Kumar , B. and Uppuladinne, M.V. and Jani, V. and Sonavane , U and Joshi , R.R. and Bapat , S.A. (2015) Auto-regulation of Slug mediates its activity during epithelial to mesenchymal transition. Biochimica et Biophysica Acta (BBA) - Gene Regulatory Mechanisms, 1849 (9). pp. 1209-1219.

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Abstract

Slug, a five C2H2 zinc finger (ZF) motif transcription factor mediates cell migration in development, adult tissue repair and regeneration, as well as during tumor metastases through epithelial to mesenchymal transition. At the molecular level, this involves interactions with E-box (CACC/GGTG) consensus elements within target gene promoters to achieve transcriptional repression. However, precise elucidation of events involved in this DNA recognition and binding of specific promoters to regulate target genes have not been achieved. In the present study, we show that besides transcriptional repression, Slug can also directly activate its own expression by preferential binding to specific E-box elements in the distal binding region of its promoter. Our findings suggest that while the first ZF does not contribute to the transcription-associated functions of Slug, all the remaining four ZFs are involved in regulating the expression of target genes with ZF3 and ZF4 being more crucial than ZF2 or ZF5. We also report that recognition and binding preferences of ZFs are defined through intrinsic differences in the E-box core base pairs and/or flanking sequences, with the S2 E-box element being most critical during autoregulation. However, specific target E-box recognition and binding are also defined by the cellular context, which implies that in silico and/or biochemical DNA binding preferences may not necessarily be able to accurately predict in situ events. Our studies thus constitute a novel understanding of transcriptional regulation.

Item Type:	Article
Additional Information:	This is Open access article for full text click above weblink
Subjects:	Stem Cell Biology
Depositing User:	Mr. Rameshwar Nema
Date Deposited:	01 Sep 2015 09:36
Last Modified:	19 Feb 2016 08:23
URI:	http://nccs.sciencecentral.in/id/eprint/197

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