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《科学》 第391卷 第6789期 · 2026年3月5日 · 中文解读

摆脱瓶颈:考拉遗传恢复的人口统计学路径

Escaping bottlenecks: The demographic path to genetic recovery in koalas (Phascolarctos cinereus) · C. W. Ahrens et al.
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基于418只考拉的全基因组数据,研究发现经历瓶颈后快速扩张的维多利亚州种群正在恢复遗传多样性,并减少突变负荷,而北部种群则面临遗传多样性下降和突变负荷增加的风险。
原文开头
Collin W. Ahrens1*, Adam D. Miller1,2, Luke W. Silver3,4, Elspeth A. McLennan3, Carolyn J. Hogg3, Andrew R. Weeks1,5 Population bottlenecks can lead to evolutionary dead ends by eroding genetic diversity and intensifying inbreeding. Although theory predicts possible escape routes, direct observations of this process are rare. Using whole-genome data from 418 koalas, we found that populations with higher genetic diversity harbored the greatest mutational loads and had declining effective population sizes (Ne), whereas historically bottlenecked but recovering populations displayed reduced mutational load, exhibited increasing Ne, and regenerated new, rare variants. We concluded that this pattern was due to rapid demographic expansion, which reshuffled genetic variation through recombination and affected Ne more quickly than it did conventional diversity metrics. …
摘自《科学》(Science)第391卷 第6789期 · 2026年3月5日,C. W. Ahrens et al.。仅引用开头一小段供了解文章,版权归原刊所有,全文请阅读原刊。
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