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使用转录组数据对brachyuran的家族基因组分析揭示了群体内冲突的家族基因关系的可能来源

Da Pan¹, Yunlong Sun¹, Boyang Shi¹

¹Jiangsu Key Laboratory for Biodiversity and Biotechnology, College of Life Sciences, Nanjing Normal University, 1 Wenyuan Road, Nanjing 210023, PR China.

Molecular phylogenetics and evolution

|September 15, 2024

概括

对的遗传学分析显示,异种不是一个单一的群体. 淡水和Hymenosomatoidea形成了一个独特的分类,不完整的血统分类被认为是基因树不一致的关键因素.

科学领域:

甲动物生物学甲动物生物学
分子遗传学分子遗传学
进化生物学是进化的生物学.

背景情况:

尽管进行了广泛的研究,但Brachyura () 类的基因关系在很大程度上仍未得到解决.
以前的分子研究往往由于有限的标记而缺乏分辨率,导致潜在的错误,如随机错误和不完整的谱系排序 (ILS).

研究的目的:

使用全面的转录组数据重建Brachyura的分类.
为了澄清不确定的种类的遗传学位置,并解决系统性错误.
为了研究主要群体的进化历史和分歧时间.

主要方法:

从56个brachyuran物种的转录组数据的家族遗传学分析,包括14个新测序的种类.
构建五个超级矩阵以减轻系统错误的不同来源.
使用分子数据进行分歧时间估计.

主要成果:

研究人员发现,Heterotremata下层是非单体的.
一个不同的分类,包括旧世界的淡水 (Potamidae,Gecarcinucidae) 和Hymenosomatoidea被确定为Thoracotremata的姐妹,在Heterotremata之外.
不完整的血统分类 (ILS) 被确定为淡水中基因树不一致的主要原因.
布拉基乌拉起源于三叠纪或罗纪,现存的大部分家族出现在白纪.
大约1200万年前,鱼类和鱼类从海洋祖先中分离出来.

结论:

这项研究为Brachyura提供了一个强大的遗传学框架,挑战了现有的分类.
建立了对淡水的进化及其与海洋祖先的分歧的新见解.
这些发现为重新分类有问题的brachyuran群体和了解它们的进化历史提供了基础.

关键词:

布拉基乌拉 (Brachyura) 是一个非常古老的生物.淡水大是什么意思淡水大基因树不一致性基因树不一致性在 ILS ILS ILS 遗传学上,这是一个很大的问题.

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