Clinical trial NCT00001225: Family Studies of Inherited Heart Disease
Official title: Family Studies of Hypertrophic Cardiomyopathy
Study type: OBSERVATIONAL
Overall status: COMPLETED
Conditions: Hypertrophic Cardiomyopathy
Keywords: DNA Polymorphisms
Echocardiography
Gene Mapping
Linkage Analysis
Hypertrophic Cardiomyopathy
Lead sponsor: National Institutes of Health Clinical Center (CC)
Sponsor class: NIH
First posted: 1999-11-04
Enrollment: 5880
Sex: ALL
Standard ages: CHILD
ADULT
OLDER_ADULT
Accepts healthy volunteers: yes

Brief summary: Hypertrophic cardiomyopathy (HCM) is a genetically inherited heart disease. It causes thickening of heart muscle, especially the chamber responsible for pumping blood out of the heart, the left ventricle. Hypertrophic cardiomyopathy (HCM) is the most important cause of sudden death in apparently healthy young people.

A genetic test called linkage analysis is used to locate genes causing inherited diseases like HCM. Linkage analysis requires large families to be evaluated clinically in order to identify the members with and without the disease.

In this study researchers will collect samples of DNA from family members of patients with HCM. The diagnosis of the disease will be made by history and physical examination, electrocardiogram (12 lead ECG), and ultrasound of the heart (2-D echocardiogram). The ability of the researchers to locate the gene responsible for the disease improves with increases in the size of the family and members evaluated.

In order to continue research on the genetic causes of heart disease, researchers intend on studying families with specific genetic mutations (beta-MHC) causing HCM. Researcher plan to also study families with HCM not linked to specific gene mutations (beta-MHC).

Detailed description: Hypertrophic cardiomyopathy (HCM) is the most important cause of sudden death in apparently healthy young individuals but its clinical manifestations are highly variable. Linkage analysis is used to localize a gene causing an inherited autosomal dominant disease, such as HCM. Linkage analysis requires that large families be evaluated clinically to determine the members with and without the disease. For this study, DNA needs to be extracted from blood samples of family members. The presence of the disease is determined by history and physical exam, 12 lead ECG and 2-D echocardiogram. The likelihood of localizing the gene increases with the size of the family and the number of members evaluated. The beta myosin heavy chain (beta-MHC) gene has been shown to be responsible for HCM in 10%-30% of affected kindreds. Other linage studies have shown that there are at least 3 other genes which cause HCM in other kindreds, but these genes are presently unknown. We have identified 13 unique mutations in the beta-MHC gene which cause the disease in 17 kindreds. This has allowed us to demonstrate skeletal muscle involvement, study the abnormal physiology which is a consequence of the mutations, make pre-symptomatic diagnosis, and redefine the natural history of the disease. In order to continue our clinical and laboratory studies of this disease over the next 3 years, it is our intention to identify 50 additional HCM kindreds, with approximately 50 members each, that have beta-MHC gene mutations. During this time, in order to map other HCM genes, we will also evaluate at least 6 families, of approximately 300 members each, in which the disease is not linked to the beta-MHC gene.

Eligibility criteria: INLUSION CRITERIA

Patients with a family history of hypertrophic cardiomyopathy are eligible.

Primary outcomes:
Secondary outcomes:
Other outcomes:
Locations:
city: Bethesda
country: United States
facility: National Heart, Lung and Blood Institute (NHLBI)
state: Maryland
Study officials:
References:
citation: Tanigawa G, Jarcho JA, Kass S, Solomon SD, Vosberg HP, Seidman JG, Seidman CE. A molecular basis for familial hypertrophic cardiomyopathy: an alpha/beta cardiac myosin heavy chain hybrid gene. Cell. 1990 Sep 7;62(5):991-8. doi: 10.1016/0092-8674(90)90273-h.
citation: Geisterfer-Lowrance AA, Kass S, Tanigawa G, Vosberg HP, McKenna W, Seidman CE, Seidman JG. A molecular basis for familial hypertrophic cardiomyopathy: a beta cardiac myosin heavy chain gene missense mutation. Cell. 1990 Sep 7;62(5):999-1006. doi: 10.1016/0092-8674(90)90274-i.
citation: Hejtmancik JF, Brink PA, Towbin J, Hill R, Brink L, Tapscott T, Trakhtenbroit A, Roberts R. Localization of gene for familial hypertrophic cardiomyopathy to chromosome 14q1 in a diverse US population. Circulation. 1991 May;83(5):1592-7. doi: 10.1161/01.cir.83.5.1592.