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A candidate region for Asperger syndrome defined by two 17p breakpoints
Dmitry Tentler1, Tonnie Johannesson, Maria Johansson
1Department of Genetics and Pathology, Section of Clinical Genetics, The Rudbeck Laboratory, Uppsala University, Uppsala, Sweden.
European Journal of Human Genetics : EJHG
|March 14, 2003
Summary
Two Asperger syndrome patients with chromosome translocations showed breakpoints in the same 17p13 region. This genetic overlap suggests a shared cause for their neurodevelopmental disorder.
Area of Science:
- Genetics
- Neurodevelopmental Disorders
- Molecular Biology
Background:
- Asperger syndrome (AS) is a neurodevelopmental disorder characterized by social interaction impairments and restricted behaviors.
- Genetic factors are implicated in AS, but specific causative genes remain largely unidentified.
- Balanced translocations, such as t(13;17) and t(17;19), can disrupt gene function and contribute to genetic disorders.
Purpose of the Study:
- To investigate the genetic basis of Asperger syndrome in patients with specific chromosomal translocations.
- To identify potential candidate genes located at the translocation breakpoints associated with AS phenotype.
- To analyze gene expression patterns in relation to chromosomal abnormalities.
Main Methods:
- Karyotyping and fluorescent in situ hybridization (FISH) were used to identify and map chromosomal breakpoints.
- Gene expression analysis was performed on lymphoblastoid cell lines using RNA derived from patients and controls.
- Comparative analysis of gene expression levels for genes within the breakpoint regions was conducted.
Main Results:
- Two AS patients with balanced translocations t(13;17) and t(17;19) were identified.
- Chromosome 17 breakpoints in both patients were localized to a 300 kb region at 17p13, spanning 14 known genes.
- Differential gene expression was observed for specific genes, while others showed similar expression levels between translocation-carrying and normal cell lines.
Conclusions:
- The proximity of the 17p breakpoints in both patients suggests a common genetic etiology for their Asperger syndrome phenotype.
- Further structural and functional analysis of genes near the breakpoints may identify candidate sequences responsible for AS.
- This study provides a refined focus for investigating the genetic underpinnings of Asperger syndrome in translocation carriers.