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Evol Bioinform Online. 2014 Jul 14;10:107-13. doi: 10.4137/EBO.S13739. eCollection 2014.

Regulation of Human PAX6 Expression by miR-7.

Evolutionary bioinformatics online

Maria Needhamsen, Robert B White, Keith M Giles, Sarah A Dunlop, Meghan G Thomas

Affiliations

  1. Parkinson's Centre (ParkC), School of Medical Sciences, Edith Cowan University, Joondalup, Western Australia, Australia. ; Experimental and Regenerative Neurosciences (EaRN), School of Animal Biology, University of Western Australia, Crawley, Western Australia, Australia.
  2. Parkinson's Centre (ParkC), School of Medical Sciences, Edith Cowan University, Joondalup, Western Australia, Australia. ; Experimental and Regenerative Neurosciences (EaRN), School of Animal Biology, University of Western Australia, Crawley, Western Australia, Australia. ; School of Anatomy, Physiology and Human Biology, University of Western Australia, Crawley, Western Australia, Australia.
  3. Harry Perkins Institute of Medical Research, Nedlands, Western Australia, Australia.
  4. Experimental and Regenerative Neurosciences (EaRN), School of Animal Biology, University of Western Australia, Crawley, Western Australia, Australia.

PMID: 25089088 PMCID: PMC4116382 DOI: 10.4137/EBO.S13739

Abstract

The paired box gene 6 (PAX6) is a powerful mediator of eye and brain organogenesis whose spatiotemporal expression is exquisitely controlled by multiple mechanisms, including post-transcriptional regulation by microRNAs (miRNAs). In the present study, we use bioinformatic predictions to identify three candidate microRNA-7 (miR-7) target sites in the human PAX6 3' untranslated region (3'-UTR) and demonstrate that two of them are functionally active in a human cell line. Furthermore, transient transfection of cells with synthetic miR-7 inhibits PAX6 protein expression but does not alter levels of PAX6 mRNA, suggesting that miR-7 induces translational repression of PAX6. Finally, a comparison of PAX6 3'-UTRs across species reveals that one of the functional miR-7 target sites is conserved, whereas the second functional target site is found only in primates. Thus, the interaction between PAX6 and miR-7 appears to be highly conserved; however, the precise number of sites through which this interaction occurs may have expanded throughout evolution.

Keywords: 3′-UTR; PAX6; miR-7; miRNA

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