Linking short tandem repeat polymorphisms with cytosine modifications in human lymphoblastoid cell lines.

Published

Journal Article

Inter-individual variation in cytosine modifications has been linked to complex traits in humans. Cytosine modification variation is partially controlled by single nucleotide polymorphisms (SNPs), known as modified cytosine quantitative trait loci (mQTL). However, little is known about the role of short tandem repeat polymorphisms (STRPs), a class of structural genetic variants, in regulating cytosine modifications. Utilizing the published data on the International HapMap Project lymphoblastoid cell lines (LCLs), we assessed the relationships between 721 STRPs and the modification levels of 283,540 autosomal CpG sites. Our findings suggest that, in contrast to the predominant cis-acting mode for SNP-based mQTL, STRPs are associated with cytosine modification levels in both cis-acting (local) and trans-acting (distant) modes. In local scans within the ±1 Mb windows of target CpGs, 21, 9, and 21 cis-acting STRP-based mQTL were detected in CEU (Caucasian residents from Utah, USA), YRI (Yoruba people from Ibadan, Nigeria), and the combined samples, respectively. In contrast, 139,420, 76,817, and 121,866 trans-acting STRP-based mQTL were identified in CEU, YRI, and the combined samples, respectively. A substantial proportion of CpG sites detected with local STRP-based mQTL were not associated with SNP-based mQTL, suggesting that STRPs represent an independent class of mQTL. Functionally, genetic variants neighboring CpG-associated STRPs are enriched with genome-wide association study (GWAS) loci for a variety of complex traits and diseases, including cancers, based on the National Human Genome Research Institute (NHGRI) GWAS Catalog. Therefore, elucidating these STRP-based mQTL in addition to SNP-based mQTL can provide novel insights into the genetic architectures of complex traits.

Full Text

Duke Authors

Cited Authors

  • Zhang, Z; Zheng, Y; Zhang, X; Liu, C; Joyce, BT; Kibbe, WA; Hou, L; Zhang, W

Published Date

  • February 2016

Published In

Volume / Issue

  • 135 / 2

Start / End Page

  • 223 - 232

PubMed ID

  • 26714498

Pubmed Central ID

  • 26714498

Electronic International Standard Serial Number (EISSN)

  • 1432-1203

Digital Object Identifier (DOI)

  • 10.1007/s00439-015-1628-4

Language

  • eng

Conference Location

  • Germany