
==== Front
Wellcome Open Res
Wellcome Open Res
Wellcome Open Research
2398-502X
F1000 Research Limited London, UK

10.12688/wellcomeopenres.19764.1
Data Note
Articles
The genome sequence of a chalcid wasp, Gastracanthus pulcherrimus (Westwood, 1833)
[version 1; peer review: 2 approved]

Broad Gavin R. Investigation Resources Writing – Original Draft Preparation Writing – Review & Editing https://orcid.org/0000-0001-7223-5333
1
Fletcher Chris Investigation Resources https://orcid.org/0000-0002-1944-5048
1
Januszczak Inez Investigation Resources https://orcid.org/0000-0003-3857-9989
1
Natural History Museum Genome Acquisition Lab
Darwin Tree of Life Barcoding collective
Wellcome Sanger Institute Tree of Life programme
Wellcome Sanger Institute Scientific Operations: DNA Pipelines collective
Tree of Life Core Informatics collective
Darwin Tree of Life Consortiuma
1 Natural History Museum, London, England, UK
a mark.blaxter@sanger.ac.uk
No competing interests were disclosed.

12 10 2023
2023
8 44019 7 2023
Copyright: © 2023 Broad GR et al.
2023
https://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

We present a genome assembly from an individual female Gastracanthus pulcherrimus (a chalcid wasp; Arthropoda; Insecta; Hymenoptera; Pteromalidae). The genome sequence is 1,010.0 megabases in span. Most of the assembly is scaffolded into 5 chromosomal pseudomolecules. The mitochondrial genome has also been assembled and is 24.4 kilobases in length.

Gastracanthus pulcherrimus
chalcid wasp
genome sequence
chromosomal
Hymenoptera
Wellcome Trust218328 Wellcome Trust206194 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.
==== Body
pmcSpecies taxonomy

Eukaryota; Metazoa; Eumetazoa; Bilateria; Protostomia; Ecdysozoa; Panarthropoda; Arthropoda; Mandibulata; Pancrustacea; Hexapoda; Insecta; Dicondylia; Pterygota; Neoptera; Endopterygota; Hymenoptera; Apocrita; Proctotrupomorpha; Chalcidoidea; Pteromalidae; Pteromalinae; Gastracanthus; Gastracanthus pulcherrimus (Westwood, 1833) (NCBI:txid2922068).

Background

With females measuring around 5 mm in length, Gastracanthus pulcherrimus is a relatively large species of the chalcid wasp family Pteromalidae. It is also a striking species, slender, with a particularly long pronotum, metallic green hues and, in females, two large dark patches on each fore wing. Like most parasitoid wasps, G. pulcherrimus is poorly known but it is fairly easily found in deciduous woodland and has a wide range across Europe ( Noyes, 2019), recorded from the Republic of Ireland, Northern Ireland ( Thuróczy & O’Connor, 2009) and from England, but not yet from Wales or Scotland ( Dale-Skey et al., 2016).

Despite its relative conspicuousness, knowledge about the biology of G. pulcherrimus is not extensive. It belongs to the subfamily Trigonoderinae, which all seem to be parasitoids of Coleoptera ( Graham, 1969). Gastracanthus pulcherrimus is associated with wood and has been reported as a parasitoid of a Sphenoptera species (Coloptera: Buprestidae ( Ghahari & Huang, 2012). Graham (1969) expresses doubt about a supposed rearing from an adult byrrhid beetle. By analogy with related Pteromalidae, G. pulcherrimus is presumably an idiobiont ectoparasitoid, i.e., hosts will be permanently paralysed, and the larva develops externally on the host.

The family Pteromalidae, for a long time an unwieldy assemblage of disparate chalcid lineages, has recently been split into many different, hopefully monophyletic families ( Burks et al., 2022). Gastracanthus is among ten genera comprising the subfamily Trigonoderinae, itself one of eight subfamilies within the diverse and species rich Pteromalidae family. All previously published genomes belong to species in the subfamily Pteromalinae ( Martinson et al., 2017; Werren et al., 2010).

Genome sequence report

The genome was sequenced from one female Gastracanthus pulcherrimus ( Figure 1) collected from Wytham Woods, UK (51.77, –1.31). A total of 27-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 48 missing joins or mis-joins and removed one haplotypic duplication, reducing the scaffold number by 6.49%, and increasing the scaffold N50 by 0.45%.

