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Myocilin/MYOC  Protein, Antibody, ELISA Kit, cDNA Clone

Myocilin/MYOC Related Area

Myocilin/MYOC Related Pathways

Myocilin/MYOC Summary & Protein Information

Myocilin/MYOC Background

Gene Summary: MYOC encodes the protein myocilin, which is believed to have a role in cytoskeletal function. MYOC is expressed in many occular tissues, including the trabecular meshwork, and was revealed to be the trabecular meshwork glucocorticoid-inducible response protein (TIGR). The trabecular meshwork is a specialized eye tissue essential in regulating intraocular pressure, and mutations in MYOC have been identified as the cause of hereditary juvenile-onset open-angle glaucoma
General information above from NCBI
Subunit structure: Homodimer (via N-terminus). Interacts with OLFM3, FN1, NRCAM, GLDN and NFASC. Interacts (via N-terminus) with MYL2. Interacts with SFRP1, FRZB, FZD7, FZD10, FZD1 and WIF1; regulates Wnt signaling. Interacts with SNTA1; regulates muscle hypertrophy. Interacts with ERBB2 and ERBB3; acivates ERBB2-ERBB3 signaling pathway. Interacts with SNCG; affects its secretion and its aggegation. {ECO:0000269|PubMed:11773026, ECO:0000269|PubMed:11773029, ECO:0000269|PubMed:12019210, ECO:0000269|PubMed:19188438, ECO:0000269|PubMed:23897819}.
Subcellular location: Secreted. Golgi apparatus. Cytoplasmic vesicle. Secreted, extracellular space. Secreted, extracellular space, extracellular matrix. Secreted, exosome. Mitochondrion. Mitochondrion intermembrane space. Mitochondrion inner membrane. Mitochondrion outer membrane. Rough endoplasmic reticulum. Cell projection. Cell projection, cilium. Note=Located preferentially in the ciliary rootlet and basal body of the connecting cilium of photoreceptor cells, and in the rough endoplasmic reticulum. It is only imported to mitochondria in the trabecular meshwork. Localizes to the Golgi apparatus in Schlemm's canal endothelial cells. Appears in the extracellular space of trabecular meshwork cells by an unconventional mechanism, likely associated with exosome-like vesicles. Localizes in trabecular meshwork extracellular matrix.; Myocilin, C-terminal fragment: Secreted.; Myocilin, N-terminal fragment: Endoplasmic reticulum. Note=Remains retained in the endoplasmic reticulum.
Tissue specificity: Expressed in large amounts in various types of muscle, ciliary body, papillary sphincter, skeletal muscle, heart, bone marrow-derived mesenchymal stem cells and other tissues. Expressed predominantly in the retina. In normal eyes, found in the inner uveal meshwork region and the anterior portion of the meshwork. In contrast, in many glaucomatous eyes, it is found in more regions of the meshwork and appeared more intensively than in normal eyes, regardless of the type or clinical severity of glaucoma. The myocilin 35 kDa fragment is detected in aqueous humor and at the less extend in iris and ciliary body. {ECO:0000269|PubMed:15795224}.
Post-translational: Different isoforms may arise by post-translational modifications.; Glycosylated. {ECO:0000269|PubMed:17650508}.; Palmitoylated. {ECO:0000250}.; Undergoes a calcium-dependent proteolytic cleavage at Arg-226 by CAPN2 in the endoplasmic reticulum. The result is the production of two fragments, one of 35 kDa containing the C-terminal olfactomedin-like domain, and another of 20 kDa containing the N-terminal leucine zipper-like domain. {ECO:0000269|PubMed:15795224, ECO:0000269|PubMed:17650508}.
Involvement in disease: DISEASE: Glaucoma 1, open angle, A (GLC1A) [MIM:137750]: A form of primary open angle glaucoma (POAG). POAG is characterized by a specific pattern of optic nerve and visual field defects. The angle of the anterior chamber of the eye is open, and usually the intraocular pressure is increased. However, glaucoma can occur at any intraocular pressure. The disease is generally asymptomatic until the late stages, by which time significant and irreversible optic nerve damage has already taken place. {ECO:0000269|PubMed:10196380, ECO:0000269|PubMed:10330365, ECO:0000269|PubMed:10340788, ECO:0000269|PubMed:10644174, ECO:0000269|PubMed:10798654, ECO:0000269|PubMed:10819638, ECO:0000269|PubMed:10873982, ECO:0000269|PubMed:10916185, ECO:0000269|PubMed:10980537, ECO:0000269|PubMed:11004290, ECO:0000269|PubMed:11774072, ECO:0000269|PubMed:12189160, ECO:0000269|PubMed:12356829, ECO:0000269|PubMed:12362081, ECO:0000269|PubMed:12442283, ECO:0000269|PubMed:12860809, ECO:0000269|PubMed:12872267, ECO:0000269|PubMed:15025728, ECO:0000269|PubMed:15255110, ECO:0000269|PubMed:15534471, ECO:0000269|PubMed:16401791, ECO:0000269|PubMed:17210859, ECO:0000269|PubMed:17499207, ECO:0000269|PubMed:9005853, ECO:0000269|PubMed:9328473, ECO:0000269|PubMed:9345106, ECO:0000269|PubMed:9361308, ECO:0000269|PubMed:9490287, ECO:0000269|PubMed:9510647, ECO:0000269|PubMed:9521427, ECO:0000269|PubMed:9535666, ECO:0000269|PubMed:9697688, ECO:0000269|PubMed:9792882, ECO:0000269|PubMed:9863594}. Note=The disease is caused by mutations affecting the gene represented in this entry.; DISEASE: Glaucoma 3, primary congenital, A (GLC3A) [MIM:231300]: An autosomal recessive form of primary congenital glaucoma (PCG). PCG is characterized by marked increase of intraocular pressure at birth or early childhood, large ocular globes (buphthalmos) and corneal edema. It results from developmental defects of the trabecular meshwork and anterior chamber angle of the eye that prevent adequate drainage of aqueous humor. {ECO:0000269|PubMed:15733270}. Note=The disease is caused by mutations affecting distinct genetic loci, including the gene represented in this entry. MYOC mutations may contribute to GLC3A via digenic inheritance with CYP1B1 and/or another locus associated with the disease (PubMed:15733270). {ECO:0000269|PubMed:15733270}.
Sequence similarity: Contains 1 olfactomedin-like domain. {ECO:0000255|PROSITE-ProRule:PRU00446}.
General information above from UniProt

