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. 2023 Dec 20;8:578. [Version 1] doi: 10.12688/wellcomeopenres.20499.1

The genome sequence of Ashworth’s Rustic, Xestia ashworthii (Doubleday, 1855)

John F Mulley 1, David C Lees 2; Natural History Museum Genome Acquisition Lab; Darwin Tree of Life Barcoding collective; Wellcome Sanger Institute Tree of Life Management, Samples and Laboratory team; Wellcome Sanger Institute Scientific Operations: Sequencing Operations; Wellcome Sanger Institute Tree of Life Core Informatics team; Tree of Life Core Informatics collective; Darwin Tree of Life Consortiuma
PMCID: PMC11327654  PMID: 39157737

Abstract

We present a genome assembly from an individual male Xestia ashworthii (Ashworth’s Rustic; Arthropoda; Insecta; Lepidoptera; Noctuidae). The genome sequence is 726.3 megabases in span. Most of the assembly is scaffolded into 31 chromosomal pseudomolecules, including the z sex chromosome. The mitochondrial genome has also been assembled and is 15.39 kilobases in length.

Keywords: Xestia ashworthii, Ashworth’s Rustic, genome sequence, chromosomal, Lepidoptera

Species taxonomy

Eukaryota; Metazoa; Eumetazoa; Bilateria; Protostomia; Ecdysozoa; Panarthropoda; Arthropoda; Mandibulata; Pancrustacea; Hexapoda; Insecta; Dicondylia; Pterygota; Neoptera; Endopterygota; Amphiesmenoptera; Lepidoptera; Glossata; Neolepidoptera; Heteroneura; Ditrysia; Obtectomera; Noctuoidea; Noctuidae; Noctuinae; Noctuini; Xestia; Xestia ashworthii ( Doubleday, 1855) (NCBI:txid988043).

Background

Ashworth’s Rustic, Xestia ashworthii ( Doubleday, 1855) is a medium-sized (16–20 mm forewing length: Waring et al., 2017) noctuid, that Henry Doubleday based on a specimen collected at Llangollen in Denbighshire in 1853 by Joseph Ashworth. In the UK at least, the forewing ground colour is ashy to dark grey with darker grey cross markings, the post reniform one narrow and very jagged.

Ashworth’s Rustic is found only in Wales in the UK, and more specifically areas of north and west Wales ( NBN Atlas Partnership, 2023; Randle et al., 2019). It was found in Anglesey in 1994 ( Waring et al., 2017). In Europe also, it is associated with mountainous regions and areas of exposed rock and scree slopes, ranging from the Pyrenees, Eastern Europe, Southern Scandinavia, and sparsely distributed from Italy, Greece, and eastwards in Asia to Lake Baikal ( GBIF Secretariat, 2023).

In Wales there are relatively few records of Ashworth’s Rustic annually due to low sampling intensity. However, where concerted efforts have been made, the species has been found to be locally abundant ( Morgan, 1974). Randle et al. (2019) were unable to characterise distribution and abundance changes due to under-recording. The species was classified as nationally rare in 2019 review of the status of the macro-moths of Great Britain ( Fox et al., 2019) or Nationally Scarce A ( Waring et al., 2017). It is also a priority species on the UK Biodiversity Action Plan ( BRIG, 2007).

Biological details owe much to Tait (1923), Crewdson (1964), and Morgan (1974). Adults fly in the UK from end of June and into early August with a peak in mid-July ( Randle et al., 2019).

Eggs are initially white and then turn brown over a few days, and are laid in batches on various plants, including grass stems and exposed heather roots. Heath Bedstraw ( Galium saxatile) and heathers seem to be the most important foodplants ( Bretherton et al., 1983: 182 characterise them as polyphagous). The looping small larvae overwinter from autumn, and can be found feeding again from February onwards, with large caterpillars, 4 cm fully fed, grey, with a large wedge-shaped black marking bilaterally on each segment, often found in April and May apparently basking on exposed rocks or near the top of vegetation. Pupae have been recovered from cracks and crevices in rocks, and from shallow chambers under the soil, where they form a flimsy cocoon ( Bretherton et al., 1983: 182).

