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The motor phenotype of Parkinson's disease in relation to age at onset

Wickremaratchi, Mirdhu M., Knipe, Megan Duleeka W., Sastry, B. S. Dwarakanath, Morgan, Elizabeth, Jones, Anne Maria, Salmon, Rachel, Weiser, Richard, Moran, Maralyn, Davies, Debbie, Ebenezer, Louise, Raha, Sandip, Robertson, Neil ORCID:, Butler, Christopher Collett ORCID:, Ben-Shlomo, Yoav and Morris, Huw Rees 2011. The motor phenotype of Parkinson's disease in relation to age at onset. Movement Disorders 26 (3) , pp. 457-463. 10.1002/mds.23469

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Background: Parkinson's disease (PD) is heterogeneous and age at onset may define variation in clinical phenotype. Most previous studies have used various age cut-offs and have been based on clinical case series. Methods: We have studied the association between clinical features and age of onset in 358 community-based and regional patients with PD. Results: Tremor at presentation is twice as common in those with onset over 64 years as compared to those with onset under 45 (early onset PD - EOPD) and becomes more common with increasing age at onset (p values for trend ≤ 0.004). Dystonia affects 60% of those with EOPD, shows a curvilinear relationship with age at onset (cubic versus linear p=0.01) with highest risk in patients whose disease began before 48 years. In this study age at onset was a strong predictor of the development of dyskinesias, with younger age associated with a higher risk of dyskinesias. Following multivariable analysis, allowing for possibly confounding factors (disease duration, L-DOPA dosage, L-DOPA treatment duration) younger age at onset, (less than 55 years) predicted the development of L-DOPA induced dyskinesia (odds ratio <45 years 2.1, 95% CI 1.0, 4.8; odds ratio < 55 years 3.8, 95% CI 1.8, 8.0). Only 2/70 (2.9%) EOPD patients carried pathogenic parkin or PINK1 mutations and the clinical differences between early and late onset disease were not explained by the presence of mutations in these genes. Discussion: This study highlights the clinical differences between early and late onset PD, which have important implications for diagnosis and management.

Item Type: Article
Date Type: Publication
Status: Published
Schools: MRC Centre for Neuropsychiatric Genetics and Genomics (CNGG)
Systems Immunity Research Institute (SIURI)
Subjects: R Medicine > RB Pathology
Uncontrolled Keywords: motor symptoms; age at onset; young onset; early onset; Parkinson's disease
Publisher: John Wiley & Sons
ISSN: 0885-3185
Last Modified: 06 Jan 2023 02:51

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