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Human G(olf) gene polymorphisms and vulnerability to bipolar disorder
W H Berrettini1, J Vuoristo, T N Ferraro
1Department of Psychiatry, University of Pennsylvania, Philadelphia 19104, USA. wadeb@mail.med.upenn.edu
Psychiatric Genetics
|December 23, 1998
Summary
Two common genetic variations in the olfactory G-protein alpha subunit (G(olf)) were identified. These intronic polymorphisms may impact gene splicing and function, offering insights into olfactory system genetics.
Area of Science:
- Genetics
- Molecular Biology
- Neuroscience
Background:
- The olfactory G-protein alpha subunit (G(olf)) plays a crucial role in signal transduction in olfactory neurons.
- Intronic variations can affect gene expression and protein function through altered splicing.
- Understanding genetic variations in G(olf) is important for studying olfactory system function and disorders.
Purpose of the Study:
- To identify and characterize intronic polymorphisms in the human G(olf) gene.
- To investigate the potential functional impact of these polymorphisms on gene splicing.
- To assess the prevalence of these variations in a human population.
Main Methods:
- Single-stranded conformational polymorphism (SSCP) analysis was used to detect polymorphisms.
- DNA sequencing was employed to confirm the identified single base pair substitutions.
- Genotyping was performed to determine allele frequencies and assess linkage disequilibrium.
Main Results:
- Two common intronic polymorphisms were identified in G(olf) introns 3 and 10.
- The intron 3 variant (A/G) has a minor allele frequency of 31% and may create a cryptic splice site.
- The intron 10 variant (T/G) has a minor allele frequency of 16% and affects the polypyrimidine tract of a 3' splice site.
Conclusions:
- The identified G(olf) intronic polymorphisms are relatively common in the studied population.
- The intron 3 variant has the potential to alter G(olf) protein structure by adding residues.
- The intron 10 variant's position within the polypyrimidine tract suggests a potential for aberrant splicing, similar to mechanisms seen in other genes.