Abstract
The SLC6A3 and SLC6A4 genes are members of a class of neurotransmitter transporters for the release, re-uptake and recycling of neurotransmitters in synapses. SLC6A3 and SLC6A4 encode a dopamine transporter and serotonin transporter, respectively. Abnormal expression and genetic polymorphism of SLC6A3 and SLC6A4 genes may increase the risk of developing mental illness, such as schizophrenia, bipolar disorder, ADHD, and aggressive behavior in Alzheimer disease, etc. Nevertheless, association between SLC6A3, SLC6A4 genes polymorphism and schizophrenia patients have not been well studied in Han Chinese people. In this study, we examined whether single nucleotide polymorphisms (SNPs) in SLC6A3, SLC6A4 were associated with schizophrenia in Han Chinese people (893 schizophrenia patients and 611 healthy controls). No significant difference in allelic or genotypic frequency was found between schizophrenia patients and healthy controls. No positive linkage disequilibrium (LD) was detected either. No haplotypic distributions were positive. Accordingly, our study suggests that the 10 SNPs within both genes we examined do not play a major role in schizophrenia in the Han Chinese population.
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