{"entity": "researcher", "timestamp": "2026-09-23T14:48:57.320Z", "family": "Cooper", "given": "Steven J B", "initials": "SJB", "orcid": "0000-0002-7843-8438", "affiliations": ["Evolutionary Biology Unit, South Australian Museum, Adelaide, South Australia, Australia.", "School of Biological Sciences and Environment Institute, The University of Adelaide, Adelaide, South Australia, Australia."], "links": {"self": {"href": "https://publications-affiliated.scilifelab.se/researcher/771a0a9bd4174d10ab02a1f2a08da9fb.json"}, "display": {"href": "https://publications-affiliated.scilifelab.se/researcher/771a0a9bd4174d10ab02a1f2a08da9fb"}}, "publications": [{"entity": "publication", "iuid": "ffae1e4181c347cb9177c68008efad8e", "links": {"self": {"href": "https://publications-affiliated.scilifelab.se/publication/ffae1e4181c347cb9177c68008efad8e.json"}, "display": {"href": "https://publications-affiliated.scilifelab.se/publication/ffae1e4181c347cb9177c68008efad8e"}}, "title": "Orthopteran Neo-Sex Chromosomes Reveal Dynamics of Recombination Suppression and Evolution of Supergenes.", "authors": [{"family": "Jayaprasad", "given": "Suvratha", "initials": "S"}, {"family": "Peona", "given": "Valentina", "initials": "V", "orcid": "0000-0001-5119-1837", "researcher": {"href": "https://publications-affiliated.scilifelab.se/researcher/12d645d316a64a54ad02fb915cf9b2d6.json"}}, {"family": "Ellerstrand", "given": "Simon J", "initials": "SJ", "orcid": "0000-0003-2674-6997", "researcher": {"href": "https://publications-affiliated.scilifelab.se/researcher/e36f041d79c240d2aa669a1e24e168d7.json"}}, {"family": "Rossini", "given": "Roberto", "initials": "R"}, {"family": "Bunikis", "given": "Ignas", "initials": "I"}, {"family": "Pettersson", "given": "Olga V", "initials": "OV", "orcid": "0000-0002-5597-1870", "researcher": {"href": "https://publications-affiliated.scilifelab.se/researcher/f513ec3fb924415a9e579d1c829c7d2d.json"}}, {"family": "Olsen", "given": "Remi-Andr\u00e9", "initials": "RA", "orcid": "0009-0002-8357-5186", "researcher": {"href": "https://publications-affiliated.scilifelab.se/researcher/b2a00756397a4aa58f539513e5b8b37f.json"}}, {"family": "Rubin", "given": "Carl-Johan", "initials": "CJ", "orcid": "0000-0001-8238-5052", "researcher": {"href": "https://publications-affiliated.scilifelab.se/researcher/cc83e7c8e44145778f170d3ac49c52a6.json"}}, {"family": "Einarsdottir", "given": "Elisabet", "initials": "E", "orcid": "0000-0003-3101-2285", "researcher": {"href": "https://publications-affiliated.scilifelab.se/researcher/ae255687b53f4926b4cb9ad06dcf6edc.json"}}, {"family": "Bonath", "given": "Franziska", "initials": "F"}, {"family": "Bradford", "given": "Tessa M", "initials": "TM", "orcid": "0000-0003-0607-1398", "researcher": {"href": "https://publications-affiliated.scilifelab.se/researcher/41bad8c13b55485c998822fa4c43d267.json"}}, {"family": "Cooper", "given": "Steven J B", "initials": "SJB", "orcid": "0000-0002-7843-8438", "researcher": {"href": "https://publications-affiliated.scilifelab.se/researcher/771a0a9bd4174d10ab02a1f2a08da9fb.json"}}, {"family": "Hansson", "given": "Bengt", "initials": "B", "orcid": "0000-0001-6694-8169", "researcher": {"href": "https://publications-affiliated.scilifelab.se/researcher/f0451b7e0a83450698af8d37c522279e.json"}}, {"family": "Suh", "given": "Alexander", "initials": "A", "orcid": "0000-0002-8979-9992", "researcher": {"href": "https://publications-affiliated.scilifelab.se/researcher/e1790a31477c4376957d8c328299db1c.json"}}, {"family": "Kawakami", "given": "Takeshi", "initials": "T", "orcid": "0000-0002-9204-6852", "researcher": {"href": "https://publications-affiliated.scilifelab.se/researcher/843ff3f21fde4acdb15729e96cb0ae4c.json"}}, {"family": "Schielzeth", "given": "Holger", "initials": "H", "orcid": "0000-0002-9124-2261", "researcher": {"href": "https://publications-affiliated.scilifelab.se/researcher/185297e474cc4e09b1f2087fb7d902a1.json"}}, {"family": "Palacios-Gimenez", "given": "Octavio M", "initials": "OM", "orcid": "0000-0002-1472-9949", "researcher": {"href": "https://publications-affiliated.scilifelab.se/researcher/c4d3d53ea54b4ec293da675c9c63a0de.json"}}], "type": "journal article", "published": "2024-12-00", "journal": {"title": "Mol. Ecol.", "issn": "1365-294X", "volume": "33", "issue": "23", "pages": "e17567", "issn-l": "0962-1083"}, "abstract": "The early evolution of sex chromosomes has remained obscure for more than a century. The Vandiemenella viatica species group of morabine grasshoppers is highly suited for studying the early stages of sex chromosome divergence and degeneration of the Y chromosome. This stems from the fact that neo-XY sex chromosomes have independently evolved multiple times by X-autosome fusions with different