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A Suppressor Screen for the Characterization of Genetic Links Regulating Chronological Lifespan in Saccharomyces cerevisiae

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SIR2: a potential target for calorie restriction mimetics.

Danica Chen¹, Leonard Guarente

¹Department of Biology, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA.

Trends in Molecular Medicine

|January 9, 2007

Summary

Calorie restriction (CR) extends lifespan and mitigates aging diseases. The silent information regulator 2 (SIR2) gene, a NAD-dependent deacetylase, regulates lifespan and mediates CR, offering potential therapeutic targets for aging.

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Area of Science:

Genetics and Molecular Biology
Aging Research
Biochemistry

Background:

Calorie restriction (CR) is known to extend lifespan and reduce age-related diseases in various species.
The silent information regulator 2 (SIR2) gene, encoding a NAD-dependent deacetylase, has emerged as a key regulator in lifespan extension.
Understanding SIR2's role is crucial for developing interventions against aging-related conditions.

Purpose of the Study:

To review the evidence linking SIR2 to lifespan regulation and CR mediation in different organisms.
To explore the function of mammalian SIR2 homologs in CR-induced physiological changes and aging diseases.
To discuss novel small molecules that activate SIR2 as potential CR mimetics.

Main Methods:

Literature review and synthesis of existing research on SIR2 and calorie restriction.
Analysis of data from model organisms (Saccharomyces cerevisiae, Caenorhabditis elegans) and mammalian studies.
Examination of recent advancements in developing SIR2-activating small molecules.

Main Results:

SIR2 family genes are evolutionarily conserved regulators of lifespan.
SIR2 mediates CR effects on lifespan in lower species.
Mammalian SIR2 homologs play roles in CR responses and aging pathology.

Conclusions:

The SIR2 gene family is a critical, conserved regulator of lifespan.
Modulating SIR2 activity presents a promising strategy for developing CR mimetics.
Targeting SIR2 may offer new therapeutic avenues for combating diseases of aging.