Title
Selective activation of alternative MYC core promoters by Wnt-responsive enhancers
Date Issued
01 June 2018
Access level
open access
Resource Type
journal article
Author(s)
Wieser E.
Kawaji H.
Murakawa Y.
Darzacq X.
University of California
Publisher(s)
MDPI AG
Abstract
In Metazoans, transcription of most genes is driven by the use of multiple alternative promoters. Although the precise regulation of alternative promoters is important for proper gene expression, the mechanisms that mediates their differential utilization remains unclear. Here, we investigate how the two alternative promoters (P1, P2) that drive MYC expression are regulated. We find that P1 and P2 can be differentially regulated across cell-types and that their selective usage is largely mediated by distal regulatory sequences. Moreover, we show that in colon carcinoma cells, Wnt-responsive enhancers preferentially upregulate transcription from the P1 promoter using reporter assays and in the context of the endogenous Wnt induction. In addition, multiple enhancer deletions using CRISPR/Cas9 corroborate the regulatory specificity of P1. Finally, we show that preferential activation between Wnt-responsive enhancers and the P1 promoter is influenced by the distinct core promoter elements that are present in the MYC promoters. Taken together, our results provide new insight into how enhancers can specifically target alternative promoters and suggest that formation of these selective interactions could allow more precise combinatorial regulation of transcription initiation.
Volume
9
Issue
6
Language
English
OCDE Knowledge area
Bioquímica, Biología molecular Oncología
Scopus EID
2-s2.0-85047954939
Source
Genes
ISSN of the container
20734425
DOI of the container
10.3390/genes9060270
Sponsor(s)
Acknowledgments: We thank Gina Dailey for help with designing plasmids, and the Tjian-Darzacq Lab as well as the Doudna Lab for critical comments and discussion while preforming this work. We thank Jennifer Doudna and Yoshihide Hayashizaki for their comments and feedback though out this project. We thank Robert Tjian for discussions and critical reading of the manuscript. We also want to thank Kartoosh Heydari at the Li Ka Shing Facility for flow cytometry assistance. This work was supported by NIH grant U54-DK107980 and by the California Institute of Regenerative Medicine grant LA1-08013 to X.D.
Sources of information: Directorio de Producción Científica Scopus