Tait (1923) reported that the previously easily-accessible and apparently healthy populations around Penmaenmawr and the Sychnant Pass suffered greatly from attack by a still unidentified ichneumonid wasp around 1917–18. A nationally notable tachinid fly, Drino lota (Meigen, 1824) has been reported as a parasitoid of X. ashworthii ( Smith, 1989: 124).

The continental populations have been classified into a number of subspecies, including Xestia ashworthii artvina (de Freina & Hacker, 1985); Xestia a. candelarum (Staudinger, 1871); Xestia a. centralaltaica (Volynkin & Dvorak, 2016); Xestia a. jotunensis (Schoyen, 1887); and Xestia a. lactescens (Turati, 1919). The Welsh subspecies of Ashworth’s Rustic ( Xestia ashworthii ashworthii) most likely represents a glacial relic ( Jiménez-Alfaro et al., 2016). It belongs to the cluster on BOLD (BIN), BOLD:ABY8432. The mitochondrial genome sequence (OX465578.1, for NHMUK014425722) is, at least, one nucleotide divergent (0.15% for 658 bp) to most specimens of the last cluster, a few of which identified as X. x. candelarum, A DNA barcode from the same specimen (BOLD Process ID DTNHM5433-23) conflicts by one nucleotide (is at least 0.31% divergent to others). The mitochondrial genome sequence for NHMUK014425722 is most closely related (at 1.98-2.16% divergence for 658 bp) to Xestia wockei (Möschler, 1862) from Russia and X. scropulana (Morrison, 1874) in Canada both species belonging to BIN BOLD:ABY8431, and the latter taxon possibly representing a synonym of the former.

The recent finding that cool-adapted moths in Great Britain are increasingly shifting their range to the north-west ( Hordley et al., 2023) raises significant issues for Ashworth’s Rustics, as there is limited habitat available to expand into in north Wales before they meet the Irish Sea, and even elevational shifts as seen in mountain butterflies ( Rödder et al., 2021) can only occur for so long before they reach the peak.

This genome sequence will not only be an invaluable resource for determination of levels of genetic differentiation within and between the subspecies, and their relationships, also to other Xestia, but will be of great help in developing genetic markers to assess levels of genetic diversity and patterns of gene flow within the Welsh and continental populations, and for detecting differential patterns of selection and evolutionary trajectories across their range.

Genome sequence report

The genome was sequenced from one male Xestia ashworthii ( Figure 1) collected from Llanfihangel-y-Pennant, Wales (52.67, –3.96). A total of 29-fold coverage in Pacific Biosciences single-molecule HiFi long reads was generated. Primary assembly contigs were scaffolded with chromosome conformation Hi-C data. Manual assembly curation corrected 5 missing joins or mis-joins and removed 7 haplotypic duplications, reducing the assembly length by 0.42% and the scaffold number by 6.67%.

Figure 1. Photograph of the Xestia ashworthii (ilXesAshw1) specimen used for genome sequencing.

Figure 1.

The final assembly has a total length of 726.3 Mb in 69 sequence scaffolds with a scaffold N50 of 25.1 Mb ( Table 1). The snailplot in Figure 2 provides a summary of the assembly statistics, while the distribution of assembly scaffolds on GC proportion and coverage is shown in Figure 3. The cumulative assembly plot in Figure 4 shows curves for subsets of scaffolds assigned to different phyla. Most (99.55%) of the assembly sequence was assigned to 31 chromosomal-level scaffolds, representing 30 autosomes and the Z sex chromosome. Chromosome-scale scaffolds confirmed by the Hi-C data are named in order of size ( Figure 5; Table 2). While not fully phased, the assembly deposited is of one haplotype. Contigs corresponding to the second haplotype have also been deposited. The mitochondrial genome was also assembled and can be found as a contig within the multifasta file of the genome submission.

Figure 2. Genome assembly of Xestia ashworthii, ilXesAshw1.1: metrics.

Figure 2.

