Genetic differences and longevity-related phenotypes influence lifespan and lifespan variation in a sex-specific manner in mice.
Level 5 - mechanism / opinion, no new human data
Animal research (secondary analysis of mouse datasets), Level 5 by CEBM
PubMed 33105070 · doi:10.1111/acel.13263
What was done
Researchers analyzed previously published datasets covering lifespan, age of puberty, and circulating IGF1 levels across 31 inbred mouse strains, Nrip1 knockout mouse colonies, and a B6.C3H-Igf1 congenic strain to evaluate sex differences in lifespan and lifespan variation.
What was found
The abstract reports no numerical values or statistics. Overall lifespan and lifespan variation did not differ significantly between sexes across all 31 inbred strains combined, though differences existed within and among individual strains. Lifespan variation in females and males correlated across strains. IGF1 levels correlated with lifespan variation and maximum lifespan in opposite directions between sexes: females with low IGF1 showed higher variation and extended maximum lifespan, while males showed the reverse. Wild-derived strains had higher lifespan variation (increased early deaths in both sexes, extended maximum lifespan in females) compared to domesticated strains. Sex differences in survival curves were negatively associated with the age of female puberty, which was accelerated in domesticated strains.
Why it matters
This work demonstrates that mammalian lifespan and longevity variation are shaped by sex-specific interactions with endocrine markers (IGF1) and developmental timing (puberty).
Limits
The study is restricted to mouse models and secondary dataset analysis. Total sample sizes, effect sizes, and p-values are not reported in the abstract. Results from inbred rodent strains may not translate directly to humans.
Cited by
- context Genetically engineering mice to go through puberty earlier causes them to die earlier.