Five new Parkinson's genes that could provide future targets for treatments have been identified by researchers.
The study, to be published in The Lancet, is said to be the most wide ranging genetic analysis of Parkinson's disease ever conducted.
It was found that 20 per cent of patients who had the highest number of risk variants were 2.5 times likely to develop the condition than those with the least genetic predisposition.
Researchers said: "We have confirmed a strong genetic component to Parkinson's disease which, until recently, was thought to be completely caused by environmental factors."
In other Parkinson's news, it has been found that people with lighter coloured hair are more likely to develop the condition as they get older.
Researchers from Harvard University split hair colour into black, brown, blonde and red, with black the darkest and red the lightest.
They found that those with black hair were the least likely to develop Parkinson's and those with red hair were at the most risk.
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