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ACTG1
Available structures PDB Ortholog search: PDBe RCSB List of PDB id codes 5JLH
Identifiers
Aliases	ACTG1, ACT, ACTG, BRWS2, DFNA20, DFNA26, HEL-176, actin gamma 1
External IDs	OMIM: 102560; MGI: 87906; HomoloGene: 74402; GeneCards: ACTG1; OMA:ACTG1 - orthologs
Gene location (Human) Chr. Chromosome 17 (human) Band 17q25.3 Start 81,509,413 bp End 81,523,847 bp
Gene location (Mouse) Chr. Chromosome 11 (mouse) Band 11|11 E2 Start 120,236,516 bp End 120,239,368 bp
RNA expression pattern Bgee Human Mouse (ortholog) Top expressed in mucosa of ileum ventricular zone amniotic fluid embryo ganglionic eminence parietal pleura epithelium of nasopharynx visceral pleura spinal ganglia pericardium Top expressed in granulocyte ganglionic eminence neural tube Mesencephalon dentate gyrus of hippocampal formation granule cell placenta primary visual cortex epiblast blastocyst stomach More reference expression data BioGPS More reference expression data
Gene ontology Molecular function nucleotide binding protein binding ATP binding ubiquitin protein ligase binding identical protein binding structural constituent of cytoskeleton profilin binding Cellular component focal adhesion nucleus dense body cytoplasm membrane cytosol extracellular exosome blood microparticle plasma membrane cytoskeleton extracellular matrix extracellular space actin cytoskeleton myofibril filamentous actin myelin sheath actin filament Biological process cell junction assembly ephrin receptor signaling pathway platelet aggregation Fc-gamma receptor signaling pathway involved in phagocytosis retina homeostasis vascular endothelial growth factor receptor signaling pathway membrane organization sarcomere organization Sources:Amigo / QuickGO
Orthologs Species Human Mouse Entrez 71 11465 Ensembl ENSG00000184009 ENSMUSG00000062825 UniProt P63261 P63260 RefSeq (mRNA) NM_001199954 NM_001614 NM_009609 NM_001313923 RefSeq (protein) NP_001186883 NP_001605 NP_001300852 NP_033739 Location (UCSC) Chr 17: 81.51 – 81.52 Mb Chr 11: 120.24 – 120.24 Mb PubMed search
Wikidata
View/Edit Human View/Edit Mouse

Actin, cytoplasmic 2, or gamma-actin is a protein that in humans is encoded by the ACTG1 gene. Gamma-actin is widely expressed in cellular cytoskeletons of many tissues; in adult striated muscle cells, gamma-actin is localized to Z-discs and costamere structures, which are responsible for force transduction and transmission in muscle cells. Mutations in ACTG1 have been associated with nonsyndromic hearing loss and Baraitser-Winter syndrome, as well as susceptibility of adolescent patients to vincristine toxicity.

Structure

Human gamma-actin is 41.8 kDa in molecular weight and 375 amino acids in length. Actins are highly conserved proteins that are involved in various types of cell motility, and maintenance of the cytoskeleton. In vertebrates, three main groups of actin paralogs, alpha, beta, and gamma, have been identified.

The alpha actins are found in muscle tissues and are a major constituent of the sarcomere contractile apparatus. The beta and gamma actins co-exist in most cell types as components of the cytoskeleton, and as mediators of internal cell motility. Actin, gamma 1, encoded by this gene, is found in non-muscle cells in the cytoplasm, and in muscle cells at costamere structures, or transverse points of cell-cell adhesion that run perpendicular to the long axis of myocytes.

Function

In myocytes, sarcomeres adhere to the sarcolemma via costameres, which align at Z-discs and M-lines. The two primary cytoskeletal components of costameres are desmin intermediate filaments and gamma-actin microfilaments. It has been shown that gamma-actin interacting with another costameric protein dystrophin is critical for costameres forming mechanically strong links between the cytoskeleton and the sarcolemmal membrane. Additional studies have shown that gamma-actin colocalizes with alpha-actinin and GFP-labeled gamma actin localized to Z-discs, whereas GFP-alpha-actin localized to pointed ends of thin filaments, indicating that gamma actin specifically localizes to Z-discs in striated muscle cells.

