- LRRK2 G2019S in Families with Parkinson Disease Who Originated from Europe and the Middle East: Evidence of Two Distinct Founding Events Beginning Two Millennia Ago. Zabetian, C.P., Hutter, C.M., Yearout, D., Lopez, A.N., Factor, S.A., Griffith, A., Leis, B.C., Bird, T.D., Nutt, J.G., Higgins, D.S., Roberts, J.W., Kay, D.M., Edwards, K.L., Samii, A., Payami, H. Am. J. Hum. Genet. (2006)