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© Research
Publication : The Biochemical journal

SMAD 8 binding to mice Msx1 basal promoter is required for transcriptional activation

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in The Biochemical journal - 17 Jul 2015

Binato R, Alvarez Martinez CE, Pizzatti L, Robert B, Abdelhay E

Link to Pubmed [PMID] – 16101586

Biochem. J. 2006 Jan;393(Pt 1):141-50

The Msx1 gene in mice has been proven to be induced by BMP (bone morphogenetic protein) proteins, and three binding sites for SMAD, an intracellular BMP signalling transducer, have already been identified in its promoter. Gel shift analyses were performed and they demonstrated that the consensus found very near the transcription start site, a region designed BP (basal promoter), is functional for binding nuclear proteins from 10.5, 11.5 and 13.5 dpc (days post-coitum) embryos. Notably, this binding occurs only when the SMAD-binding consensus sequence is maintained, suggesting that it is required for the formation of a protein complex over BP. Binding of purified SMAD 1 and SMAD 4 as well as supershift assay with SMAD 1/SMAD 5/SMAD 8 antibody proved that a SMAD protein is present in this complex. Transfection assays in cell cultures with fragments from BP driving the expression of luciferase confirmed that only in the presence of the SMAD consensus site is Msx1 expression activated. A proteomic analysis of the complex components after immunoprecipitation identified several proteins necessary to activate transcription including SMAD 8. Our results suggest that BMP2/BMP4 signalling through SMAD 8 is required for transcriptional activation of the mouse Msx1 gene.

http://www.ncbi.nlm.nih.gov/pubmed/16101586