Syntenic relationship of chromosomes in Strongyloides species and Rhabditophanes diutinus based on the chromosome-level genome assemblies

Asuka Kounosu, Simo Sun, Yasunobu Maeda, Mehmet Dayi, Akemi Yoshida, Haruhiko Maruyama, Vicky Hunt, Asako Sugimoto, Taisei Kikuchi

Research output: Contribution to journalArticlepeer-review

2 Citations (SciVal)

Abstract

The Strongyloides clade, to which the parasitic nematode genus Strongyloides belongs, contains taxa with diverse lifestyles, ranging from free-living to obligate vertebrate parasites. Reproductive strategies are also diverse in this group of nematodes, employing not only sexual reproduction but also parthenogenesis, making it an attractive group to study genome adaptation to specific conditions. An in-depth understanding of genome evolution, however, has been hampered by fragmented genome assemblies. In this study, we generated chromosome-level genome assemblies for two Strongyloides species and the outgroup species Rhabditophanes diutinus using long-read sequencing and high‐throughput chromosome conformation capture (Hi-C). Our synteny analyses revealed a clearer picture of chromosome evolution in this group, suggesting that a functional sex chromosome has been maintained throughout the group. We further investigated sex chromosome dynamics in the lifecycle of Strongyloides ratti and found that bivalent formation in oocytes appears to be important for male production in the mitotic parthenogenesis.
Original languageEnglish
Article number20220446
JournalPhilosophical Transactions of the Royal Society B: Biological Sciences
Volume379
Early online date27 Nov 2023
DOIs
Publication statusPublished - 15 Jan 2024

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