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- W4361241768 abstract "<div>Abstract<p>The mitochondrial transcription factor A (TFAM) is required for mitochondrial DNA (mtDNA) replication and transcription. Disruption of TFAM results in heart failure and premature aging in mice. But very little is known about the role of TFAM in cancer development. Here, we report the identification of frequent frameshift mutations in the coding mononucleotide repeat of <i>TFAM</i> in sporadic colorectal cancer (CRC) cell lines and in primary tumors with microsatellite instability (MSI), but not in microsatellite stable (MSS) CRC cell lines and tumors. The presence of the <i>TFAM</i> truncating mutation, in CRC cells with MSI, reduced the TFAM protein level <i>in vivo</i> and <i>in vitro</i> and correlated with mtDNA depletion. Furthermore, forced overexpression of wild-type TFAM in RKO cells carrying a <i>TFAM</i> truncating mutation suppressed cell proliferation and inhibited RKO cell-induced xenograft tumor growth. Moreover, these cells showed more susceptibility to cisplatin-induced apoptosis due to an increase of cytochrome <i>b</i> (Cyt <i>b</i>) expression and its release from mitochondria. An interaction assay between TFAM and the heavy-strand promoter (HSP) of mitochondria revealed that mutant TFAM exhibited reduced binding to HSP, leading to reduction in Cyt <i>b</i> transcription. Collectively, these data provide evidence that a high incidence of <i>TFAM</i> truncating mutations leads to mitochondrial copy number reduction and mitochondrial instability, distinguishing most CRC with MSI from MSS CRC. These mutations may play an important role in tumorigenesis and cisplatin-induced apoptotic resistance of most microsatellite-unstable CRCs. <i>Cancer Res; 71(8); 2978–87. ©2011 AACR</i>.</p></div>" @default.
- W4361241768 created "2023-03-31" @default.
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- W4361241768 date "2023-03-30" @default.
- W4361241768 modified "2023-09-29" @default.
- W4361241768 title "Data from Frequent Truncating Mutation of <i>TFAM</i> Induces Mitochondrial DNA Depletion and Apoptotic Resistance in Microsatellite-Unstable Colorectal Cancer" @default.
- W4361241768 doi "https://doi.org/10.1158/0008-5472.c.6502751" @default.
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