HTR2C promoter polymorphisms are associated with risperidone efficacy in Chinese female patients.
OBJECTIVE
A number of studies demonstrate that the polymorphisms in the 5 region of HTR2C play a pivotal role in antipsychotic drug efficacy. Since risperidone is an antagonist of HTR2C, polymorphic variations in HTR2C may explain variability in response to risperidone treatment. We analyzed HTR2C polymorphisms for association with efficacy of risperidone monotherapy.


METHODS
We genotyped five SNPs distributed throughout the HTR2C gene and examined them for association using the Brief Psychiatric Rating Scale score in 130 Chinese schizophrenic patients following an 8-week period of risperidone monotherapy. All the patients were receiving the atypical antipsychotic drug treatment for the first time and had a 4-week medication-free period before research began.


RESULTS
We found rs518147, rs1023574 and rs9698290 were significantly associated with risperidone treatment in female patients (F = 4.75, degrees of freedom = 2 and p = 0.011; F = 4.329, degrees of freedom = 2 and p = 0.016; F = 4.188, degrees of freedom = 2 and p = 0.019, respectively) and they were also found to be in one linkage disequilibrium block.


CONCLUSIONS
Our results indicate that variants in the HTR2C promoter region are likely to affect the risperidone therapeutic effect in female mainland patients. It may be helpful to investigate a combination of other clinical factors to predict atypical antipsychotic efficacy.
Liu
Bao-Cheng
BC
Bio-X Center, Key Laboratory for the Genetics of Developmental & Neuropsychiatric Disorders (Ministry of Education), Shanghai Jiao Tong University, Shanghai, PR China.
Zhang
Jing
J
Wang
Lei
L
Li
Xing-Wang
XW
Wang
Yang
Y
Wei
Zhi-Yun
ZY
Ji
Jue
J
Yang
Feng-Ping
FP
Wan
Chun-Ling
CL
Xu
Yi-Feng
YF
Feng
Guo-Yin
GY
He
Lin
L
He
Guang
G
D000328:Adult; D014150:Antipsychotic Agents / Q000627:therapeutic use*; D044466:Asian People / Q000235:genetics; D010054:Brief Psychiatric Rating Scale; D005260:Female; D017353:Gene Deletion; D005838:Genotype; D006801:Humans; D015810:Linkage Disequilibrium; D008875:Middle Aged; D011110:Polymorphism, Genetic; D020641:Polymorphism, Single Nucleotide; D012045:Regulatory Sequences, Nucleic Acid; D018967:Risperidone / Q000627:therapeutic use*
D014150:Antipsychotic Agents; D018967:Risperidone