The identification of an ESCC susceptibility SNP rs920778 that regulates the expression of lncRNA HOTAIR via a novel intronic enhancer.

Abstract

Long noncoding RNA (lncRNA) HOX transcript antisense RNA (HOTAIR), which could induce genome-wide retargeting of polycomb-repressive complex 2, trimethylates histone H3 lysine-27 (H3K27me3) and deregulation of multiple downstream genes, is involved in development and progression of esophageal squamous cell carcinoma (ESCC). We hypothesized that the functional single nucleotide polymorphisms (SNP) in HOTAIR may affect HOTAIR expression and/or its function and, thus, ESCC risk. Therefore, we examined the association between three haplotype-tagging SNPs (htSNP) across the whole HOTAIR locus and ESCC risk as well as the functional relevance of an ESCC susceptibility SNP rs920778. Genotypes were determined in three independent case-control sets consisted of 2098 ESCC patients and 2150 controls. The allele-specific regulation on HOTAIR expression by the rs920778 SNP was investigated in vitro and in vivo. We found that the HOTAIR rs920778 TT carriers had a 1.37-fold, 1.78-fold and 2.08-fold increased ESCC risk in Jinan, Shijiazhuang and Huaian populations, respectively, compared with the CC carriers (P = 0.003, 7.7 × 10(-4) and 5.9 × 10(-4)). During inspecting functional relevance of the rs920778 SNP, we identified a novel intronic HOTAIR enhancer locating between +1719bp and +2353bp from the transcriptional start site through reporter assays. Moreover, there is an allelic regulation of rs920778 on HOTAIR expression via this enhancer in both ESCC cell lines and normal esophageal tissue specimens, with higher HOTAIR expression among T allele carriers. These results demonstrate that functional genetic variants influencing lncRNA regulation may explain a fraction of ESCC genetic basis.

• Authors: Xiaojiao Zhang, Liqing Zhou, Guobin Fu, Fang Sun, Juan Shi, Jinyu Wei, Chao Lu, Changchun Zhou, Qipeng Yuan, Ming Yang
• Journal: Carcinogenesis (Carcinogenesis) Vol. 35 Issue 9 Pg. 2062-7 (Sep 2014) ISSN: 1460-2180 [Electronic] England
• PMID: 24788237 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
• Copyright: © The Author 2014. Published by Oxford University Press. All rights reserved. For Permissions, please email: [email protected].

Chemical References

• HOTAIR long untranslated RNA, human
• RNA, Long Noncoding

Topics

• Carcinoma, Squamous Cell (genetics, metabolism)
• Case-Control Studies
• Cell Line, Tumor
• Enhancer Elements, Genetic
• Esophageal Neoplasms (genetics, metabolism)
• Esophageal Squamous Cell Carcinoma
• Gene Expression Regulation, Neoplastic
• Gene Frequency
• Genetic Association Studies
• Genetic Predisposition to Disease
• Humans
• Introns
• Polymorphism, Single Nucleotide
• RNA, Long Noncoding (genetics, metabolism)
• Risk Factors