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Genome-Wide Association Analysis for Blood Lipid Traits Measured in Three Pig Populations Reveals a Substantial Level of Genetic Heterogeneity

Author

Listed:
  • Hui Yang
  • Xiaochang Huang
  • Zhijun Zeng
  • Wanchang Zhang
  • Chenlong Liu
  • Shaoming Fang
  • Lusheng Huang
  • Congying Chen

Abstract

Serum lipids are associated with myocardial infarction and cardiovascular disease in humans. Here we dissected the genetic architecture of blood lipid traits by applying genome-wide association studies (GWAS) in 1,256 pigs from Laiwu, Erhualian and Duroc × (Landrace × Yorkshire) populations, and a meta-analysis of GWAS in more than 2,400 pigs from five diverse populations. A total of 22 genomic loci surpassing the suggestive significance level were detected on 11 pig chromosomes (SSC) for six blood lipid traits. Meta-analysis of GWAS identified 5 novel loci associated with blood lipid traits. Comparison of GWAS loci across the tested populations revealed a substantial level of genetic heterogeneity for porcine blood lipid levels. We further evaluated the causality of nine polymorphisms nearby or within the APOB gene on SSC3 for serum LDL-C and TC levels. Of the 9 polymorphisms, an indel showed the most significant association with LDL-C and TC in Laiwu pigs. But the significant association was not identified in the White Duroc × Erhualian F2 resource population, in which the QTL for LDL-C and TC was also detected on SSC3. This indicates that population-specific signals may exist for the SSC3 QTL. Further investigations are warranted to validate this assumption.

Suggested Citation

  • Hui Yang & Xiaochang Huang & Zhijun Zeng & Wanchang Zhang & Chenlong Liu & Shaoming Fang & Lusheng Huang & Congying Chen, 2015. "Genome-Wide Association Analysis for Blood Lipid Traits Measured in Three Pig Populations Reveals a Substantial Level of Genetic Heterogeneity," PLOS ONE, Public Library of Science, vol. 10(6), pages 1-15, June.
    • Handle: RePEc:plo:pone00:0131667
    DOI: 10.1371/journal.pone.0131667
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