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POU2F3 is a master regulator of a tuft cell-like variant of small cell lung cancer

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

ORGANISM(S): Homo sapiens

PROVIDER: GSE115124 | GEO | 2018/06/22

REPOSITORIES: GEO

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POU2F3 is a master regulator of a tuft cell-like variant of small cell lung cancer.

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Project description:The transcription factor POU2F3 defines the identity of tuft cells and underlies a distinct molecular subtype of small cell lung cancer (SCLC). Although POU2F3 is considered undruggable, its activity critically depends on the coactivators OCA-T1 and OCA-T2. Here, we demonstrate that acute suppression of either POU2F3 or OCA-T1 induces regression of tuft cell-like SCLC xenografts in vivo. To explore the structural basis and druggability of this dependency, we solved crystal structures of POU2F3 bound to OCA-T1 or OCA-T2 in complex with DNA, revealing a tripartite, DNA-dependent interface. We further employed deep mutational scanning to systematically assess the functional impact of 4,218 missense variants in POU2F3 and OCA-T1, uncovering both mutation-sensitive hotspots and structurally constrained regions critical for tumor cell fitness. These findings define a unique transcriptional complex that integrates DNA recognition with coactivator recruitment and nominate POU2F3–OCA-T as a structurally tractable vulnerability in tuft cell-like carcinomas.

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