During development of myocytes, gamma actin is thought to play a role in the organization and assembly of developing sarcomeres, evidenced in part by its early colocalization with alpha-actinin. Gamma-actin is eventually replaced by sarcomeric alpha-actin isoforms, with low levels of gamma-actin persisting in adult myocytes which associate with Z-disc and costamere domains.

Insights into the function of gamma-actin in muscle have come from studies employing transgenesis. In a skeletal muscle-specific knockout of gamma-actin in mice, these animals showed no detectable abnormalities in development; however, knockout mice showed muscle weakness and fiber necrosis, along with decreased isometric twitch force, disrupted intrafibrillar and interfibrillar connections among myocytes, and myopathy.

Clinical significance

An autosomal dominant mutation in ACTG1 in the DFNA20/26 locus at 17q25-qter was identified in patients with hearing loss. A Thr278Ile mutation was identified in helix 9 of gamma-actin protein, which is predicted to alter protein structure. This study identified the first disease causing mutation in gamma-actin and underlies the importance of gamma-actin as structural elements of the inner ear hair cells. Since then, other ACTG1 mutations have been linked to nonsyndromic hearing loss, including Met305Thr.

A missense mutation in ACTG1 at Ser155Phe has also been identified in patients with Baraitser-Winter syndrome, which is a developmental disorder characterized by congenital ptosis, excessively-arched eyebrows, hypertelorism, ocular colobomata, lissencephaly, short stature, seizures and hearing loss.

Differential expression of ACTG1 mRNA was also identified in patients with Sporadic Amyotrophic Lateral Sclerosis, a devastating disease with unknown causality, using a sophisticated bioinformatics approach employing Affymetrix long-oligonucleotide BaFL methods.

Single nucleotide polymorphisms in ACTG1 have been associated with vincristine toxicity, which is part of the standard treatment regimen for childhood acute lymphoblastic leukemia. Neurotoxicity was more frequent in patients that were ACTG1 Gly310Ala mutation carriers, suggesting that this may play a role in patient outcomes from vincristine treatment.

Interactions

ACTG1 has been shown to interact with:

• CAP1,
• DMD,
• TMSB4X, and
• Plectin.

See also

• Actin

References

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2. ^ GRCm38: Ensembl release 89: ENSMUSG00000062825 – Ensembl, May 2017
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18. Lloyd CM, Berendse M, Lloyd DG, Schevzov G, Grounds MD (Jul 2004). "A novel role for non-muscle gamma-actin in skeletal muscle sarcomere assembly". Experimental Cell Research. 297 (1): 82–96. doi:10.1016/j.yexcr.2004.02.012. PMID 15194427.
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20. Shani M, Zevin-Sonkin D, Saxel O, Carmon Y, Katcoff D, Nudel U, Yaffe D (Sep 1981). "The correlation between the synthesis of skeletal muscle actin, myosin heavy chain, and myosin light chain and the accumulation of corresponding mRNA sequences during myogenesis". Developmental Biology. 86 (2): 483–92. doi:10.1016/0012-1606(81)90206-2. PMID 7286410.
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22. Hanft LM, Bogan DJ, Mayer U, Kaufman SJ, Kornegay JN, Ervasti JM (Jul 2007). "Cytoplasmic gamma-actin expression in diverse animal models of muscular dystrophy". Neuromuscular Disorders. 17 (7): 569–74. doi:10.1016/j.nmd.2007.03.004. PMC 1993539. PMID 17475492.
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27. Rivière JB, van Bon BW, Hoischen A, Kholmanskikh SS, O'Roak BJ, Gilissen C, Gijsen S, Sullivan CT, Christian SL, Abdul-Rahman OA, Atkin JF, Chassaing N, Drouin-Garraud V, Fry AE, Fryns JP, Gripp KW, Kempers M, Kleefstra T, Mancini GM, Nowaczyk MJ, van Ravenswaaij-Arts CM, Roscioli T, Marble M, Rosenfeld JA, Siu VM, de Vries BB, Shendure J, Verloes A, Veltman JA, Brunner HG, Ross ME, Pilz DT, Dobyns WB (Apr 2012). "De novo mutations in the actin genes ACTB and ACTG1 cause Baraitser-Winter syndrome". Nature Genetics. 44 (4): 440–4, S1–2. doi:10.1038/ng.1091. PMC 3677859. PMID 22366783.
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31. Hubberstey A, Yu G, Loewith R, Lakusta C, Young D (Jun 1996). "Mammalian CAP interacts with CAP, CAP2, and actin". Journal of Cellular Biochemistry. 61 (3): 459–66. doi:10.1002/(SICI)1097-4644(19960601)61:3<459::AID-JCB13>3.0.CO;2-E. PMID 8761950. S2CID 46076387.
32. Hertzog M, van Heijenoort C, Didry D, Gaudier M, Coutant J, Gigant B, Didelot G, Préat T, Knossow M, Guittet E, Carlier MF (May 2004). "The beta-thymosin/WH2 domain; structural basis for the switch from inhibition to promotion of actin assembly". Cell. 117 (5): 611–23. doi:10.1016/S0092-8674(04)00403-9. PMID 15163409. S2CID 8628287.
33. Van Troys M, Dewitte D, Goethals M, Carlier MF, Vandekerckhove J, Ampe C (Jan 1996). "The actin binding site of thymosin beta 4 mapped by mutational analysis". The EMBO Journal. 15 (2): 201–10. doi:10.1002/j.1460-2075.1996.tb00350.x. PMC 449934. PMID 8617195.
34. Hijikata T, Nakamura A, Isokawa K, Imamura M, Yuasa K, Ishikawa R, Kohama K, Takeda S, Yorifuji H (Jun 2008). "Plectin 1 links intermediate filaments to costameric sarcolemma through beta-synemin, alpha-dystrobrevin and actin". Journal of Cell Science. 121 (Pt 12): 2062–74. doi:10.1242/jcs.021634. PMID 18505798. S2CID 207164281.

