reference Acc. Number | Host | Complete genomes | Sequencing technology for ref. genome |
|---|---|---|---|---|---|---|---|
| Aurivirus haliotidmalaco1 | Abalone herpesvirus | AbHV1 | JX453331 | [143] | Abalone | 3 | Sanger, 454, Illumina |
| Babylonia areolata herpesvirus | Gastropod herpesvirus | - | BK064993 | [19] | Sea Snail | 1 | Illumina, ONT |
| Ostreavirus ostreidmalaco1 | Ostreid herpesvirus type 1 | OsHV1 | AY509253 | [32] | Oyster | 28 | Sanger |
This table contains the scientific and common names, abbreviations, accession numbers from ICTV, related articles, hosts, number of complete genomes available on NCBI and the sequencing technology used for the reference genome (according to the accession number and related articles) of viruses of the Malacoherpesviridae family
Alloherpesviridae
The viruses of the Alloherpesviridae family contains 13 characterised species, including 3 herpesviruses not classified yet by ICTV (Table 5, herpesviruses with an asterisk), clustered into four genera: the genus Batravirus infecting frogs, the genus Cyvirus infecting eels and carps, the genus Ictavirus infecting sturgeons and catfishes, and the genus Salmovirus infecting salmons (Fig. 3A) (Table 5) (https://ictv.global/taxonomy, consulted on 28/01/25).
Table 5.
Summary table of viruses of the family Alloherpesviridae
| Scientific name | Common name | Abbreviations | Acc. Number (ICTV) | Reference acc. Number | Host | Complete genomes | Sequencing technology for ref. genome | |
|---|---|---|---|---|---|---|---|---|
| Batravirus | ranidallo1 | Lucké tumor herpesvirus | LTHV | DQ665917 | [144] | Frog | 1 | Sanger |
| ranidallo2 | Frog virus 4 | FV4 | DQ665652 | [144] | Frog | 1 | Sanger | |
| ranidallo3 | Ranid herpesvirus 3 | RaHV3 | KX832224 | [145] | Frog | 1 | Illumina | |
| Bufonid herpesvirus 1 | BfHV1 | NC_040681 | [20] | Frog | 1 | Illumina | ||
| Ictavirus | Lake sturgeon herpesvirus 1 | LSHV | OK485036 | [21] | Sturgeon | 1 | Illumina | |
| Silurid herpesvirus 1 | MH048901 | [22] | Catfish | 1 | Illumina | |||
| acipenseridallo2 | White sturgeon herpesvirus 2 | AciHV2 | FJ815289 | [146] | Sturgeon | 0 | - | |
| ictaluridallo1 | Channel catfish virus | IcHV1 | M75136 | [147] | Catfish | 2 | Sanger | |
| ictaluridallo2 | Black bullhead herpesvirus | IcHV2 | MG271984 | [148] | Catfish | 1 | Sanger, Illumina | |
| Cyvirus | anguillidallo1 | Japanese eel herpesvirus | AngHV1 | FJ940765 | [149] | Eel | 3 | Sanger |
| cyprinidallo1 | Carp pox herpesvirus | CyHV1 | JQ815363 | [150] | Carp | 1 | Sanger | |
| cyprinidallo2 | Goldfish hematopoietic necrosis virus | CyHV2 | JQ815364 | [150] | Carp | 6 | Illumina | |
| cyprinidallo3 | Koi herpesvirus | KHV | DQ657948 | [151] | Carp | 21 | Sanger | |
| Salmovirus | salmonidallo1 | Herpesvirus salmonis | SalHV1 | AF023673 | [152] | Salmon | 0 | - |
| salmonidallo2 | Oncorhyncus masou herpesvirus | SalHV2 | EU349274 | [153] | Salmon | 0 | - | |
| salmonidallo3 | Epizootic epitheliotropic disease virus | SalHV3 | EU349277 | [153] | Salmon | 0 | - | |
This table contains the scientific and common names, abbreviations, accession numbers from ICTV, related articles, hosts, number of complete genomes available on NCBI and the sequencing technology used for the reference genome (according to the accession number and related articles) of viruses of the Alloherpesviridae family
Perspective on Herpesvirus classification
While the Orthoherpesviridae is the largest and most extensively described family, some studies suggest that the Alloherpesviridae and Malacoherpesviridae families may contain a greater number of as yet uncharacterised herpesviruses [154, 155]. Indeed, interrogation of publicly available sequencing data has recently led to the identification and characterisation of additional herpesviruses, as demonstrated by the detection of ancient HSV-1 and Simplexvirus humanalpha2 (HSV-2), strains in Neanderthal genome data [156], and the discovery of four novel malacoherpes-like viruses in SRA database samples [155]. In addition, environmental DNA sequencing-based approaches could facilitate detecting herpesviruses infecting hosts that are difficult to sample, such as terrestrial or marine wildlife species [157, 158]. Finally, methods such as the use of degenerated primers, loop-mediated isothermal amplification, microparticles, or tangential flow filtration, could further improve the detection and characterization of previously unknown herpesviruses [159–163]. While many herpesviruses remain uncharacterized, the 137 currently known herpesvirus species share a highly conserved virion structure,
consisting of a large, linear, double-stranded DNA genome, but exhibit considerable diversity in genetic content and genomic architecture.
