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Impact of cancer mutational signatures on transcription factor motifs in the human genome

Chan, Calvin Wing Yiu ; Gu, Zuguang ; Bieg, Matthias ; Eils, Roland ; Herrmann, Carl

In: BMC medical genomics, 12 (2019), Nr. 64. pp. 1-14. ISSN 1755-8794

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Abstract

Background: Somatic mutations in cancer genomes occur through a variety of molecular mechanisms, which contribute to different mutational patterns. To summarize these, mutational signatures have been defined using a large number of cancer genomes, and related to distinct mutagenic processes. Each cancer genome can be compared to this reference dataset and its exposure to one or the other signature be determined. Given the very different mutational patterns of these signatures, we anticipate that they will have distinct impact on genomic elements, in particular motifs for transcription factor binding sites (TFBS).

Methods: We used the 30 mutational signatures from the COSMIC database, and derived a theoretical framework to infer the impact of these signatures on the alteration of transcription factor (TF) binding motifs from the JASPAR database. Hence, we translated the trinucleotide mutation frequencies of the signatures into alteration frequencies of specific TF binding motifs, leading either to creation or disruption of these motifs.

Results: Motif families show different susceptibility to alterations induced by the mutational signatures. For certain motifs, a high correlation is observed between the TFBS motif creation and disruption events related to the information content of the motif. Moreover, we observe striking patterns regarding for example the Ets-motif family, for which a high impact of UV induced signatures is observed. Our model also confirms the susceptibility of specific transcription factor motifs to deamination processes.

Conclusion: Our results show that the mutational signatures have different impact on the binding motifs of transcription factors and that for certain high complexity motifs there is a strong correlation between creation and disruption, related to the information content of the motif. This study represents a background estimation of the alterations due purely to mutational signatures in the absence of additional contributions, e.g. from evolutionary processes.

Item Type: Article
Journal or Publication Title: BMC medical genomics
Volume: 12
Number: 64
Publisher: BioMed Central
Place of Publication: London
Date Deposited: 29 May 2019 12:31
Date: 2019
ISSN: 1755-8794
Page Range: pp. 1-14
Faculties / Institutes: Service facilities > German Cancer Research Center (DKFZ)
Subjects: 570 Life sciences
610 Medical sciences Medicine
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