Psychiatry Investig.  2009 Mar;6(1):39-43.

G-protein beta3 Subunit Gene 825C/T Polymorphism Is Not Associated with Olanzapine-Induced Weight Gain in Korean Schizophrenic Patients

  • 1Department of Psychiatry, Inje University College of Medicine, Goyang, Korea.
  • 2Department of Psychiatry, Korea University College of Medicine, Seoul, Korea.
  • 3Division of Brain Korea 21 Biomedical Science, Korea University College of Medicine, Seoul, Korea.


Weight gain is a possible adverse effect of the use of antipsychotics, and is an important factor for long-term health and treatment compliance. Olanzapine is an atypical antipsychotic known to cause considerable weight gain. A relationship between weight gain and the G protein beta3 subunit gene (GNB3) 825C/T polymorphism has been reported. We therefore examined this possible association in a Korean schizophrenic patient group receiving olanzapine treatment. METHODS: Weight and height measurements were obtained prior to starting olanzapine and measured again after long-term treatment. Genotyping for the 825C/T polymorphism was performed using a PCR-based method. RESULTS: We found that long-term treatment with olanzapine resulted in mean gains in weight and body mass index (BMI) of 5.2 kg and 1.93 kg/m2, respectively. There was a no significant difference in the mean body weight change from baseline to the endpoint after olanzapine treatment between the genotype groups (p=0.796). There were also no significant differences in genotype or allele frequencies between the severe weight-gain (more than 10%) and minimal weight-gain (less than 10%) groups (chi-square=0.037, p=0.98; chi-square=0.020, p=0.89). CONCLUSION: The finding from this study thus does not support a relationship between the GNB3 825C/T polymorphism and weight gain in Korean schizophrenic patients receiving olanzapine treatment.


Olanzapine; Weight; Polymorphism; Schizophrenia

MeSH Terms

Antipsychotic Agents
Body Mass Index
Body Weight Changes
Gene Frequency
GTP-Binding Proteins
Heterotrimeric GTP-Binding Proteins
Weight Gain
Antipsychotic Agents
GTP-Binding Proteins
Heterotrimeric GTP-Binding Proteins
Full Text Links
  • PI
export Copy
  • Twitter
  • Facebook
Similar articles
    DB Error: unknown error