Association Between CACNA1C Polymorphisms and Insomnia in a Chinese Han Population: A Case-Control Population-Based Analysis
Abstract A limited number of genome-wide association studies (GWAS) have shown that CACNA1C is a potential candidate gene for insomnia. The present study sought to investigate the association of CACNA1C gene polymorphisms and insomnia in a Chinese Han population. Twenty-one single nucleotide polymorphisms (SNPs) in the CACNA1C were genotyped by using matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF MS) with a Sequenom MassARRAY system in 205 patients with insomnia and 154 healthy controls. Data from all participants were systematically collected. Association of the polymorphisms with insomnia was evaluated by statistical analysis. Linkage disequilibrium (LD) and haplotype analysis were performed with Haploview v4.2 software. After adjustment for multiple comparisons and gender, age, body mass index (BMI), hypertension and glycated hemoglobin (HbA1c), only the rs2302729 in the recessive model (adjusted odds ratio [AOR]= 0.414, 95%CI= 0.220-0.771, P= 0.004) related to insomnia achieved significance by the false discovery rate (FDR) Benjamini and Hochberg (BH) criterion. The haplotypes rs2302729-rs1051375, CA and TG were significantly associated with insomnia (P<0.05). Our findings contributed important evidence for the confirming of CACNA1C as a susceptibility gene for insomnia in the samples of Chinese Han population.