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Cell ; 187(9): 2269-2287.e16, 2024 Apr 25.
Artigo em Inglês | MEDLINE | ID: mdl-38608703

RESUMO

Knudson's "two-hit" paradigm posits that carcinogenesis requires inactivation of both copies of an autosomal tumor suppressor gene. Here, we report that the glycolytic metabolite methylglyoxal (MGO) transiently bypasses Knudson's paradigm by inactivating the breast cancer suppressor protein BRCA2 to elicit a cancer-associated, mutational single-base substitution (SBS) signature in nonmalignant mammary cells or patient-derived organoids. Germline monoallelic BRCA2 mutations predispose to these changes. An analogous SBS signature, again without biallelic BRCA2 inactivation, accompanies MGO accumulation and DNA damage in Kras-driven, Brca2-mutant murine pancreatic cancers and human breast cancers. MGO triggers BRCA2 proteolysis, temporarily disabling BRCA2's tumor suppressive functions in DNA repair and replication, causing functional haploinsufficiency. Intermittent MGO exposure incites episodic SBS mutations without permanent BRCA2 inactivation. Thus, a metabolic mechanism wherein MGO-induced BRCA2 haploinsufficiency transiently bypasses Knudson's two-hit requirement could link glycolysis activation by oncogenes, metabolic disorders, or dietary challenges to mutational signatures implicated in cancer evolution.


Assuntos
Proteína BRCA2 , Neoplasias da Mama , Glicólise , Aldeído Pirúvico , Animais , Proteína BRCA2/metabolismo , Proteína BRCA2/genética , Camundongos , Humanos , Feminino , Aldeído Pirúvico/metabolismo , Neoplasias da Mama/genética , Neoplasias da Mama/metabolismo , Haploinsuficiência , Neoplasias Pancreáticas/metabolismo , Neoplasias Pancreáticas/genética , Neoplasias Pancreáticas/patologia , Mutação , Dano ao DNA , Reparo do DNA , Linhagem Celular Tumoral
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