Genomic architecture of Herpesvirales
Herpesvirus DNA genomes are linear, double stranded and their length varies from 119 kb for the Rhadinovirus muridgamma4 (MHV68) [132] to 295 kb for Cyvirus cyprinidallo3 (CyHV3) [151] (Fig. 3B).
An interesting feature of herpesviruses is their distinctive genomic organization [28]. In this section, the different genomic architectures of herpesviruses complete genome are described. To this end, genomic data were collected from the literature and from the genomic public database. For genome without known genomic structure, characterisation was performed manually by visualising genome via the self-alignment dotplot tool implemented in Geneious Prime (https://www.geneious.com/features/prime).
Seven distinct genomic architecture have been described:
Arch-1: consisting of two unique regions named Unique Long (UL) and Unique Short (US) with the US region flanked by inverted repeat regions (IRS: Internal Repeat Short and TRS: Terminal Repeat Short), (i.e. UL—IRS—US—TRS) (Table 6).
Arch-2: consisting of two unique regions (UL and US) both flanked by inverted repeat sequences (IRL: Internal Repeat Long, and TRL: Terminal Repeat Long for the UL and IRS/TRS for the US region), (i.e., TRL—UL—IRL—IRS—US—TRS) (Table 6).
Arch-3: similar to Arch-2 with three copies of “a” region, located at both ends of the genome and between the IRL and IRS regions (i.e., a-TRL—UL—IRL—a—IRS—US—TRS-a) (Table 6).
Arch-4: consisting of a unique DNA sequence (i.e. U) without any repeat sequences.
Arch-5: consisting in a unique long region (U) flanked by direct repeat regions (i.e. TR—U—TR) (Table 6).
Arch-6: consisting of terminal repeats (TR) located at either end of the genome, together with internal repeats (IR) interspersed throughout. Unlike the linked repeat arrangement seen in previous genomic architectures, these repeats are not directly linked in pairs. (i.e. TR—[U(n)—IR(n)]n—TR) (Table 6).
Arch7: consisting of two unique regions, UL and US, flanked by the TRL/IRL and TRS/IRS regions and another region named X located between the IRL and the IRS region (i.e. TRL—UL—IRL—X—IRS—US—TRS) (Table 6).
Table 6.
Representation of the six canonical genomic architectures found in herpesviruses
| Name | Genomic structure | Isomers identified | Family |
|---|---|---|---|
| Arch-1 | UL—IRS—US—TRS | US permutation | Alphaherpesvirinae |
| Arch-2 | TRL—UL—IRL—IRS—US—TRS | UL and US permutations | Alphaherpesvirinae, Betaherpesvirinae |
| Arch-3 | a—TRL—UL—IRL—a—IRS—US—TRS—a | UL and US permutations | Alphaherpesvirinae |
| Arch-4 | U | - | Betaherpesvirinae, Alloherpesvirinae |
| Arch-5 | TR—U—TR | - | Gammaherpesvirinae, Betaherpesvirinae, Alloherpesvirinae |
| Arch-6 | TR—[U(n)—IR(n)]n—TR | - | Gammaherpesvirinae |
| Arch-7 | TRL—UL—IRL—X—IRS—US—TRS | UL and US permutations | Malacoherpesvirinae |
Orthoherpesviridae
The genomic architecture of Orthoherpesviridae viruses varies between families and different genera, as well as within the same genus.
Alphaherpesvirinae
Among the 49 herpesviruses species in the subfamily Alphaherpesvirinae, 45 genomes have been well characterized, two have only partial genomes and two have no nucleotide sequences in public databases (https://ictv.global/report/chapter/orthoherpesviridae/orthoherpesviridae/alphaherpesvirinae, consulted on 28/01/2025). Their genome size ranges from 120 kb for the bird herpesvirus Iltovirus psittacidalpha5, more commonly known as Psittacid alpaherpesvirus 5 (PsHV-5) [84], to 204 kb for the bird herpesvirus Mardivirus columbidalpha1, or Columbid Alphaherpesvirus 1 (CoAHV-1, PHV) [59] (Fig. 3B).
Four different genomic architectures have been described in the subfamily Alphaherpesvirinae: 22 alphaherpesviruses of the genera Scatuvirus, Iltovirus, Mardivirus, Simplexvirus and Varicellovirus share the genomic architecture Arch-1 (Table 6), 11 alphaherpesviruses of the genera Mardivirus, Simplexvirus and Varicellovirus share the genomic architecture Arch-2 (Table 6), 11 alphaherpesviruses of the genera Mardivirus and Simplexvirus share the genomic architecture Arch-3 (Table 6) and the Iltovirus psittacidalpha5 (PsHV-5) [84] have the genomic architecture Arch-4 (Table 6) (Fig. 3B).
