Victor Ambros

In 1993, while studying the nematode Caenorhabditis elegans, Ambros discovered that the lin-4 gene does not code for a protein but instead produces a very short RNA molecule (about 22 nucleotides long) that regulates the expression of another gene, lin-14. This was the first identified microRNA (miRNA), revealing an entirely new mechanism of gene regulation.

Yes, Victor Ambros and Gary Ruvkun were awarded the 2024 Nobel Prize in Physiology or Medicine for the discovery of microRNA and its role in post-transcriptional gene regulation. Their independent discoveries in the early 1990s, initially considered a curiosity specific to worms, were later shown to be a universal regulatory mechanism found across plants, animals, and humans.

Ambros was studying mutations in C. elegans that caused developmental timing defects, mapping the lin-4 gene's location and cloning the DNA region. He found that lin-4 produced tiny non-coding RNA transcripts rather than a messenger RNA for protein, a result so unexpected that the 1993 Cell paper was initially met with skepticism from much of the scientific community.

Ambros is a professor at the University of Massachusetts Medical School (UMMS) in Worcester, Massachusetts, where he has conducted much of his microRNA research. He was at Harvard and Dartmouth before joining UMass, where he has been part of a prominent RNA biology research community.