40 years seems like a relatively short time for natural evolutionary processes to adapt a mammal to a highly radioactive environment. That’s like 10 to 20 generations of wolf and suddenly they are cancer resistant?

After all the needless loss of life surrounding the Chernobyl reactor explosion, finding viable cancer-resistant genetic mutations would be the ultimate silver lining.

[–] Endorkend@kbin.social 46 points 9 months ago* (last edited 9 months ago)

A mutation for having a higher radiation resistance or higher resistance to cancer is something that already happens in nature, but in most of the animal world those are relatively useless traits, normally cancer doesn't develop fast enough to stop procreation.

In Chernobyl, the highly elevated radiation would normally kill animals before they can even breed. The ones that don't have the resistance die before they get the chance, the ones that do have a higher resistance breed.

With humans in the modern age, a resistance to cancer or radiation trait never gets the chance to become a dominant evolutionary trait as most all people only develop the cancer later in life and the ones that do get cancer early more and more often can get treatment giving them a chance to procreate even when they got cancer young.

Outside Chernobyl, there is no evolutionary pressure for a trait like that to become dominant.

Living long enough to procreate is the primary drive in nature.

We generally don't see fast evolutionary changes in nature because nature doesn't change quickly often.

Leave it to us, humans, to create situations where the change is drastic and quick.

[–] Chainweasel@lemmy.world 14 points 9 months ago* (last edited 9 months ago) (1 children)

If you have an extremely high infant mortality rate, it won't take that long. If the radiation kills off a high enough percentage of individuals without cancer resistance it won't take long at all.
Theoretically you could do it in only 2-3 generations if you had environmental factors that could give 100% of individuals without resistance cancer.

[–] bluGill@kbin.social 1 points 9 months ago (2 children)

Only if you have some individuals with [cancer or whatever] resistance though.

[–] Endorkend@kbin.social 7 points 9 months ago* (last edited 9 months ago)

Everyone has "cancer or whatever" resistance. That's why DNA works, it has repair mechanisms.

Getting cancer is when that mechanism either fails or isn't good enough to repair the damage.

Abnormal radiation levels can cause an excess of damage or different type of damage than what your natural mechanism is capable of fixing.

We're constantly being radiated, we're constantly employing our resistances and defenses against radiation.

We float around on a rock in a sea of radiation and even we ourselves emit low levels of (mostly harmless) radiation.

[–] name_NULL111653@pawb.social 4 points 9 months ago

And that trait does exist in nature already, it's just rare and mostly useless until environmental pressures only allow those individuals to reproduce.

[–] Scubus@sh.itjust.works 7 points 9 months ago

High evolutionary pressure + large gene set = fairly rapid adaptation

[–] chaogomu@kbin.social 7 points 9 months ago

The thing is, the exclusion zone isn't uniformly radioactive. The hottest spots are not areas that wild life would normally spend a lot of time near.

Then there's the fact that the way we're all taught about radiation and cancer is just flat out wrong. The Linear No Threshold model that most people know was actually created by the Rockefeller Foundation in an attempt to slow the adoption of nuclear power.

Combine those two factors, and you get stories like this, where researchers are shocked that higher than average radiation exposure doesn't equate to a simple linear increase in cancer rate.

Not that these wolves haven't developed an increased resistance to radiation. But it's not a new thing. Every living creature on this planet has mechanisms to repair DNA from radiation exposure. These wolves are simply better at it now than generations past.

[–] bort@feddit.de 6 points 9 months ago

evolution could happen in jumps. How often that happens is debatable.

https://en.wikipedia.org/wiki/Punctuated_equilibrium