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Current Alzheimer Research


ISSN (Print): 1567-2050
ISSN (Online): 1875-5828

Systematic Review Article

Depression in Dementia or Dementia in Depression? Systematic Review of Studies and Hypotheses

Author(s): Agnieszka Brzezińska, Julius Bourke, Rayito Rivera-Hernández, Magda Tsolaki, Joanna Woźniak and Jakub Kaźmierski*

Volume 17, Issue 1, 2020

Page: [16 - 28] Pages: 13

DOI: 10.2174/1567205017666200217104114

Price: $65


The majority of research works to date suggest that Major Depressive Disorder (MDD) is a risk factor for dementia and may predispose to cognitive decline in both early and late onset variants. The presence of depression may not, however, reflect the cause, rather, an effect: it may be a response to cognitive impairment or alters the threshold at which cognitive impairment might manifest or be detected. An alternative hypothesis is that depression may be part of a prodrome to Alzheimer’s Disease (AD), suggesting a neurobiological association rather than one of psychological response alone. Genetic polymorphisms may explain some of the variances in shared phenomenology between the diagnoses, the instance, when the conditions arise comorbidly, the order in which they are detected that may depend on individual cognitive and physical reserves, as well as the medical history and individual vulnerability. This hypothesis is biologically sound but has not been systematically investigated to date. The current review highlights how genetic variations are involved in the development of both AD and MDD, and the risk conferred by these variations on the expression of these two disorders comorbidly is an important consideration for future studies of pathoaetiological mechanisms and in the stratification of study samples for randomised controlled trials.

Keywords: Alzheimer's disease, depression, dementia, risk factor, comorbidity, common genes, antidepressants.

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