Myocilin, also known as Trabecular meshwork-induced glucocorticoid response protein, MYOC and GLC1A, is a protein which contains one olfactomedin-like domain. Myocilin / MYOC may participate in the obstruction of fluid outflow in the trabecular meshwork. Myocilin / MYOC is expressed in large amounts in various types of muscle, ciliary body, papillary sphincter, skeletal muscle, heart and other tissues. Myocilin / MYOC is expressed predominantly in the retina. In normal eyes, it is found in the inner uveal meshwork region and the anterior portion of the meshwork. In contrast, in many glaucomatous eyes, it is found in more regions of the meshwork and appeared more intensively than in normal eyes, regardless of the type or clinical severity of glaucoma. Defects in Myocilin / MYOC may contribute to primary congenital glaucoma type 3A (GLC3A). Defects in MYOC may also contribute to this phenotype via digenic inheritance. GLC3A is an autosomal recessive form of primary congenital glaucoma (PCG). PCG is characterized by marked increase of intraocular pressure at birth or early choldhood, large ocular globes (buphthalmos) and corneal edema.

Myocilin/MYOC Alternative Name

GPOA,JOAG,TIGR,GLC1A,JOAG1,myocilin, [homo-sapiens]
GLC1A,GPOA,JOAG,JOAG1,Myocilin,TIGR,MYOC, [human]
AI957332,GLC1A,MGC159032,Myocilin,Myoc,TIGR, [mouse]
TIGR,GLC1A,AI957332, [mus-musculus]

Myocilin/MYOC Related Studies

  • Kubota R., et al., 1997, Genomics 41:360-369.
  • Kubota R., et al., 1998, Biochem. Biophys. Res. Commun. 242:396-400.
  • Ishikawa K., et al., 2004, J. Glaucoma 13:466-471.
  • Bayat,B. et al., 2008, Mol Vis.14 :508-17.
  • Tanwar,M. et al., 2010,  Mol Vis. 16 :1996-2006.
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