Evidence for the role of FMR1 gray zone alleles as a risk factor for parkinsonism in females

Abstract

Background and Objective There is convincing evidence that small CGG expansion (41-54 repeats): FMR1 “gray zone” alleles (GZ) contribute to the risk of parkinsonism in males, but there is insufficient corresponding data in females. This study intends to fill this gap. Methods We screened whole-blood–derived DNA from a cohort of 601 females diagnosed with idiopathic PD, and from dry Guthrie blood spots from a local sample of 1,005 female newborns (population controls), for the size of the FMR1 CGG repeat using a PCR technique. Results We found a significant excess (8.2%) of GZ carriers compared with 5.2% in the control sample, with a P value of 0.009 for the difference in proportions. Conclus..