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PMID: 18296702 Published · ppublish English Journal Article Research Support, N.I.H., Extramural Research Support, Non-U.S. Gov't

Adaptive evolution of newly emerged micro-RNA genes in Drosophila.

Molecular biology and evolution ·Vol. 25 ·No. 5 ·2008-05-00 ·Pages 929-38

Lu J, Fu Y, Kumar S, Shen Y, Zeng K, Xu A, Carthew R, Wu CI

Abstract

How often micro-RNA (miRNA) genes emerged and how fast they evolved soon after their emergence are some of the central questions in the evolution of miRNAs. Because most known miRNA genes are ancient and highly conserved, these questions can be best answered by identifying newly emerged miRNA genes. Among the 78 miRNA genes in Drosophila reported before 2007, only 5 are confirmed to be newly emerged in the genus (although many more can be found in the newly reported data set; e.g., Ruby et al. 2007; Stark et al. 2007; Lu et al. 2008). These new miRNA genes have undergone numerous changes, even in the normally invariant mature sequences. Four of them (the miR-310/311/312/313 cluster, denoted miR-310s) were duplicated from other conserved miRNA genes. The fifth one (miR-303) appears to be a very young gene, originating de novo from a non-miRNA sequence recently. We sequenced these 5 miRNA genes and their neighboring regions from a worldwide collection of Drosophila melanogaster lines. The levels of divergence and polymorphism in these miRNA genes, vis-à-vis those of the neighboring DNA sequences, suggest that these 5 genes are evolving adaptively. Furthermore, the polymorphism pattern of miR-310s in D. melanogaster is indicative of hitchhiking under positive selection. Thus, a large number of adaptive changes over a long period of time may be essential for the evolution of newly emerged miRNA genes.

MeSH Terms
Adaptation, Biological Animals Drosophila/genetics Drosophila melanogaster/genetics Evolution, Molecular Genes, Insect MicroRNAs/genetics Polymorphism, Genetic
Chemicals
MicroRNAs
Authors & Affiliations
8 authors, click to expand affiliations / ORCID
Lu Jian
Department of Ecology and Evolution, University of Chicago, USA.
Fu Yonggui
Kumar Supriya
Shen Yang
Zeng Kai
Xu Anlong
Carthew Richard
Wu Chung-I
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Article Info
Journal
Molecular biology and evolution
Abbr.
Mol Biol Evol
ISSN
1537-1719
Published
2008-05-00
Epub
2008-00-22
Pages
929-38
Language
English
Region
United States
NLM ID
8501455
PMCID
PMC3707409
Subset
IM
Grants
NIGMS NIH HHS · R01 GM068743 · United States
NIGMS NIH HHS · R01 GM077581 · United States
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