Conjunction dysfunction: CBP/p300 in human disease.

CBP and its homolog p300 are large nuclear molecules that coordinate a variety of transcriptional pathways with chromatin remodeling. They interact with transcriptional activators as well as repressors, direct chromatin-mediated transcription, function in TP53-mediated apoptosis, and participate in terminal differentiation of certain tissue types. Recent evidence suggests that the demand for CBP/p300 is greater than the supply, and that competition for CBP/p300 might play an important role in cell growth regulation. Alterations of the human CBP gene have been implicated in hematological malignancies as well as in congenital malformation and mental retardation. Likewise, the p300 gene has been recently implicated in leukemia and mutations in both alleles have been observed in gastric and colorectal carcinomas. The role of these proteins in human disease coupled with biochemical evidence suggests that CBP and p300 are tumor suppressor proteins essential in cell-cycle control, cellular differentiation and human development.

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