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Autism spectrum disorder (ASD) is a group of neurodevelopmental disorders with a strong genetic component. Many lines of evidence indicated that ASD shares common genetic variants with other psychiatric disorders (for example, schizophrenia). Previous studies detected that calcium channels are involved in the etiology of many psychiatric disorders including schizophrenia and autism. Significant association between  CACNA1C  (calcium channel, voltage-dependent, L type, alpha 1C subunit) and schizophrenia was detected. Furthermore, rare mutation in  CACNA1C  is suggested to cause Timothy syndrome, a multisystem disorder including autism-associated phenotype. However, there is no evidence for association between  CACNA1C  and autism in Chinese Han population. To investigate the association between single nucleotide polymorphisms (SNP) in  CACNA1C  and autism, we first performed a family-based association study between eighteen SNPs in  CACNA1C  and autism in 239 trios. All SNPs were genotyped by using Sequenom genotyping platform. Two SNPs (rs1006737 and rs4765905) have a trend of association with autism. To further confirm the association between these two SNPs with autism, we expanded the sample size to 553 trios by adding 314 trios. Association analyses for SNPs and haplotype were performed by using family-based association test (FBAT) and Haploview software. Permutation tests were used for multiple testing corrections of the haplotype analyses (n=10,000). The significance level for all statistical tests was two-tailed ( p <0.05). The results demonstrated that G allele of rs1006737 and G allele of rs4765905 showed a preferential transmission to affected offspring in 553 trios ( p =0.035). Haplotype analyses showed that two haplotypes constructed from rs1006737 and rs4765905 were significantly associated with autism ( p =0.030, 0.023, respectively; Global  p =0.046). These results were still significant after permutation correction (n=10,000,  p =0.027). Our research suggests that  CACNA1C  might play a role in the genetic etiology of autism in Chinese Han population.

Schizophrenia Related Variants in CACNA1C also Confer Risk of Autism