Abstract
We present a genome assembly from an individual Alentia gelatinosa (Gelatinous Scale Worm); Annelida; Polychaeta; Phyllodocida; Polynoidae). The genome sequence is 1,237.5 megabases in span. Most of the assembly is scaffolded into 15 chromosomal pseudomolecules. The mitochondrial genome has also been assembled and is 15.37 kilobases in length.
Keywords: Alentia gelatinosa, Gelatinous Scale Worm, genome sequence, chromosomal, Phyllodocida
Species taxonomy
Eukaryota; Metazoa; Eumetazoa; Bilateria; Protostomia; Spiralia; Lophotrochozoa; Annelida; Polychaeta; Errantia; Phyllodocida; Polynoidae; Alentia; Alentia gelatinosa (Sars, 1835) (NCBI:txid271774).
Background
The Gelatinous Scale Worm ( Alentia gelatinosa) is a polynoid found under rocks and boulders in the intertidal shores of the north-east Atlantic, from Portugal to Norway. In the British Isles it is an abundant and recognisable worm, especially on western coasts. It is rare to absent in the south-east. As with other species in this family, it is typified by the presence of elytra attached to the dorsal surface. The elytra on A. gelatinosa are soft and overlap, covering the entire dorsum, with each scale being covered in cylindrical multifid micro-tubercles. When irritated, A. gelatinosa autotomise these scales and subsequently regrow them ( Wilkie, 2011). The elytra give the worm a ‘dirty white’ colouration and distinctive gelatinous appearance.
This genome contributes to the growing number of polynoid genomes sequenced as part of the Darwin Tree of Life Project, and provides the basis for comparative genomics and future work into the group’s phylogeny ( Lepidonotus clava ( Darbyshire et al., 2022) Acholoe squamosa ( Adkins et al., 2023a), Harmothoe impar ( Adkins et al., 2023b) and Sthenelais limicola ( Darbyshire et al., 2023)).
Genome sequence report
The genome was sequenced from one Alentia gelatinosa ( Figure 1) collected from Hannafore Point, Looe, Cornwall, UK (50.34, –4.45). A total of 31-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 77 missing joins or mis-joins and removed 17 haplotypic duplications, reducing the assembly length by 0.79% and the scaffold number by 16.09%, and increasing the scaffold N50 by 0.39%.
Figure 1. Photograph of the Alentia gelatinosa (wpAleGela1) specimen used for genome sequencing.
A. ventral view of head, B. dorsal view of head, C. dorsal elytra, D. ventral parapods.
The final assembly has a total length of 1237.5 Mb in 192 sequence scaffolds with a scaffold N50 of 79.0 Mb ( Table 1). A summary of the assembly statistics is shown in Figure 2, 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 (99.33%) of the assembly sequence was assigned to 15 chromosomal-level scaffolds. Chromosome-scale scaffolds confirmed by the Hi-C data are named in order of size ( Figure 5; Table 2). Large heterozygous inversions were observed in the following regions: Chromosome 2: 34 Mb to 105 Mb; Chromosome 6: 2 Mb to 44 Mb; Chromosome 12: 21 Mb to 38.5 Mb. 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 Alentia gelatinosa, wpAleGela1.1: metrics.
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 1,237,514,791 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 (180,793,948 bp, shown in red). Orange and pale-orange arcs show the N50 and N90 scaffold lengths (79,000,438 and 50,631,370 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 metazoa_odb10 set is shown in the top right. An interactive version of this figure is available at https://blobtoolkit.genomehubs.org/view/Alentia%20gelatinosa/dataset/CATLOP01/snail.
Figure 3. Genome assembly of Alentia gelatinosa, wpAleGela1.1: BlobToolKit GC-coverage plot.
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/Alentia%20gelatinosa/dataset/CATLOP01/blob.
Figure 4. Genome assembly of Alentia gelatinosa, wpAleGela1.1: BlobToolKit cumulative sequence plot.
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/Alentia%20gelatinosa/dataset/CATLOP01/cumulative.
Figure 5. Genome assembly of Alentia gelatinosa, wpAleGela1.1: Hi-C contact map of the wpAleGela1.1 assembly, visualised using HiGlass.
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=Bvl6OQAaSkGkm3Niwl1GGQ.
Table 1. Genome data for Alentia gelatinosa, wpAleGela1.1.
| Project accession data | ||
|---|---|---|
| Assembly identifier | wpAleGela1.1 | |
| Assembly release date | 2023-07-27 | |
| Species | Alentia gelatinosa | |
| Specimen | wpAleGela1 | |
| NCBI taxonomy ID | 271774 | |
| BioProject | PRJEB60315 | |
| BioSample ID | SAMEA9925843 | |
| Isolate information | wpAleGela1: mid-body (DNA sequencing, Hi-C scaffolding, RNA
sequencing) |
|
| Assembly metrics * | Benchmark | |
| Consensus quality (QV) | 59.4 | ≥ 50 |
| k-mer completeness | 100% | ≥ 95% |
| BUSCO ** | C:95.1%[S:94.3%,D:0.7%],F:3.0%,
M:1.9%,n:954 |
C ≥ 95% |
| Percentage of assembly
mapped to chromosomes |
99.33% | ≥ 95% |
| Sex chromosomes | - | localised homologous pairs |
| Organelles | Mitochondrial genome assembled | complete single alleles |
| Raw data accessions | ||
| PacificBiosciences SEQUEL II | ERR10962212, ERR10962211 | |
| Hi-C Illumina | ERR10968298 | |
| PolyA RNA-Seq Illumina | ERR11242532 | |
| Genome assembly | ||
| Assembly accession | GCA_950022655.1 | |
|
Accession of alternate
haplotype |
GCA_950023025.1 | |
| Span (Mb) | 1237.5 | |
| Number of contigs | 763 | |
| Contig N50 length (Mb) | 3.9 | |
| Number of scaffolds | 192 | |
| Scaffold N50 length (Mb) | 79.0 | |
| Longest scaffold (Mb) | 180.8 | |
* 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 metazoa_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/Alentia%20gelatinosa/dataset/CATLOP01/busco.
