dc.contributor.authorPhua, Calista Sze Lynn
dc.identifier.citationPhua, C. S. L. (2012). Characterization of the murine hoxd4 and hox-associated miR-10b transcripts. Doctoral thesis, Nanyang Technological University, Singapore.
dc.description.abstractPatterning of the animal embryo’s anterior-posterior axis is dependent on spatially and temporally regulated Hox gene expression. The murine Hoxd4 gene has been proposed to harbour two promoters, an upstream promoter P2, and a downstream promoter P1, that lie 5.2 and 1.1 kilobase pairs (kb) upstream of the coding region respectively. The evolutionarily conserved microRNA-10b (miR-10b) gene lies in the Hoxd4 genomic locus in the fourth intron separating exons 4 and 5 of the P2 transcript and is directly adjacent to the proposed P1 promoter. Hoxd4 transcription is regulated by a 3’ neural enhancer that harbours a retinoic acid response element (RARE). Here, we show that the expression profiles of Hoxd4 and miR-10b transcripts during neural differentiation of mouse embryonal carcinoma P19 cells are co-ordinately regulated, suggesting that both Hoxd4 and miR-10b expression are governed by the neural enhancer. Our observation that P1 transcripts are uncapped, together with the mapping of their 5’ ends, strongly suggests that they are generated by Drosha cleavage of P2 transcripts rather than by transcriptional initiation. This is supported by the co-localization of P1 and P2 transcripts to the same posterior expression domain in the mouse embryo. These uncapped P1 transcripts do not appear to possess an Internal Ribosomal Entry Site (IRES), but accumulate within multiple punctate bodies within the nucleus suggesting that they play a functional role. Finally, similar uncapped Drosha-cleaved P1-like transcripts originating from the paralogous Hoxb4/miR-10a locus were also identified. We propose that these transcripts may belong to a novel class of regulatory RNAs.en_US
dc.format.extent145 p.en_US
dc.subjectDRNTU::Science::Biological sciences::Molecular biologyen_US
dc.titleCharacterization of the murine hoxd4 and hox-associated miR-10b transcriptsen_US
dc.contributor.schoolSchool of Biological Sciencesen_US
dc.contributor.supervisorMark Stephen Featherstoneen_US
dc.description.degreeDOCTOR OF PHILOSOPHY (SBS)en_US

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