Figure 1. Photograph of the Gastracanthus pulcherrimus (iyGasPulc2) specimen used for genome sequencing.

The final assembly has a total length of 1,010.0 Mb in 143 sequence scaffolds with a scaffold N50 of 186.8 Mb ( Table 1). Most (95,67%) of the assembly sequence was assigned to 5 chromosomal-level scaffolds. Chromosome-scale scaffolds confirmed by the Hi-C data are named in order of size ( Figure 2– 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.

Table 1. Genome data for Gastracanthus pulcherrimus, iyGasPulc2.1.

Project accession data	
Assembly identifier	iyGasPulc2.1	
Species	Gastracanthus pulcherrimus	
Specimen	iyGasPulc2	
NCBI taxonomy ID	2922068	
BioProject	PRJEB59075	
BioSample ID	SAMEA110043171	
Isolate information	iyGasPulc2, female: whole organism (DNA sequencing)
iyGasPulc1: whole organisms (Hi-C scaffolding)	
Assembly metrics *	Benchmark	
Consensus quality (QV)	54.3	≥ 50	
k-mer completeness	99.98%	≥ 95%	
BUSCO **	C:92.6%[S:91.7%,D:0.9%],
F:1.9%,M:5.5%,n:5,991	C ≥ 95%	
Percentage of assembly mapped to chromosomes	95.67%	≥ 95%	
Sex chromosomes	-	localised homologous pairs	
Organelles	Mitochondrial genome assembled	complete single alleles	
Raw data accessions	
PacificBiosciences SEQUEL II	ERR10798431	
Hi-C Illumina	ERR10802452	
Genome assembly	
Assembly accession	GCA_949152435.1	
Accession of alternate
haplotype	GCA_949152415.1	
Span (Mb)	1,010.0	
Number of contigs	954	
Contig N50 length (Mb)	1.9	
Number of scaffolds	143	
Scaffold N50 length (Mb)	186.8	
Longest scaffold (Mb)	222.5	
* 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 hymenoptera_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/iyGasPulc2.1/dataset/CASCKD01/busco.

Figure 2. Genome assembly of Gastracanthus pulcherrimus, iyGasPulc2.1: 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 1,010,024,266 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 (222,508,353 bp, shown in red). Orange and pale-orange arcs show the N50 and N90 scaffold lengths (186,761,157 and 179,352,141 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 hymenoptera_odb10 set is shown in the top right. An interactive version of this figure is available at https://blobtoolkit.genomehubs.org/view/iyGasPulc2.1/dataset/CASCKD01/snail.

Figure 3. Genome assembly of Gastracanthus pulcherrimus, iyGasPulc2.1: 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/iyGasPulc2.1/dataset/CASCKD01/blob.

Figure 4. Genome assembly of Gastracanthus pulcherrimus, iyGasPulc2.1: 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/iyGasPulc2.1/dataset/CASCKD01/cumulative.

Figure 5. Genome assembly of Gastracanthus pulcherrimus, iyGasPulc2.1: Hi-C contact map of the iyGasPulc2.1 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=Yrs3ERn6RL-maDBtEFqvcA.

Table 2. Chromosomal pseudomolecules in the genome assembly of Gastracanthus pulcherrimus, iyGasPulc2.

INSDC accession	Chromosome	Length (Mb)	GC%	
OX424572.1	1	222.51	35.0	
OX424573.1	2	191.63	35.5	
OX424574.1	3	186.76	35.5	
OX424575.1	4	186.09	35.0	
OX424576.1	5	179.35	35.0	
OX424577.1	MT	0.02	19.5	

The estimated Quality Value (QV) of the final assembly is 54.3 with k-mer completeness of 99.98%, and the assembly has a BUSCO v5.3.2 completeness of 92.6% (single = 91.7%, duplicated = 0.9%), using the hymenoptera_odb10 reference set ( n = 5,991).

Metadata for specimens, spectral estimates, sequencing runs, contaminants and pre-curation assembly statistics can be found at https://links.tol.sanger.ac.uk/species/2922068.

