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Updated: Sep 18, 2025

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塑体和染色体的起源和传播的日期
Filip Pietluch1,2, Paweł Mackiewicz1, Katarzyna Sidorczuk1
1Department of Bioinformatics and Genomics, Faculty of Biotechnology, University of Wroclaw, 50-383 Wroclaw, Poland.
International journal of molecular sciences
|June 26, 2025
概括
对于地球生物圈至关重要的塑进化,起源于蓝藻细菌的吞. 这项研究揭示了主要的塑类生物在21亿年前进化,早于绿光细胞分离.
科学领域:
- 进化生物学是进化的生物学.
- 分子生物学分子生物学
- 生物地质化学生物地质化学
背景情况:
- 光合作用真核生物通过塑体产生氧气和有机化合物,这些塑体起源于内共生蓝藻细菌.
- 已知有两个主要的蓝藻细菌内共生事件:一个是形成Archaeplastida血统,另一个是创建Paulinella染色体.
- 古代塑生物促进了二次内生共生,将光合作用传播到其他真核生物群体.
研究的目的:
- 通过全面的植物遗传学和分子钟分析,重建塑性动物的进化时间线.
- 为了确定初级塑原始的年龄和随后的内共生事件.
- 评估分子时钟模型和校准策略对进化年龄估计的影响.
主要方法:
- 对来自108种不同的光合作用种群的塑性质编码蛋白质的遗传学分析.
- 分子时钟的约会结合了新的化石校准.
- 基于不同时钟模型和校准套件的年龄估计的比较分析.
主要成果:
- 初级塑类物种在21亿至18亿年前之前进化,在绿光细胞的分化之前.
- *Paulinella*染色体可能起源于29.22.66亿年前.
- 二次内共生事件发生在1.71.4亿年前 (红色/绿色藻类转化为加密生物) 和1.11.0亿年前 (转化为甲基生物),加密生物调解了进一步的塑转移.
结论:
- 原始塑进化的时间比以前估计的要早得多.
- 分子时钟模型,而不是校准套件,是年龄估计变化的主要驱动因素.
- 这项研究为了解真核生物中的光合作用多样化提供了一个强大的进化框架.
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