The BlobToolKit Snailplot shows N50 metrics and BUSCO gene completeness. The main plot is divided into 1,000 size-ordered bins around the circumference with each bin representing 0.1% of the 726,328,142 bp assembly. The distribution of scaffold lengths is shown in dark grey with the plot radius scaled to the longest scaffold present in the assembly (42,390,235 bp, shown in red). Orange and pale-orange arcs show the N50 and N90 scaffold lengths (25,131,726 and 16,416,265 bp), respectively. The pale grey spiral shows the cumulative scaffold count on a log scale with white scale lines showing successive orders of magnitude. The blue and pale-blue area around the outside of the plot shows the distribution of GC, AT and N percentages in the same bins as the inner plot. A summary of complete, fragmented, duplicated and missing BUSCO genes in the lepidoptera_odb10 set is shown in the top right. An interactive version of this figure is available at https://blobtoolkit.genomehubs.org/view/Xestia%20ashworthii/dataset/ilXesAshw1_1/snail.

Figure 3. Genome assembly of Xestia ashworthii, ilXesAshw1.1: BlobToolKit GC-coverage plot.

Figure 3.

Scaffolds are coloured by phylum. Circles are sized in proportion to scaffold length. Histograms show the distribution of scaffold length sum along each axis. An interactive version of this figure is available at https://blobtoolkit.genomehubs.org/view/Xestia%20ashworthii/dataset/ilXesAshw1_1/blob.

Figure 4. Genome assembly of Xestia ashworthii, ilXesAshw1.1: BlobToolKit cumulative sequence plot.

Figure 4.

The grey line shows cumulative length for all scaffolds. Coloured lines show cumulative lengths of scaffolds assigned to each phylum using the buscogenes taxrule. An interactive version of this figure is available at https://blobtoolkit.genomehubs.org/view/Xestia%20ashworthii/dataset/ilXesAshw1_1/cumulative.

Figure 5. Genome assembly of Xestia ashworthii, ilXesAshw1.1: Hi-C contact map of the ilXesAshw1.1 assembly, visualised using HiGlass.

Figure 5.

Chromosomes are shown in order of size from left to right and top to bottom. An interactive version of this figure may be viewed at https://genome-note-higlass.tol.sanger.ac.uk/l/?d=LKUwmbHETYaIrDZ4kLlArw.

Table 1. Genome data for Xestia ashworthii, ilXesAshw1.1.

Project accession data
Assembly identifier ilXesAshw1.1
Species Xestia ashworthii
Specimen ilXesAshw1
NCBI taxonomy ID 988043
BioProject PRJEB60829
BioSample ID SAMEA111458702
Isolate information ilXesAshw1, male: head and thorax (DNA sequencing and
Hi-C data), abdomen (RNA sequencing)
Assembly metrics * Benchmark
Consensus quality (QV) 64 ≥ 50
k-mer completeness 100% ≥ 95%
BUSCO ** C:99.0%[S:98.4%,D:0.6%],
F:0.2%,M:0.9%,n:5,286
C ≥ 95%
Percentage of assembly mapped
to chromosomes
99.55% ≥ 95%
Sex chromosomes Z chromosome localised homologous pairs
Organelles Mitochondrial genome
assembled
complete single alleles
Raw data accessions
PacificBiosciences SEQUEL II ERR11147973
Hi-C Illumina ERR11156558
PolyA RNA-Seq Illumina ERR12035184
Genome assembly
Assembly accession GCA_950022955.1
Accession of alternate haplotype GCA_950022645.1
Span (Mb) 726.3
Number of contigs 191
Contig N50 length (Mb) 8.0
Number of scaffolds 69
Scaffold N50 length (Mb) 25.1
Longest scaffold (Mb) 42.4

* Assembly metric benchmarks are adapted from column VGP-2020 of “Table 1: Proposed standards and metrics for defining genome assembly quality” from ( Rhie et al., 2021).

** BUSCO scores based on the lepidoptera_odb10 BUSCO set using v5.3.2. C = complete [S = single copy, D = duplicated], F = fragmented, M = missing, n = number of orthologues in comparison. A full set of BUSCO scores is available at https://blobtoolkit.genomehubs.org/view/Xestia%20ashworthii/dataset/ilXesAshw1_1/busco.