External links

• Human ACTG1 genome location and ACTG1 gene details page in the UCSC Genome Browser.

Further reading

• Snásel J, Pichová I (1997). "The cleavage of host cell proteins by HIV-1 protease". Folia Biologica. 42 (5): 227–30. doi:10.1007/BF02818986. PMID 8997639. S2CID 7617882.
• Rodríguez Del Castillo A, Vitale ML, Trifaró JM (Nov 1992). "Ca2+ and pH determine the interaction of chromaffin cell scinderin with phosphatidylserine and phosphatidylinositol 4,5,-biphosphate and its cellular distribution during nicotinic-receptor stimulation and protein kinase C activation". The Journal of Cell Biology. 119 (4): 797–810. doi:10.1083/jcb.119.4.797. PMC 2289683. PMID 1331119.
• Adams LD, Tomasselli AG, Robbins P, Moss B, Heinrikson RL (Feb 1992). "HIV-1 protease cleaves actin during acute infection of human T-lymphocytes". AIDS Research and Human Retroviruses. 8 (2): 291–5. doi:10.1089/aid.1992.8.291. PMID 1540415.
• Dawson SJ, White LA (May 1992). "Treatment of Haemophilus aphrophilus endocarditis with ciprofloxacin". The Journal of Infection. 24 (3): 317–20. doi:10.1016/S0163-4453(05)80037-4. PMID 1602151.
• Tomasselli AG, Hui JO, Adams L, Chosay J, Lowery D, Greenberg B, Yem A, Deibel MR, Zürcher-Neely H, Heinrikson RL (Aug 1991). "Actin, troponin C, Alzheimer amyloid precursor protein and pro-interleukin 1 beta as substrates of the protease from human immunodeficiency virus". The Journal of Biological Chemistry. 266 (22): 14548–53. doi:10.1016/S0021-9258(18)98721-1. PMID 1907279.
• Shoeman RL, Kesselmier C, Mothes E, Höner B, Traub P (Jan 1991). "Non-viral cellular substrates for human immunodeficiency virus type 1 protease". FEBS Letters. 278 (2): 199–203. doi:10.1016/0014-5793(91)80116-K. PMID 1991513. S2CID 37002682.
• Erba HP, Eddy R, Shows T, Kedes L, Gunning P (Apr 1988). "Structure, chromosome location, and expression of the human gamma-actin gene: differential evolution, location, and expression of the cytoskeletal beta- and gamma-actin genes". Molecular and Cellular Biology. 8 (4): 1775–89. doi:10.1128/mcb.8.4.1775. PMC 363338. PMID 2837653.
• Vandekerckhove J, Schering B, Bärmann M, Aktories K (Jan 1988). "Botulinum C2 toxin ADP-ribosylates cytoplasmic beta/gamma-actin in arginine 177". The Journal of Biological Chemistry. 263 (2): 696–700. doi:10.1016/S0021-9258(19)35408-0. PMID 3335520.
• Chou CC, Davis RC, Fuller ML, Slovin JP, Wong A, Wright J, Kania S, Shaked R, Gatti RA, Salser WA (May 1987). "Gamma-actin: unusual mRNA 3'-untranslated sequence conservation and amino acid substitutions that may be cancer related". Proceedings of the National Academy of Sciences of the United States of America. 84 (9): 2575–9. Bibcode:1987PNAS...84.2575C. doi:10.1073/pnas.84.9.2575. PMC 304700. PMID 3472224.
