Abstract
Disease-causing mutations in genes encoding transcription factors (TFs) can affect TF interactions with their cognate DNA-binding motifs. Whether and how TF mutations impact upon the binding to TF composite elements (CE) and the interaction with other TFs is unclear. Here, we report a distinct mechanism of TF alteration in human lymphomas with perturbed B cell identity, in particular classic Hodgkin lymphoma. It is caused by a recurrent somatic missense mutation c.295 T > C (p.Cys99Arg; p.C99R) targeting the center of the DNA-binding domain of Interferon Regulatory Factor 4 (IRF4), a key TF in immune cells. IRF4-C99R fundamentally alters IRF4 DNA-binding, with loss-of-binding to canonical IRF motifs and neomorphic gain-of-binding to canonical and non-canonical IRF CEs. IRF4-C99R thoroughly modifies IRF4 function by blocking IRF4-dependent plasma cell induction, and up-regulates disease-specific genes in a non-canonical Activator Protein-1 (AP-1)-IRF-CE (AICE)-dependent manner. Our data explain how a single mutation causes a complex switch of TF specificity and gene regulation and open the perspective to specifically block the neomorphic DNA-binding activities of a mutant TF.
Original language | English |
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Article number | 6947 |
Number of pages | 18 |
Journal | Nature Communications |
Volume | 14 |
Issue number | 1 |
DOIs | |
Publication status | Published - 7 Nov 2023 |
Bibliographical note
Funding:Open Access funding enabled and organized by Projekt DEAL.
Copyright:
© 2023. The Author(s).
Keywords
- Humans
- Interferon Regulatory Factors/genetics
- Lymphoma/genetics
- Gene Expression Regulation
- B-Lymphocytes/metabolism
- DNA