Abstract
As an important long noncoding RNA, Hox transcript antisense intergenic RNA (HOTAIR) is involved in the development and progression of various carcinomas. However, the role and genetic alterations of HOTAIR in gastric cardia adenocarcinoma (GCA) occurrence and progression have not been elucidated. We performed a case-control study in a population of north China to evaluate the possible association between haplotype-tagging SNPs (htSNPs) of the whole HOTAIR sequence and the risk of GCA as well as functional effect of the susceptibility single nucleotide polymorphism (SNP) rs12826786 on gene expression. The polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) method was used to examine the genotype of htSNPs in 515 GCA patients and 654 control subjects, and the quantitative real-time reverse transcription PCR (RT-PCR) method was used to examine the expression of HOTAIR in 102 GCA patients. A family history of upper gastrointestinal cancer (UGIC) significantly increased the risk of developing GCA. Among three htSNPs of the HOTAIR gene (rs12826786 C>T, rs4759314 A>G, and rs10783618 C>T), only the T allele of rs12826786 was found to increase the risk of developing GCA and was associated with smoking habit and tumor-node-metastasis (TNM) stage. In addition, higher expression levels of HOTAIR were found in tumor tissues and rs12826786 SNP has a genotype-specific effect on HOTAIR expression. A high HOTAIR expression level was associated with poor GCA patients’ survival. These results indicate that functional genotype alteration of rs12826786 SNP may influence the expression of HOTAIR, and HOTAIR may be a useful marker to predict the biological behavior of tumors and potentially a therapeutic target in GCA treatment.
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We thank the cases and control individuals for taking part in this study. This research was supported by the National Natural Science Foundation (No. 81472335).
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Wei Guo and Zhiming Dong contributed equally to this work.
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Guo, W., Dong, Z., Bai, Y. et al. Associations between polymorphisms of HOTAIR and risk of gastric cardia adenocarcinoma in a population of north China. Tumor Biol. 36, 2845–2854 (2015). https://doi.org/10.1007/s13277-014-2912-y
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DOI: https://doi.org/10.1007/s13277-014-2912-y