Background The role of genetics in early-onset Parkinson's diseasehas been established, but whether there is a genetic contributionto the more common, late-onset form remains uncertain.
Methods We reviewed the medical records and confirmed the diagnosisof Parkinson's disease in 772 living and deceased patients inwhom the disease had been diagnosed during the previous 50 yearsin Iceland. With the use of an extensive computerized data basecontaining genealogic information on 610,920 people in Icelandduring the past 11 centuries, several analyses were conductedto determine whether the patients were more related to eachother than random members of the population (control subjects).
Results Patients with Parkinson's disease, including a subgroupof 560 patients with late-onset disease (onset at >50 yearsof age), were significantly more related to each other thanwere subjects in matched groups of controls, and this relatednessextended beyond the nuclear family. The risk ratio for Parkinson'sdisease was 6.7 (95 percent confidence interval, 4.3 to 9.6)for siblings, 3.2 (95 percent confidence interval, 1.2 to 7.8)for offspring, and 2.7 (95 percent confidence interval, 1.6to 3.9) for nephews and nieces of patients with late-onset Parkinson'sdisease.
Conclusions Late-onset Parkinson's disease has a genetic componentas well as an environmental component.
Source Information
From the National University Hospital (S.S., G.G.) and deCODE genetics (A.A.H., T.J., H.P., M.L.F., A.K., J.R.G., K.S.), Reykjavik, Iceland; and the Department of Human Genetics, University of Chicago, Chicago (A.K.).
Address reprint requests to Dr. Stefánsson at deCODE genetics, Lynghals 1, Reykjavik 110, Iceland, or at kstefans{at}decode.is, or to Dr. Sveinbjörnsdóttir at the National University Hospital, Reykjavik, Iceland, or at sigurl{at}rsp.is.
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