抛物线切换促进了戴达罗米:本体遗传学,微观进化和宏观进化的证据
Rebecca S Colby1,2, Stephen D McCormick3,4, Jonathan P Velotta5
1Department of Ecology and Evolutionary Biology, University of Connecticut, Storrs, CT, USA.
Oecologia
|July 16, 2024
概括
鱼中的基因表达表明,- (Na+,K+-ATPase) 的对应切换是迁移期间适应不同水度的关键. 这种适应在不同的鱼系中独立演变.
科学领域:
- 基因组学和分子生物学
- 生理生态生态学 生理生态学
- 进化生物学 进化生物学
背景情况:
- 淡水和海水之间的二鱼迁移需要进行显著的透调节调整.
- 状离子Na+,K+-ATPase (NKA) 对于透调节至关重要,其对应物 (NKA α1a和NKA α1b) 在不同盐度下呈现相互上调.
- 这种平行交换反应是某些迁徙鱼类物种已知的适应.
研究的目的:
- 调查NKAα子单元在母迁移期间的帕拉洛格表达的本体遗传和微观进化变化.
- 探索NKA对象的宏观进化起源与二面体生命史的关系.
- 为了确定NKA paralog切换和息地盐度之间的联系.
主要方法:
- 在不同盐度条件下对NKAα-亚单元在前迁移和迁移的母 (Alosa pseudoharengus) 中的对等表达的比较分析.
- 试验性暴露年轻的双面体和内陆母在淡水和海水中,以评估依赖盐度的基因表达.
- 对一夫妻NKA类比生物的家族遗传学分析,以了解它们在远方生物中的进化历史.
主要成果:
- 青少年外迁的乳母在海水中比前迁的乳母在海水中表现出更强的NKA对应器切换 (NKAα1a的下调).
- 体鱼和内陆体鱼都表现出盐度依赖的平行变换,体鱼在海水中表现出更高的NKA α1b和更高的NKA α1a下调.
- 分子系谱表明,与其他teleosts相比,alewife NKA类型的独立起源.
结论:
- NKA的方位切换与息地盐度直接相关,在形迁移的度调节挑战中发挥着关键作用.
- 基因重复事件为独立的分子溶液提供了进化基础,支持不同鱼类谱系的双面体生命史.
- 了解这些基因表达模式对于理解迁徙生理学和迁徙行为演变至关重要.
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