The protein encoded by this gene is a ubiquitously expressed nuclear protein. It binds directly, with several other proteins, to retinoblastoma protein (pRB) which regulates cell proliferation. pRB represses transcription by recruiting the encoded protein. This protein, in turn, serves as a bridging molecule to recruit HDACs and, in addition, provides a second HDAC-independent repression function. The encoded protein possesses transcriptional repression activity. Multiple alternatively spliced transcripts have been observed for this gene, although not all transcript variants have been fully described.
Twenty five tests were carried out and nine phenotypes were reported. Fewer homozygousmutant embryos were identified during gestation than expected, and in a separate study less than the predicted Mendelian ratio survived until weaning. Homozygous mutant male adults has a reduced body weight curve and a decreased grip strength. Homozygous mutant adults of both sexes had a decreased body weight as determined by DEXA, displayed vertebral fusion and had clinical chemistry abnormalities including hypoalbuminemia and decreased circulating fructosamine levels. They also had haematological defects and an increased NK cell number.
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