autosomes. Here, we generated new chromosome-level assemblies for two chromosomal races representing karyotypes with and without neo-sex chromosomes (P24XY and P24X0), and sequence data of a third chromosomal race with a different neo-XY chromosome system (P25XY). Interestingly, these two neo-XY chromosomal races are formed by different X-autosome fusions (involving chr1 and chrB, respectively), and we found that both neo-Y chromosomes have partly ceased to recombine with their neo-X counterpart. We show that the neo-XY chromosomes have diverged through accumulation of SNPs and structural mutations, and that many neo-Y-linked genes have degenerated since recombination ceased. However, the non-recombining regions of neo-Y chromosomes host non-degenerated genes crucial for sex determination, such as sex-lethal and transformer, alongside genes associated with spermatogenesis, fertility, and reproduction, illustrating their integrative role as a masculinizing supergene. Contrary to expectations, the neo-Y chromosomes showed (slightly) lower density of transposable elements (TEs) compared to other genomic regions. The study reveals the unique dynamics of young sex chromosomes, with evolution of recombination suppression and pronounced decay of (some) neo-sex chromosome genes, and provides a compelling case illustrating how chromosomal fusions and post-fusion mutational processes contribute to the evolution of supergenes.", "doi": "10.1111/mec.17567", "pmid": "39475093", "labels": [], "xrefs": [{"db": "pmc", "key": "PMC11589690"}], "notes": [], "created": "2026-09-23T11:34:42.294Z", "modified": "2026-09-23T11:34:42.591Z"}, {"entity": "publication", "iuid": "7a08a2edb60e44dc8dd34cc96cf412cd", "links": {"self": {"href": "https://publications-affiliated.scilifelab.se/publication/7a08a2edb60e44dc8dd34cc96cf412cd.json"}, "display": {"href": "https://publications-affiliated.scilifelab.se/publication/7a08a2edb60e44dc8dd34cc96cf412cd"}}, "title": "Chromosome-level genome assembly of the morabine grasshopper Vandiemenella viatica19.", "authors": [{"family": "Li", "given": "Xuan", "initials": "X", "orcid": "0000-0003-0066-2373", "researcher": {"href": "https://publications-affiliated.scilifelab.se/researcher/3ce54ca4d2f64483b3f53700f53aed30.json"}}, {"family": "Jayaprasad", "given": "Suvratha", "initials": "S"}, {"family": "Einarsdottir", "given": "Elisabet", "initials": "E", "orcid": "0000-0003-3101-2285", "researcher": {"href": "https://publications-affiliated.scilifelab.se/researcher/ae255687b53f4926b4cb9ad06dcf6edc.json"}}, {"family": "Cooper", "given": "Steven J B", "initials": "SJB", "orcid": "0000-0002-7843-8438", "researcher": {"href": "https://publications-affiliated.scilifelab.se/researcher/771a0a9bd4174d10ab02a1f2a08da9fb.json"}}, {"family": "Suh", "given": "Alexander", "initials": "A"}, {"family": "Kawakami", "given": "Takeshi", "initials": "T"}, {"family": "Palacios-Gimenez", "given": "Octavio Manuel", "initials": "OM", "orcid": "0000-0002-1472-9949", "researcher": {"href": "https://publications-affiliated.scilifelab.se/researcher/c4d3d53ea54b4ec293da675c9c63a0de.json"}}], "type": "journal article", "published": "2024-09-12", "journal": {"title": "Sci Data", "issn": "2052-4463", "volume": "11", "issue": "1", "pages": "997", "issn-l": "2052-4463"}, "abstract": "Morabine grasshoppers in the Vandiemenella viatica species group, which show karyotype diversity, have been studied for their ecological distribution and speciation in relation to their genetic and chromosomal diversity. They are good models for studying sex chromosome evolution as \"old\" and newly emerged sex chromosomes co-exist within the group. Here we present a reference genome for the viatica19 chromosomal race, that possesses the ancestral karyotype within the group. Using PacBio HiFi and Hi-C sequencing, we generated a chromosome-level assembly of 4.09 Gb in span, scaffold N50 of 429 Mb, and complete BUSCO score of 98.1%, containing 10 pseudo-chromosomes. We provide Illumina datasets of males and females, used to identify the X chromosome. The assembly contains 19,034 predicted protein-coding genes, and a total of 75.21% of repetitive DNA sequences. By leveraging HiFi reads, we mapped the genome-wide distribution of methylated bases (5mC and 6 mA). This comprehensive assembly offers a robust reference for morabine grasshoppers and supports further research into speciation and sex chromosome diversification within the group and its related species.", "doi": "10.1038/s41597-024-03858-0", "pmid": "39266578", "labels": [], "xrefs": [{"db": "pmc", "key": "PMC11393057"}, {"db": "pii", "key": "10.1038/s41597-024-03858-0"}], "notes": [], "created": "2026-09-23T14:28:16.935Z", "modified": "2026-09-23T14:28:17.050Z"}]}