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Article Dans Une Revue Disease Models & Mechanisms Année : 2023

A systematic approach identifies p53-DREAM pathway target genes associated with blood or brain abnormalities

Résumé

p53 (encoded by Trp53) is a tumor suppressor, but mouse models have revealed that increased p53 activity may cause bone marrow failure, likely through dimerization partner, RB-like, E2F4/E2F5 and MuvB (DREAM) complex-mediated gene repression. Here, we designed a systematic approach to identify p53-DREAM pathway targets, the repression of which might contribute to abnormal hematopoiesis. We used Gene Ontology analysis to study transcriptomic changes associated with bone marrow cell differentiation, then chromatin immunoprecipitation-sequencing (ChIP-seq) data to identify DREAM-bound promoters. We next created positional frequency matrices to identify evolutionary conserved sequence elements potentially bound by DREAM. The same approach was developed to find p53-DREAM targets associated with brain abnormalities, also observed in mice with increased p53 activity. Putative DREAM-binding sites were found for 151 candidate target genes, of which 106 are mutated in a blood or brain genetic disorder. Twenty-one DREAM-binding sites were tested and found to impact gene expression in luciferase assays, to notably regulate genes mutated in dyskeratosis congenita (Rtel1), Fanconi anemia (Fanca), Diamond–Blackfan anemia (Tsr2), primary microcephaly [Casc5 (or Knl1), Ncaph and Wdr62] and pontocerebellar hypoplasia (Toe1). These results provide clues on the role of the p53-DREAM pathway in regulating hematopoiesis and brain development, with implications for tumorigenesis.
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hal-04265058 , version 1 (30-10-2023)

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Jeanne Rakotopare, Vincent Lejour, Carla Duval, Eliana Eldawra, Hugues Escoffier, et al.. A systematic approach identifies p53-DREAM pathway target genes associated with blood or brain abnormalities. Disease Models & Mechanisms, 2023, 16 (10), ⟨10.1242/dmm.050376⟩. ⟨hal-04265058⟩
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