获得胚胎等离子体可以加速脊椎动物的进化
Teri Evans1, Christopher M Wade, Frank A Chapman
1School of Life Sciences, University of Nottingham, Nottingham, NG7 2UH, UK.
概括
与表观发生相比,胚胎等离子体 (预形成) 加快了脊椎动物的基因进化. 这种快速的进化可能会推动物种化,并导致植物遗传学研究中的不一致性.
科学领域:
- 进化生物学是进化的生物学.
- 发育生物学是发展生物学.
- 基因组学就是基因组学.
背景情况:
- 原始生殖细胞 (PGC) 规范遵循两个主要路径:表观 (诱导) 或预形成 (胚胎等离子体).
- 胚胎等离子体,虽然演变趋同,但与脊椎动物的物种增加有关.
- 了解这些不同的PGC规范策略的进化影响至关重要.
研究的目的:
- 为了研究胚胎等离子体存在对脊椎动物蛋白质编码基因进化的速度的影响.
- 确定进化速率的差异是否有助于遗传学不一致.
- 为了测试胚胎等离子体增强进化的假设.
主要方法:
- 蛋白质编码序列的比较分析.
- 使用预形成 (胚胎等离子体) 的脊椎动物物种与使用表观遗传 (epigenesis) 的它们的姐妹种类之间的比较.
- 对基因进化率和遗传学数据的分析.
主要成果:
- 基因在利用胚胎等离子体 (预形成) 的脊椎动物物种中演变得显著更快.
- 含有胚胎等离子体的物种的加速进化速率似乎是遗传学不一致的一个来源.
- 有证据表明,胚胎等离子体释放发育约束,促进进化的可能性.
结论:
- 胚胎等离子体的进化与加速的分子进化的速度有关.
- 由胚胎等离子体驱动的增强进化能力可能是脊椎动物物种化的一个关键因素.
- 胚胎等离子体在PGC规范中的作用影响了更广泛的进化轨迹.
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