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Autophagic vacuolar myopathy

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206: 412:, the injection of the enzyme would alleviate the symptoms caused the disease. The functional enzyme is produced by genetically modified cells in the laboratory. It is then harvested, purified and eventually injected into the patient's body. With this enzyme, the body will be able to convert glycogen to glucose, providing the body with energy and thus alleviating the problem of energy deficiency in the muscles and heart. However, the 172:
the LAMP2 gene lead to little to no LAMP-2 protein production, impairing the transport of cellular materials into the lysosome. Without the LAMP-2 protein, fusion between autophagic vacuoles and lysosomes occurs much slower, leading to the accumulation of autophagic vacuoles. This accumulation leads to the breakdown of muscle cells, thereby causing the muscle weakness exhibited in Danon disease patients.
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humans, a mutation in that particular X chromosome could already cause the disease. Therefore, males typically exhibit more severe symptoms than females. Because Danon disease is X-linked, this means that fathers cannot pass their X-linked traits to their sons because males always pass their Y-chromosome to their male offsprings.
334:. However, it has been discovered that the use of muscle biopsies alone tends to result in false-negative results and subsequent delays in identifying and treating Pompe disease. Therefore, a combination of several tests is typically used in conjunction to confirm whether a patient has Pompe disease. 196:
pattern. Since females have two X-chromosomes, this means that females may be carriers who are asymptomatic or only showing mild symptoms. Meanwhile, males become diseased if they inherit just one X-chromosome that contains the mutated VMA21 gene. Similar to Danon disease, males with XMEA cannot pass
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and an enlarged heart, are typical to other conditions too. As such, a thorough and differential diagnosis by specialists can help to distinguish Pompe from other diseases with similar symptoms. Supposing the differential diagnosis concludes that Pompe disease is indeed present, further testing such
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characteristics and an excess of autophagic vacuoles. There are currently five types of AVM identified. The signs and symptoms become more severe over the course of the disease. It begins with an inability to pick up small objects and progresses to difficulty in walking. The age of onset varies from
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actually managed to cure the mice from Danon disease. This method could be a permanent solution since the gene would be able to generate the protein needed and normal functions of the protein would be restored. Nevertheless, this method has not yet been trialed on human subjects so it needs further
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and death, of which the severity depends on age of onset, organ involvement, and rate of progression. The onset of Pompe disease varies from infantile, late-infantile, childhood, juvenile, and adult-onset, though Pompe disease is broadly classified into just infant and late-onset. Specifically, for
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The causes of the disease is different mutation occurring in the aforementioned genes. For Danon disease which is related to LAMP2, since the LAMP2 gene is responsible for the production of the LAMP-2 protein, which plays a role in the transport of cellular materials into the lysosome, mutations of
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pattern. The LAMP2 gene associated with Danon disease is located on the X-chromosome. Since the X-chromosome is one of the two sex chromosomes, females may develop the disease with just one mutation in one of their two copies of the X-chromosome. Since there is only one X-chromosome present in
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to replace or add genes to the body so that the body can produce the required protein. ERT has been the main form of treatment though its effect is temporary. While gene therapy could be the ultimate cure, it is still under active research and more time is required before it can be applied to
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the mutated gene to their sons, but will pass the gene to their daughters, who will be carriers. Female carriers have a subsequent 25% chance of having a carrier daughter, a 25% chance to have a non-carrier daughter, a 25% chance to have a diseased son, and a 25% son to have a healthy son.
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would be affected. The symptoms are progressive. Patients might start off having difficulty in buttoning their clothes and picking up tiny objects. As it progresses to a more severe stage, they would have difficulty walking and rising up from the chair.
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A major limitation of ERT is that injections are needed routinely, meaning that ERT may not be a permanent cure since it can only improve the patient's muscle strength in the short term. Another constraint is that the enzyme is unable to cross the
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Kuperus E, Kruijshaar ME, Wens SC, de Vries JM, Favejee MM, van der Meijden JC, et al. (December 2017). "Long-term benefit of enzyme replacement therapy in Pompe disease: A 5-year prospective study".
483:. Gene therapy starts with the repairing or replacement of the gene that causes the disease. If this does not work, additional genes will be inserted into the body to address the mutated gene. 87:, leading to the accumulation of autophagic vacuoles. The result is the breakdown of muscle cells, which attributes to muscle weakness in patients with AVM. The mode of transmission is 1360:"Pulmonary function tests (maximum inspiratory pressure, maximum expiratory pressure, vital capacity, forced vital capacity) predict ventilator use in late-onset Pompe disease" 322:
features of Pompe disease. In other words, the overlapping signs and symptoms that Pompe disease shares with other neuromuscular diseases, such as muscle weakness and even
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are often consumed simultaneously to reduce the number of neutralising antibodies that could prevent the exogenous enzyme from exerting its effect.
