Abstract
Synaptic plasticity markers are known to alter in schizophrenia. The objective of the study was to investigate the genotype and allele frequency of neurotrophin-3 (NT-3) gene polymorphism (rs6489630, rs6332, and rs11063714) and plasma NT-3 levels in schizophrenia and their relation with cognitive status. The study was conducted on 216 Schizophrenia patients and 216 controls. Single-nucleotide polymorphism (SNP) of NT-3 and its plasma levels were assessed in both groups. Cognitive status was evaluated using Addenbrooke Cognitive examination-III scores. The rs6489630 polymorphism was found to be significantly associated with the severity of schizophrenia (P = 0.004). The CT genotype (P = 0.02, OR = 1.631 [1.10-2.43]) and minor allele T (P = 0.004, OR = 1.58 [1.16-2.16]) of rs6489630 conferred an increased susceptibility to develop schizophrenia. The rs6332 variant was found to affect cognitive status significantly in schizophrenia (P = 0.040), and memory dysfunction was seen in individuals with AG (P < 0.01) and AA variant (P = 0.03) of rs6332. We conclude that SNPs of NT-3 enhance the risk of schizophrenia and are related to cognitive dysfunction.
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