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古老的基因连接支持类动物是其他动物的姐妹
Darrin T Schultz1,2,3, Steven H D Haddock4,5, Jessen V Bredeson6
1Department of Neuroscience and Developmental Biology, University of Vienna, Vienna, Austria. darrin.schultz@univie.ac.at.
Nature
|May 17, 2023
概括
这项研究解决了动物的家族树,发现鱼 (ctenophores) 是最早的动物群. 这种进化洞察力澄清了神经系统等复杂特征的起源.
科学领域:
- 进化生物学
- 基因组学
- 遗传学
背景情况:
- 作为所有其他动物的姐妹群体,海绵和 () 的进化地位仍然未解决.
- 这一辩论对于理解动物特征的演变,包括神经系统,具有重要意义.
- 之前使用形态学和基因序列的遗传学分析未能最终回答这个问题.
研究的目的:
- 使用染色体尺度基因连接 (合成) 作为新型的基因特征来解决海绵和的基因排列.
- 通过将动物基因组与单细胞亲属基因组进行比较,重建祖先的基因序列模式.
主要方法:
- 染色体尺度基因链接 (合成) 分析的开发,用于基因复构.
- 测序新的染色体规模的基因组,一个,两个海绵,和三个单细胞动物的亲属 (外组).
- 合成模式的比较分析以确定保存和衍生的染色体重组.
主要成果:
- 在动物和单细胞亲属之间保存的古老合成体的识别.
- 单细胞真核生物和单细胞真核生物具有共同的祖先模式.
- 海绵,双体动物和类动物共享衍生的染色体重排,表明单体类不包括类动物.
结论:
- 这项研究支持胞妹妹假设,将胞作为所有其他动物的姐妹群.
- 保存的合成特征为这一结论提供了强大的遗传学支持.
- 这些发现为解决深层次的遗传学问题和了解早期动物进化提供了新的框架.
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