Cookies on this website
We use cookies to ensure that we give you the best experience on our website. If you click 'Continue' we'll assume that you are happy to receive all cookies and you won't see this message again. Click 'Find out more' for information on how to change your cookie settings.
Skip to main content

To determine the association of parental family history with risk of dementia by age at onset and sex of affected parent in a population-based cohort.From 2000 to 2002, we assessed parental history of dementia in participants without dementia of the Rotterdam Study. We investigated associations of parental history with risk of dementia until 2015, adjusting for demographics, cardiovascular risk factors, and known genetic risk variants. Furthermore, we determined the association between parental history and markers of neurodegeneration and vascular disease on MRI.Of 2,087 participants (mean age 64 years, 55% female), 407 (19.6%) reported a history of dementia in either parent (mean age at diagnosis 79 years). During a mean follow-up of 12.2 years, 142 participants developed dementia. Parental history was associated with risk of dementia independently of known genetic risk factors (hazard ratio [HR] 1.67, 95% confidence interval [CI] 1.12-2.48), in particular when parents were diagnosed at younger age (<80 years: HR 2.58, 95% CI 1.61-4.15; ≥80 years: HR 1.01, 95% CI 0.58-1.77). Accordingly, age at diagnosis in probands was highly correlated with age at diagnosis in their parents <80 years (r = 0.57, p = 0.001) but not thereafter (r = 0.17, p = 0.55). Among 1,161 participants without dementia with brain MRI, parental history was related to lower cerebral perfusion and higher burden of white matter lesions and microbleeds. Dementia risk and MRI markers were similar for paternal and maternal history.Parental history of dementia increases risk of dementia, primarily when age at parental diagnosis is <80 years. Unexplained heredity may be attributed in part to cerebral hypoperfusion and small vessel disease. We found no evidence of preferential maternal compared to paternal transmission.

Original publication

DOI

10.1212/wnl.0000000000003871

Type

Journal article

Journal

Neurology

Publication Date

04/2017

Volume

88

Pages

1642 - 1649

Addresses

Departments of Epidemiology (F.J.W., S.J.v.d.L., C.M.v.D., A.H., M.K.I., M.W.V., M.A.I.), Neurology (F.J.W., P.J.K., M.K.I., M.A.I.), and Radiology and Nuclear Medicine (M.W.V., M.A.I.), Erasmus Medical Centre, Rotterdam, the Netherlands; and Department of Epidemiology (F.J.W., A.H.), Harvard T.H. Chan School of Public Health, Boston, MA.

Keywords

Brain, Humans, Dementia, Cardiovascular Diseases, Genetic Predisposition to Disease, Apolipoproteins E, Magnetic Resonance Imaging, Risk Factors, Cohort Studies, Follow-Up Studies, Parents, Age of Onset, F Factor, Aged, Middle Aged, Female, Male, Genotyping Techniques