Nucleic Acids Research Advance Access published online on August 28, 2007
Nucleic Acids Research, doi:10.1093/nar/gkm641
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Tissue-dependent paired expression of miRNAs
Department of Physiology and Cell Biology, University of Nevada School of Medicine, Reno, NV 89557, USA
*To whom correspondence should be addressed. Tel: 775 784 7765; Fax: 775 784 6903; Email: wyan{at}medicine.nevada.edu
Received May 21, 2007. Revised August 2, 2007. Accepted August 3, 2007.
It is believed that depending on the thermodynamic stability of the 5'-strand and the 3'-strand in the stem-loop structure of a precursor microRNA (pre-miRNA), cells preferentially select the less stable one (called the miRNA or guide strand) and destroy the other one (called the miRNA* or passenger strand). However, our expression profiling analyses revealed that both strands could be co-accumulated as miRNA pairs in some tissues while being subjected to strand selection in other tissues. Our target prediction and validation assays demonstrated that both strands of a miRNA pair could target equal numbers of genes and that both were able to suppress the expression of their target genes. Our finding not only suggests that the numbers of miRNAs and their targets are much greater than what we previously thought, but also implies that novel mechanisms are involved in the tissue-dependent miRNA biogenesis and target selection process.
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