HST2 mediates SIR2-independent life-span extension by calorie restriction.
Level 5 - mechanism / opinion, no new human data
Laboratory mechanistic and genetic research in yeast (no human data).
PubMed 16051752 · doi:10.1126/science.1113611
What was done
Researchers investigated the mechanism of calorie restriction (CR)-mediated lifespan extension in budding yeast in the absence of Sir2, examining the role of its homolog Hst2 and ribosomal DNA stability.
What was found
The abstract reports no numerical data. It reports that Sir2-independent lifespan extension under calorie restriction is mediated by Hst2, which promotes the stability of repetitive ribosomal DNA.
Why it matters
This study reconciles conflicting findings in aging biology by showing that multiple sirtuin homologs can redundantly mediate dietary restriction longevity effects through rDNA maintenance in yeast.
Limits
The study is conducted entirely in yeast, so mechanistic findings regarding specific deacetylase homologs and rDNA stability cannot be directly extrapolated to human aging. The abstract provides no quantitative effect sizes or sample sizes.
Cited by
- contradicts Deleting the SIR2 gene blocks the lifespan-extending effects of calorie restriction in yeast.