文献类型：期刊文献

英文题名：Major Histocompatibility Complex (MHC) Diversity of the Reintroduction Populations of Endangered Przewalski's Horse

作者：Tang, Yongqing[1] Liu, Gang[2] Zhao, Shasha[1] Li, Kai[1] Zhang, Dong[1] Liu, Shuqiang[1] Hu, Defu[1]

第一作者：Tang, Yongqing

通信作者：Hu, DF[1];Liu, G[2]

机构：[1]Beijing Forestry Univ, Coll Ecol & Nat Conservat, Beijing 100085, Peoples R China;[2]Chinese Acad Forestry, Beijing Key Lab Wetland Serv & Restorat, Inst Wetland Res, Beijing 100091, Peoples R China

年份：2022

卷号：13

期号：5

外文期刊名：GENES

收录：;Scopus(收录号：2-s2.0-85131101126);WOS:【SCI-EXPANDED(收录号:WOS:000801398000001)】；

基金：This research was funded by National Natural Science Foundation of China (to D.F.H.), grant number 31872962 and the Biodiversity Survey, Monitoring and Assessment Project (2019-2023) of the Ministry of Ecology and Environment, China (No. 2019HB2096001006).

语种：英文

外文关键词：Przewalski's horse; major histocompatibility complex (MHC); reintroduction; genetic diversity; single strand conformation polymorphism (SSCP); DQA genes

摘要：Major histocompatibility complex (MHC) genes are the most polymorphic in vertebrates and the high variability in many MHC genes is thought to play a crucial role in pathogen recognition. The MHC class II locus DQA polymorphism was analyzed in the endangered Przewalski's horse, Equus przewalskii, a species that has been extinct in the wild and all the current living individuals descend from 12 founders. We used the polymerase chain reaction-single strand conformation polymorphism (PCR-SSCP) to detect the polymorphism within the MHC DQA in 31 Przewalski's horses from two reintroduced populations. Consequently, only seven alleles were identified, with only four presenting in each population. In comparison with other mammals, the Przewalski's horse demonstrated less MHC variation. The nucleotide genetic distance of the seven ELA-DQA alleles was between 0.012 and 0.161. The Poisson corrected amino acid genetic distance of the founded alleles was 0.01-0.334. The allele and genotype frequencies of both reintroduced populations of Przewalski's horse deviated from the Hardy-Weinberg equilibrium. Specific MHC DQA alleles may have been lost during the extreme bottleneck event that this species underwent throughout history. We suggest the necessity to detect the genetic background of individuals prior to performing the reintroduction project.