Abstract: The present invention relates to the identification, isolation, sequencing and characterization of a new member of the histone deacetylase family, as well as its transcripts, gene products, associated sequence information, and related genes. The present invention also relates to methods for detecting and diagnosing carriers of normal and mutant alleles of these genes, methods for detecting and diagnosing diseases, methods of identifying genes and proteins related to or interacting with such genes and proteins, methods of screening for potential therapeutics for diseases, methods of treatment for diseases, and to cell lines and animal models useful in screening for and evaluating potentially useful therapies for diseases. In a particular aspect of the present invention, a novel family member, HDAC7, is described and its interaction with SMRT/N-CoR and mSin3A, its biochemical properties and subcellular localization are characterized.