Betaherpesvirinae
Among the 27 herpesviruses species of the subfamily Betaherpesvirinae, 24 have a complete genome, while three possess only partial genome. Of the 24 herpesviruses with a complete genome, the genomic arrangement of 19 has been characterized. Their size ranges from 128 kb for the swine herpesvirus Roseolovirus suidbeta2, more commonly known as porcine cytomegalovirus (SuBHV2; PCMV) [164], to 241 kb for the primate herpesvirus Cytomegalovirus paninebeta2, more commonly known as chimpanzee cytomegalovirus (PnBHV2, CCMV) [91] (https://ictv.global/report/chapter/orthoherpesviridae/orthoherpesviridae/betaherpesvirinae, consulted on 28/01/2025).
Three distinct genomic architecture have been described in the subfamily Betaherpesvirinae: three betaherpesviruses of the genus Cytomegalovirus share the genomic architecture Arch-2 (Table 6), one herpesvirus of the genus Quwivirus and one herpesvirus of the genus Muromegalovirus share the genomic architecture Arch-4 (Table 6), and 14 viruses of the genera Cytomegalovirus, Muromegalovirus, Proboscivirus, Quwivirus and Roseolovirus share the genomic architecture Arch-5 (Table 6) (Fig. 3B).
Gammaherpesvirinae
Among the 42 herpesvirus species of the subfamily Gammaherpesvirinae, 26 have a complete genome, whereas 16 possess only a partial genome. Of the 26 herpesviruses species with a complete genome, the genomic architecture of 18 viruses has been characterized. The genome size of these viruses ranges from 119 kb for the Rhadinovirus muridgamma4, better known as Murine gammaherpesvirus 68 (MHV68) [132], to 184 kb for the equine herpesvirus Percavirus equidgamma2, better known as equine herpesvirus 2 (EqGHV2, EVH2) [115] (https://ictv.global/report/chapter/orthoherpesviridae/orthoherpesviridae/gammaherpesvirinae, consulted on 28/01/2025).
Two distinct genomic architectures have been described in Gammaherpesvirinae: 10 viruses of the genera Bossavirus, Macavirus, Percavirus and Rhadinovirus share the genomic architecture Arch-5 (Table 6) whereas 8 gammaherpesviruses of the genus Lymphcryptovirus and Patagavirus share the genomic architecture Arch-6 (Table 6) (Fig. 3B).
Malacoherpesviridae
The complete genomes of the three viruses of the family Malacoherpesviridae have been characterized. With sizes ranging from 192 kb for the Babylonia areolate herpesvirus [19] to 212 kb for the Aurivirus haliotidmalaco 1; better known as Abalone herpesvirus 1 [143] (https://ictv.global/report/chapter/malacoherpesviridae/malacoherpesviridae, consulted on 28/01/2025).
These three malacoherpesviruses share the genomic architecture Arch-7 (Table 6) (Fig. 3B).
Alloherpesviridae
The family Alloherpesviridae contains 13 viruses of which 9 have a complete genome available in genomic public database. Among these 9 herpesviruses, the genomic architecture of 8 viruses have been characterized. The genome sizes of these viruses range from 134 kb for the catfish herpesvirus Ictavirus ictaluridallo1, more commonly known as ictalurid herpesvirus 1 (CCV) [147], to 295 kb for the koi herpesvirus Cyvirus cyprinidallo3, or Cyprinid herpesvirus 3 (CyHV3) [151] (https://ictv.global/report/chapter/alloherpesviridae/alloherpesviridae, consuled on 28/01/2025).
Two distinct genomic architecture have been described in the family Alloherpesviridae: the Batravirus ranidallo3, also known as Ranid herpesvirus 3 (RaHV3) [145] and the bufonid herpesvirus 1 (not classified by ICTV yet) [20] share the genomic architecture Arch-4 (Table 6), and the Lake sturgeon herpesvirus 1 (not classified by ICTV yet) [21] has the genomic architecture Arch-2 (Table 6) whereas all viruses with a complete genome of the genera Cyvirus and Ictavirus, the Silurid herpesvirus 1 (not classified by ICTV yet) [22] and two viruses of the genus Batravirus share the genomic architecture Arch-5 (Table 6) (Fig. 3B).
Insights into the role of herpesvirus genomic architecture
Herpesvirus genomes are among the most complex viral genomes [6]. The genomic architecture of these genomes varies between families and genera. However, the majority of herpesviruses have inverted repeat regions making their genomes difficult to characterise. While the genome architecture of known Malacoherpesviridae viruses has been fully characterized, it is still lacking for some viruses of the Alloherpesviridae, Betaherpesvirinae and Gammaherpesvirinae families. Recent advances in long-read sequencing technologies have provided powerful tools for the sequencing and assembly of complex viral genomes, enabling more accurate and comprehensive analyses of genomic structures. For instance, long-read sequencing has allowed resolving the inverted repeat regions of OsHV-1 [165], HSV-2 [166], and EfHV [135], and detecting genomic isomerization events through sequencing [160, 165–167]. Inverted repeat regions are thought to contribute to the formation of genomic isomers within individual viruses, with potential implications for the regulation of the herpesvirus life cycle [168, 169]. Therefore, a better understanding of these genomic architectures is crucial to characterise and understand their impact on the viral life cycle, viral infectivity and adaptation to their host.
