The SMARCs (SWI/SNF-related, matrix-associated, actin-dependent regulators of chromatin), and BAFs (BRG1-associated factors), have been identified as components of the mammalian SWI/SNF-like chromatin-remodeling protein complexes. These multi-protein complexes are proposed to function as ATP-driven motors that translocate along DNA and destabilize nucleosomal structures to facilitate transcription factor binding. SMARCAD1/ETL1 is a unique member of this family in that it contains two DEAD/H box motifs, and thus is also a member of the DEAD/H-box-containing helicase superfamily. The chromosomal position of SMARCAD1 has been mapped, and it resides in a region rich in breakpoints and deletions associated with several human diseases. It is suggested to play a role in genetic instability and development.