Aliases for OPN4 Gene
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 Nonarteritic Anterior Ischemic Optic Neuropathy. Among its related pathways are Peptide ligand-binding receptors and Signaling by GPCR. 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 RRH.
UniProtKB/Swiss-Prot Summary for OPN4 Gene
Photoreceptor that binds cis-retinaldehydes (PubMed:15674244). Contributes to pupillar reflex, photoentrainment and other non-image forming responses to light (By similarity). May be involved in the optokinetic visual tracking response (By similarity). May be involved in the regulation of retinal hyaloid vessel growth and regression (By similarity).