Fine Mapping of the MHC Region Identifies Novel Variants Associated with HBV-Related Hepatocellular Carcinoma in Han Chinese

作者：Mai, Haoming; Chen, Jiaxuan; Chen, Haitao; Liu, Zhiwei; Huang, Guanlin; Wang, Jialin; Xiao, Qianyi; Ren, Weihua; Zhou, Bin; Hou, Jinlin^*; Jiang, Deke^*

来源：Journal of Hepatocellular Carcinoma, 2021, 8: 951-961.

DOI：10.2147/JHC.S321919

• fine mapping
• susceptibility
• MHC
• hepatocellular carcinoma
• HBV

Introduction: Genome-wide association studies identified susceptibility loci in the major histocompatibility complex region for hepatitis B virus (HBV)-related hepatocellular carcinoma (HCC). However, the causal variants underlying HBV-related HCC pathogenesis remain elusive. @@@ Methods: With a total of 1,161 HBV-related HCC cases and 1,353 chronic HBV carriers without HCC, we imputed human leukocyte antigen (HLA) variants based on a Chinese HLA reference panel and evaluated the associations of these variants with the risk of HBV-related HCC. Conditional analyses were used to identify independent signals associated with the risk of HBV-related HCC (P false-discovery rate (FDR) <0.20). A total of 14,930 variants within the MHC region were genotyped or imputed. @@@ Results: We identified two variants, rs114401688 (P = 1.05 x 10(-6), P-FDR = 2.43 x 10(-3)) and rs115126566 (P = 9.04 x 10(-5), PFDR = 1.77 x 10(-1)), that are independently associated with the risk of HBV-related HCC. Single nucleotide polymorphism (SNP) rs114401688 is in linkage disequilibrium with a previously reported SNP rs9275319. In the current study, we found that its association with HCC could be explained by HLA-DQB1*04 and HLA-DRB1*04. SNP rs115126566 is a novel risk variant and may function by regulating transcriptions of HLA-DPA1/DPB1 through enhancer-mediated mechanisms. HLA zygosity analysis showed that homozygosity at HLA-DQB1 gene is suggestively associated with a higher risk of HCC (P = 0.10) and the risk was more pronounced in the older age group (age >= 50, P = 0.03). @@@ Discussion: Our findings further the understanding of the genetic basis for HBV-related HCC predisposition in chronic HBV carriers.

• 单位
  南方医科大学; 1; 中山大学; 复旦大学