Association of Parkinson disease age of onset with DRD2, DRD3 and GRIN2B polymorphisms. (January 2016)

• Record Type: Journal Article
• Authors: Hassan, Anhar; Heckman, Michael G.; Ahlskog, J.E.; Wszolek, Zbigniew K.; Serie, Daniel J.; Uitti, Ryan J.; van Gerpen, Jay A.; Okun, Michael S.; Rayaprolu, Sruti; Ross, Owen A.
• Is Part Of: Parkinsonism & related disorders. Volume 22(2016)
• Page Start: 102
• Page End: 105
• Publication Date: 2016-01
• Subjects: Age -- Dopamine -- Genetics -- NMDA -- Parkinsonism -- Receptor; Parkinson's disease -- Periodicals; Movement disorders -- Periodicals; Movement Disorders -- Periodicals; Nerve Degeneration -- Periodicals; Nervous System Diseases -- Periodicals; Parkinson Disease -- Periodicals; Tremor -- Periodicals; Parkinson, Maladie de -- Périodiques; Parkinson's disease; 616.833
• DOI: 10.1016/j.parkreldis.2015.11.016
• Languages: English
• ISSNs: 1353-8020

Abstract

Abstract: Introduction: Dopamine and glutamate are crucial neurotransmitters in Parkinson disease (PD). While recent large meta-analyses reported that genetic variation of dopamine (DRD2, DRD3) and glutamine (NMDA, GRIN2B) neurotransmitter receptors was not associated with PD risk, they could conceivably influence PD phenotype. We studied the association of these receptor polymorphisms relating to PD age of onset. Methods: There were 664 PD patients and 718 controls, all Caucasian, with stored DNA at Mayo Clinic, Jacksonville, Florida. Genotyping was performed for DRD2 ( Taq 1A, rs1800497), DRD3 (rs6280), and NMDA ( GRIN2B, rs7301328 ) polymorphisms with ABI Taqman assays. Single nucleotide polymorphism associations with age of onset were evaluated using dominant, recessive, and additive genotypic models. Results: DRD3 variant carriers had an approximate 4.4-year decrease in mean age of onset when both copies of the minor allele were present ( P = 0.0034) and an approximate 1.5-year decrease in mean age at onset for every additional minor allele ( P = 0.023) (recessive and additive models, respectively). There was no association with age of onset for DRD2 or GRIN2B under any statistical model (all P ≥ 0.22). Conclusions: The DRD3 ( rs6280 ) polymorphism, but not DRD2 ( Taq1A ) or GRIN2B, influences younger PD age of onset in the US Caucasian population. Validation of these findings in larger studies with other ethnic groups is indicated. Highlights: DRD3(rs6280) is associated with 4.4 years earlier age-of-onset of PD in Caucasians. DRD2 and GRIN2B variants were not associated with PD age-of-onset. Validation is necessary in larger studies and different ethnic groups.