Dynamin-like 120 kDa protein

OPA1
Identifiers
Aliases	OPA1, MGM1, NPG, NTG, largeG, Optic atrophy 1, BERHS, MTDPS14, mitochondrial dynamin like GTPase, OPA1 mitochondrial dynamin like GTPase
External IDs	OMIM: 605290; MGI: 1921393; HomoloGene: 14618; GeneCards: OPA1; OMA:OPA1 - orthologs
Gene location (Human) Chr. Chromosome 3 (human) Band 3q29 Start 193,593,144 bp End 193,697,811 bp
Gene location (Mouse) Chr. Chromosome 16 (mouse) Band 16 B2|16 20.65 cM Start 29,398,152 bp End 29,473,702 bp
RNA expression pattern Bgee Human Mouse (ortholog) Top expressed in Achilles tendon endothelial cell secondary oocyte lateral nuclear group of thalamus Brodmann area 23 middle temporal gyrus right ventricle monocyte rectum superior frontal gyrus Top expressed in dorsal striatum olfactory tubercle nucleus accumbens pontine nuclei temporal lobe Region I of hippocampus proper subiculum medial vestibular nucleus myocardium of ventricle substantia nigra More reference expression data BioGPS More reference expression data
Gene ontology Molecular function nucleotide binding GTP binding protein binding hydrolase activity magnesium ion binding microtubule binding GTPase activity phosphatidic acid binding cardiolipin binding lipid binding kinase binding Cellular component integral component of membrane membrane mitochondrial intermembrane space nucleoplasm mitochondrial outer membrane extrinsic component of mitochondrial inner membrane dendrite mitochondrial crista mitochondrion axon cytoplasm mitochondrial inner membrane mitochondrial membranes cytosol cytoplasm Biological process mitochondrial fusion negative regulation of endoplasmic reticulum stress-induced intrinsic apoptotic signaling pathway inner mitochondrial membrane organization mitochondrial genome maintenance mitochondrial fission response to stimulus negative regulation of release of cytochrome c from mitochondria human ageing mitochondrion organization positive regulation of dendrite development cellular senescence axonal transport of mitochondrion positive regulation of mitochondrial fusion positive regulation of neuron maturation visual perception apoptotic process dynamin family protein polymerization involved in mitochondrial fission regulation of apoptotic process intracellular distribution of mitochondria positive regulation of dendritic spine morphogenesis mitochondrion morphogenesis response to muscle activity GTP metabolic process cellular response to glucose stimulus cellular response to hypoxia membrane tubulation response to electrical stimulus response to nutrient levels protein complex oligomerization calcium import into the mitochondrion retina development in camera-type eye cochlea development positive regulation of cellular response to insulin stimulus cellular response to L-glutamate negative regulation of apoptotic process positive regulation of insulin receptor signaling pathway membrane fusion response to curcumin Sources:Amigo / QuickGO
Orthologs Species Human Mouse Entrez 4976 74143 Ensembl ENSG00000198836 ENSMUSG00000038084 UniProt O60313 P58281 RefSeq (mRNA) NM_015560 NM_130831 NM_130832 NM_130833 NM_130834 NM_130835 NM_130836 NM_130837 NM_001354663 NM_001354664 NM_001199177 NM_133752 RefSeq (protein) NP_056375 NP_570844 NP_570845 NP_570846 NP_570847 NP_570848 NP_570849 NP_570850 NP_001341592 NP_001341593 NP_001186106 NP_598513 NP_001390099 NP_001390100 NP_001390101 NP_001390111 Location (UCSC) Chr 3: 193.59 – 193.7 Mb Chr 16: 29.4 – 29.47 Mb PubMed search
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Dynamin-like 120 kDa protein, mitochondrial is a protein that in humans is encoded by the OPA1 gene. This protein regulates mitochondrial fusion and cristae structure in the inner mitochondrial membrane (IMM) and contributes to ATP synthesis and apoptosis, and small, round mitochondria. Mutations in this gene have been implicated in dominant optic atrophy (DOA), leading to loss in vision, hearing, muscle contraction, and related dysfunctions.

Structure

Eight transcript variants encoding different isoforms, resulting from alternative splicing of exon 4 and two novel exons named 4b and 5b, have been reported for this gene. They fall under two types of isoforms: long isoforms (L-OPA1), which attach to the IMM, and short isoforms (S-OPA1), which localize to the intermembrane space (IMS) near the outer mitochondrial membrane (OMM). S-OPA1 is formed by proteolysis of L-OPA1 at the cleavage sites S1 and S2, removing the transmembrane domain.