Table 2. Chromosomal pseudomolecules in the genome assembly of Xestia ashworthii, ilXesAshw1.

INSDC
accession
Chromosome Length (Mb) GC%
OX465548.1 1 28.54 38.5
OX465549.1 2 28.41 38.5
OX465550.1 3 28.21 38.5
OX465551.1 4 26.89 38.5
OX465552.1 5 26.36 38.5
OX465553.1 6 26.11 38.5
OX465554.1 7 26.01 38.0
OX465555.1 8 25.95 38.0
OX465556.1 9 25.64 38.5
OX465557.1 10 25.46 38.0
OX465558.1 11 25.28 38.5
OX465559.1 12 25.14 38.5
OX465560.1 13 25.13 38.5
OX465561.1 14 24.75 38.5
OX465562.1 15 24.67 38.5
OX465563.1 16 24.2 38.5
OX465564.1 17 23.49 38.5
OX465565.1 18 23.31 38.5
OX465566.1 19 23.26 38.5
OX465567.1 20 22.55 38.5
OX465568.1 21 21.65 39.0
OX465569.1 22 20.93 38.5
OX465570.1 23 20.82 38.5
OX465571.1 24 20.65 38.5
OX465572.1 25 16.8 39.0
OX465573.1 26 16.42 38.5
OX465574.1 27 14.34 39.0
OX465575.1 28 13.66 39.0
OX465576.1 29 13.3 39.5
OX465577.1 30 12.81 40.0
OX465547.1 Z 42.39 38.0
OX465578.1 MT 0.02 19.0

The estimated Quality Value (QV) of the final assembly is 64 with k-mer completeness of 100%, and the assembly has a BUSCO v5.3.2 completeness of 99.0% (single = 98.4%, duplicated = 0.6%), using the lepidoptera_odb10 reference set ( n = 5,286).

Metadata for specimens, barcode results, spectra estimates, sequencing runs, contaminants and pre-curation assembly statistics are given at https://links.tol.sanger.ac.uk/species/988043.

Methods

Sample acquisition and nucleic acid extraction

A male Xestia ashworthii (specimen ID NHMUK014425722, ToLID ilXesAshw1) was collected from Llanfihangel-y-Pennant, Wales, UK (latitude 52.67, longitude –3.96) on 2021-08-01, using a light trap. The specimen was collected and identified by David Lees (Natural History Museum) and preserved by dry freezing at –80 °C.

High molecular weight (HMW) DNA was extracted at the Tree of Life laboratory, Wellcome Sanger Institute (WSI), following a sequence of core procedures: sample preparation; sample homogenisation; HMW DNA extraction; DNA fragmentation; and DNA clean-up. The ilXesAshw1 sample was weighed and dissected on dry ice (as per the protocol https://dx.doi.org/10.17504/protocols.io.x54v9prmqg3e/v1). The head and thorax of the ilXesAshw1 sample was homogenised using a Nippi Powermasher fitted with a BioMasher pestle, following the protocol at https://dx.doi.org/10.17504/protocols.io.5qpvo3r19v4o/v1. DNA was extracted by means of the HMW DNA Extraction: Automated MagAttract protocol ( https://dx.doi.org/10.17504/protocols.io.kxygx3y4dg8j/v1). HMW DNA was sheared into an average fragment size of 12–20 kb in a Megaruptor 3 system with speed setting 30, following the HMW DNA Fragmentation: Diagenode Megaruptor ®3 for PacBio HiFi protocol ( https://dx.doi.org/10.17504/protocols.io.8epv5x2zjg1b/v1). Sheared DNA was purified using solid-phase reversible immobilisation (SPRI) (protocol at https://dx.doi.org/10.17504/protocols.io.kxygx3y1dg8j/v1). In brief, the method employs a 1.8X ratio of AMPure PB beads to sample to eliminate shorter fragments and concentrate the DNA. The concentration of the sheared and purified DNA was assessed using a Nanodrop spectrophotometer and Qubit Fluorometer and Qubit dsDNA High Sensitivity Assay kit. Fragment size distribution was evaluated by running the sample on the FemtoPulse system.

