en
Scientific article
Open access
English

Cis and trans effects of human genomic variants on gene expression

Published inPLOS genetics, vol. 10, no. 7, e1004461
Publication date2014
Abstract

Gene expression is a heritable cellular phenotype that defines the function of a cell and can lead to diseases in case of misregulation. In order to detect genetic variations affecting gene expression, we performed association analysis of single nucleotide polymorphisms (SNPs) and copy number variants (CNVs) with gene expression measured in 869 lymphoblastoid cell lines of the Avon Longitudinal Study of Parents and Children (ALSPAC) cohort in cis and in trans. We discovered that 3,534 genes (false discovery rate (FDR) = 5%) are affected by an expression quantitative trait locus (eQTL) in cis and 48 genes are affected in trans. We observed that CNVs are more likely to be eQTLs than SNPs. In addition, we found that variants associated to complex traits and diseases are enriched for trans-eQTLs and that trans-eQTLs are enriched for cis-eQTLs. As a variant affecting both a gene in cis and in trans suggests that the cis gene is functionally linked to the trans gene expression, we looked specifically for trans effects of cis-eQTLs. We discovered that 26 cis-eQTLs are associated to 92 genes in trans with the cis-eQTLs of the transcriptions factors BATF3 and HMX2 affecting the most genes. We then explored if the variation of the level of expression of the cis genes were causally affecting the level of expression of the trans genes and discovered several causal relationships between variation in the level of expression of the cis gene and variation of the level of expression of the trans gene. This analysis shows that a large sample size allows the discovery of secondary effects of human variations on gene expression that can be used to construct short directed gene regulatory networks.

Keywords
  • Cell Line, Tumor
  • DNA Copy Number Variations/genetics
  • Gene Expression Regulation/genetics
  • Gene Regulatory Networks
  • Genetic Association Studies
  • Genome, Human
  • Genomics
  • Humans
  • Phenotype
  • Polymorphism, Single Nucleotide/genetics
  • Quantitative Trait Loci/genetics
Citation (ISO format)
BRYOIS, Julien et al. Cis and trans effects of human genomic variants on gene expression. In: PLOS genetics, 2014, vol. 10, n° 7, p. e1004461. doi: 10.1371/journal.pgen.1004461
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Article (Published version)
Identifiers
ISSN of the journal1553-7390
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160downloads

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