A family of transcription factors designated sterol regulatory element-binding proteins (SREBPs) mediates the previously described end-product feedback regulation of cholesterol biosynthesis. In addition, SREBPs are emerging as important regulators of fatty acid synthesis. The current review focuses on the in-vivo regulation of SREBPs in liver and the coordinate regulation of SREBP-activated target genes. Curr Opin Lipidol 10:143-150, (C) 1999 Lippincott Williams & Wilkins.