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Germline mosaicism in Coffin-Lowry syndrome
S Jacquot1, K Merienne, S Pannetier
1Institut de Génétique et de Biologie Moléculaire et Cellulaire, CNRS/INSERM/ULP, Illkirch, France.
European Journal of Human Genetics : EJHG
|January 15, 1999
Summary
A novel splice site mutation in the RSK2 gene causes Coffin-Lowry syndrome due to an unstable, internally deleted protein. This mutation arose from maternal germline mosaicism, impacting genetic counseling.
Area of Science:
- Genetics
- Molecular Biology
Background:
- Coffin-Lowry syndrome is a rare genetic disorder.
- Mutations in the RSK2 gene are a known cause of Coffin-Lowry syndrome.
Observation:
- A novel splice site mutation in the RSK2 gene was identified in a Coffin-Lowry syndrome family.
- This mutation resulted in exon 5 skipping and an unstable, internally deleted RSK2 protein.
- The mutation was present in affected offspring but not in unaffected siblings or the mother's lymphocytes.
Findings:
- The mutation likely occurred as a postzygotic event in the mother, indicating germline mosaicism.
- Standard genetic markers could have provided misleading information for genetic counseling in this family.
Implications:
- Precise identification of disease-causing mutations is crucial for accurate genetic diagnosis and counseling.
- Germline mosaicism presents unique challenges in genetic inheritance and risk assessment.