Mitochondrial genome instability resulting from SUV3 haploinsufficiency leads to tumorigenesis and shortened lifespan.

Oncogene
P-L ChenW-H Lee

Abstract

Mitochondrial dysfunction has been a hallmark of cancer. However, whether it has a causative role awaits to be elucidated. Here, using an animal model derived from inactivation of SUV3, a mitochondrial helicase, we demonstrated that mSuv3+/- mice harbored increased mitochondrial DNA (mtDNA) mutations and decreased mtDNA copy numbers, leading to tumor development in various sites and shortened lifespan. These phenotypes were transmitted maternally, indicating the etiological role of the mitochondria. Importantly, reduced SUV3 expression was observed in human breast tumor specimens compared with corresponding normal tissues in two independent cohorts. These results demonstrated for the first time that maintaining mtDNA integrity by SUV3 helicase is critical for cancer suppression.

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Methods Mentioned

BETA
PCR
genotyping
transgenic

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