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Selection signature reveals genes associated with susceptibility loci affecting respiratory disease due to pleiotropic and hitchhiking effect in Chinese indigenous pigs

  • Xu, Zhong (Department of Animal Science, School of Agriculture and Biology, Shanghai Jiao Tong University) ;
  • Sun, Hao (Department of Animal Science, School of Agriculture and Biology, Shanghai Jiao Tong University) ;
  • Zhang, Zhe (Department of Animal Science, School of Agriculture and Biology, Shanghai Jiao Tong University) ;
  • Zhang, Cheng-Yue (Department of Animal Science, School of Agriculture and Biology, Shanghai Jiao Tong University) ;
  • Zhao, Qing-bo (Department of Animal Science, School of Agriculture and Biology, Shanghai Jiao Tong University) ;
  • Xiao, Qian (Department of Animal Science, School of Agriculture and Biology, Shanghai Jiao Tong University) ;
  • Olasege, Babatunde Shittu (Department of Animal Science, School of Agriculture and Biology, Shanghai Jiao Tong University) ;
  • Ma, Pei-Pei (Department of Animal Science, School of Agriculture and Biology, Shanghai Jiao Tong University) ;
  • Zhang, Xiang-Zhe (Department of Animal Science, School of Agriculture and Biology, Shanghai Jiao Tong University) ;
  • Wang, Qi-Shan (Department of Animal Science, School of Agriculture and Biology, Shanghai Jiao Tong University) ;
  • Pan, Yu-Chun (Department of Animal Science, School of Agriculture and Biology, Shanghai Jiao Tong University)
  • Received : 2018.09.03
  • Accepted : 2019.01.14
  • Published : 2020.02.01

Abstract

Objective: Porcine respiratory disease is one of the most important health problems causing significant economic losses. To understand the genetic basis for susceptibility to swine enzootic pneumonia (EP) in pigs, we detected 102,809 single nucleotide polymorphisms in a total of 249 individuals based on genome-wide sequencing data. Methods: Genome comparison of susceptibility to swine EP in three pig breeds (Jinhua, Erhualian, and Meishan) with two western lines that are considered more resistant (Duroc and Landrace) using cross-population extended haplotype homozygosity and F-statistic (FST) statistical approaches identified 691 positively selected genes. Based on quantitative trait loci, gene ontology terms and literature search, we selected 14 candidate genes that have convincible biological functions associated with swine EP or human asthma. Results: Most of these genes were tested by several methods including transcription analysis and candidate genes association study. Among these genes: cytochrome P450 1A1 and catenin beta 1 (CTNNB1) are involved in fertility; transforming growth factor beta receptor 3 plays a role in meat quality traits; Wnt family member 2, CTNNB1 and transcription factor 7 take part in adipogenesis and fat deposition simultaneously; plasminogen activator, urokinase receptor (completely linked to AXL receptor tyrosine kinase, r2 = 1) plays an essential role in the successful ovulation of matured oocytes in pigs; colipase like 2 (strongly linked to SAM pointed domain containing ETS transcription factor, r2 = 0.848) is involved in male fertility. Conclusion: These adverse genes susceptible to swine EP may be selected while selecting for economic traits (especially reproduction traits) due to pleiotropic and hitchhiking effect of linked genes. Our study provided a completely new point of view to understand the genetic basis for susceptibility or resistance to swine EP in pigs thereby, provides insight for designing sustainable breed selection programs. Finally, the candidate genes are crucial due to their potential roles in respiratory diseases in a large number of species, including human.

Acknowledgement

Supported by : National Natural Science Foundation of China

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