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Article

Evolutionary dynamics of sex determination in Branchiostoma belcheri driven by repeated transposition of a single novel gene.

Nature communications - 13 Jan 2026

Li Huan, Liu Fujiang, Li Jingjing, Shi Chenggang, Lin Zhenyi, Qin Yucheng, Pan Rongrong, Wu Xiaotong, Peng Yongying, Xing Chaofan, Wang Yiquan, Qu Qingming, Li Guang

Abstract excerpt

Sex determination systems display striking evolutionary flexibility, yet the mechanisms underlying their transitions remain poorly understood. Using newly generated genome assemblies, we investigated the evolving sex-determining system in the amphioxus Branchiostoma belcheri. We identified two female-specific sex-determining regions (SDRs) on chromosome 13, both derived from independent transpositions of the...

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Identifiers

PMID: 41530154
DOI: 10.1038/s41467-026-68322-6
PMCID: PMC12905397

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