1724: 1606: 1468: 859: 825: 99:. Other types of AVM are less researched in terms of their mode of transmission, but it is known that these diseases are all gene-related. 1211:
Dubrovsky A, Corderi J, Karasarides T, Taratuto AL (April 2013). "Pompe disease, the must-not-miss diagnosis: A report of 3 patients".
365:(EMG) to assess for the presence of muscle injury and dysfunction, are additional tests that are performed to diagnosis Pompe disease. 315:, symptoms, a physical exam, and laboratory tests. In addition, a diagnosis may also include a biopsy of the affected muscle tissue. 955: 405: 145: 1280:
Bhui R, Spector AR (April 2020). "Obstructive sleep apnea in late-onset Pompe disease treated by enzyme replacement therapy".
1647:"Systemic AAV9.LAMP2B injection reverses metabolic and physiologic multiorgan dysfunction in a murine model of Danon disease" 193: 96: 318:
For example, the diagnosis of Pompe disease presents a serious diagnostic dilemma as a result of the rarity and nonspecific
286: 185: 184:, meaning the gene with regards to AVM is located on a sex chromosome. Danon disease is hereditary and is inherited in an 92: 106:, alongside a thorough examination of the patient's history and symptoms. Treatment of the disease currently involves 1147: 265:, and skeletal myopathy. Men may also have varying degrees of intellectual disability with additional symptoms being 397: 374: 107: 296:
XMEA exhibits a similar set of symptoms as other AVMs, though the age of onset is predominantly during childhood.
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are better researched in terms of the gene causing the disorder. XMEA is linked to mutations in the VMA21 gene at
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Vissing J, Lukacs Z, Straub V (July 2013). "Diagnosis of Pompe disease: muscle biopsy vs blood-based assays".
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Patients with Pompe disease exhibit a similar set of symptoms, ranging from progressive debilitation, to
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Despite the clear clinical benefits, some side effects from ERT are exhibited. These included mild
358: 56: 20: 542:"Congenital autophagic vacuolar myopathy is allelic to X-linked myopathy with excessive autophagy" 1674: 1645:
Manso AM, Hashem SI, Nelson BC, Gault E, Soto-Hermida A, Villarruel E, et al. (March 2020).
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for genetic or rare diseases are often challenging. As such, diagnosis includes a combination of
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Weihl CC, Iyadurai S, Baloh RH, Pittman SK, Schmidt RE, Lopate G, et al. (March 2015).
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is caused by mutations of the VMA21 gene. These gene mutations slow down the fusion between
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Appleby CE, Kingston PA (June 2004). "Gene therapy for restenosis--what now, what next?".
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to show its validity. The same concept could be applied to other AVM, targeting different
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Bay LB, Denzler I, Durand C, Eiroa H, Frabasil J, Fainboim A, et al. (August 2019).
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Kishnani PS, Steiner RD, Bali D, Berger K, Byrne BJ, Case LE, et al. (May 2006).
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gene is unrelated to the two diseases, though the specific genes related are unknown.
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respectively. For infantile AVM and adult onset AVM with multiorgan involvement, the
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Comparison of a normal heart (left) and a heart with dilated cardiomyopathy (right)
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is a possibility for the future, a solution which may cure the disease completely.
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Johnson EM, Roberts M, Mozaffar T, Young P, Quartel A, Berger KI (February 2016).
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Strehle EM (August 2009). "Food for thought: autophagic vacuolar myopathies".
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gene have shown that the injection of the normal human LAMP2B gene into Lamp2
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Talking and Listening in the Age of Modernity: Essays on the history of sound
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affects 15-30% of AVM patients. The age of onset typically ranges from early
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to determine mutations, should be performed for confirmation. In addition,
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9 (AAV9)–mediated gene therapy. Clinical studies on mice with the mutated
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There are two major approaches to treating Autophagic Vacuolar Myopathy:
88: 84: 60: 377:(ERT) to compensate for the deficiency of the original enzyme by adding 440: 1224: 452: 381: 346: 337:
As mentioned, the signs and symptoms of Pompe disease, such as poor
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as enzyme activity tests to measure the levels and activity of the
492: 204: 165: 153: 134:, infantile AVM, and adult onset AVM with multiorgan involvement. 72: 289:(IOPD), their symptoms eventually result in their deaths due to 213:
In general, the signs and symptoms of AVM are similar to common
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Though also X-linked, the transmission pattern of XMEA is of a
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Encyclopedic Dictionary of Genetics, Genomics and Proteomics
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Johnson B (November 2007), "9. Voice, Power and Modernity",
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Matzner U (2005). "Therapy of Lysosomal Storage Diseases".