Methods

Sample acquisition and nucleic acid extraction

Two adult Gastracanthus pulcherrimus were collected from Bert’s Pheasant Pen, Wytham Woods, Oxfordshire (biological vice-county Berkshire), UK (latitude 51.77, longitude –1.31) on 2021-09-02, using a light trap. The collectors were Gavin Broad, Chris Fletcher and Inez Januszczak (Natural History Museum). The specimens were identified by Gavin Broad and then dry-frozen at –80°C. The specimen used for DNA sequencing was specimen ID NHMUK014451697, ToLID iyGasPulc2, while specimen ID NHMUK014451655, ToLID iyGasPulc1 was used for Hi-C scaffolding.

DNA was extracted at the Tree of Life laboratory, Wellcome Sanger Institute (WSI). The iyGasPulc2 sample was weighed and dissected on dry ice with tissue set aside for Hi-C sequencing. Tissue from the whole organism 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.

Sequencing

Pacific Biosciences HiFi circular consensus DNA sequencing libraries were constructed according to the manufacturers’ instructions. DNA sequencing was performed by the Scientific Operations core at the WSI on a Pacific Biosciences SEQUEL IIe (HiFi) instrument. Hi-C data were also generated from whole organism tissue of iyGasPulc1 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., 2022), 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	4.1.5	https://github.com/blobtoolkit/blobtoolkit	
BUSCO	5.3.2	https://gitlab.com/ezlab/busco	
gEVAL	N/A	https://geval.org.uk/	
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.

Data availability

European Nucleotide Archive: Gastracanthus pulcherrimus. Accession number PRJEB59075; https://identifiers.org/ena.embl/PRJEB59075. ( Wellcome Sanger Institute, 2023)

The genome sequence is released openly for reuse. The Gastracanthus pulcherrimus 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.4790042.

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.

10.21956/wellcomeopenres.21890.r95768
Reviewer response for version 1
Garcia-Souto Daniel 1Referee https://orcid.org/0000-0002-0997-8799

1 Bioquímica, xenética e inmunoloxía, Universidade de Vigo (Ringgold ID: 16784), Vigo, Galicia, Spain
16 9 2024 Copyright: © 2024 Garcia-Souto D
2024
https://creativecommons.org/licenses/by/4.0/ This is an open access peer review report distributed under the terms of the Creative Commons Attribution Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Version 1recommendationapprove
This manuscript presents a chromosome-level genome assembly of Gastracanthus pulcherrimus, a species of chalcid wasp in the family Pteromalidae. The study provides significant insights into the genomic structure of this relatively understudied species, with a genome span of 1,010.0 megabases. The assembly was primarily scaffolded into five chromosomal pseudomolecules, covering 95.67% of the genome, which highlights the high degree of completeness in the assembly. The authors also sequenced and assembled the mitochondrial genome, which is 24.4 kilobases in length, potentially indicating expansions or repeats in the control region that would, in my honest opinion, require some validation.

The manuscript makes a notable contribution to the genomic data of the genus, as this is one of the few genomes from the Pteromalidae family outside the Pteromalinae subfamily. Although the final assembly's BUSCO score is slightly lower than the desired threshold (92.6% completeness), this is still a strong result for a genome of such complexity.

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:

Genomics, Molecular Cytogenetics, Epigenetics, Karyotyping.

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.

10.21956/wellcomeopenres.21890.r95766
Reviewer response for version 1
Koch Jonathan Berenguer Uhuad 1Referee https://orcid.org/0000-0002-6654-7370

1 USDA-ARS Pollinating Insect Research Unit, Maryland, USA
4 9 2024 Copyright: © 2024 Koch JBU
2024
https://creativecommons.org/licenses/by/4.0/ This is an open access peer review report distributed under the terms of the Creative Commons Attribution Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Version 1recommendationapprove
The article describes a genome assembly of  Gastracanthus pulcherrimus from a female specimen. The authors clearly articulate the generation of the genome assembly using PacBio HiFi and HiC. The genome assembly still needs to be annotated, and in currently in the queue. 

One minor point  Rephrase "The family Pteromalidae, for a long time an unwieldy assemblage of disparate chalcid lineages, has recently been split into many different, hopefully monophyletic families" to "The family Pteromalidae, for a long time an unwieldy assemblage of disparate chalcid lineages, has recently been split into many different, likely monophyletic families"

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 genetics, genomics

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.

Competing interests: No competing interests were disclosed.

Competing interests: No competing interests were disclosed.
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