Abstract: Objective To investigate the population genetic data of 3 SNP loci （rs25533, rs34388196 and rs1042173） of 5-hydroxytryptamine transporter （5-HTT） gene and the association with paranoid schizophrenia. Methods Three SNP loci of 5-HTT gene were examined in 132 paranoid schizophrenia patients and 150 unrelated healthy individuals of Northern Chinese Han population by PCR-RFLP technique. The Hardy-Weinberg equilibrium test was performed using the chi-square test and the data of haplotype frequency and population genetics parameters were statistically analyzed. Results Among these three SNP loci, four haplotypes were obtained. There were no statistically significant differences between the patient group and the control group（P>0.05）. The DP values of the 3 SNP loci were 0.276, 0.502 and 0.502. The PIC of them were 0.151, 0.281 and 0.281. The PE of them were 0.014, 0.072 and 0.072. Conclusion The three SNP loci and four haplotypes of 5-HTT gene have no association with paranoid schizophrenia, while the polymorphism still have high potential application in forensic practice.

Key words: forensic genetics, polymorphism, single nucleotide, schizophrenia, 5-hydroxytryptamine transporter