4 ms·
Why don't these fish die of cancer and old age sooner?
by josh-wrale 19d ago
Why don't these fish die of cancer and old age sooner?
- jkahrs595 19d agoBecause they don’t have vape pens and processed foods
- functionmouse 19d agoseems reductive
- PowerElectronix 19d agoIt's usually becaise they have lower metabolism so their cells don't suffer as much damage as ours, and they probably have a lot of copies of genes that prevent cancer.
- ComputerGuru 19d agoMaybe. But whales don’t get cancer either, and whale metabolism is… impressive (well their resting heart rate is lower than ours but they grow orders of magnitude faster, to a point, and sustain themselves gorging on literal tons of food).
- maxerickson 19d agoHumans have pretty low selective pressure for cancer resistant genes (a tiny fraction of people get cancer before or during their reproductive years). I wonder if whales survive to an equivalent of human old age (where we can be pretty fragile and still survive for decades).
- ComputerGuru 19d ago> I wonder if whales survive to an equivalent of human old age (where we can be pretty fragile and still survive for decades). They do and this is well-documented. They're one of the few (only?) other species where we can directly see the role matriarchs (grandmothers, either past their reproductive ages or even undergoing menopause) have on the development of the youth, and it's been used to explore the role of living post-reproductive ancestors might have on natural selection (which was previously not thought to be affected by it). Maternal grandmothers have even been found to ~spontaneously regain their milk to help nurse infant whales, iirc.
- maxerickson 19d agoHumans commonly have grandchildren in their 40s (less so recently of course). We get fragile in our 70s. I'm wondering about living decades in that fragile state, where cancer happens to be a lot more common.
- ComputerGuru 19d agoThat mostly doesn’t count, since humans still regularly have kids of their own in their forties (so the direct link to natural selection would overshadow any lower-pressure grandmotherly effects), so you’d have to push the window out to the post-menopausal period, which coincides with the period in which various cancers begin to be an issue.
- UltraSane 19d agoI like the theory that whales are so big that their tumors get killed by tumors before they can spread.