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Array-based DNA methylation analysis in individuals with developmental delay/intellectual disability and normal
Julia Kolarova1, Imke Tangen1, Susanne Bens1
1Institute of Human Genetics, Christian-Albrechts-University Kiel & University Hospital Schleswig-Holstein, Campus Kiel, Kiel, Germany.
European Journal of Medical Genetics
|May 25, 2015
Summary
Intellectual disability (ID) causes remain unknown in many. DNA methylation changes, particularly in imprinting disorders, may be a key factor in ID pathogenesis, suggesting new diagnostic approaches.
Area of Science:
- Genetics
- Epigenetics
- Developmental Biology
Background:
- Intellectual disability (ID) etiology is often unclear despite advanced genetic testing.
- Imprinting disorders and epigenetic modifications are known causes of ID.
- DNA methylation changes are hypothesized to play a role in ID pathogenesis.
Purpose of the Study:
- To investigate DNA methylation patterns in individuals with intellectual disability.
- To identify potential links between DNA methylation alterations and intellectual disability.
- To explore the role of imprinting disorders in intellectual disability.
Main Methods:
- DNA methylation analysis using the HumanMethylation450 BeadChip on peripheral blood samples from 82 patients with ID and 19 controls.
- Validation of differentially methylated loci via bisulfite pyrosequencing.
- In-depth analysis of imprinted loci.
Main Results:
- No global DNA methylation signature distinguished ID patients from controls.
- Identified 157 regions with individual DNA methylation changes in at least one patient, correlating to 107 genes.
- Confirmed an undiagnosed Temple syndrome case and found DNA methylation changes in additional imprinted loci (PPIEL, IGF2R, MEG8, MCTS2/HM13) in multiple patients.
Conclusions:
- Imprinting disorders are likely underdiagnosed in ID populations.
- DNA methylation changes represent a potential avenue for identifying deregulated genes in intellectual disability.
- Epigenetic alterations, specifically DNA methylation, are implicated in the pathogenesis of intellectual disability.
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