Related Experiment Videos
Variation at the MJD locus in the major psychoses
Q Saleem1, M Vijayakumar, M Mutsuddi
1Molecular Biophysics Unit, Indian Institute of Science, Bangalore.
American Journal of Medical Genetics
|October 1, 1998
Summary
Triplet repeat expansions are linked to anticipation disorders. This study investigated Machado-Joseph disease (MJD) locus repeat sizes in major psychosis patients, finding subtle size differences that may be functionally significant.
Area of Science:
- Genetics
- Neuroscience
- Psychiatry
Background:
- Triplet repeat expansions are known causes of genetic disorders exhibiting anticipation.
- Clinical observations suggest anticipation may also occur in major psychotic disorders.
Purpose of the Study:
- To investigate the distribution of triplet repeat sizes at the Machado-Joseph disease (MJD) locus in patients diagnosed with major psychoses.
- To determine if MJD locus alleles are expanded in individuals with major psychoses.
Main Methods:
- Genomic DNA analysis was performed on a cohort of patients with major psychoses.
- Triplet repeat lengths at the MJD locus were quantified and compared to control samples.
Main Results:
- No large triplet repeat expansions were detected in the patient group.
- Two patients presented alleles that were two repeats larger than the control group's average.
- The variation in allele sizes was greater within the patient sample compared to controls.
Conclusions:
- While large expansions were not found, subtle increases in MJD locus repeat size were observed in some major psychosis patients.
- These minor allele size differences warrant further investigation for potential functional significance in the pathogenesis of major psychoses.