RNA was extracted from abdomen tissue of ilXesAshw1 using the Automated MagMax™ mirVana protocol ( https://dx.doi.org/10.17504/protocols.io.6qpvr36n3vmk/v1). The RNA concentration was assessed using a Nanodrop spectrophotometer and Qubit Fluorometer using the Qubit RNA Broad-Range (BR) Assay kit. Analysis of the integrity of the RNA was done using the Agilent RNA 6000 Pico Kit and Eukaryotic Total RNA assay.

All wet lab protocols developed by the Tree of Life laboratory are publicly available on protocols.io: https://dx.doi.org/10.17504/protocols.io.8epv5xxy6g1b/v1.

Sequencing

Pacific Biosciences HiFi circular consensus DNA sequencing libraries were constructed according to the manufacturers’ instructions. Poly(A) RNA-Seq libraries were constructed using the NEB Ultra II RNA Library Prep kit. DNA and RNA sequencing was performed by the Scientific Operations core at the WSI on Pacific Biosciences SEQUEL II (HiFi) and Illumina NovaSeq 6000 (RNA-Seq) instruments. Hi-C data were also generated from remaining head and thorax tissue of ilXesAshw1 using the Arima2 kit and sequenced on the Illumina NovaSeq 6000 instrument.

Genome assembly, curation and evaluation

Assembly was carried out with Hifiasm ( Cheng et al., 2021) and haplotypic duplication was identified and removed with purge_dups ( Guan et al., 2020). The assembly was then scaffolded with Hi-C data ( Rao et al., 2014) using YaHS ( Zhou et al., 2023). The assembly was checked for contamination and corrected as described previously ( Howe et al., 2021). Manual curation was performed using HiGlass ( Kerpedjiev et al., 2018) and Pretext ( Harry, 2022). The mitochondrial genome was assembled using MitoHiFi ( Uliano-Silva et al., 2023), which runs MitoFinder ( Allio et al., 2020) or MITOS ( Bernt et al., 2013) and uses these annotations to select the final mitochondrial contig and to ensure the general quality of the sequence.

A Hi-C map for the final assembly was produced using bwa-mem2 ( Vasimuddin et al., 2019) in the Cooler file format ( Abdennur & Mirny, 2020). To assess the assembly metrics, the k-mer completeness and QV consensus quality values were calculated in Merqury ( Rhie et al., 2020). This work was done using Nextflow ( Di Tommaso et al., 2017) DSL2 pipelines “sanger-tol/readmapping” ( Surana et al., 2023a) and “sanger-tol/genomenote” ( Surana et al., 2023b). The genome was analysed within the BlobToolKit environment ( Challis et al., 2020) and BUSCO scores ( Manni et al., 2021; Simão et al., 2015) were calculated.

Table 3 contains a list of relevant software tool versions and sources.

Table 3. Software tools: versions and sources.

Wellcome Sanger Institute – Legal and Governance

The materials that have contributed to this genome note have been supplied by a Darwin Tree of Life Partner. The submission of materials by a Darwin Tree of Life Partner is subject to the ‘Darwin Tree of Life Project Sampling Code of Practice’, which can be found in full on the Darwin Tree of Life website here. By agreeing with and signing up to the Sampling Code of Practice, the Darwin Tree of Life Partner agrees they will meet the legal and ethical requirements and standards set out within this document in respect of all samples acquired for, and supplied to, the Darwin Tree of Life Project.

Further, the Wellcome Sanger Institute employs a process whereby due diligence is carried out proportionate to the nature of the materials themselves, and the circumstances under which they have been/are to be collected and provided for use. The purpose of this is to address and mitigate any potential legal and/or ethical implications of receipt and use of the materials as part of the research project, and to ensure that in doing so we align with best practice wherever possible. The overarching areas of consideration are:

•   Ethical review of provenance and sourcing of the material

•   Legality of collection, transfer and use (national and international)

Each transfer of samples is further undertaken according to a Research Collaboration Agreement or Material Transfer Agreement entered into by the Darwin Tree of Life Partner, Genome Research Limited (operating as the Wellcome Sanger Institute), and in some circumstances other Darwin Tree of Life collaborators.

