NEW YORK, Oct. 23 – DeCode Genetics has used data gleaned from its population genomics research of patients in Iceland with Parkinson’s disease to map the first gene linked to the main form of the disease, the company said on Tuesday.

The next step, the firm said, is to develop DNA-based diagnostics and drugs to treat the disorder.

The discovery also served to challenge the widely held notion that there is no identifiable genetic component that contributes to the development of the disease.

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