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TMPRSS2-ERG and gain-of-function p53 mutants co-dictate pyrimidine synthesis and prostate cancer fitness

ABSTRACT: This SuperSeries is composed of the SubSeries listed below.

ORGANISM(S): Mus musculus Homo sapiens

PROVIDER: GSE184626 | GEO | 2023/06/26

REPOSITORIES: GEO

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TMPRSS2-ERG and gain-of-function p53 mutants co-dictate pyrimidine synthesis and prostate cancer fitness [ERG and p53 ChIP-seq]

Project description:TMPRSS2-ERG fusion is the most common genetic alteration in prostate cancer (PCa) and TP53 is the most frequently mutated gene in human cancers. However, their precise roles in PCa pathogenesis remain elusive. Here we showed that TMPRSS2-ERG fusion co-occurred with TP53 deletion/mutation in PCa patient specimens. ERG overexpression and Trp53 knockout/R172H mutant knockin induced pyrimidine synthesis gene (PSG) expression and prostate tumorigenesis in mice. Gain-of-function p53 mutants bound to the CTNNB1 promoter and upregulated β-Catenin. Overexpressed ERG and β-Catenin co-occupied PSG loci and mediated PSG expression, and high PSG expression associated with increased β-Catenin level and poor overall survival of PCa patients. β-Catenin inhibition by proteolysis-targeting chimeras (PROTACs) of its co-activator CBP and partner proteins LEF1/TCFs blocked ERG/p53-mutant PCa growth. Our study identifies CTNNB1 as a transcriptional target of p53 GOF-mutants, and reveals a druggable dependency on β-Catenin and pyrimidine synthesis in p53-mutated cancers with or without TMPRSS2-ERG fusion.

2023-06-27 | GSE184623 | GEO

TMPRSS2-ERG and gain-of-function p53 mutants co-dictate pyrimidine synthesis and prostate cancer fitness [RNA-seq-2021 ERG-p53 project]

2023-06-27 | GSE184625 | GEO

TMPRSS2-ERG and gain-of-function p53 mutants co-dictate pyrimidine synthesis and prostate cancer fitness [RNA-seq-2018 ERG-p53 project]

2023-06-27 | GSE184624 | GEO

TMPRSS2-ERG and gain-of-function p53 mutants co-dictate pyrimidine synthesis and prostate cancer fitness

Project description:TMPRSS2-ERG and gain-of-function p53 mutants co-dictate pyrimidine synthesis and prostate cancer fitness

| PRJNA765377 | ENA

TMPRSS2-ERG and gain-of-function p53 mutants co-dictate pyrimidine synthesis and prostate cancer fitness [ERG and p53 ChIP-seq]

Project description:TMPRSS2-ERG and gain-of-function p53 mutants co-dictate pyrimidine synthesis and prostate cancer fitness [ERG and p53 ChIP-seq]

| PRJNA765379 | ENA

TMPRSS2-ERG and gain-of-function p53 mutants co-dictate pyrimidine synthesis and prostate cancer fitness [RNA-seq-2018 ERG-p53 project]

Project description:TMPRSS2-ERG and gain-of-function p53 mutants co-dictate pyrimidine synthesis and prostate cancer fitness [RNA-seq-2018 ERG-p53 project]

| PRJNA765380 | ENA

TMPRSS2-ERG and gain-of-function p53 mutants co-dictate pyrimidine synthesis and prostate cancer fitness [RNA-seq-2021 ERG-p53 project]

Project description:TMPRSS2-ERG and gain-of-function p53 mutants co-dictate pyrimidine synthesis and prostate cancer fitness [RNA-seq-2021 ERG-p53 project]

| PRJNA765381 | ENA

Gain-of-function mutant p53 together with ERG proto-oncogene drive prostate cancer by beta-catenin activation and pyrimidine synthesis.

Project description:Whether TMPRSS2-ERG fusion and TP53 gene alteration coordinately promote prostate cancer (PCa) remains unclear. Here we demonstrate that TMPRSS2-ERG fusion and TP53 mutation / deletion co-occur in PCa patient specimens and this co-occurrence accelerates prostatic oncogenesis. p53 gain-of-function (GOF) mutants are now shown to bind to a unique DNA sequence in the CTNNB1 gene promoter and transactivate its expression. ERG and β-Catenin co-occupy sites at pyrimidine synthesis gene (PSG) loci and promote PSG expression, pyrimidine synthesis and PCa growth. β-Catenin inhibition by small molecule inhibitors or oligonucleotide-based PROTAC suppresses TMPRSS2-ERG- and p53 mutant-positive PCa cell growth in vitro and in mice. Our study identifies a gene transactivation function of GOF mutant p53 and reveals β-Catenin as a transcriptional target gene of p53 GOF mutants and a driver and therapeutic target of TMPRSS2-ERG- and p53 GOF mutant-positive PCa.

| S-EPMC10400651 | biostudies-literature

Gain-of-function p53 mutants co-opt chromatin pathways to drive cancer growth.

Project description:TP53 (which encodes p53 protein) is the most frequently mutated gene among all human cancers. Prevalent p53 missense mutations abrogate its tumour suppressive function and lead to a 'gain-of-function' (GOF) that promotes cancer. Here we show that p53 GOF mutants bind to and upregulate chromatin regulatory genes, including the methyltransferases MLL1 (also known as KMT2A), MLL2 (also known as KMT2D), and acetyltransferase MOZ (also known as KAT6A or MYST3), resulting in genome-wide increases of histone methylation and acetylation. Analysis of The Cancer Genome Atlas shows specific upregulation of MLL1, MLL2, and MOZ in p53 GOF patient-derived tumours, but not in wild-type p53 or p53 null tumours. Cancer cell proliferation is markedly lowered by genetic knockdown of MLL1 or by pharmacological inhibition of the MLL1 methyltransferase complex. Our study reveals a novel chromatin mechanism underlying the progression of tumours with GOF p53, and suggests new possibilities for designing combinatorial chromatin-based therapies for treating individual cancers driven by prevalent GOF p53 mutations.

| S-EPMC4568559 | biostudies-literature

Pyrimidine Triones as Potential Activators of p53 Mutants

Project description:p53 is a crucial tumor suppressor in vertebrates that is frequently mutated in human cancers. Most mutations are missense mutations that render p53 inactive in suppressing tumor initiation and progression. Developing small molecule drugs to convert mutant p53 into an active, wild-type-like conformation is a significant focus for personalized cancer therapy. Prior research indicates that reactivating p53 suppresses cancer cell proliferation and tumor growth in animal models. Early clinical evidence with a compound selectively targeting p53 mutants with substitutions of tyrosine 220 suggests potential therapeutic benefits of reactivating p53 in patients. This study identifies and examines the UCI-1001 compound series as a potential corrector for several p53 mutations. The findings indicate that UCI-1001 treatment in p53 mutant cancer cell lines inhibits growth and reinstates wild-type p53 activities, including DNA binding, target gene activation, and induction of cell death. Cellular thermal shift assays, conformation-specific immunofluorescence staining, and differential scanning fluorometry suggest that UCI-1001 interacts with and alters the conformation of mutant p53 in cancer cells. These initial results identify pyrimidine trione derivatives of the UCI-1001 series as candidates for p53 corrector drug development.

2024-08-05 | GSE273169 | GEO

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