Funding Statement

This work was supported by Wellcome through core funding to the Wellcome Sanger Institute (206194) and the Darwin Tree of Life Discretionary Award (218328).

The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

[version 1; peer review: 2 approved, 2 approved with reservations]

Data availability

European Nucleotide Archive: Xestia ashworthii. Accession number PRJEB60829; https://identifiers.org/ena.embl/PRJEB60829 ( Wellcome Sanger Institute, 2023). The genome sequence is released openly for reuse. The Xestia ashworthii genome sequencing initiative is part of the Darwin Tree of Life (DToL) project. All raw sequence data and the assembly have been deposited in INSDC databases. The genome will be annotated using available RNA-Seq data and presented through the Ensembl pipeline at the European Bioinformatics Institute. Raw data and assembly accession identifiers are reported in Table 1.

Author information

Members of the Natural History Museum Genome Acquisition Lab are listed here: https://doi.org/10.5281/zenodo.7139035.

Members of the Darwin Tree of Life Barcoding collective are listed here: https://doi.org/10.5281/zenodo.4893703.

Members of the Wellcome Sanger Institute Tree of Life Management, Samples and Laboratory team are listed here: https://doi.org/10.5281/zenodo.10066175.

Members of Wellcome Sanger Institute Scientific Operations: Sequencing Operations are listed here: https://doi.org/10.5281/zenodo.10043364.

Members of the Wellcome Sanger Institute Tree of Life Core Informatics team are listed here: https://doi.org/10.5281/zenodo.10066637.

Members of the Tree of Life Core Informatics collective are listed here: https://doi.org/10.5281/zenodo.5013541.

Members of the Darwin Tree of Life Consortium are listed here: https://doi.org/10.5281/zenodo.4783558.

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Wellcome Open Res. 2024 Aug 29. doi: 10.21956/wellcomeopenres.22692.r85023

Reviewer response for version 1

Kritika Garg 1

The authors describe the genome of Ashworth's Rustic moth. Details of the genome sequencing and the genome are described well. This genome is an important addition to the growing list of Lepidopteran genomes.

As RNA sequencing was done, the authors can also provide details of the transcriptome data and use it for predicting the proteome.

Are sufficient details of methods and materials provided to allow replication by others?

Yes

Is the rationale for creating the dataset(s) clearly described?

Yes

Are the datasets clearly presented in a useable and accessible format?

Yes

Are the protocols appropriate and is the work technically sound?

Yes

Reviewer Expertise:

Compartive genomics, population genomics, conservation

I confirm that I have read this submission and believe that I have an appropriate level of expertise to confirm that it is of an acceptable scientific standard, however I have significant reservations, as outlined above.

Wellcome Open Res. 2024 Aug 15. doi: 10.21956/wellcomeopenres.22692.r91594

Reviewer response for version 1

Sivasankaran Kuppusamy 1

Comments on the manuscript:

  • The first sentence of background can be modified as “Ashworth’s Rustic Xestia ashworthii (Doubleday, 1855) is a medium-sized (wingspan 16-20 mm) noctuid moth (Waring et al., 2017)”. “that Henry Doubleday based on a specimen…………………..” can be removed. Not necessary to give the details here.

  • The second paragraph can be modified as “ X. ashworthii is found only Wales in the UK…………………………..”

  • The sentence can be modified as “The species was also observed in Anglesey in 1994 (Waring et al., 2017)”.

  • Common name of the species may not be used instead of scientific name. Authors have used common name of the species in many places. The species name can be included in the first sentence of the third paragraph. “In Wales there are relatively few records of X. ashworthii annually………………………………..”

  • Fifth paragraph second sentence within the parenthesis “182 characterise them as polyphagous”.  Is it necessary to give here? Otherwise, details of the polyphagous can be given in separate sentence elaborately. There is little confusion here.

  • In the genome sequence report the first sentence can be modified as “The genome was sequenced from a male X. ashworthii……”

  • In the Methods, First paragraph first sentence can be rewritten as “The genus name can be given in short form like X. ashworthii……………………”

  • Protein-coding genes and gene transcripts details aren’t given in the article.

