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Enhancer–promoter interactions are encoded by complex genomic signatures on looping chromatin

Abstract

Discriminating the gene target of a distal regulatory element from other nearby transcribed genes is a challenging problem with the potential to illuminate the causal underpinnings of complex diseases. We present TargetFinder, a computational method that reconstructs regulatory landscapes from diverse features along the genome. The resulting models accurately predict individual enhancer–promoter interactions across multiple cell lines with a false discovery rate up to 15 times smaller than that obtained using the closest gene. By evaluating the genomic features driving this accuracy, we uncover interactions between structural proteins, transcription factors, epigenetic modifications, and transcription that together distinguish interacting from non-interacting enhancer–promoter pairs. Most of this signature is not proximal to the enhancers and promoters but instead decorates the looping DNA. We conclude that complex but consistent combinations of marks on the one-dimensional genome encode the three-dimensional structure of fine-scale regulatory interactions.

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Figure 1: Predictive power of promoter-proximal genomic features.
Figure 2: Ratio of the CTCF and RAD21 ChIP-seq signals occurring within interacting enhancers and non-interacting enhancers, anchored at peaks for CTCF, RAD21, and the transcription factors CUX1 and HCFC1 for the K562 cell line.
Figure 3: Predicting a chromatin loop that skips over multiple active promoters in K562 cells.
Figure 4: The TargetFinder pipeline.
Figure 5: TargetFinder performance by cell line, model type, and number of features.
Figure 6: Predictive importance of genomic features across cell lines and regions.
Figure 7: Influence of features by region.
Figure 8: Identification of complex interactions between DNA-binding proteins and epigenetic marks.

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Acknowledgements

This project was supported by the Bench to Bassinet Program of the NHLBI (U01HL098179 and UM1HL098179), the NIH/NHLBI (HL089707), the San Simeon Fund, and the Gladstone Institutes.

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S.W., R.M.T., and K.S.P. designed the experiments and wrote the manuscript. S.W. and R.M.T. implemented the experiments.

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Correspondence to Sean Whalen or Katherine S Pollard.

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The authors declare no competing financial interests.

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Whalen, S., Truty, R. & Pollard, K. Enhancer–promoter interactions are encoded by complex genomic signatures on looping chromatin. Nat Genet 48, 488–496 (2016). https://doi.org/10.1038/ng.3539

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