植物基因组学支持了Demospongiae (Porifera科) 的高级分类
Dennis V Lavrov1, Maria C Diaz2,3, Manuel Maldonado4
1Department of Ecology, Evolution, and Organismal Biology, Iowa State University, Ames, Iowa, United States of America.
PloS one
|December 4, 2023
概括
这项研究使用线粒体基因组来完善Demospongiae的分类,这是一个主要的海绵群. 结果证实了现有的关系,并揭示了 Heteroscleromorpha 内的五个不同的类,其古老起源可以追溯到古老生态时代.
科学领域:
- 海洋生物学 海洋生物学
- 进化生物学 进化生物学
- 基因组学就是基因组学.
背景情况:
- 类 (Demospongiae) 是类 (Porifera) 中最大的,在三个子类中拥有近8000个物种.
- 甲状腺菌类 (Heteroscleromorpha) 分类包括~90%的海绵类物种,分为17个类.
- 之前的分子研究使用了有限的基因数据,因此需要使用更大的数据集进行验证,以便进行更高层次的分类.
研究的目的:
- 通过使用全面的线粒体 (mt) 基因组数据集,测试Demospongiae,特别是Heteroscleromorpha内的遗传关系.
- 为了研究非同寻常的没有刺的海绵Myceliospongia araneosa的遗传位置.
- 为 Heteroscleromorpha 的多样化提供时间背景.
主要方法:
- 编制了136种类型的线粒体 (mt) 基因组数据集,其中包括70种新测序或组装的基因组.
- 使用了遗传学分析来推断Demospongiae和Heteroscleromorpha之间的关系.
- 应用分子时钟分析以确定分离事件的日期.
主要成果:
- 支持 Heteroscleromorpha 和 Keratosa + Verongimorpha 之间的姐妹群关系.
- 在 Heteroscleromorpha (C0-C4) 中确定了五个主要分类,具有特定的顺序组成.
- 解决了Myceliospongia araneosa在C3类 (Tetractinellida) 中的遗传学位置.
- 确定了从坎布里亚到早期西卢里亚时期的Heteroscleromorpha的主要分歧,其顺序起源于中古时期.
结论:
- 这项研究的结果与公认的 Heteroscleromorpha 分类大致一致.
- 综合性mt基因组数据集提供了增强的分辨率和时间洞察力来了解demospong进化.
- 马.阿拉尼奥萨的基因分布有助于了解海绵群的多样性和分类.
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