Related Experiment Videos
[Genetics of dilated cardiomyopathy]
1Max-Delbrück-Centrum für Molekulare Medizin, Humboldt-Universität zu Berlin. lthier@mdc-berlin.de
Insights
Dilated cardiomyopathy (DCM) is a heart muscle disorder with varied causes, including genetic factors. About 20-35% of DCM cases result from inherited gene defects, often autosomal dominant.
Area of Science:
- Cardiology
- Genetics
- Molecular Biology
Context:
- Dilated cardiomyopathy (DCM) presents with cardiac dilatation and impaired systolic function.
- Etiologies for DCM are diverse, including viral, immunological, toxic, and genetic factors.
- Genetic forms account for 20-35% of DCM cases, predominantly autosomal dominant.
Purpose:
- To review the clinical presentation and genetic basis of dilated cardiomyopathy.
- To highlight the known genetic loci and the ongoing search for causative genes.
- To discuss the rare X-linked form of DCM linked to dystrophin gene mutations.
Summary:
- DCM is characterized by enlarged ventricles and reduced pumping function, with varied clinical manifestations.
- While many DCM cases have identifiable causes, a significant portion is inherited.
- Six dominant DCM loci are known, but specific genes remain elusive; X-linked DCM involves dystrophin mutations.
Impact:
- Understanding the genetic underpinnings of DCM is crucial for diagnosis and potential therapeutic strategies.
- Identification of causative genes will improve genetic counseling and risk assessment for affected families.
- Further research into DCM genetics may reveal novel pathways for heart muscle disease treatment.
Abstract:
Dilated cardiomyopathy (DCM) is a heart muscle disorder characterized by cardiac dilatation and impaired systolic function. In an increasing number of all DCM cases a specific etiology can be identified and in the remaining patients DCM is termed idiopathic. There is a wide variation of the clinical presentation in DCM. The majority of patients manifests classical disease, i.e. heart failure due to left (and right) ventricular systolic dysfunction. However, some cases may come to clinical attention because of supraventricular arrhythmias such as sinus node dysfunction, AV-block or atrial fibrillation. Although a multitude of etiologies may be responsible for DCM (e.g. viral, immunological, toxic), the disease is inherited as a single gene disorder in at least 20 to 35% of cases. Most genetic forms of DCM are caused by autosomal dominant gene defects. Six dominant disease loci on chromosomes 1p1-q1, 1q32, 3p22-p25, 6q23, 9q13 und 10q21-q23 have been identified but the corresponding disease genes are not yet known. X-linked DCM without skeletal muscle disease is a rare variety of adult DCM which can be caused by specific mutations in the dystrophin gene on chromosome Xp21.