遗传学揭示了深层的软体动物关系
Kevin M Kocot1, Johanna T Cannon, Christiane Todt
1Department of Biological Sciences, Auburn University, 101 Rouse Life Sciences, Auburn, Alabama 36849, USA. kmkocot@auburn.edu
Nature
|September 6, 2011
概括
软体动物的进化历史是通过基因组学数据来澄清的,揭示了和类似虫的软体动物组成了一个类. 这项研究还提出了一个新的分类,Pleistomollusca,对于胃类动物和双动物.
科学领域:
- * 动物学 动物学
- * 进化生物学 进化生物学
- * 人类遗传学
背景情况:
- * 八个主要的软体动物血统之间的进化关系在很大程度上仍未解决.
- *以前使用核核糖体基因或形态学的遗传学研究未能建立稳固的关系.
- *有限的基因组资源阻碍了在软体动物研究中应用类基因组方法.
研究的目的:
- * 解开了类 (Mollusca) 内的深层进化关系.
- *利用转录组和基因组数据来重建一个得到良好支持的软体动物族系.
- * 根据新的遗传学框架,研究关键形态特征的演变.
主要方法:
- * 基因组分析使用主要软体动物血统 (不包括Monoplacophora) 的转录组和基因组数据.
- * 基于恢复的进化关系对形态特征进行比较分析.
主要成果:
- * 找到了一个支持良好的软体动物的基因组学拓.
- * 强有力的支持Aculifera假设,将多种白 () 与一个单体白 (Aplacophora) 归类.
- *确定了Gastropoda和Bivalvia之间的姐妹分类关系,导致了新的分类Pleistomollusca的提议.
结论:
- * 这项研究为软体动物提供了强有力的基因组,解决了长期存在的进化问题.
- *这些发现支持Aculifera类并确定Pleistomollusca (Gastropoda + Bivalvia) 作为主要的血统.
- * 证据表明,先进的头化和贝发育可能在软体动物中独立地进化了多次.
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