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Genetic evidence supporting a causal role of depression on Alzheimer’s disease
Published:December 16, 2021DOI:https://doi.org/10.1016/j.biopsych.2021.11.025
Abstract
Background
Depression is associated with higher risk for Alzheimer’s disease (AD) in several
prospective studies; however, mechanisms underlying this association remain unclear.
Methods
We examined genetic correlation between depression and AD using LDSC regression. We
then tested for evidence of causality between depression and AD using Mendelian randomization
and genome-wide association study (GWAS) results. Subsequently, cis and trans quantitative trait locus (QTL) analyses for the depression-GWAS signals were performed
to resolve the genetic signals to specific DNA-methylation sites, brain transcripts,
and proteins. These transcripts and proteins were then examined for associations with
AD and its endophenotypes. Lastly, associations between depression polygenic risk
score (PRS) and AD endophenotypes were examined.
Results
We detected a significant genetic correlation between depression and AD suggesting
that they have a shared genetic basis. Furthermore, we found that depression has a
causal role in AD through Mendelian randomization but did not find evidence for a
causal role of AD on depression. Moreover, we identified 75 brain transcripts and
28 brain proteins regulated by the depression GWAS signals through QTL analyses. Among
these, 46 transcripts and 7 proteins were associated with rates of cognitive decline
over time, AD pathologies, and AD diagnosis in two separate cohorts, implicating them
in AD. Additionally, we found that higher depression PRS was associated with faster
decline of episodic memory over time.
Conclusions
Depression appears to have a causal role in AD, and this causal relationship is likely
driven, in part, by the 53 brain transcripts and proteins identified in this study.
Keywords
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