Genomic isomerization of Herpesvirales and its phenotypic implications
The genomic architectures described above represent the canonical genomic organisation of the various herpesviruses characterized to date (Tables 1, 2, 3, 4 and 5). However, several large structural variations termed isomers, resulting from the permutation of the unique regions surrounded by repeated and inverted regions (IRL/TRL and IRS/TRS) have been described [32, 49, 86, 165–174]. Several approaches have been used to characterise these viral isomerisations, including restriction endonuclease digestion and southern blot hybridisation [32, 49, 86, 167–173], DNA denaturation and electron microscopy [166], long-range PCR [174] and more recently long-read sequencing [160, 165].
Three genomic architectures (Arch-2, Arch-3, and Arch-7) can lead to four viral isomerisation by the permutation of UL and US in the Alphaherpesvirinae, Betaherpesvirinae and Malacoherpesviridae families (Table 6) [32, 47, 49, 50, 50, 51, 54, 86, 165, 172–176]. In addition, the genomic architecture Arch-1 can lead to two viral isomerisations resulting from the permutation of the US region, specifically in the Alphaherpesvirinae subfamily [45, 51, 57, 83, 168, 170, 171, 177].
Cause and consequence of genome isomerisation of herpesviruses are still not fully understood. However, for HSV-1, one of the herpesviruses whose isomers have been well studied, isomerisation appears to result from homologous recombination between inverted repeat regions during DNA replication [178, 179]. DNA denaturation and electron microscopy allowed characterizing four HSV-1 genome isomers [166]: (i) the P isomer (for prototype), where UL and US are in sense direction; (ii) the IL where UL is inverted; (iii) the IS where US is inverted; and finally (iv) the ILS, involving inversions of both the UL and US regions. These isomers are typically found in equimolar proportions in HSV-1 [180, 181]. Similar isomer proportion patterns have been observed for HSV-2 [165] and for OsHV-1 [32, 160].
Interestingly, for HSV-1, isomer proportions seem to depend on the type of cells infected and the virus strain. Indeed, in HSV-1 KOS strain isolated from the mouse cornea, the proportions of the four isomers are equivalent. In contrast, when the virus is isolated from the trigeminal ganglia of infected mice, a site where HSV-1 establishes latency, the ILS isomer is overrepresented [175].
Although, isomers have been identified and characterised for several herpesvirus families, many other herpesviruses including repeated and inverted genomic regions could also show signs of isomerisations. New long read sequencing methods should facilitate the characterisation of herpesvirus isomerisation. Interestingly, analysis of gene annotations across all complete herpesvirus genomes shows that viral genes do not span isomerization boundaries suggesting that gene integrity is preserved during genomic isomerization events. However, the functional consequences of isomerization remain unclear. Further investigation is needed to determine whether different genomic isomers influence viral replication dynamics or infectivity, and whether the coexistence of multiple isomeric forms within the same host cell is required for productive infection. To date, the biological role of genomic isomers remains largely unknown, particularly with respect to their potential impact on replication fidelity and viral fitness.
Herpesviruses life cycle
The viral cycle of herpesviruses is divided into two main phases: a lytic phase and a persistence phase. During the lytic phase, viral genes are expressed and translated into viral proteins that regulate viral DNA replication, the formation of new capsids and the production of new viral particles shed from infected host cells, allowing the virus to replicate and spread to new hosts [182]. During the persistence phase, the virus remains in the host without being damaged by the host's immune system. In general, two scenarios can occur during this phase: the virus can either establish a balance between its replication rate and the host’s immune response, or it can enter a latent state in which viral replication ceases [183–185]. Although all herpesviruses studied for persistence characterisation enter latency, the persistence phase has not been described for all herpesviruses. In the following sections, we will use the term “persistence” (Fig. 3D) to refer to herpesviruses known to establish persistence but for which latency has not been demonstrated or studied at the molecular level, and “latency” (Fig. 3D) to refer to those with demonstrated latency.
Lytic phase
The lytic phase described in this section provides a general overview of the herpesvirus lytic cycle, primarily based on key steps elucidated in extensively studied human herpesviruses. In contrast, the replication cycles of herpesviruses infecting non-human hosts remain largely uncharacterized. To date, among the 137 herpesvirus species, replication has been studied in only 19 of 49 alphaherpesviruses, 9 of 27 betaherpesviruses, 9 of 42 gammaherpesviruses, 2 of 3 malacoherpesviruses, and 3 of 16 alloherpesviruses. This limited knowledge is largely attributable to the difficulty of working with unculturable viruses, as suitable cell lines are unavailable for most host species.
