Familial Atrial Fibrillation - Cause

Cause

It is associated with multiple genes:

Type OMIM Gene Locus
ATFB1 608583 ? 10q22-q24
ATFB2 608988 ? 6q
ATFB3 607554 KCNQ1 11
ATFB4 611493 KCNE2 21
ATFB5 611494 ? 4q25
ATFB6 612201 NPPA 1p36-p35
ATFB7 612240 KCNA5 12p13
ATFB8 613055 ? 16q22

Mutations in the KCNQ1 gene cause familial atrial fibrillation. The KCNE2 and KCNJ2 genes are associated with familial atrial fibrillation. A small percentage of all cases of familial atrial fibrillation are associated with changes in the KCNE2, KCNJ2, and KCNQ1 genes. These genes provide instructions for making proteins that act as channels across the cell membrane. These channels transport positively charged potassium ions into and out of cells. In heart muscle, the ion channels produced from the KCNE2, KCNJ2, and KCNQ1 genes play critical roles in maintaining the heart's normal rhythm. Mutations in these genes have been identified in only a few families worldwide. These mutations increase the activity of the channels, which changes the flow of potassium ions between cells. This disruption in ion transport alters the way the heart beats, increasing the risk of syncope, stroke, and sudden death.

Most cases of atrial fibrillation are not caused by mutations in a single gene. This condition is often related to structural abnormalities of the heart or underlying heart disease. Additional risk factors for atrial fibrillation include high blood pressure (hypertension), diabetes mellitus, a previous stroke, or an accumulation of fatty deposits and scar-like tissue in the lining of the arteries (atherosclerosis). Although most cases of atrial fibrillation are not known to run in families, studies suggest that they may arise partly from genetic risk factors. Researchers are working to determine which genetic changes may influence the risk of atrial fibrillation.

Familial atrial fibrillation appears to be inherited in an autosomal dominant pattern, which means the defective gene is located on an autosome, and only one copy of the defective gene - inherited from one parent - is sufficient to cause the disorder.

Read more about this topic:  Familial Atrial Fibrillation

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