A High-Throughput Genome-Integrated Assay Reveals Spatial Dependencies Governing Tcf7l2 Binding

Szczesnik, Tomasz and Chu, Lendy and Ho, Joshua W.K. and Sherwood, Richard I. (2020) A High-Throughput Genome-Integrated Assay Reveals Spatial Dependencies Governing Tcf7l2 Binding. Cell Systems, 11 (3). pp. 315-327.e5. ISSN 24054712

[img]
Preview
Text
Szczesnik - Cell Systems, 2020.pdf
Available under License Creative Commons Attribution No Derivatives.

Download (7MB) | Preview
Link to published document: http://doi.org/10.1016/j.cels.2020.08.004

Abstract

Predicting where transcription factors bind in the genome from their in vitro DNA-binding affinity is confounded by the large number of possible interactions with nearby transcription factors. To characterize the in vivo binding logic for the Wnt effector Tcf7l2, we developed a high-throughput screening platform in which thousands of synthesized DNA phrases are inserted into a specific genomic locus, followed by measurement of Tcf7l2 binding by DamID. Using this platform at two genomic loci in mouse embryonic stem cells, we show that while the binding of Tcf7l2 closely follows the in vitro motif-binding strength and is influenced by local chromatin accessibility, it is also strongly affected by the surrounding 99 bp of sequence. Through controlled sequence perturbation, we show that Oct4 and Klf4 motifs promote Tcf7l2 binding, particularly in the adjacent approximately 50 bp and oscillating with a 10.8-bp phasing relative to these cofactor motifs, which matches the turn of a DNA helix.

Item Type: Article
Subjects: R Medicine > R Medicine (General)
Depositing User: Repository Administrator
Date Deposited: 28 Oct 2021 01:48
Last Modified: 28 Oct 2021 01:49
URI: http://eprints.victorchang.edu.au/id/eprint/1156

Actions (login required)

View Item View Item