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Chromosome aberrations in a schizophrenia population
Osman Demirhan1, Deniz Taştemir
1Faculty of Medicine, Department of Medical Biology and Genetics, Cukurova University, 01330, Balcali, Adana, Turkey. osdemir@mail.cu.edu.tr
Schizophrenia Research
|November 19, 2003
Summary
Cytogenetic abnormalities are common in schizophrenia, with specific chromosomal regions like chromosome 9 potentially linked to increased risk. These findings aid in identifying genetic factors contributing to schizophrenia development.
Area of Science:
- Genetics
- Psychiatry
- Cytogenetics
Background:
- Cytogenetic abnormalities in schizophrenia offer insights into identifying susceptibility loci and major genes.
- Understanding these abnormalities is crucial for advancing schizophrenia research.
Purpose of the Study:
- To investigate the prevalence and types of chromosomal aberrations in a cohort of 134 individuals with schizophrenia.
- To identify specific chromosomal regions or anomalies associated with an increased risk of schizophrenia.
Main Methods:
- Performed chromosomal examinations using the GTG banding technique on 134 schizophrenic patients.
- Analyzed numerical and structural aberrations, including deletions, inversions, and specific chromosome changes.
Main Results:
- Detected random numerical and structural aberrations in 43 patients (32%).
- Structural aberrations, particularly deletions and inversions, were predominant.
- Observed a higher incidence of pericentromic inversion and enlargement of the heterochromatin region of chromosome 9 (inv(9); 9qh+) (5.2%) compared to the general population.
- Identified prevalent chromosomal lesions in schizophrenics, including 1q21, 7q23, inv(9), 9qh+, 11q23, 21q22, 22q11-13, and Xp11-q13.
Conclusions:
- The increased incidence of inv(9) and 9qh+ suggests a potential susceptibility locus for schizophrenia at the pericentromeric region of chromosome 9.
- These chromosomal lesions may increase schizophrenia risk non-specifically by disrupting nervous system development.
- Further research into these cytogenetic abnormalities can refine our understanding of schizophrenia's genetic underpinnings.