Abstract
Background LncRNA MEG3 expressed abnormally in various cancers including breast cancer, but no studies reported the correlation between MEG3 SNPs and breast cancer susceptibility. Methods This study is aimed to explore the association between three SNPs of MEG3 (rs3087918, rs7158663, rs11160608) and breast cancer. The study is a population-based case-control study including 434 breast cancer patients and 700 healthy controls. Genotyping was performed using Sequence MassArray technique. Function prediction of rs3087918 were based on RNAfold and lncRNASNP2 databases. Results Pooled analysis indicated that rs3087918 was related to a decreased risk of breast cancer (GG vs. TT: P = 0.042; GG vs. TT + TG: P = 0.046), especially for women aged 49 and above (GG vs. TT: P = 0.02). Comparison between case groups showed genotype GG and TG/GG of rs3087918 were correlated with her-2 receptor expression (GG vs. TT: P = 0.010; TG + GG vs. TT: P = 0.045). We didn’t find statistical significance for rs11160608, rs7158663 and breast cancer. Structure prediction based on RNAfold found rs3087918 may influence the secondary structure of MEG3. The results based on lncRNASNP2 indicated rs3087918 may gain the targets of hsa-miR-1203 to MEG3, while loss the target of hsa-miR-139-3p and hsa-miR-5091 to MEG3. Conclusions MEG3 rs3087918 was associated with a decreased risk of breast cancer. MEG3 haplotype TCG (SNP sequence: rs3087918, rs11160608, rs7158663) may increase the risk of breast cancer. And the protest effect of rs3087918 on breast cancer may owe to its effect on the structure and function of MEG3.
Significant association between ERCC2 and MTHR polymorphisms and breast cancer susceptibility in Moroccan population: genotype and haplotype analysis in a case-control study