pRB, or retinoblastoma protein, is a crucial tumor suppressor that plays a significant role in regulating the cell cycle. It is encoded by the RB1 gene, and its primary function is to control the progression of cells from the G1 phase to the S phase of the cell cycle. When functioning properly, pRB binds to and inhibits E2F transcription factors, which are necessary for the expression of genes required for DNA synthesis and cell division.
pRB is often found to be downregulated or functionally inactivated due to mutations in the RB1 gene or through other mechanisms.
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