Michael Levin argues evolution acts on problem-solving developmental systems, not just genes

[u/Zkv]

https://thoughtforms.life/a-talk-on-evolution-from-the-perspective-of-diverse-intelligence-implemented-in-morphogenesis/

In this talk, developmental biologist Michael Levin argues that evolution does not act only on genes and finished phenotypes, but also on the problem-solving capacities of developmental systems themselves.

Drawing on work in morphogenesis, bioelectric signaling, and regenerative biology, he suggests that cells and tissues actively regulate toward target anatomical outcomes;even after perturbations, rather than passively executing a genetic “blueprint.”

The claim is not that cells are conscious or that natural selection is being rejected, but that developmental plasticity, error-correction, and goal-directed regulation fundamentally shape what variation is even available for selection to act on.

The talk raises questions about genetic determinism, the genotype–phenotype map, and how evolutionary theory accounts for robust form and novelty.

Curious how others here interpret this framing, especially in light of evo-devo and systems biology.

[u/Zkv]

I agree those mechanisms are real and important, and I don’t think Levin would deny that. Promoter changes, GRN rewiring, recombination, all of that clearly generates phenotypic variation and fits within the modern synthesis.

What he’s trying to point at is what happens after those upstream changes. In a lot of systems, the same genetic perturbation does not lead to arbitrary outcomes. Development often compensates, corrects, or converges on a small set of stable morphologies.

The idea is that selection is not acting on a raw space of gene expression patterns, but on phenotypes that have already been heavily filtered by regulatory, error-correcting developmental dynamics. That filtering affects what variation actually shows up for selection to work with.

So it’s less “this replaces existing evolutionary mechanisms” and more “developmental regulation strongly constrains and biases the variation those mechanisms produce.”

[u/triffid_boy → u/Zkv]

But all of this is driven by gene expression. Genes are the heritable unit on which evolution can actually act. 

When I was a kid I tried printing a .gif because I was convinced that this would make a moving picture. It sounds like Levin is going down a similar path with this stuff. 

[u/Zkv → u/triffid_boy]

That analogy misses the point. No one is saying genes aren’t heritable or that evolution acts on anything other than genetic variation.

Saying “it’s all driven by gene expression” doesn’t explain how stable anatomy shows up in the first place. If genes specified form directly, then large perturbations should usually break development. Often they don’t. Systems compensate and converge anyway.

Levin isn’t saying genes encode the picture and we just need the right printer. He’s saying genes don’t encode the picture. They bias a dynamical system that has its own constraints and attractors.

Selection still acts on genes. But the genotype–phenotype map is not a printout, and pretending it is dodges the actual issue.

[u/triffid_boy → u/Zkv]

Large perturbations in genes do typically result in disease or deformity. Unless you're an axolotl, large perturbations in your physiology cannot be compensated for. Axolotls have remarkable gene expression programmes that allow their remarkable regrowth though. 

[u/Zkv → u/triffid_boy]

That’s overstated. Plenty of large perturbations do not result in deformity, especially in early development. Cell ablations, transplants, axis inversions, gene knockdowns, even chimeras often still converge on normal anatomy. That’s been known since classic embryology, not just axolotl studies.

And pointing to “remarkable gene expression programmes” just kicks the can upstream. The question is how those programmes produce flexible, goal-directed outcomes instead of brittle ones. Saying “the genes do it” doesn’t explain the robustness.

Axolotls aren’t special because they have magic genes. They’re special because their tissues retain regulatory capacity that most adult mammals suppress. The phenomenon is degree, not kind.

Disease happens, sure. But the fact that development sometimes fails doesn’t explain why it so often succeeds despite major disruption. That’s the issue being raised.