Table 2. Chromosomal pseudomolecules in the genome assembly of Alentia gelatinosa, wpAleGela1.
| INSDC accession | Chromosome | Length (Mb) | GC% |
|---|---|---|---|
| OX465579.1 | 1 | 180.79 | 42.0 |
| OX465580.1 | 2 | 145.52 | 42.0 |
| OX465581.1 | 3 | 130.34 | 42.0 |
| OX465582.1 | 4 | 113.18 | 42.0 |
| OX465583.1 | 5 | 79.0 | 42.5 |
| OX465584.1 | 6 | 69.98 | 42.0 |
| OX465585.1 | 7 | 67.23 | 42.0 |
| OX465586.1 | 8 | 65.66 | 42.5 |
| OX465587.1 | 9 | 63.78 | 42.0 |
| OX465588.1 | 10 | 60.17 | 42.5 |
| OX465589.1 | 11 | 59.56 | 42.5 |
| OX465590.1 | 12 | 54.6 | 42.0 |
| OX465591.1 | 13 | 50.63 | 42.0 |
| OX465592.1 | 14 | 50.29 | 42.5 |
| OX465593.1 | 15 | 38.57 | 42.0 |
| OX465594.1 | MT | 0.02 | 36.0 |
The estimated Quality Value (QV) of the final assembly is 59.4 with k-mer completeness of 100%, and the assembly has a BUSCO v5.3.2 completeness of 95.1% (single = 94.3%, duplicated = 0.7%), using the metazoa_odb10 reference set ( n = 954).
Metadata for specimens, spectral estimates, sequencing runs, contaminants and pre-curation assembly statistics can be found at https://links.tol.sanger.ac.uk/species/271774.
Methods
Sample acquisition and nucleic acid extraction
An Alentia gelatinosa (specimen ID MBA-210330-010A, ToLID wpAleGela1) was collected by hand from Hannafore Point, Looe, Cornwall, UK (latitude 50.34, longitude –4.45) on 2021-03-30. The specimen was collected by Rob Mrowicki and Patrick Adkins (Marine Biological Association), identified by Patrick Adkins, and then preserved in liquid nitrogen.
DNA was extracted at the Tree of Life laboratory, Wellcome Sanger Institute (WSI). The wpAleGela1 sample was weighed and dissected on dry ice with tissue set aside for Hi-C sequencing. Tissue from the mid-body was disrupted using a Nippi Powermasher fitted with a BioMasher pestle. High molecular weight (HMW) DNA was extracted using the Qiagen MagAttract HMW DNA extraction kit. HMW DNA was sheared into an average fragment size of 12–20 kb in a Megaruptor 3 system with speed setting 30. Sheared DNA was purified by solid-phase reversible immobilisation using AMPure PB beads with a 1.8X ratio of beads to sample to remove the shorter fragments and concentrate the DNA sample. 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 mid-body tissue of wpAleGela1 in the Tree of Life Laboratory at the WSI using TRIzol, according to the manufacturer’s instructions. RNA was then eluted in 50 μl RNAse-free water and its concentration 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 Agilent RNA 6000 Pico Kit and Eukaryotic Total RNA assay.
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 tissue of wpAleGela1 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 using the gEVAL system (Chow et al., 2016) as described previously ( Howe et al., 2021). Manual curation was performed using gEVAL, 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.
| Software tool | Version | Source |
|---|---|---|
| BlobToolKit | 4.1.7 | https://github.com/blobtoolkit/blobtoolkit |
| BUSCO | 5.3.2 | https://gitlab.com/ezlab/busco |
| Hifiasm | 0.16.1-r375 | https://github.com/chhylp123/hifiasm |
| HiGlass | 1.11.6 | https://github.com/higlass/higlass |
| Merqury | MerquryFK | https://github.com/thegenemyers/MERQURY.FK |
| MitoHiFi | 2 | https://github.com/marcelauliano/MitoHiFi |
| PretextView | 0.2 | https://github.com/wtsi-hpag/PretextView |
| purge_dups | 1.2.3 | https://github.com/dfguan/purge_dups |
| sanger-tol/genomenote | v1.0 | https://github.com/sanger-tol/genomenote |
| sanger-tol/readmapping | 1.1.0 | https://github.com/sanger-tol/readmapping/tree/1.1.0 |
| YaHS | 1.2a | https://github.com/c-zhou/yahs |
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]
Data availability
European Nucleotide Archive: Alentia gelatinosa (a scale worm). Accession number PRJEB60315; https://identifiers.org/ena.embl/PRJEB60315. ( Wellcome Sanger Institute, 2023) The genome sequence is released openly for reuse. The Alentia gelatinosa 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 Marine Biological Association Genome Acquisition Lab are listed here: https://doi.org/10.5281/zenodo.4783604.
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 programme are listed here: https://doi.org/10.5281/zenodo.4783585.
Members of Wellcome Sanger Institute Scientific Operations: DNA Pipelines collective are listed here: https://doi.org/10.5281/zenodo.4790455.
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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