487:, the most common form of AVM, could possibly be cured by 152:
while Danon disease and Pompe Disease are associated with
1054:"Infantile-onset Pompe disease: Diagnosis and management" 35:. The features highlighted are vacuolar membranes of the 508:
by introducing the normal version of the mutated gene.
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as soon as their first year of developing the disease.
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In addition, patients of Danon disease also experience
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Leah Plumb A (April 2004). "Genetics Home Reference".
277:. Carrier females may exhibit these symptoms as well. 479:
of the genes. In this way, AVM can be addressed with
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Other side effects are 684:"Test | Invitae Autophagic Vacuolar Myopathy Panel" 311:, followed by a thorough examination of a person's 242:is exhibited in approximately 20% of patients, and 1514:"Genzyme's Lumizyme clears bioequivalence hurdles" 1100:"Pompe disease diagnosis and management guideline" 217:, including limb-girdle weakness, scapuloperoneal 633:"Autophagic vacuolar pathology in desminopathies" 361:(ECG) to detect abnormal heartbeat patterns, and 1587:"What Makes Genetic Discrimination Exceptional?" 1152:NORD (National Organization for Rare Disorders) 812:, SAGE Publications Ltd, pp. 23–44, 2007, 8: 1148:"X-Linked Myopathy with Excessive Autophagy" 603:"KEGG DISEASE: Autophagic vacuolar myopathy" 443:towards the enzyme, which may snowball into 432:, meaning that ERT is unable to correct the 942:, John Wiley & Sons, Inc., 2004-07-15, 810:Integrative Therapy: A Practitioner's Guide 597: 595: 102:Diagnosis of AVM involves various types of 408:is caused by the deficiency of the enzyme 128:X-linked myopathy with excessive autophagy 1529: 1383: 1123: 1069: 1030: 849: 741: 656: 567: 557: 730:Rinsho Shinkeigaku = Clinical Neurology 516: 1690: 1688: 1482: 1480: 1275: 1273: 1271: 1269: 1171: 1169: 1167: 416:enzyme might induce the production of 285:patients with the progressive form of 1093: 1091: 1089: 1047: 1045: 1043: 1041: 933: 931: 929: 927: 925: 923: 898: 896: 894: 803: 801: 799: 7: 763: 761: 719: 717: 715: 713: 711: 709: 707: 705: 703: 678: 676: 626: 624: 622: 536: 534: 532: 530: 528: 526: 524: 522: 520: 349:, or genetic testing to examine the 1116:10.1097/01.gim.0000218152.87434.f3 1015:"Limb Girdle Muscular Dystrophies" 14: 1455:. Springer US. pp. 112–129. 1058:Archivos Argentinos de Pediatria 972:Archives of Disease in Childhood 393:Enzyme replacement therapy (ERT) 357:to check for an enlarged heart, 52:, affecting people of all ages. 19:(AVM) consists of multiple rare 1593:, Routledge, pp. 169–208, 71:is caused by a mutation of the 1725:Genetic diseases and disorders 1651:Science Translational Medicine 808:"Does Therapy Work and How?", 1: 1696:"How does gene therapy work?" 1032:10.15844/pedneurbriefs-17-5-6 1013:Millichap, J. Gordon (2011), 552:(8): 371.2–371. August 2019. 463:and abnormal blood pressure. 287:infantile-onset Pompe disease 122:There are five types of AVM: 1663:10.1126/scitranslmed.aax1744 1489:"Enzyme Replacement Therapy" 1422:10.1212/WNL.0000000000004711 1256:"Diagnosis of Pompe Disease" 559:10.1212/wnl.0000000000007478 17:Autophagic vacuolar myopathy 1562:"Lumizyme | About Lumizyme" 1487:Schoenbach A (2018-09-10). 1190:10.1001/2013.jamaneurol.486 948:10.1002/0471684228.egp03102 743:10.5692/clinicalneurol.50.1 91:, with Danon Disease being 1741: 1019:Pediatric Neurology Briefs 724:Nishino I (January 2010). 398:Enzyme Replacement Therapy 375:Enzyme Replacement Therapy 108:Enzyme Replacement Therapy 63:in different parts of the 1591:Genetics and Gene Therapy 1376:10.1002/14651858.cd012993 1294:10.1016/j.nmd.2020.02.004 782:10.1108/09504120410528234 649:10.1016/j.nmd.2014.12.002 436:symptoms of the disease. 