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. Author manuscript; available in PMC: 2022 Jan 11.
Published in final edited form as: Mol Cell. 2021 Dec 9;82(1):140–158.e12. doi: 10.1016/j.molcel.2021.11.016

Figure 6. The topoisome engages promoters and enhancers to favor transcription.

Figure 6.

(A) Scheme of “cross-CAD” assay. CPT increased engagement of TOP2A as well as TOP1 in the presence of MYC, while Eto increased engagement of TOP1 as well as TOP2A. Red dots with Y indicate the active site of TOP1 (Y723) or TOP2 (Y805).

(B) Detection of MYC-tethered TOP1 along with Eto-trapped TOP2Acc by cross-CAD assays in HO15.19-MYC-ER cells with or without Tam with anti-TOP1.

(C) As in (B) but in Dox-induced U2OS-MYC-EGFP cells.

(D) Genome Browser of TOP1 cross-CAD-seq (RPM) showing two pairs of divergent promoters (dashed boxes).

(E and F) Average TOP1 cross-CAD-seq (RPM) at all RNAPII genes (between TSS and transcription end site [TES]) (E) or at highly (75%–100%; Q, quartile) expressed genes (F) and at active enhancers (G) in U2OS cells.

See also Figure S6 and Table S2.