Abstract |
Mutations in phosphoribosyl pyrophosphate synthetase 1 (PRPS1) are associated with a spectrum of non-syndromic to syndromic hearing loss. PRPS1 transcript levels have been shown to be regulated by the microRNA-376 genes. The long primary RNA transcript of the miR-376 RNA cluster members undergo extensive and simultaneous A → I editing at one or both of two specific sites (+4 and +44) in particular human and mouse tissues. The PRPS1 gene, which contains target sites for the edited version of miR-376a-5p within its 3'UTR, has been shown to be repressed in a tissue-specific manner. To investigate whether the transcription of Prps1 is regulated by miR-376 cluster members in the mouse inner ear, we first quantified the expression of the mature miR-376 RNAs by quantitative real-time-PCR. The spatio-temporal patterns of miR-376 expression were assessed by in situ hybridization. Finally, we examined whether A →I editing of pri-miR-376 RNAs occurs in mouse inner ear by direct sequencing. Our data showed that the miR-376a-3p, b-3p, c-3p are present in mouse embryonic inner ears and intensive expression of miR-376a-3p/b-3p was detected in the sensory epithelia and ganglia of both auditory and vestibular portions of the inner ear. In adult inner ear, the expression of miR-376a-3p/b-3p is restricted within ganglion neurons of auditory and vestibular systems as well as the cells in the stria vascularis. Only unedited pri-miR-376 RNAs were detected in the cochlea suggesting that the activity of PRPS1 in the inner ear may not be regulated through the editing of miR-376 cluster.
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Authors | Denise Yan, Yazhi Xing, Xiaomei Ouyang, Juhong Zhu, Zheng-Yi Chen, Hainan Lang, Xue Z Liu |
Journal | International journal of experimental pathology
(Int J Exp Pathol)
Vol. 93
Issue 6
Pg. 450-7
(Dec 2012)
ISSN: 1365-2613 [Electronic] England |
PMID | 23136997
(Publication Type: Journal Article, Research Support, N.I.H., Extramural)
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Copyright | © 2012 The Authors. International Journal of Experimental Pathology © 2012 International Journal of Experimental Pathology. |
Chemical References |
- MicroRNAs
- Ribose-Phosphate Pyrophosphokinase
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Topics |
- Animals
- Cochlea
(embryology, enzymology)
- Ear, Inner
(embryology, enzymology)
- Female
- Gene Expression Regulation
- Hair Cells, Auditory, Inner
(enzymology)
- In Situ Hybridization
- Male
- Mice
- Mice, Inbred C57BL
- MicroRNAs
(genetics)
- Neurons
(enzymology)
- Real-Time Polymerase Chain Reaction
- Ribose-Phosphate Pyrophosphokinase
(genetics)
- Vestibule, Labyrinth
(embryology, enzymology)
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