291:cardiorespiratory failure 1585:Hellman D (2017-09-08), 1461:10.1007/0-387-28957-7_10 1337:10.2174/1566523043346435 1071:10.5546/aap.2019.eng.271 938:"Danon Disease (Xq24)", 851:10.22459/tlam.11.2007.09 818:10.4135/9781446279892.n2 330:in the diagnosis of all 1700:Genetics Home Reference 1626:Genetics Home Reference 1622:"What is gene therapy?" 1599:10.4324/9781315254517-7 1364:Neuromuscular Disorders 1282:Neuromuscular Disorders 984:10.1136/adc.2008.155010 908:Genetics Home Reference 637:Neuromuscular Disorders 422:immunosuppressive drugs 418:neutralising antibodies 400:has been used to treat 324:cardiovascular diseases 215:neuromuscular disorders 1254:Iskit S (3 May 2018). 489:adeno-associated virus 410:acid alpha-glucosidase 344:acid alpha-glucosidase 210: 1512:Ratner M (Aug 2009). 240:Peripheral neuropathy 208: 180:Most of the AVMs are 118:Categories and causes 1531:10.1038/nbt0809-685a 1518:Nature Biotechnology 1325:Current Gene Therapy 1104:Genetics in Medicine 156:gene located on the 430:blood-brain barrier 176:Mode of inheritance 81:autophagic vacuoles 37:autophagic vacuoles 1493:Pompe Disease News 1260:Pompe Disease News 1213:Muscle & Nerve 441:allergic reactions 359:electrocardiograms 229:. Both muscles of 211: 201:Signs and symptoms 194:X-linked recessive 97:X-linked recessive 1657:(535): eaax1744. 1608:978-1-315-25451-7 1470:978-0-387-25562-0 1416:(23): 2365–2373. 1225:10.1002/mus.23643 861:978-1-921313-47-9 827:978-1-4129-1211-2 770:Reference Reviews 389:patients of AVM. 332:muscular diseases 275:pulmonary disease 186:X-linked dominant 93:X-linked dominant 21:genetic disorders 1732: 1710: 1709: 1707: 1706: 1692: 1683: 1682: 1642: 1636: 1635: 1633: 1632: 1618: 1612: 1611: 1582: 1576: 1575: 1573: 1572: 1558: 1552: 1551: 1533: 1509: 1503: 1502: 1500: 1499: 1484: 1475: 1474: 1448: 1442: 1441: 1404: 1398: 1397: 1387: 1355: 1349: 1348: 1320: 1314: 1313: 1277: 1264: 1263: 1251: 1245: 1244: 1208: 1202: 1201: 1173: 1162: 1161: 1159: 1158: 1144: 1138: 1137: 1127: 1095: 1084: 1083: 1073: 1049: 1036: 1035: 1034: 1010: 1004: 1003: 967: 961: 960: 935: 918: 917: 915: 914: 900: 889: 888: 886: 885: 871: 865: 864: 853: 837: 831: 830: 805: 794: 793: 765: 756: 755: 745: 721: 698: 697: 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Retrieved 606: 549: 545: 481:gene therapy 470: 467:Gene therapy 438: 434:neurological 426: 396: 386:gene therapy 372: 355:chest x-rays 336: 317: 303: 295: 279: 256: 212: 191: 179: 170: 158:X chromosome 136: 121: 112:gene therapy 101: 54: 31:features on 29:pathological 25:histological 23:with common 16: 15: 445:anaphylaxis 339:muscle tone 41:sarcolemmal 1705:2020-03-29 1631:2020-03-29 1571:2020-03-29 1524:(8): 685. 1498:2020-03-29 1157:2020-04-06 913:2020-04-06 884:2020-04-22 879:Genome.gov 736:(1): 1–6. 693:2020-03-29 612:2020-03-29 512:References 475:caused by 320:phenotypic 263:arrhythmia 182:sex-linked 73:LAMP2 gene 65:chromosome 1679:213193924 1540:1087-0156 1453:Lysosomes 1410:Neurology 1310:211082029 1025:(5): 39, 790:0950-4125 586:201093720 546:Neurology 477:mutations 449:headaches 414:exogenous 379:exogenous 369:Treatment 305:Diagnosis 300:Diagnosis 252:adulthood 248:childhood 219:dystrophy 85:lysosomes 57:disorders 50:adulthood 46:childhood 1719:Category 1671:32188720 1438:22669525 1430:29117951 1394:26794303 1345:15180583 1302:32173248 1233:23463700 1198:23649721 1134:16702877 1080:31339275 1000:44794844 992:19628877 752:20120346 667:25557463 578:31427494 471:AVM are 457:vomiting 404:. 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Index

genetic disorders
histological
pathological
muscle biopsy
autophagic vacuoles
sarcolemmal
childhood
adulthood
disorders
mutation
chromosome
Danon disease
LAMP2 gene
XMEA
autophagic vacuoles
lysosomes
X-linked
X-linked dominant
X-linked recessive
genetic testing
Enzyme Replacement Therapy
gene therapy
Danon disease
X-linked myopathy with excessive autophagy
Pompe Disease
Danon disease
XMEA
Pompe Disease
Xq28
LAMP2

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