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Composition and Expression of Conserved MicroRNA Genes in Diploid Cotton (Gossypium) Species
Genome Biology and Evolution
  • Lei Gong, Iowa State University
  • Atul Kakrana, University of Delaware
  • Siwaret Arikit, University of Delaware
  • Blake C. Meyers, University of Delaware
  • Jonathan F. Wendel, Iowa State University
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MicroRNAs are ubiquitous in plant genomes but vary greatly in their abundance within and conservation among plant lineages. To gain insight into the evolutionary birth/death dynamics of microRNA families, we sequenced small RNA and 50-end PARE libraries generated from two closely related species of Gossypium. Here, we demonstrate that 33 microRNA families, with similar copy numbers and average evolutionary rates, are conserved in the two congeneric cottons. Analysis of the presence/absence of these microRNA families in other land plants sheds light on their depth of phylogenetic origin and lineage-specific loss/gain. Conserved microRNA families in Gossypium exhibit a striking interspecific asymmetry in expression, potentially connected to relative proximity to neighboring transposable elements. A complex correlated expression pattern of microRNA target genes with their controlling microRNAs indicates that possible functional divergence of conserved microRNA families can also exist even within a single plant genus.

This article is from Genome Biology and Evolution 5 (2013): 2449, doi:10.1093/gbe/evt196. Posted with permission.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
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Lei Gong, et al.
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Lei Gong, Atul Kakrana, Siwaret Arikit, Blake C. Meyers, et al.. "Composition and Expression of Conserved MicroRNA Genes in Diploid Cotton (Gossypium) Species" Genome Biology and Evolution Vol. 5 Iss. 12 (2013) p. 2449 - 2459
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