Abstract
Homeobox genes are among the most deeply conserved families of transcription factor-encoding genes. Following their discovery in Drosophila, homeobox genes arrived on the Caenorhabditis elegans stage with a vengeance. Between 1988 and 1990, just a few years after their initial discovery in flies and vertebrates, positional cloning and sequence-based searches showed that C. elegans contains HOX cluster genes, an apparent surprise given the simplicity and non-segmented body plan of the nematode, as well as many other non-clustered homeobox genes of all major subfamilies (e.g. LIM, POU, etc.). Not quite 40 years later, we have an exceptionally deep understanding of homeodomain protein expression and function in C. elegans, revealing their prevalent role in nervous system development. In this Spotlight, we provide a historical perspective and a non-comprehensive journey through the C. elegans homeobox field and discuss open questions and future directions.
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