The lytic phase of herpesviruses generally involves several key steps (Fig. 4). First, viral particles bind to receptors on the surface of host cells, a process mediated by glycoproteins located on the surface of the viral envelope (Fig. 4, step 1). Once receptor binding is complete, herpesviruses enter in the cells via two primary mechanisms: direct fusion of the viral envelope with the cell membrane, or membrane fusion following uptake by endocytosis (Fig. 4, step 2) [8, 186, 187]. Once within the host cell, the capsid along with the viral proteins carried by the envelope are released into the cytoplasm. These envelop proteins facilitate the transport of the capsid to the host cell nucleus. In fact, due to the dense and highly organised structure of the cytoplasm, diffusion alone is not sufficient for capsid movement from the cell surface to the nucleus. Instead, capsids actively use microtubules as a transport pathway by binding to microtubule motors through a series of interactions (Fig. 4, step 4). Finally, capsids dock with the nuclear pore complex and release their DNA which is then translocated into the nucleus [8, 25, 188].
Fig. 4.
Herpesviruses proposed lytic phase. Adapted from [25, 26, 154, 182, 189–194]
Once the viral genome is released into the nucleus, transcription of viral genes begins with the expression of specific viral genes (Fig. 4, step 4). These genes have been classified in three categories depending on the chronology of their expression: (1) immediate-early (IE) or α genes, (2) early (E) or β genes, and (3) late (L) or γ genes [8, 191, 193]. The first genes to be transcribed are the IE genes and code for protein involved in the activation of the transcription of other viral genes [193, 194], RNA splicing [195], and inhibit transcription of host genes [196]. Polypeptides and proteins encoded by E genes are mainly involved in the activation of DNA replication [8, 193], but also in the inhibition of the expression of some IE genes and host cell genes. Finally, late genes are expressed once the genome replication starts [8, 187]. Many of these L genes code for structural proteins involved in virus assembly [8, 25]. At this stage of the infection, the three categories of genes may be expressed simultaneously [25, 26].
DNA replication occurs in the nucleus of infected cells and usually begins when E genes are expressed (Fig. 4, step 5). DNA replication is a two-step process involving initiation by the binding of the origin binding protein to the origin of replication leading to the formation of the replication complex, which replicates the molecule through an intermediate such a theta molecule (Fig. 4, step 5.a) in a process that produces circular progeny DNA molecules. A rolling circle mechanism has been proposed for the second step of DNA synthesis (Fig. 4, step 5b) [8]. This mechanism produces long concatemers of viral genomes (i.e. long DNA molecules consisting of repeated genomes forming a linear multimer), which are cut into genomic units during packaging of the DNA into newly formed capsids [192, 197].
Newly synthesized capsid proteins accumulate in the nucleus to form three types of capsids: C capsids, in which DNA is packaged (Fig. 4, step 6); B capsids, in which viral proteins accumulate; and A capsids which remain empty of DNA or viral proteins and are likely the result of aborted packaging step [25, 26].
The DNA-filled capsids (nucleocapsids) exit the nucleus through a process of envelopment at the inner nuclear membrane forming a primary enveloped particle within the perinuclear space (Fig. 4, step 7.a.). This step is followed by fusion of the primary enveloped particle with the outer nuclear membrane releasing the nucleocapsid without the primary envelop into the cytoplasm with the help of the nuclear egress complex (NEC) (Fig. 4, Step 7.b) [198–201]. The released nucleocapsid then acquires its tegument and mature envelope through different cytoplasmic organelles depending on the herpesvirus species. For example, HCMV tegumentation takes place in the cytoplasmic virion assembly complex (cVAC) [202–204] whereas HSV-1 acquires its tegument from the Golgi apparatus [8]. Tegumented nucleocapsids acquire their mature (secondary) envelope either in the trans-Golgi network for HSV-1, recycling endosomes for HCMV or multivesicular bodies for HHV-6A (Fig. 4, step 7.c) [8, 198, 199]. Vesicles containing enveloped virions are transported to the plasma membrane, where vesicle membrane fuses with the plasma membrane. Mature virions are then released into the extracellular space where they can infect other cells from the same or from different individuals (Fig. 4, step 8) [8, 25, 198, 199].
Persistent phase
The second phase of the herpesvirus life cycle is the persistence phase. Among the 137 recognized herpesvirus species, persistence has been investigated in 28 of 49 alphaherpesviruses, 10 of 27 betaherpesviruses, 17 of 42 gammaherpesviruses, 1 of 3 malacoherpesviruses, and 6 of 13 alloherpesviruses. However, molecular evidence of latency has been demonstrated for only 31 of these 62 species (Fig. 3D) [49, 133, 140, 141, 205–234].
