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Hum Mol Genet. 2010 Apr 1;19(7):1153-64. doi: 10.1093/hmg/ddp585. Epub 2010 Jan 6.

The snoRNA MBII-52 (SNORD 115) is processed into smaller RNAs and regulates alternative splicing.

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  • 1Department of Molecular and Cellular Biochemistry, University of Kentucky, Lexington, KY 40536, USA.

Abstract

The loss of HBII-52 and related C/D box small nucleolar RNA (snoRNA) expression units have been implicated as a cause for the Prader-Willi syndrome (PWS). We recently found that the C/D box snoRNA HBII-52 changes the alternative splicing of the serotonin receptor 2C pre-mRNA, which is different from the traditional C/D box snoRNA function in non-mRNA methylation. Using bioinformatic predictions and experimental verification, we identified five pre-mRNAs (DPM2, TAF1, RALGPS1, PBRM1 and CRHR1) containing alternative exons that are regulated by MBII-52, the mouse homolog of HBII-52. Analysis of a single member of the MBII-52 cluster of snoRNAs by RNase protection and northern blot analysis shows that the MBII-52 expressing unit generates shorter RNAs that originate from the full-length MBII-52 snoRNA through additional processing steps. These novel RNAs associate with hnRNPs and not with proteins associated with canonical C/D box snoRNAs. Our data indicate that not a traditional C/D box snoRNA MBII-52, but a processed version lacking the snoRNA stem is the predominant MBII-52 RNA missing in PWS. This processed snoRNA functions in alternative splice-site selection. Its substitution could be a therapeutic principle for PWS.

PMID:
20053671
[PubMed - indexed for MEDLINE]
PMCID:
PMC2838533
Free PMC Article

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