Delayed paternal age of reproduction in humans is associated with longer telomeres across two generations of descendants.
Level 3 - non-randomized controlled study
Non-randomized observational longitudinal cohort study
PubMed 22689985 · doi:10.1073/pnas.1202092109
What was done
Using data and biological samples from a longitudinal cohort study in the Philippines, researchers analyzed the association between paternal age at birth and offspring telomere length (TL) (n = 2,023). They further tested for cumulative multigenerational effects by assessing the association between paternal grandfather age at father's birth and grandchild TL (n = 234), controlling for father's age at birth.
What was found
Paternal age at offspring birth was significantly associated with longer offspring TL (n = 2,023, P = 1.84 × 10⁻⁶). Grandchildren of older paternal grandfathers also had significantly longer telomeres (n = 234, P = 0.038), an effect that was independent of and additive to the father's age at birth. The estimated TL lengthening per year of delayed reproduction in fathers or grandfathers equaled the yearly TL shortening observed among middle-aged to elderly women in the cohort.
Why it matters
This study provides evidence that the paternal age-at-conception effect on offspring telomere length accumulates across multiple generations, suggesting a potential biological mechanism by which lineage reproductive timing could influence cellular senescence buffering.
Limits
The study is observational and cannot establish causal mechanisms. The multigenerational sub-analysis was limited in sample size (n = 234). Findings come from a single cohort in the Philippines, and direct health, disease, or longevity endpoints were not measured in the abstract.
Cited by
- supports Unlike other cell types, sperm telomeres lengthen as men age, and older fathers pass on longer telomeres to their offspring.