从亚当的肋骨:西伯利亚的雌性W染色体来自于它的Z对应物
Aleksandra A Shipova1, Irina A Belousova2,3, Maria E Yakimova2,3
1Institute of Cytology and Genetics SB RAS, Novosibirsk, 630090, Russia.
Molecular biology and evolution
|March 4, 2026
概括
三种物种的W染色体,包括害虫Dendrolimus sibiricus,起源于它们的Z染色体. 这种周转机制可能在类类动物进化中很常见.
科学领域:
- 基因组学就是基因组学.
- 进化生物学 进化生物学
- 昆虫学 昆虫学是一门学科.
背景情况:
- 类鸟物种通常表现出WZ/ZZ性别染色体系统,这意味着它们具有共同的进化起源.
- 然而,W染色体的显著变异表明多个独立的起源.
- 北极森林害虫Dendrolimus sibiricus为研究W染色体演变提供了一个独特的案例.
研究的目的:
- 为了研究Dendrolimus sibiricus的基因组,专注于它的性染色体.
- 为了确定D. sibiricus. W染色体的起源和组成.
- 为了比较 W 染色体在相关的类类动物物种中的演变.
主要方法:
- 女性D. sibiricus的染色体规模基因组组合.
- 性染色体 (Z和W) 的识别和测序.
- 与相关的Dendrolimus物种和Lasiocampa quercus进行基因组比较分析.
主要成果:
- 型D. sibiricus具有30个染色体对,具有WZ/ZZ系统.
- 它的W染色体由最近获得的序列组成,包括年轻的重复和Z衍生的位置,以及Wolbachia内生生物DNA.
- D. sibiricus W 染色体与 D. tabulaeformis 和 L. quercus 的 W 染色体没有共同的祖先序列,这些染色体也显示出 Z 衍生元素,在 D. tabulaeformis 中,线粒体碎片.
结论:
- 在D. sibiricus,D. tabulaeformis和L. quercus中,W染色体最近和独立于它们的Z染色体而进化.
- 这种W染色体循环的机制可能在类类动物进化中普遍存在.
- 独立的W染色体起源提供了一种策略来抵消非重组染色体的退化.
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