  • Authors have used standard laboratory protocol for DNA isolation. Software and techniques were for the annotations and assembly of the sequences. 

Above all, I confirm that the manuscript meets the necessary scientific standard and is suitable for indexing.

Are sufficient details of methods and materials provided to allow replication by others?

Partly

Is the rationale for creating the dataset(s) clearly described?

Yes

Are the datasets clearly presented in a useable and accessible format?

Yes

Are the protocols appropriate and is the work technically sound?

Yes

Reviewer Expertise:

Phylogenetic Analysis of Noctuoidea moths

I confirm that I have read this submission and believe that I have an appropriate level of expertise to confirm that it is of an acceptable scientific standard.

Wellcome Open Res. 2024 Aug 9. doi: 10.21956/wellcomeopenres.22692.r91598

Reviewer response for version 1

Axel Künstner 1

The authors present the genome assembly of Xestia ashworthii (Ashworth’s Rustic), a medium-sized noctuid with ZW sex chromosomes. The manuscript is well written and focuses on the genome assembly of the homogametic sex (male). The reported total length of the assembled genome is 726.3Mb in 69 scaffolds, which were assigned to 30 autosomes and the Z chromosome.

The methods used are sound, software resources used are well described, and the data is available via the European Nucleotide Archive.

Are sufficient details of methods and materials provided to allow replication by others?

Yes

Is the rationale for creating the dataset(s) clearly described?

Yes

Are the datasets clearly presented in a useable and accessible format?

Yes

Are the protocols appropriate and is the work technically sound?

Yes

Reviewer Expertise:

Cancer genomics, Microbiome, Bioinformatics, Computational Biology

I confirm that I have read this submission and believe that I have an appropriate level of expertise to confirm that it is of an acceptable scientific standard.

Wellcome Open Res. 2024 May 11. doi: 10.21956/wellcomeopenres.22692.r75003

Reviewer response for version 1

Josephine Paris 1

In this report, the assembled genome of Xestia ashworthii is presented. The Introduction provides a nice and very detailed background on the species and its distribution. I only stumbled upon one part, which reads, "Heath Bedstraw ( Galium saxatile) and heathers seem to be the most important foodplants ( Bretherton  et al., 1983: 182 characterise them as polyphagous" It would be nice to know what the 182 refers to, as currently it is unclear to me. The assembly was performed to a good standard using Pacbio Hifi data and scaffolded with Hi-C data. Assembly contiguity and completeness are well demonstrated. It would be nice to include the amount (in Gb) of Pacbio Hifi (not only the coverage) and Hi-C data that was generated. The datasets are clearly available via the links provided.

Are sufficient details of methods and materials provided to allow replication by others?

Yes

Is the rationale for creating the dataset(s) clearly described?

Yes

Are the datasets clearly presented in a useable and accessible format?

Yes

Are the protocols appropriate and is the work technically sound?

Yes

Reviewer Expertise:

Population genomics, genome assembly and annotation

I confirm that I have read this submission and believe that I have an appropriate level of expertise to confirm that it is of an acceptable scientific standard, however I have significant reservations, as outlined above.

Associated Data

    This section collects any data citations, data availability statements, or supplementary materials included in this article.

    Data Citations

    1. Wellcome Sanger Institute: The genome sequence of Ashworth’s Rustic, Xestia ashworthii (Doubleday, 1855). European Nucleotide Archive.[dataset], accession number PRJEB60829,2023. [DOI] [PMC free article] [PubMed]

    Data Availability Statement

    European Nucleotide Archive: Xestia ashworthii. Accession number PRJEB60829; https://identifiers.org/ena.embl/PRJEB60829 ( Wellcome Sanger Institute, 2023). The genome sequence is released openly for reuse. The Xestia ashworthii genome sequencing initiative is part of the Darwin Tree of Life (DToL) project. All raw sequence data and the assembly have been deposited in INSDC databases. The genome will be annotated using available RNA-Seq data and presented through the Ensembl pipeline at the European Bioinformatics Institute. Raw data and assembly accession identifiers are reported in Table 1.


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