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Sexual Development最新文献

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One-step leaping evolution from an autosomal pair to the heteromorphic sex chromosomes. 从一对常染色体到异形性染色体的一步跳跃式进化。
IF 2.4 4区 医学 Q2 DEVELOPMENTAL BIOLOGY Pub Date : 2024-11-09 DOI: 10.1159/000542537
Ikuo Miura, Foyez Shams, Tariq Ezaz, Mitsuaki Ogata

Background: Sex chromosomes evolve from an autosomal pair after the acquisition of a sex-determining gene. The primary sex chromosomes are homomorphic in both sexes and often undergo heteromorphism in either sex (XY in males or ZW in females) in association with chromosome rearrangements such as inversion, which creates a non-recombining region, called a stratum. Then, multiple strata may form by sequential inversions and extend the non-recombining region, where gene divergence accelerates, and degeneration of the Y or W chromosome progressively occurs.

Summary: Contrast to the conventional theory, we propose a shortcut in heteromorphic sex chromosome evolution, where an autosomal pair directly evolves into a heteromorphic sex chromosome pair. We illustrate this with two frog cases where Y chromosome or autosome, which is morphologically inverted, was introgressed from another species through interspecific hybridization, instantly forming a new heteromorphic sex chromosome pair. This event resulted in a distinct non-recombining region immediately after hybridization.

Key messages: The introduction of an inverted chromosome from a different species may be associated with benefits in morphology, breeding behavior, hybrid viability, sex determination, and recovery of the sex ratio of the hybrids. We discuss the molecular mechanisms driving preferential mutations in the introduced, inverted chromosome through interspecific hybridization.

背景:性染色体是在获得性别决定基因后从一对常染色体演变而来的。初级性染色体在两性中都是同形的,但在两性中往往会发生异形(雄性为 XY 或雌性为 ZW),这与染色体重排(如倒位)有关,这种重排会产生一个非重合区,称为 "层"。摘要:与传统理论相反,我们提出了异形性染色体进化的捷径,即常染色体对直接进化成异形性染色体对。我们用两个青蛙案例来说明这一点:Y染色体或自体染色体在形态上是倒位的,通过种间杂交从另一个物种引入,瞬间形成一对新的异形性染色体。这一事件导致杂交后立即出现一个独特的非再结合区域:信息:引入来自不同物种的倒位染色体可能会在形态、繁殖行为、杂种存活率、性别决定以及恢复杂种性别比等方面带来益处。我们讨论了通过种间杂交驱动引入的倒位染色体发生优先突变的分子机制。
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Sexual Development
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