Increased dosage of a sir-2 gene extends lifespan in Caenorhabditis elegans.
Level 5 - mechanism / opinion, no new human data
Preclinical bench/animal research (Caenorhabditis elegans model).
PubMed 11242085 · doi:10.1038/35065638
What was done
Lifespan was evaluated in Caenorhabditis elegans strains containing duplications of chromosomal regions, specifically assessing strains with extra copies of sir-2.1 (homologous to yeast SIR2). Genetic analysis was performed to determine the interaction between the sir-2.1 transgene and the daf-16 transcription factor in the insulin-like signaling pathway.
What was found
Duplication of the region containing sir-2.1 extended adult lifespan by up to 50%. Genetic analysis placed sir-2.1 upstream of daf-16. Specific sample sizes, control survival values, and variance metrics were not reported in the abstract.
Why it matters
This study linked Sir2 proteins to lifespan extension in a multicellular organism, demonstrating an interaction with conserved insulin-like signaling.
Limits
This is non-human animal research with unverified direct applicability to human aging. The abstract omits sample sizes (number of worms or replicates), baseline survival numbers, effect variance, and statistical significance values.
Cited by
- supports Longevity genes were first discovered in model organisms such as nematode worms and yeast.