2025-04-03 中国科学院(CAS)
<関連情報>
- https://english.cas.cn/newsroom/research_news/life/202504/t20250403_909291.shtml
- https://www.science.org/doi/10.1126/sciadv.adt6477
ヘビにおける単為生殖と3倍体形成の進化に関するゲノム学的知見 Genomic insights into evolution of parthenogenesis and triploidy in the flowerpot snake
Yunyun Lv, Wei Wu, Jin-Long Ren, Matthew K. Fujita, […], and Jia-Tang Li
Science Advances Published:2 Apr 2025
DOI:https://doi.org/10.1126/sciadv.adt6477
Abstract
The flowerpot snake (Indotyphlops braminus) is the only known parthenogenetic and triploid species within Serpentes. However, the genetic basis underlying this phenomenon remains unresolved. We investigated the genomic complexities of this rare all-female triploid reptile. On the basis of the newly assembled genome, we revealed 40 chromosomes grouped into three subgenomes (A, B, and C). Comparative genomic analysis with related diploid species revealed a chromosome fusion event in ancestral genomes. This event shaped the unique genetic landscape of the flowerpot snake. We examined gene expression specificity in ovarian tissues and identified pathways essential for DNA replication and repair. Our findings suggest a potential mechanism of homologous chromosome pairing during meiosis in allopolyploid parthenogenesis. This research provides insights into the evolutionary adaptations and genetic mechanisms underlying parthenogenesis in reptilian species, challenging traditional views on reproductive strategies and genomic evolution in asexual organisms.
