{
  "id": 2700959,
  "title": "High-quality reference genome of the African hermit spider, Nephilingis cruentata, and sex chromosome evolution in spiders",
  "url": "https://urgent.news/2026/08/22/high-quality-reference-genome-of-the-african-hermit-spider",
  "topic": "science",
  "section": "Science",
  "published": "2026-08-22T00:00:00.000Z",
  "source": {
    "name": "bioRxiv",
    "slug": "biorxiv",
    "url": "https://www.biorxiv.org/content/10.64898/2026.08.18.745515v1?rss=1"
  },
  "original_language": "en",
  "account": "Chromosome-level genome of African hermit spider published, sheds light on sex chromosome evolution\n\nScientists have released a chromosome-level genome assembly for the African hermit spider, Nephilingis cruentata. This species exhibits extreme female-biased sexual size dimorphism and a sex chromosome system inferred from cytogenetic data as XX2. The final assembly spans 1.72 Gbp, assigning 99.5% of the genome to 13 pseudochromosomes. With an N50 of 131.6 Mbp and a BUSCO completeness score of 98.8%, the assembly includes 20,021 protein-coding genes. The repetitive elements make up 42.7% of the genome.\n\nThrough sex-specific whole-genome resequencing, researchers identified Chr02 and Chr07 as candidate X chromosomes, aligning with the expected XX2 system. By comparing the genome to existing chromosome-scale assemblies of spiders, the study found that sex-linked chromosomes maintain broad homologous identity across various spider lineages. However, these chromosomes show lower synteny conservation and greater chromosome-length divergence compared to autosomes. These findings suggest that spider sex chromosomes are conserved in terms of homologous identity but exhibit greater structural variability, providing a comparative framework for studying sex chromosome conservation and divergence among Araneae.",
  "summary": "Background: Chromosome-level genome assemblies are increasingly enabling tests of chromosome evolution, conserved synteny, and sex chromosome conservation across diverse animal lineages, including spiders. Results: Here, we present a chromosome-level genome assembly for the African hermit spider, Nephilingis cruentata, a species with extreme female-biased sexual size dimorphism and a…",
  "key_points": [],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}