• Hesterberg LK, Weber K (Jan 1986). "Isolation of a domain of villin retaining calcium-dependent interaction with G-actin, but devoid of F-actin fragmenting activity". European Journal of Biochemistry. 154 (1): 135–40. doi:10.1111/j.1432-1033.1986.tb09368.x. PMID 3510866.
• Erba HP, Gunning P, Kedes L (Jul 1986). "Nucleotide sequence of the human gamma cytoskeletal actin mRNA: anomalous evolution of vertebrate non-muscle actin genes". Nucleic Acids Research. 14 (13): 5275–94. doi:10.1093/nar/14.13.5275. PMC 311540. PMID 3737401.
• Fuchs E, Kim KH, Hanukoglu I, Tanese N (1984). "The evolution and complexity of the genes encoding the cytoskeletal proteins of human epidermal cells". Current Problems in Dermatology. 11: 27–44. doi:10.1159/000408662. ISBN 978-3-8055-3752-0. PMID 6686106.
• Gunning P, Ponte P, Okayama H, Engel J, Blau H, Kedes L (May 1983). "Isolation and characterization of full-length cDNA clones for human alpha-, beta-, and gamma-actin mRNAs: skeletal but not cytoplasmic actins have an amino-terminal cysteine that is subsequently removed". Molecular and Cellular Biology. 3 (5): 787–95. doi:10.1128/mcb.3.5.787. PMC 368601. PMID 6865942.
• Bretscher A, Weber K (Jul 1980). "Villin is a major protein of the microvillus cytoskeleton which binds both G and F actin in a calcium-dependent manner". Cell. 20 (3): 839–47. doi:10.1016/0092-8674(80)90330-X. PMID 6893424. S2CID 568395.
• Pedrotti B, Colombo R, Islam K (1995). "Microtubule associated protein MAP1A is an actin-binding and crosslinking protein". Cell Motility and the Cytoskeleton. 29 (2): 110–6. doi:10.1002/cm.970290203. PMID 7820861.
• Pope B, Maciver S, Weeds A (Feb 1995). "Localization of the calcium-sensitive actin monomer binding site in gelsolin to segment 4 and identification of calcium binding sites". Biochemistry. 34 (5): 1583–8. doi:10.1021/bi00005a014. PMID 7849017.
• Jesaitis AJ, Erickson RW, Klotz KN, Bommakanti RK, Siemsen DW (Nov 1993). "Functional molecular complexes of human N-formyl chemoattractant receptors and actin". Journal of Immunology. 151 (10): 5653–65. doi:10.4049/jimmunol.151.10.5653. PMID 8228254. S2CID 45748273.
• Hawkins M, Pope B, Maciver SK, Weeds AG (Sep 1993). "Human actin depolymerizing factor mediates a pH-sensitive destruction of actin filaments". Biochemistry. 32 (38): 9985–93. doi:10.1021/bi00089a014. PMID 8399167.
• Yu FX, Lin SC, Morrison-Bogorad M, Atkinson MA, Yin HL (Jan 1993). "Thymosin beta 10 and thymosin beta 4 are both actin monomer sequestering proteins". The Journal of Biological Chemistry. 268 (1): 502–9. doi:10.1016/S0021-9258(18)54179-X. PMID 8416954.
• Jalaguier S, Mornet D, Mesnier D, Léger JJ, Auzou G (Apr 1996). "Human mineralocorticoid receptor interacts with actin under mineralocorticoid ligand modulation". FEBS Letters. 384 (2): 112–6. doi:10.1016/0014-5793(96)00295-5. PMID 8612804. S2CID 34685894.

• Genes on human chromosome 17
• Proteins