Document Type
Article
Publication Date
1-1-2009
Publication Title
BioEssays
Department
Department of Biological Sciences
Abstract
One of the most interesting challenges facing paleobiologists is explaining the Cambrian explosion, the dramatic appearance of most metazoan animal phyla in the Early Cambrian, and the subsequent stability of these body plans over the ensuing 530 million years. We propose that because phenotypic variation decreases through geologic time, because microRNAs (miRNAs) increase genic precision, by turning an imprecise number of mRNA transcripts into a more precise number of protein molecules, and because miRNAs are continuously being added to metazoan genomes through geologic time, miRNAs might be instrumental in the canalization of development. Further, miRNAs ultimately allow for natural selection to elaborate morphological complexity, because by reducing gene expression variability, miRNAs increase heritability, allowing selection to change characters more effectively. Hence, miRNAs might play an important role in shaping metazoan macroevolution, and might be part of the solution to the Cambrian conundrum.
DOI
10.1002/bies.200900033
Dartmouth Digital Commons Citation
Dietrich, Michael; McPeek, Mark; and Peterson, Kevin J., "MicroRNAs and metazoan macroevolution: insights into canalization, complexity, and the Cambrian explosion" (2009). Dartmouth Scholarship. 11.
https://digitalcommons.dartmouth.edu/facoa/11