Evidence for improved DNA repair in the long-lived bowhead whale.
Level 5 - mechanism / opinion, no new human data
Bench and animal model mechanistic study without clinical human data
PubMed 41162698 · doi:10.1038/s41586-025-09694-5
What was done
The authors investigated cancer resistance mechanisms in the long-lived bowhead whale (*Balaena mysticetus*). They tested the number of oncogenic hits required to transform primary bowhead whale fibroblasts compared to human fibroblasts. They assessed DNA double-strand break repair efficiency, repair fidelity, and mutation rates across bowhead whale cells and other mammalian cells. They measured expression of cold-inducible RNA-binding protein (CIRBP) in whale tissues and fibroblasts, evaluated bowhead CIRBP effects on non-homologous end joining, homologous recombination, micronuclei formation, and end joining in human cells and in vitro, and overexpressed CIRBP in *Drosophila* to measure effects on lifespan and radiation resistance.
What was found
The abstract reports no numerical values. Bowhead whale fibroblasts unexpectedly required fewer oncogenic hits for malignant transformation than human fibroblasts. Bowhead cells exhibited enhanced DNA double-strand break repair capacity and fidelity, along with lower mutation rates compared to other mammalian cells. CIRBP was highly expressed in bowhead fibroblasts and tissues. Bowhead CIRBP enhanced non-homologous end joining and homologous recombination in human cells, reduced micronuclei formation, promoted DNA end protection, and stimulated end joining in vitro. CIRBP overexpression extended lifespan and improved radiation resistance in *Drosophila*.
Why it matters
This study provides evidence that bowhead whales achieve longevity and cancer resistance through enhanced, high-fidelity DNA repair mediated by factors like CIRBP rather than by accumulating extra tumor suppressor genes.
Limits
The abstract reports no numerical data, effect sizes, or sample sizes (number of whale specimens, cell lines, or flies tested). The findings rely on in vitro cell culture systems and an invertebrate model (*Drosophila*), which may not capture full in vivo vertebrate physiology or organism-level cancer dynamics.
Cited by
- supports Cultured whale cells do not lose their cellular identity rapidly even after sustaining DNA breaks.