"Unfortunately, the reality of these studies has been very disappointing, and our discovery certainly could explain at least one of the reasons why."

AAA is a localized widening and weakening of the abdominal aorta, and primarily affects elderly Caucasian men who smoke, have high blood pressure and high cholesterol levels. It often has no symptoms, but can lead to aortic ruptures which are fatal in 90 per cent of cases.

If the mutations discovered in the tissue cells actually predispose for AAA, they present an ideal target for new therapies, and may have even wider therapeutic implications.

"This will probably have repercussions for vascular disease in general," said Schweitzer, of McGill's Department of Medicine. "We have not yet looked at coronary or cerebral arteries, but I would suspect that this mutation may be present across the board."

Schweitzer is optimistic that this discovery may lead to new treatments for vascular disease in the near to medium term.

"The timeline might be five to 10 years," he said. "We have to do in-vitro cell culture experiments first, prove it in an animal model, and then develop a molecule or protein which will affect the mutated gene product. This is the first step, but it's an important step."

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