Herpesviruses that have been characterized for persistence primarily persist in two specific tissues within their hosts. Herpesviruses of the family Alphaherpesvirinae establish persistence primarily in the trigeminal ganglion of their hosts (23 herpesviruses species, Fig. 3D) [47, 67, 80, 211, 214, 223, 230, 235–245] (Fig. 3D). However, Galliformes herpesviruses and herpesviruses of the subfamilies Betaherpesvirinae, Gammaherpesvirinae, and of the families Malacoherpesviridae and Alloherpesviridae establish their persistence in the immune system cells of their hosts (28 herpesviruses species, Fig. 3D) [24, 140, 216, 224, 225, 228, 246–248] (in green in Fig. 3D).
Based on a comprehensive literature review of 31 herpesviruses with documented latency at the molecular level, the following sections describe the mechanisms that maintain viral genome and gene expression during latency and the processes that trigger herpesvirus reactivation.
Maintenance of the viral genome during latency
Depending on the host, different mechanisms are required to maintain latency. For herpesviruses that establish latency in dividing cells, these mechanisms must ensure stable retention of the viral genome in the nucleus of infected cells and its transmission to daughter cells during cell division. There is relatively little information in the literature about these mechanisms. To date, two main mechanisms have been described to maintain viral herpes genome in infected cells: the circularisation of the viral genome as episome (10 herpesviruses species, Fig. 3D) or the integration of the viral genome into host DNA (4 herpesviruses species, Fig. 3D).
Episomes formation has been demonstrated for several herpesviruses including human herpesviruses (i.e. HSV-1, HSV-2, Cytomegalovirus humanbeta5 (HCMV), Varicellovirus humanalpha3 (VZV), Lymphocryptovirus humangamma4 (EBV), HHV-6, and Roseolovirus humanbeta7 HHV-7) [24], bovines herpesvirus (Macavirus ovinegamma2, OvGHV-2) [228, 249], bat herpesvirus (Patagivirus vespertilionidgamma3, EfHV) [250], mouse herpesvirus (Rhadinovirus muridgamma4, MHV68) [251] and fish herpesvirus (i.e. Ictavirus ictaluridallo1, IcHV1) [227] (Fig. 3D). After initial infection and virus entry into the trigeminal ganglion or host immune cells, the linear herpesvirus genome becomes circularised by fusion of terminal repeats located at both ends of the genome and is rapidly chromatinised in the nucleus [24, 252–254, 254, 255]. Herpesviruses that establish latency in immune cells capable of division must ensure their persistence during cell replication (Fig. 3D). To achieve this, they synthesize viral proteins that facilitate the attachment of the viral episome to the host chromosome, enabling the transmission of the viral genome to daughter cells. [256] (Fig. 5A).
Fig. 5.
Mechanisms of herpesvirus latency maintenance and reactivation. A Herpesvirus DNA can be maintained in a circular episomal form within hosts cells. In ganglia cells, episome stay free in the cell while in immune cell, the viral episome is tethered to the host chromosome by specific proteins ensuring that viral DNA is passed on during cell division. Stress can lead to reactivation of herpesvirus. B Some herpesviruses can integrate their latent DNA directly into the host cell genome. This integration often occurs in the telomeric regions of the host chromosome, allowing the virus to persist and evade immune detection. A stress or the natural shortening telomeres can lead to reactivation of the herpesvirus genome
Integration into host DNA has been described for MDV, HHV-6 and EBV (Fig. 5B). The process of integration involves the terminal regions of MDV and HHV-6 genomes that contain perfect repeats of the telomeric sequence of their host chromosomes [257–259]. While the precise mechanisms underlying this integration remain unclear, certain viral proteins such as 5’-3’ exonuclease, single-strand DNA binding protein or adeno-associated virus 2 integrase, may facilitate MDV and HHV-6 integration, respectively [260]. In contrast, EBV does not integrate at a single site like MDV and HHV-6; instead, its integration is non-random, occurring predominantly in heterochromatic regions of the host genome, which are rich in repetitive sequences and lack functional genes [261]. By integrating into the host DNA, these herpesviruses ensure the stable maintenance of their genome during cell division.
Regulation of viral genes expression during latency
To evade detection by the host immune system, herpesviruses must tightly regulate the expression of their lytic genes and modulate host genes activity to prevent elimination of the infected cell. This is achieved by three different mechanisms including expression of viral long non-coding RNAs (lncRNA), microRNAs (miRNA) and non-lytic protein-coding genes.
Many herpesviruses express lncRNAs that contribute to the establishment of latency. These transcripts are transcribed antisense to immediate-early genes and induce the regulation of their transcription [24, 231, 262, 263]. lncRNAs are also involved in epigenetic modifications of histones, such as trimethylation and demethylation, leading to the formation of repressive heterochromatin around viral DNA, thereby preventing lytic gene transcription. In addition, these lncRNAs contribute to the inhibition of apoptosis, ensuring the long-term persistence of the viral genome (Fig. 6) [24, 262].
Fig. 6.
