Influence of heterozygosity for Parkin mutation on onset age in familial parkinson disease: The genePD study

Mei Sun, Jeanne C. Latourelle, G. Frederick Wooten, Mark F. Lew, Christine Klein, Holly A. Shill, Lawrence I. Golbe, Margery H. Mark, Brad A. Racette, Joel S. Perlmutter, Abbas Parsian, Mark Guttman, Garth Nicholson, Gang Xu, Jemma B. Wilk, Marie H. Saint-Hilaire, Anita L. DeStefano, Ranjana Prakash, Sally Williamson, Oksana SuchowerskyNancy Labelle, John H. Growdon, Carlos Singer, Ray L. Watts, Stefano Goldwurm, Gianni Pezzoli, Kenneth B. Baker, Peter P. Pramstaller, David J. Burn, Patrick F. Chinnery, Scott Sherman, Peter Vieregge, Irene Litvan, Tammy Gillis, Marcy E. MacDonald, Richard H. Myers, James F. Gusella

Research output: Contribution to journalArticlepeer-review

122 Scopus citations


Background: The PARK2 gene at 6q26 encodes parkin, whose inactivation is implicated in an early-onset autosomal recessive form of Parkinson disease (PD). Objective: To evaluate the influence of heterozygosity for parkin mutation on onset age in a sample of families with at least 2 PD-affected members. Design: Clinical and genetic study. Setting: Twenty collaborative clinical sites. Patients: Patients with familial PD collected in the GenePD study. Studied families were selected for (1) affected sibling pairs sharing 2 alleles identical by state at PARK2 (D6S305) or (2) 1 or more family members with onset age younger than 54 years, regardless of D6S305 status. At least 1 member from each of 183 families underwent comprehensive screening for deletion/insertion variants and point mutations in PARK2. Main Outcome Measures: Mutations in the parkin gene were screened by means of single-stranded conformation polymorphism and sequencing in all 12 coding exons and flanking intronic sequences for point mutations and duplex quantitative polymerase chain reaction in all exons for rearrangement, duplication, and deletion. Results: Mutations were found in 23 families (12.6% of those screened). Among the mutation-positive families, 10 (43%) contained compound heterozygotes; 3 (13%), homozygotes; and 10 (43%), heterozygotes. The onset age in patients with parkin gene mutations ranged from 20 to 76 years. Patients with 1 parkin mutation had an 11.7-year age at onset than did patients with none (P=.04), and patients with 2 or more parkin mutations had a 13.2-year decrease in age at onset compared with patients with 1 mutation (P=.04). Conclusions: These data indicate that parkin mutations are not rare in multiply affected sibships, and that heterozygous mutation carrier status in PARK2 significantly influences age at onset of PD.

Original languageEnglish (US)
Pages (from-to)826-832
Number of pages7
JournalArchives of Neurology
Issue number6
StatePublished - 2006

ASJC Scopus subject areas

  • Arts and Humanities (miscellaneous)
  • Clinical Neurology


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