Resumen de Genome-wide analysis of ETS-family DNA-binding in vitro and in vivo
Gong-Hong Wei, Gwenaël Badis, Michael Berger, Teemu Kivioja, Kimmo Palin, Martin Enge, Martin Bonke, Arttu Jolma, Markku Varjosalo, Andrew R Gehrke, Jian Yan, Shaheynoor Talukder, Mikko Turunen, Mikko Taipale, Hendrik G. Stunnenberg, Esko Ukkonen, Timothy R. Hughes, Martha L Bulyk, Jussi Taipale
Members of the large ETS family of transcription factors (TFs) have highly similar DNA-binding domains (DBDs)—yet they have diverse functions and activities in physiology and oncogenesis. Some differences in DNA-binding preferences within this family have been described, but they have not been analysed systematically, and their contributions to targeting remain largely uncharacterized. We report here the DNA-binding profiles for all human and mouse ETS factors, which we generated using two different methods: a high-throughput microwell-based TF DNA-binding specificity assay, and protein-binding microarrays (PBMs). Both approaches reveal that the ETS-binding profiles cluster into four distinct classes, and that all ETS factors linked to cancer, ERG, ETV1, ETV4 and FLI1, fall into just one of these classes. We identify amino-acid residues that are critical for the differences in specificity between all the classes, and confirm the specificities in vivo using chromatin immunoprecipitation followed by sequencing (ChIP-seq) for a member of each class. The results indicate that even relatively small differences in in vitro binding specificity of a TF contribute to site selectivity in vivo.
