Abstract:
:Mechanisms determining characteristic age-of-onset for neurological diseases are largely unknown. Normal brain aging associates with robust and progressive transcriptome changes ("molecular aging"), but the intersection with disease pathways is mostly uncharacterized. Here, using cross-cohort microarray analysis of four human brain areas, we show that neurological disease pathways largely overlap with molecular aging and that subjects carrying a newly-characterized low-expressing polymorphism in a putative longevity gene (Sirtuin5; SIRT5(prom2)) have older brain molecular ages. Specifically, molecular aging was remarkably conserved across cohorts and brain areas, and included numerous developmental and transcription-regulator genes. Neurological disease-associated genes were highly overrepresented within age-related genes and changed almost unanimously in pro-disease directions, together suggesting an underlying genetic "program" of aging that progressively promotes disease. To begin testing this putative pathway, we developed and used an age-biosignature to assess five candidate longevity gene polymorphisms' association with molecular aging rates. Most robustly, aging was accelerated in cingulate, but not amygdala, of subjects carrying a SIRT5 promoter polymorphism (+9 years, p=0.004), in concordance with cingulate-specific decreased SIRT5 expression. This effect was driven by a set of core transcripts (+24 years, p=0.0004), many of which were mitochondrial, including Parkinson's disease genes, PINK-1 and DJ-1/PARK7, hence suggesting that SIRT5(prom2) may represent a risk factor for mitochondrial dysfunction-related diseases, including Parkinson's, through accelerated molecular aging of disease-related genes. Based on these results we speculate that a "common mechanism" may underlie age-of-onset across several neurological diseases. Confirming this pathway and its regulation by common genetic variants would provide new strategies for predicting, delaying, and treating neurological diseases.
journal_name
Neurobiol Disjournal_title
Neurobiology of diseaseauthors
Glorioso C,Oh S,Douillard GG,Sibille Edoi
10.1016/j.nbd.2010.09.016subject
Has Abstractpub_date
2011-02-01 00:00:00pages
279-90issue
2eissn
0969-9961issn
1095-953Xpii
S0969-9961(10)00317-7journal_volume
41pub_type
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