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- W4383532727 abstract "Abstract The pseudokinase Tribbles Homolog 1 ( TRIB1 ) is a known driver of tumorigenesis in acute myeloid leukemia and is encoded upstream of the oncogene MYC at the 8q24 locus. We observed that TRIB1/MYC co-amplification is associated with decreased relapse-free and overall survival in breast cancer patients, but the role of TRIB1 in this disease has not been well characterized. TRIB1 knockdown in multiple breast cancer cell lines inhibited cell proliferation and suppressed MYC expression, implicating TRIB1 in breast cancer cell proliferation. Transcriptomic and cell cycle analysis revealed cell cycle regulation as the likely mechanism through which TRIB1 influences breast cancer cell proliferation. TRIB1 knockdown also resulted in significant changes in both estrogen receptor (ER) and β-catenin associated transcription. Interrogating the TRIB1 interactome in breast cancer cells by qPLEX-RIME reinforced the known association between TRIB1 and ubiquitination, while revealing a range of previously undescribed TRIB1 associated factors. Further analysis of the association between TRIB1, β-catenin and FERMT2 suggests TRIB1 may regulate β-catenin activity by controlling the levels of both β-catenin, and its co-factor FERMT2. Together, these results suggest that coregulation of β-catenin and ER-driven transcription by TRIB1, facilitates regulation of MYC expression and breast cancer cell proliferation. Significance The pseudokinase TRIB1 is frequently co-amplified in breast cancers with the potent oncogene MYC , although the functional consequences of this event are not well understood. This study demonstrates TRIB1 is a regulator of cell cycle progression and MYC expression in breast cancer cells. It also profiles TRIB1 -associated proteins in breast cancer cells, demonstrating conservation of TRIB1’s canonical interaction with COP1 and reveals associations with members of the wider ubiquitination machinery, a range of transcriptional regulators and chromatin remodelers. The data presented provide insight into the function of TRIB1 in breast cancer and the role of TRIB1 in transcriptional regulation." @default.
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- W4383532727 date "2023-07-07" @default.
- W4383532727 modified "2023-09-26" @default.
- W4383532727 title "TRIB1 modulates transcriptional programming in breast cancer cells to regulate cell proliferation" @default.
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- W4383532727 doi "https://doi.org/10.1101/2023.07.06.547928" @default.
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