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- Title
Expression of the 22 nucleotide let-7 heterochronic RNA throughout the Metazoa: a role in life history evolution?
- Authors
Pasquinelli, Amy E; McCoy, Adam; Jiménez, Eva; Saló, Emili; Ruvkun, Gary; Martindale, Mark Q; Baguñà, Jaume
- Abstract
The 22 nucleotide let-7 small temporal RNA has been found consistently in samples from diverse bilateria but not from sponge or cnidarians. Here we further examine the phylogenetic distribution of this regulatory RNA by sampling representatives of diverse metazoan lineages. The 22 nucleotide let-7 RNA is detectable in triclad and polyclad platyhelminths, nemertean, and chaetognath but not ctenophore or acoel metazoans. These results support recent arguments that acoels are distinct from other acoelomate platyhelminths. We argue that let-7 is not a bilaterian or triploblast synapomorphy but instead evolved later in metazoan evolution, perhaps in association with complex life history traits.
- Publication
Evolution & development, 2003, Vol 5, Issue 4, p372
- ISSN
1520-541X
- Publication type
Journal Article
- DOI
10.1046/j.1525-142x.2003.03044.x