EPISODE 50: Fed by Mum, Built by Ribosomes

Welcome to the next episode of the WOrM Podcast 🪱

Today we’re talking about inheritance.

Not DNA.

Not small RNAs.

Not epigenetics.

But ribosomes.

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🧬 The central idea

When mother worms experience dietary restriction, their offspring hatch with fewer ribosomal proteins.

That matters because ribosomes are the machinery that make proteins.

Less ribosome capacity means slower early growth.

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🔬 What they found

The authors compared worms fed normally with worms under dietary restriction.

In the mothers, dietary restriction changed the proteome broadly.

But in the offspring, most protein changes were reset.

The big exception was ribosomal proteins.

These stayed reduced in the next generation.

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🐣 What happens to the offspring?

Offspring from diet-restricted mothers hatched smaller and grew more slowly during early larval development.

But this delay was temporary.

As the larvae rebuilt normal ribosome levels, their growth recovered.

So the maternal diet leaves a short-term biological imprint on early growth.

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⚙️ Is it causal?

Yes.

When the authors directly reduced a ribosomal protein in mothers using auxin-induced degradation, the offspring also grew more slowly.

That shows reduced ribosome abundance is not just correlated with slower growth.

It can help cause it.

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🧠 The signalling link

The study also points to mTORC1 signalling, through RAGA-1, as part of the mechanism.

Maternal RAGA-1 depletion reduced ribosomal protein levels in offspring.

Interestingly, this depended on tissue context.

Pharynx-specific depletion had an effect.

Epidermal depletion did not.

So this is not just “slow mother equals slow offspring”.

It is a specific physiological signal crossing from soma to germline.

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🧠 The take-home message

Dietary restriction does not simply rewrite the whole offspring proteome.

Most of the proteome resets.

But ribosomes are different.

Maternal diet shapes how much translational machinery offspring receive, and that changes how fast they grow when life begins.

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📄 Paper discussed

Pradhan, S.; Stojanovski, K.; Dellemann, F.; Psalmon, S.; Tuomaala, J.; Stroustrup, N. E.; Towbin, B. D. (2026)

Dietary restriction shapes intergenerational ribosome abundance and early growth of Caenorhabditis elegans offspring

PLOS Biology

https://doi.org/10.1371/journal.pbio.3003692

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