Mechanisms of regulation of viral genes expression during latency.LncRNAs, protein-coding genes and miRNAs are expressed during the latency phase and play a role in the maintenance of the latency by modulating histone epigenetics, inhibiting apoptosis of the infected cells, stimulating the cell cycle progression, blocking translation of lytic proteins, regulating viral and host expression and suppressing lytic gene expression
Viral and host miRNAs play an important role in modulating latency [24, 264, 265]. They can contribute to the degradation of lytic mRNA or to the inhibition of lytic protein translation, and to the regulation of host cell genes expression. All these mechanisms lead to the evasion of recognition of latently infected cells by the host immune system, to reduce the expression of immediate-early genes and are also involved in the inhibition of apoptosis [24, 264, 266, 267] (Fig. 6).
Finally, some herpesviruses express protein-coding genes that play also essential roles in maintaining latency. Similar to lncRNAs and miRNAs, these non-lytic proteins are involved in epigenetic modifications of histone, tethering the viral episome to the host chromosome, promoting cell cycle progression, and inhibiting apoptosis. Together, all these processes contribute to the stable persistence of the viral genome inside host cells (Fig. 6) [24, 209, 268].
While these mechanisms ensure the long-term viral latency, herpesviruses have also developed strategies to emerge from this dormant state upon stress activation and when conditions are favourable for viral replication.
Reactivation
The success of herpesviruses is primarily due to their ability to reactivate from a latent state. Viral reactivation can occur spontaneously, but is more likely to occur in response to biotic or abiotic stress of their host. In the case of HSV-1, several stimuli that induce neuronal stress have been shown to trigger viral reactivation in cell culture, including removal or inhibition of neurotrophic factors and exposure to UV light. In humans, triggers include exposure to sunlight, hormonal fluctuations or surgical resection [193, 269–273]. For Varicellovirus felidalpha1 (FVRV) which infects cats, stressors such as environmental changes can lead to viral reactivation [220], while for MDV: Mardivirus gallidalpha2, also known as Marek’s disease virus (MDV), factors such as hypoxia, apoptosis or a decrease of temperature can induce viral reactivation in cell culture [24, 251, 274] (Fig. 5A). For herpesviruses that integrate inside telomeres of their host chromosome, viral reactivation could also be induced by the natural shortening of the telomeres that could either relieve suppression of viral gene transcription or inducing telomere-telomere recombination, resulting in release of the virus genome from the integration site (Fig. 5B) [260].
The mechanisms of herpesviruses reactivation are not fully understood. Based on the work done on HSV-1 and murine neurons, the reactivation can be divided in two phases. The first one, called “animation”, involves decrease of lncRNAs and miRNAs expression, transcription from the silenced DNA that does not follow the same well-ordered process of gene transcription that occurs during the lytic phase [193, 253, 263, 275, 276]. Once some viral proteins are translated, the second reactivation phase starts, classical cascade of virus gene expression occurs (see Lytic Phase), progeny virions are assembled and transported to axon termini to be released in epithelial cells in the mucosa or skin resulting in disease [24, 193, 276].
Perspectives and insights into herpesvirus life cycle comprehension
For most herpesvirus species (95 out of 137), the lytic phase has not yet been described at the transcriptomic level. This is likely due to the high transcriptional complexity of herpesviruses [277], as well as challenges in developing suitable models to study them and/or difficulties in inducing the lytic phase in some species [278]. Latency has been demonstrated in 31 of the 137 known herpesvirus species but it is likely that other herpesviruses also have the ability to establish latency in their hosts. With the exception of the Malacoherpesviridae family, all herpesvirus families contain at least one species for which latency has been demonstrated at the molecular level, supporting the hypothesis that latency is a common feature of the persistent phase. Indeed, aquatic herpesviruses become undetectable at low water temperatures in winter and reactivate in summer when temperatures rise, suggesting the presence of a latency phase [279].
Recent advances in sequencing and imagery technologies, such as single-cell genomics and transcriptomics, spatial transcriptomic and multi-omics approaches, allow studying viral gene expression alongside the host cell immune response, providing a more comprehensive view of the viral development in different tissues or even in different cell types [280, 281]. Long-read sequencing technologies enable the characterization of full-length viral transcripts and the identification of polycistronic RNAs [282, 283]. Moreover, the study of epigenetic modifications [284–287] could also provide new insights into the life cycle of herpesvirus. This may not only help to characterize the production of new virions at the transcriptomic level, but also to identify non-coding viral transcripts that may support latency.
In addition, many viral genes have not yet been fully functionally annotated, and their true coding potential is still poorly understood. Transcriptomics coupled with proteomics analyses could overcome these limits [283, 288]. Furthermore, machine learning tools such as AlphaFold [289] and DeepLoc (https://services.healthtech.dtu.dk/services/DeepLoc-2.1/) could be used to investigate virus-host protein interactions as well as to predict the localization of the protein in the host cell.
