Biallelic RFC1 Expansions Are a Rare Cause of Early-Onset and Familial Parkinson's Disease

Biallelic pathogenic expansions in RFC1 contribute to the genetic etiology of PD, with a frequency similar to that of other known autosomal recessive PD genes. RFC1-positive PD is currently not clinically distinguishable from RFC1-negative PD, but genetic background may play a role in future therapies or other interventions.