Related Experiment Videos
Ventricular noncompaction and distal chromosome 5q deletion
R M Pauli1, S Scheib-Wixted, L Cripe
1Department of Pediatrics, University of Wisconsin-Madison, Madison, Wisconsin 53705, USA. pauli@waisman.wisc.edu
American Journal of Medical Genetics
|July 9, 1999
Summary
A rare genetic deletion on chromosome 5q caused complex heart disease, including ventricular myocardial noncompaction, in a young girl. This deletion affected the cardiac specific homeobox gene (CSX), suggesting its haploinsufficiency may cause noncompaction.
Area of Science:
- Genetics
- Cardiology
- Developmental Biology
Background:
- Ventricular myocardial noncompaction is a rare congenital cardiomyopathy characterized by a two-layered myocardium.
- Genetic factors are implicated in the etiology of noncompaction, but specific causative genes remain largely unidentified.
Observation:
- A 7-year-old girl presented with a complex cardiac phenotype, including ventricular myocardial noncompaction.
- Genetic analysis revealed a distal 5q deletion, specifically del(5)(q35.1q35.3).
Findings:
- Fluorescent in situ hybridization (FISH) confirmed that the 5q deletion encompassed the locus for the cardiac specific homeobox gene (CSX).
- The identified deletion suggests haploinsufficiency of the CSX gene in this patient.
Implications:
- This case links a specific chromosomal deletion and CSX gene haploinsufficiency to ventricular myocardial noncompaction.
- CSX gene haploinsufficiency is proposed as a potential mechanism underlying some cases of congenital heart disease, specifically noncompaction.
- Further research into CSX function in cardiac development may elucidate novel therapeutic targets for congenital cardiomyopathies.