Rev-ErbA alpha also known as NR1D1 (nuclear receptor subfamily 1, group D, member 1), is a protein that in humans is encoded by the NR1D1 gene.
Rev-erbα is member of the Rev-ErbA family of nuclear receptors and is a transcriptional repressor. In mammals, Rev-erbα is highly expressed in the liver, skeletal muscle, adipose tissue, and the brain, participating in the development and circadian regulation of these tissues.