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Curr Alzheimer Res ; 17(1): 16-28, 2020.
Article in English | MEDLINE | ID: mdl-32065103

ABSTRACT

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.


Subject(s)
Cognitive Dysfunction/complications , Dementia/complications , Depressive Disorder, Major/complications , Cognitive Dysfunction/psychology , Dementia/psychology , Depressive Disorder, Major/psychology , Humans , Risk Factors
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