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Human aging is characterized by focused changes in gene expression and deregulation of alternative splicing
Abstract
Summary: Aging is a major risk factor for chronic disease in the human population, but there are little human data on gene expression alterations that accompany the process. We examined human peripheral blood leukocyte in‐vivo RNA in a large‐scale transcriptomic microarray study (subjects aged 30–104 years). We tested associations between probe expression intensity and advancing age (adjusting for confounding factors), initially in a discovery set (n = 458), following‐up findings in a replication set (n = 240). We confirmed expression of key results by real‐time PCR. Of 16 571 expressed probes, only 295 (2%) were robustly associated with age. Just six probes were required for a highly efficient model for distinguishing between young and old (area under the curve in replication set; 95%). The focused nature of age‐related gene expression may therefore provide potential biomarkers of aging. Similarly, only 7 of 1065 biological or metabolic pathways were age‐associated, in gene set enrichment analysis, notably including the processing of messenger RNAs (mRNAs); [P < 0.002, false discovery rate (FDR) q < 0.05]. This is supported by our observation of age‐associated disruption to the balance of alternatively expressed isoforms for selected genes, suggesting that modification of mRNA processing may be a feature of human aging.
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Aging is associated with an aberrant production and maturation of many mRNAs.
“Aging is associated with an increase in transcriptional noise (Bahar et al., 2006), and an aberrant production and maturation of many mRNAs (Harries et al., 2011; Nicholas et al., 2010).”
From The Hallmarks of Aging (2013) · cites this paper as Harries et al., 2011
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“In some reports, the majority of changes appeared to be in genes with little tissue-specific regulation, suggesting that most of the transcriptomic alterations with age might be generalized (Rodwell et al., 2004; de Magalhaes et al., 2009).”
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Metadata
- Authors
- Harries, L. W., Hernandez, D., Henley, W., Wood, A. R., Holly, A. C., Bradley‐Smith, R. M., Yaghootkar, H., Dutta, A., Murray, A., Frayling, T. M., Guralnik, J. M., Bandinelli, S., Singleton, A., Ferrucci, L., & Melzer, D.
- Venue
- Aging Cell
- Publisher
- Wiley
- Published
- 2011-07-19
- Volume
- 10
- Issue
- 5
- Pages
- 868-878
- ISSN
- 1474-9718
- 1474-9726
- PMC
- PMC3173580
- Cited by
- 256
- References
- 7
- Language
- en
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