Population differences in microRNA expression and biological implications

R. Stephanie Huang, Eric R. Gamazon, Dana Ziliak, Yujia Wen, Hae Kyung Im, Wei Zhang, Claudia Wing, Shiwei Duan, Wasim K. Bleibel, Nancy J. Cox, M. Eileen Dolan

Research output: Contribution to journalArticlepeer-review

100 Scopus citations

Abstract

Population differences observed for complex traits may be attributed to the combined effect of socioeconomic, environmental, genetic and epigenetic factors. To better understand population differences in complex traits, genome-wide genetic and gene expression differences among ethnic populations have been studied. Here we set out to evaluate population differences in small non-coding RNAs through an evaluation of microRNA (miRNA) baseline expression in HapMap lymphoblastoid cell lines (LCLs) derived from 53 CE U (Utah residents with northern and western European ancestry) and 54 YRI (Yoruba people from Ibadan, Nigeria). Using the Exiqon miRCURY™ LNA arrays, we found that 16% of all miRNAs evaluated in our study differ significantly between these 2 ethnic groups (pBonferroni corrected < 0.05). Furthermore, we explored the potential biological function of these observed differentially expressed miRNAs by comprehensively examining their effect on the transcriptome and their relationship with cellular sensitivity to drug phenotypes. After multiple testing adjustment (false discovery rate (FDR) ≤0.1), we found that 55% and 88% of the differentially expressed miRNAs were significantly and inversely correlated with an mRNA expression phenotype in the CE U and YRI samples, respectively. Interestingly, a substantial proportion (64%) of these miRNAs correlated with cellular sensitivity to chemotherapeutic agents (FDR < 0.05). Lastly, upon performing a genome-wide association study between SNPs and miRNA expression, we identified a large number of SNPs exhibiting different allele frequencies that affect the expression of these differentially expressed miRNAs, suggesting the role of genetic variants in mediating the observed population differences.

Original languageEnglish (US)
JournalRNA biology
Volume8
Issue number4
DOIs
StatePublished - Jan 1 2011

Keywords

  • HapMap
  • Population difference
  • SNP
  • mRNA
  • microRNA expression

ASJC Scopus subject areas

  • Molecular Biology
  • Cell Biology

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