Function

This gene product is a nuclear-encoded mitochondrial protein with similarity to dynamin-related GTPases. It is a component of the mitochondrial network. The OPA1 protein localizes to the inner mitochondrial membrane, where it regulates mitochondrial fusion and cristae structure. OPA1 mediates mitochondrial fusion in cooperation with mitofusins 1 and 2 and participates in cristae remodeling by the oligomerization of two L-OPA1 and one S-OPA1, which then interact with other protein complexes to alter cristae structure. Its cristae regulating function also contributes to its role in oxidative phosphorylation and apoptosis, as it is required to maintain mitochondrial activity during low-energy substrate availability. Moreover, stabilization of mitochondrial cristae by OPA1 protects against mitochondrial dysfunction, cytochrome c release, and reactive oxygen species production, thus preventing cell death. Mitochondrial SLC25A transporters can detect these low levels and stimulate OPA1 oligomerization, leading to tightening of the cristae, enhanced assembly of ATP synthase, and increased ATP production. Stress from an apoptotic response can interfere with OPA1 oligomerization and prevent mitochondrial fusion.

Clinical significance

Mutations in this gene have been associated with optic atrophy type 1, which is a dominantly inherited optic neuropathy resulting in progressive loss of visual acuity, leading in many cases to legal blindness. Dominant optic atrophy (DOA) in particular has been traced to mutations in the GTPase domain of OPA1, leading to sensorineural hearing loss, ataxia, sensorimotor neuropathy, progressive external ophthalmoplegia, and mitochondrial myopathy. As the mutations can lead to degeneration of auditory nerve fibres, cochlear implants provide a therapeutic means to improve hearing thresholds and speech perception in patients with OPA1-derived hearing loss.

Mitochondrial fusion involving OPA1 and MFN2 may be associated with Parkinson's disease.

Interactions

OPA1 has been shown to interact with:

• Adenonucleotide transporters,
• ATP synthase,
• CHCHD3,
• Mitofilin,
• Prohibitin,
• SAMM50, and
• SLC25A.