These recent advances in sequencing technologies and bioinformatics tools should significantly improve our knowledge of herpesvirus biology in the coming years.
Conclusion
This review offers an overview on the available information on systematics, genomic architecture and life cycle of herpesviruses. Herpesviruses are large and complex double-stranded DNA viruses, characterized by a capsid that encloses tightly packed DNA, surrounded by a protein-rich tegument and an outer envelope. They have a complex, family-specific genomic architecture that can be divided into seven groups. For almost all herpesviruses, the genomic architecture includes inverted repeat regions, that lead to the formation of isomers that coexist in equimolar proportions within host cells. The function of these isomers remains poorly understood, probably due to the challenges of their characterization.
To date, 137 herpesviruses species have been described, but many more, particularly within the Malacoherpesviridae and Alloherpesviridae families, are likely to remain undiscovered. Advances in database analysis, long-read sequencing and purification methods may help facilitate their characterization.
The life cycle of human-infecting herpesviruses is well documented, showing a sequential expression of three categories of genes required for the assembly of new viral particles. In contrast, the replication cycles of non-human herpesviruses remain poorly understood largely due to the lack of suitable cell lines for many non-human species, making in vitro studies difficult. Similar limitations apply to the study of latency at the molecular level. Although several long non-coding RNAs (lncRNAs) and microRNAs (miRNAs) involved in maintaining the viral genome during latency, either integrated or circularized as an episome, have been identified in human herpesviruses, much less is known about these processes in other hosts. This knowledge gap is particularly evident for members of the families Gammaherpesviridae, Malacoherpesviridae, and Alloherpesviridae.
Improving our understanding of the genomic architecture, isomeric configurations and life cycles of herpesviruses, especially those that infect non-human hosts, will be crucial to fill current knowledge gaps. Recent breakthroughs in genomics, transcriptomics, proteomics and imaging now provide the tools to explore these aspects in greater depth and unravel the complex biology and evolutionary dynamics of these viruses, ultimately helping to develop strategies to prevent reactivation and associated disease.
Acknowledgements
Not applicable.
Abbreviations
- AbHV-1
Aurivirus haliotidmalaco1
- BaHV
Babylonia areolate Herpesvirus
- CCV
Ictavirus ictaluridallo1
- CoAHV-1, PHV
Mardivirus columbidalpha1
- cVAC
Cytoplasmic Virion Assembly complex
- CyHV3
Cyvirus cyprinidallo3
- dsDNA
Double-stranded DNA
- dsRNA
Double-stranded RNA
- E
Early
- EBV
Lymphocryptovirus humangamma4
- EfHV
Patagivirus vespertilionidgamma3
- EqGHV2, EHV2
Percavirus equidgamma2
- FRV
Varicellovirus felidalpha1
- HCMV
Cytomegalovirus humanbeta5
- HHV-6A
Roseolovirus humanbeta6
- HHV-7
Roseolovirus humanbeta7
- HSV-1
Simplexvirus humanalpha1
- HSV-2
Simplexvirus humanalpha2
- IcHV1
Ictavirus ictaluridallo1
- ICTV
International Committee on Taxonomy of Viruses
- IE
Immediate-early
- IR
Internal Repeat
- IRL
Internal Repeat Long
- IRS
Internal Repeat Short
- L
Late
- lncRNA
Long non-coding RNA
- MDV
Mardivirus gallidalpha2
- MHV68
Rhadinovirus muridgamma4
- miRNA
Micro RNA
- NEC
Nuclear Egress Complex
- NGS
Next Generation Sequencing
- OcGHV2
Macavirus ovinegamma2
- OsHV-1
Ostreavirus ostreidmalaco1
- PnBHV2, CCMV
Cytomegalovirus paninebeta2
- PsHV-5
Iltovirus psittacidalpha5
- RaHV3
Batravirus ranidallo3
- ssDNA
Single-stranded DNA
- ssRNA
Single-stranded RNA
- SuBHV2, PMCV
Roseolovirus suidbeta2
- TR
Terminal Repeat
- TRL
Terminal Repeat Long
- TRS
Terminal Repeat Short
- UL
Unique Long
- US
Unique Short
- VZV
Varicellovirus humanalpha3
Authors’ contributions
ADM drafted the manuscript and GC, BM and IA corrected it. All authors read and approved the final version of the manuscript.
Funding
ADM, GC, BM and IA were financially supported by Ifremer.
Data availability
No datasets were generated or analysed during the current study.
Declarations
Ethics approval and consent to participate
Not applicable.
Consent for publication
Not applicable.
Competing interests
The authors declare no competing interests.
Footnotes
Publisher’s Note
Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Contributor Information
Aurélie Dotto-Maurel, Email: aurelie.dotto.maurel@ifremer.fr.
Germain Chevignon, Email: germain.chevignon@ifremer.fr.
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Associated Data
This section collects any data citations, data availability statements, or supplementary materials included in this article.
Data Availability Statement
No datasets were generated or analysed during the current study.





