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The tumor suppressor BRCA1 plays an important role in the homologous recombination (HR) pathwayof DNA double strand break (DSB) repair. From a mechanistic perspective, BRCA1 facilitates recruitment ofnucleases required for end resection, the commitment step in HR repair, yet paradoxically, BRCA1 has beenshown to inhibit the nuclease activity in vitro. It is unclear how nuclease-recruiting and -inhibiting activities ofBRCA1 can be reconciled in HR repair.

UT Health San Antonio
Hu, Yanfen

The mTORC1 pathway regulates multiple cellular processes to promote a switch from catabolic toanabolic metabolism and is thus under tight regulatory control by growth factor signaling and nutrientsensing pathways. Dysregulation of this complex machinery is implicated in many cancers, so definingthe key mechanisms by which mTORC1 senses changes in cellular homeostasis to activate growthsignals is of great relevance. Spatial regulation of mTORC1 signaling has been recognized as a majormechanism that influences the cellular response to nutrients and the lysosome is central to thisprocess.

UT Health San Antonio
Dahia, Patricia L