[Histone deacetylase and retinoblastoma protein].

The balance between cellular proliferation and differentiation is strictly controlled in the cell and the deregulation of this balance can lead to tumour formation. The tumour suppressor protein Rb plays a key role in this balance essentially by repressing progression through the cell cycle and thereby it blocks the cell in G1 phase. Rb represses S phase genes through the recruitment of an enzyme which modifies DNA structure, the histone deacetylase HDAC1. The Rb/HDAC1 complex is a key element in the control of cell proliferation and differentiation. Moreover, this complex is likely to be a target for transforming viral proteins.