Recent Evolution in Rattus norvegicus Is Shaped by Declining Effective Population Size

文献类型： 外文期刊

第一作者： Deinum, Eva E.

作者： Deinum, Eva E.;Halligan, Daniel L.;Ness, Rob W.;Keightley, Peter D.;Zhang, Yao-Hua;Zhang, Jian-Xu;Cong, Lin

作者机构：

关键词： Rattus norvegicus;evolutionary adaptation;comparative population genomics;effective population size;bottleneck;distribution of fitness effects;PSMC;DFE-alpha;Illumina whole genome sequencing;Mus musculus castaneus

期刊名称：MOLECULAR BIOLOGY AND EVOLUTION （ 影响因子：16.24； 五年影响因子：18.67 ）

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年卷期：

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收录情况： SCI

摘要： The brown rat, Rattus norvegicus, is both a notorious pest and a frequently used model in biomedical research. By analyzing genome sequences of 12 wild-caught brown rats from their presumed ancestral range in NE China, along with the sequence of a black rat, Rattus rattus, we investigate the selective and demographic forces shaping variation in the genome. We estimate that the recent effective population size (N-e) of this species = 1: 24 x 10(5), based on silent site diversity. We compare patterns of diversity in these genomes with patterns in multiple genome sequences of the house mouse (Mus musculus castaneus), which hasamuch larger N-e. This reveals an important role for variation in the strength of genetic drift in mammalian genome evolution. By a Pairwise Sequentially Markovian Coalescent analysis of demographic history, we infer that there has been a recent population size bottleneck in wild rats, which we date to approximately 20,000 years ago. Consistent with this, wild rat populations have experienced an increased flux of mildly deleterious mutations, which segregate at higher frequencies in protein-coding genes and conserved noncoding elements. This leads to negative estimates of the rate of adaptive evolution (alpha) in proteins and conserved noncoding elements, a result which we discuss in relation to the strongly positive estimates observed in wild house mice. As a consequence of the population bottleneck, wild rats also show a markedly slower decay of linkage disequilibrium with physical distance than wild house mice.

分类号： Q7

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