头足动物的性别确定及其古代进化起源
Gabrielle C Coffing1, Silas Tittes1, Scott T Small1
1Department of Biology, University of Oregon.
bioRxiv : the preprint server for biology
|March 11, 2024
概括
研究人员对加利福尼亚两点章鱼基因组进行了测序,揭示了独特的性别染色体系统 (ZO/ZZ),并提供了首足动物确定性别的第一个遗传证据. 这种古老的染色体在整个头足动物进化过程中一直存在.
科学领域:
- 基因组学就是基因组学.
- 进化生物学 进化生物学
- 海洋生物学 海洋生物学
背景情况:
- 形头足动物 (章鱼,鱼,乌) 拥有复杂的特征,如先进的神经系统和伪装.
- 头足动物代表了一个非常不同的血统,起源于大约5.5亿年前.
- 基因组洞察对于理解新型头足动物特征的演变至关重要.
研究的目的:
- 为了建立加利福尼亚两点章鱼的染色体尺度参考基因组 (O. ) 的物种). bimaculoides.
- 研究独特的头足动物特征的基因组基础,特别是性别确定.
- 重建头足动物性染色体的进化历史.
主要方法:
- 基因组DNA的PacBio长时间读取测序.
- IsoSeq全长mRNA测序用于基因注释.
- 使用多个头足类物种的全基因组对齐进行比较基因组学.
主要成果:
- 一个高质量的,染色体规模的基因组组合和注释O. 已经产生了 bimaculoides.
- 该研究确定了女性的单个性染色体 (ZO) 和男性的两个性染色体 (ZZ),证实了遗传性决定.
- 遗传学分析显示,性别染色体是古老的,早于头足动物辐射 (大约4.8亿年前) 和高度保存.
结论:
- 基因组组合为头足动物研究提供了宝贵的资源.
- 首足动物的遗传性决定得到证实,具有保存的,古老的性别染色体.
- 这一发现为无脊椎动物的性别决定机制的演变提供了新的视角.
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