Association study of the trinucleotide repeat polymorphism within SMARCA2 and schizophrenia
Sarojini Sengupta1, Lan Xiong, Ferid Fathalli
1Department of Human Genetics, McGill University, Montreal, Canada. sarojini.sengupta@douglas.mcgill.ca
This study investigated the trinucleotide repeat polymorphism in the SMARCA2 gene and its association with schizophrenia. Researchers found no significant link between this specific genetic variation and schizophrenia in multiple population groups.
Area of Science:
- Genetics
- Neuroscience
- Molecular Biology
Background:
- The Brahma (BRM) protein is a crucial component of the SWI/SNF chromatin remodeling complex.
- A polymorphic trinucleotide repeat in the BRM-encoding gene (SMARCA2) is the only known coding region polymorphism.
- SMARCA2 was selected due to its role in developmental pathways and high brain expression, with prior hints of schizophrenia association.
Purpose of the Study:
- To investigate the association between the SMARCA2 trinucleotide repeat polymorphism and schizophrenia.
- To determine if this genetic variation contributes to schizophrenia susceptibility.
Main Methods:
- A family-based association study using 281 triads.
- A case-control study involving 289 schizophrenia cases and 273 controls across three Caucasian populations (French Canadian, Tunisian, European).
Main Results:
- Family-based analysis revealed no significant preferential transmission of SMARCA2 alleles to affected offspring.
- Case-control analysis showed similar allele and genotype distributions between schizophrenia patients and controls in all studied populations.
Conclusions:
- The trinucleotide repeat polymorphism within the SMARCA2 gene is not associated with schizophrenia.
- These findings suggest SMARCA2 polymorphism does not play a significant role in the etiology of schizophrenia.
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