See also

• Kjer's optic neuropathy

Further reading

• Olichon A, Guillou E, Delettre C, Landes T, Arnauné-Pelloquin L, Emorine LJ, Mils V, Daloyau M, Hamel C, Amati-Bonneau P, Bonneau D, Reynier P, Lenaers G, Belenguer P (2006). "Mitochondrial dynamics and disease, OPA1". Biochimica et Biophysica Acta (BBA) - Molecular Cell Research. 1763 (5–6): 500–9. doi:10.1016/j.bbamcr.2006.04.003. PMID 16737747.
• Pawlikowska P, Orzechowski A (2007). "[Role of transmembrane GTPases in mitochondrial morphology and activity]". Postepy Biochemii. 53 (1): 53–9. PMID 17718388.
• Nagase T, Ishikawa K, Miyajima N, Tanaka A, Kotani H, Nomura N, Ohara O (Feb 1998). "Prediction of the coding sequences of unidentified human genes. IX. The complete sequences of 100 new cDNA clones from brain which can code for large proteins in vitro". DNA Research. 5 (1): 31–9. doi:10.1093/dnares/5.1.31. PMID 9628581.
• Johnston RL, Seller MJ, Behnam JT, Burdon MA, Spalton DJ (Jan 1999). "Dominant optic atrophy. Refining the clinical diagnostic criteria in light of genetic linkage studies". Ophthalmology. 106 (1): 123–8. doi:10.1016/S0161-6420(99)90013-1. PMID 9917792.
• Delettre C, Lenaers G, Griffoin JM, Gigarel N, Lorenzo C, Belenguer P, Pelloquin L, Grosgeorge J, Turc-Carel C, Perret E, Astarie-Dequeker C, Lasquellec L, Arnaud B, Ducommun B, Kaplan J, Hamel CP (Oct 2000). "Nuclear gene OPA1, encoding a mitochondrial dynamin-related protein, is mutated in dominant optic atrophy". Nature Genetics. 26 (2): 207–10. doi:10.1038/79936. PMID 11017079. S2CID 24514847.
• Alexander C, Votruba M, Pesch UE, Thiselton DL, Mayer S, Moore A, Rodriguez M, Kellner U, Leo-Kottler B, Auburger G, Bhattacharya SS, Wissinger B (Oct 2000). "OPA1, encoding a dynamin-related GTPase, is mutated in autosomal dominant optic atrophy linked to chromosome 3q28". Nature Genetics. 26 (2): 211–5. doi:10.1038/79944. PMID 11017080. S2CID 8314863.
• Toomes C, Marchbank NJ, Mackey DA, Craig JE, Newbury-Ecob RA, Bennett CP, Vize CJ, Desai SP, Black GC, Patel N, Teimory M, Markham AF, Inglehearn CF, Churchill AJ (Jun 2001). "Spectrum, frequency and penetrance of OPA1 mutations in dominant optic atrophy". Human Molecular Genetics. 10 (13): 1369–78. doi:10.1093/hmg/10.13.1369. PMID 11440989.
• Thiselton DL, Alexander C, Morris A, Brooks S, Rosenberg T, Eiberg H, Kjer B, Kjer P, Bhattacharya SS, Votruba M (Nov 2001). "A frameshift mutation in exon 28 of the OPA1 gene explains the high prevalence of dominant optic atrophy in the Danish population: evidence for a founder effect". Human Genetics. 109 (5): 498–502. doi:10.1007/s004390100600. PMID 11735024. S2CID 23854938.
• Delettre C, Griffoin JM, Kaplan J, Dollfus H, Lorenz B, Faivre L, Lenaers G, Belenguer P, Hamel CP (Dec 2001). "Mutation spectrum and splicing variants in the OPA1 gene". Human Genetics. 109 (6): 584–91. doi:10.1007/s00439-001-0633-y. PMID 11810270. S2CID 19099209.
• Aung T, Ocaka L, Ebenezer ND, Morris AG, Krawczak M, Thiselton DL, Alexander C, Votruba M, Brice G, Child AH, Francis PJ, Hitchings RA, Lehmann OJ, Bhattacharya SS (Jan 2002). "A major marker for normal tension glaucoma: association with polymorphisms in the OPA1 gene". Human Genetics. 110 (1): 52–6. doi:10.1007/s00439-001-0645-7. PMID 11810296. S2CID 20733038.
• Misaka T, Miyashita T, Kubo Y (May 2002). "Primary structure of a dynamin-related mouse mitochondrial GTPase and its distribution in brain, subcellular localization, and effect on mitochondrial morphology". The Journal of Biological Chemistry. 277 (18): 15834–42. doi:10.1074/jbc.M109260200. PMID 11847212.
• Thiselton DL, Alexander C, Taanman JW, Brooks S, Rosenberg T, Eiberg H, Andreasson S, Van Regemorter N, Munier FL, Moore AT, Bhattacharya SS, Votruba M (Jun 2002). "A comprehensive survey of mutations in the OPA1 gene in patients with autosomal dominant optic atrophy". Investigative Ophthalmology & Visual Science. 43 (6): 1715–24. PMID 12036970.
• Aung T, Ocaka L, Ebenezer ND, Morris AG, Brice G, Child AH, Hitchings RA, Lehmann OJ, Bhattacharya SS (May 2002). "Investigating the association between OPA1 polymorphisms and glaucoma: comparison between normal tension and high tension primary open angle glaucoma". Human Genetics. 110 (5): 513–4. doi:10.1007/s00439-002-0711-9. PMID 12073024. S2CID 13588421.
• Olichon A, Emorine LJ, Descoins E, Pelloquin L, Brichese L, Gas N, Guillou E, Delettre C, Valette A, Hamel CP, Ducommun B, Lenaers G, Belenguer P (Jul 2002). "The human dynamin-related protein OPA1 is anchored to the mitochondrial inner membrane facing the inter-membrane space". FEBS Letters. 523 (1–3): 171–6. doi:10.1016/S0014-5793(02)02985-X. PMID 12123827. S2CID 45592235.
• Marchbank NJ, Craig JE, Leek JP, Toohey M, Churchill AJ, Markham AF, Mackey DA, Toomes C, Inglehearn CF (Aug 2002). "Deletion of the OPA1 gene in a dominant optic atrophy family: evidence that haploinsufficiency is the cause of disease". Journal of Medical Genetics. 39 (8): 47e–47. doi:10.1136/jmg.39.8.e47. PMC 1735190. PMID 12161614.
• Satoh M, Hamamoto T, Seo N, Kagawa Y, Endo H (Jan 2003). "Differential sublocalization of the dynamin-related protein OPA1 isoforms in mitochondria". Biochemical and Biophysical Research Communications. 300 (2): 482–93. doi:10.1016/S0006-291X(02)02874-7. PMID 12504110.
• Olichon A, Baricault L, Gas N, Guillou E, Valette A, Belenguer P, Lenaers G (Mar 2003). "Loss of OPA1 perturbates the mitochondrial inner membrane structure and integrity, leading to cytochrome c release and apoptosis". The Journal of Biological Chemistry. 278 (10): 7743–6. doi:10.1074/jbc.C200677200. PMID 12509422.
• Shimizu S, Mori N, Kishi M, Sugata H, Tsuda A, Kubota N (Feb 2003). "A novel mutation in the OPA1 gene in a Japanese patient with optic atrophy". American Journal of Ophthalmology. 135 (2): 256–7. doi:10.1016/S0002-9394(02)01929-3. PMID 12566046.
• Alavi, MV; Fuhrmann, N. "Dominant optic atrophy, OPA1, and mitochondrial quality control: understanding mitochondrial network dynamics". Molecular Neurodegeneration. 8:32. doi:10.1186/1750-1326-8-32. PMID 24067127.{{cite journal}}: CS1 maint: unflagged free DOI (link)

External links

• GeneReview/NCBI/NIH/UW entry on Optic Atrophy Type 1
• association kjer-france