Genomic signatures of inbreeding and mutation load in a threatened rattlesnake
Genomic signatures of inbreeding and mutation load in a threatened rattlesnake
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受威胁响尾蛇近亲繁殖和突变负荷的基因组特征
DOI:
10.1111/mec.16147
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发表时间:
2021
影响因子:
4.9
通讯作者:
Gibbs, H. Lisle
中科院分区:
文献类型:
--
作者:
Ochoa, Alexander;Gibbs, H. Lisle
Theory predicts that threatened species living in small populations will experience high levels of inbreeding that will increase their genetic load, but recent work suggests that the impact of load may be minimized by purging resulting from long‐term population bottlenecks. Empirical studies that examine this idea using genome‐wide estimates of inbreeding and genetic load in threatened species are limited. Here we use individual genome resequencing data to compare levels of inbreeding, levels of genetic load (estimated as mutation load) and population history in threatened Eastern massasauga rattlesnakes (Sistrurus catenatus), which exist in small isolated populations, and closely related yet outbred Western massasauga rattlesnakes (Sistrurus tergeminus). In terms of inbreeding,S.catenatusgenomes had a greater number of runs of homozygosity of varying sizes, indicating sustained inbreeding through repeated bottlenecks when compared toS.tergeminus. At the species level, outbredS.tergeminushad higher genome‐wide levels of mutation load in the form of greater numbers of derived deleterious mutations compared toS.catenatus, presumably due to long‐term purging of deleterious mutations inS.catenatus. In contrast, mutations that escaped species‐level drift effects withinS.catenatuspopulations were in general more frequent and more often found in homozygous genotypes than inS.tergeminus, suggesting a reduced efficiency of purifying selection in smallerS.catenatuspopulations for most mutations. Our results support an emerging idea that the historical demography of a threatened species has a significant impact on the type of genetic load present, which impacts implementation of conservation actions such as genetic rescue.
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影响因子:
0.7
作者:
Wade A. Ryberg;Johanna A. Harvey;A. Blick;Toby J. Hibbitts;G. Voelker
通讯作者:
G. Voelker
影响因子:
5
作者:
Kyriazis CC;Wayne RK;Lohmueller KE
通讯作者:
Lohmueller KE
影响因子:
5.8
作者:
Simao, Felipe A.;Waterhouse, Robert M.;Zdobnov, Evgeny M.
通讯作者:
Zdobnov, Evgeny M.
DOI:
--
发表时间:
1998
期刊:
影响因子:
--
作者:
Robert C. Stebbins
通讯作者:
Robert C. Stebbins
影响因子:
5.8
作者:
Chirag Jain;S. Koren;A. Dilthey;A. Phillippy;S. Aluru
通讯作者:
Chirag Jain;S. Koren;A. Dilthey;A. Phillippy;S. Aluru