Analysis of the apolipoprotein E genotype in sibpairs with Parkinson's disease showed the E4 allele was over represented in those who shared the adjacent chromosome 19 markers. This suggests that apolipoprotein E4 is responsible for the linkage peak in this region and that it is a modest risk factor for Parkinson's disease.

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doi.org/10.1002/ajmg.b.30196, hdl.handle.net/1765/71307
American Journal of Medical Genetics. Part B: Neuropsychiatric Genetics
Department of Clinical Genetics

Martinez, M., Brice, A., Vaughan, J., Zimprich, A., Breteler, M., Meco, G., … Volpe, G. (2005). Apolipoprotein E4 is probably responsible for the chromosome 19 linkage peak for Parkinson's disease. American Journal of Medical Genetics. Part B: Neuropsychiatric Genetics, 136 B(1), 72–74. doi:10.1002/ajmg.b.30196