Genetic trigger for heart ailment

(AFP) / 9 February 2013

A genetic variation doubles the risk of developing calcium deposits in the heart, a common condition that, in severe cases, can narrow or block the aorta, according to a study.

The genetic variation, found in seven per cent of the population, provides important clues about how to treat the disease, researchers said in the study published in the New England Journal of Medicine.

This is an important step forward in understanding the biology of the development of aortic stenosis, said senior author Wendy Post, from the Johns Hopkins University School of Medicine.

She added that the latest findings could lead to the development of targeted medications to slow the progression of the disease, which can cause chest pain and shortness of breath, and can in some cases require surgery.

The gene in question is involved in the production of a type of cholesterol particle called lipoprotein (a), which circulates in the blood.

Increased levels of lipoprotein (a) have been previously associated with aortic valve disease. However, prior studies could not differentiate whether it was simply a marker or a causal factor, said lead author Catherine Campbell, of Kaiser Permanente.

Our results provide the first evidence for a causal relationship, she added.

The researchers studied 2.5 million gene variants among more than 6,900 people of white European heritage, and they found that the particular variant was strongly associated with the aortic calcium deposits.

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Genetic trigger for heart ailment

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