External Ids for OPN4 Gene
Previous GeneCards Identifiers for OPN4 Gene
Opsins are members of the guanine nucleotide-binding protein (G protein)-coupled receptor superfamily. This gene encodes a photoreceptive opsin protein that is expressed within the ganglion and amacrine cell layers of the retina. In mouse, retinal ganglion cell axons expressing this gene projected to the suprachiasmatic nucleus and other brain nuclei involved in circadian photoentrainment. In mouse, this protein is coupled to a transient receptor potential (TRP) ion channel through a G protein signaling pathway and produces a physiologic light response via membrane depolarization and increased intracellular calcium. The protein functions as a sensory photopigment and may also have photoisomerase activity. Experiments with knockout mice indicate that this gene attenuates, but does not abolish, photoentrainment. Alternative splicing results in multiple transcript variants encoding different isoforms. [provided by RefSeq, Jul 2008]
GeneCards Summary for OPN4 Gene
OPN4 (Opsin 4) is a Protein Coding gene. Diseases associated with OPN4 include Retinal Degeneration and Tritanopia. Among its related pathways are Signaling by GPCR and Circadian rythm related genes. Gene Ontology (GO) annotations related to this gene include G protein-coupled receptor activity and G protein-coupled photoreceptor activity. An important paralog of this gene is OPN5.
UniProtKB/Swiss-Prot Summary for OPN4 Gene
Photoreceptor required for regulation of circadian rhythm. Contributes to pupillar reflex and other non-image forming responses to light. May be able to isomerize covalently bound all-trans retinal back to 11-cis retinal (By similarity).