Genome-wide detections for runs of homozygosity and selective signatures reveal novel candidate genes under domestication in chickens

文献类型： 外文期刊

第一作者： Tan, Xiaodong

作者： Tan, Xiaodong;Dong, Jie;Huang, Minjie;Zhang, Jiawen;Zhou, Zhenzhen;Wang, Deqian;Liu, Lu;Li, Weifen;Liu, Lu;Xiang, Yun;Li, Qinghai;Wang, Huanhuan;Bai, Lijuan;Cui, Ming;Wu, De

作者机构：

关键词： Indigenous chickens; Genomic inbreeding; Runs of homozygosity; Selective signature; Transcriptome; VSTM2A

期刊名称：BMC GENOMICS （ 影响因子：4.4； 五年影响因子：4.7 ）

ISSN： 1471-2164

年卷期： 2024 年 25 卷 1 期

页码：

收录情况： SCI

摘要： Background Indigenous chickens were developed through a combination of natural and artificial selection; essentially, changes in genomes led to the formation of these modern breeds via admixture events. However, their confusing genetic backgrounds include a genomic footprint regulating complex traits, which is not conducive to modern animal breeding. Results To better evaluate the candidate regions under domestication in indigenous chickens, we considered both runs of homozygosity (ROHs) and selective signatures in 13 indigenous chickens. The genomes of Silkie feather chickens presented the highest heterozygosity, whereas the highest inbreeding status and ROH number were found in Luhua chickens. Short ROH (< 1 Mb), were the principal type in all chickens. A total of 291 ROH islands were detected, and QTLdb mapping results indicated that body weight and carcass traits were the most important traits. An ROH on chromosome 2 covering VSTM2A gene was detected in 12 populations. Combined analysis with the Tajima's D index revealed that 18 genes (e.g., VSTM2A, BBOX1, and RYR2) were under selection and covered by ROH islands. Transcriptional analysis results showed that RYR2 and BBOX1 were specifically expressed in the heart and muscle tissue, respectively. Conclusion Based on genome-wide scanning for ROH and selective signatures, we evaluated the genomic characteristics and detected significant candidate genes covered by ROH islands and selective signatures. The findings in this study facilitated the understanding of genetic diversity and provided valuable insights for chicken breeding and conservation strategies.

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