For an animal to develop normally, cells must not only become the right types but also do so at the right time. In the worm C. elegans, the protein LIN28 has long been known as an important regulator of this timing: It keeps cells in a flexible state and delays their shift toward adult-like forms. In humans and other mammals, related LIN28 proteins have been associated with the timing of puberty.
Because LIN28 binds many RNAs, scientists have viewed it as a regulator of large networks of genes. But a new study by researchers in the Grosshans lab suggests that its role is much more focused, at least in worms. The team found that although LIN28 attaches to many RNA molecules, only two seem to be essential for its role in development. One is a conserved regulator that helps cells move toward more mature states.
The paper is published in the journal PLOS Biology.
Two targets drive the effect
When the researchers removed these two molecules in animals that also lacked LIN28, the developmental changes normally caused by LIN28 loss disappeared. But when they increased the levels of both molecules in animals with reduced LIN28 function, the worms began to resemble animals missing LIN28. In those animals, vulval development began too early, leading to a visible protruding vulva.
Animals lacking LIN28 also skipped part of the normal larval program, yet some larval stages lasted longer, suggesting that LIN28 helps coordinate both developmental identity and the pace of development.
A narrower model of timing
The study offers a simpler view of how biological timing can be controlled through a small set of molecules, says senior author Helge Grosshans. The findings, he adds, also raise a question for future work: "How often do broad molecular interactions boil down to a few targets that carry most of the biological effect?"
Publication details
Jana Brunner et al, let-7 miRNA and lin-46 mRNA are essential targets of the LIN28 RNA-binding protein in Caenorhabditis elegans developmental timing regulation, PLOS Biology (2026). DOI: 10.1371/journal.pbio.3003892
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Citation: A small molecular module helps time development of C. elegans (2026, August 5) retrieved 6 August 2026 from https://phys.org/news/2026-08-small-molecular-module-elegans.html
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