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Congenital myopathy

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spirals are unusual membrane structures that have a spiral pattern. These membrane structures are seen during electron microscopic examination of the affected muscle. These structures merge into or are surrounded by tubular structures that resemble tubular aggregates. Tubular aggregates are abnormal accumulations of membranous tubules and have been observed in a wide variety of muscle diseases and originate from the sarcoplasmic reticulum. Cylindrical spirals were first described in 1979 and were thought to be a non-specific reaction of skeletal muscle secondary to a metabolic disturbance or muscle fibre injury. The molecular basis of cylindrical spiral myopathy is currently unknown, however a genetic mutation affecting the
39: 306:, is associated with small areas of decreased oxidative activities, resulting in areas that appear in this histology as "cores". These appear through microscopy very similar to central core, however the cores are typically smaller in multicore myopathy. As with congenital fiber type disproportion, patients have a greater number of type 1 fibers. Overall, approximately half of diagnosed individuals report no progression of muscle weakness, while half report a very slow progression. 253:, is recognized by pain during exercise and difficulty walking. People affected by this disease typically are wheelchair-reliant by middle adulthood, have weakness in the muscles involved in eye movement, nerve function disorders, and some form of intellectual disability. Myotubular myopathy is very rare, with less than 50 families currently affected. Genetically, myotubular myopathy can have two causes: autosomal dominant and autosomal recessive. When caused by a mutation in the 145: 291:
abundant than type 2 fibers. This leads to affected individuals being able to maintain an active lifestyle, though they usually have lower levels of stamina. Severity with this disease varies greatly, but people typically present symptoms by the age of one. Individuals do not usually worsen with time, and cases have even been reported of improvements.
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was first described in 1956 and usually presents in infancy or early childhood as non-progressive mild proximal weakness that persists throughout life. Central core disease is believed to be more prevalent than currently reported, as it is hard to recognize and often misdiagnosed in early childhood.
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Myopathies with varying fiber size, such as congenital fiber type disproportion, occurs when type 1 fibers, the slow twitch fibers involved in sustaining activity, are smaller than type 2 fibers, the fast twitch fibers involved in quick activity. Since smaller type 1 fibers is not associated with
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is a very broad term for any muscle disorder present at birth. This defect primarily affects skeletal muscle fibres and causes muscular weakness and/or hypotonia. Congenital myopathies account for one of the top neuromuscular disorders in the world today, comprising approximately 6 in 100,000 live
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Myopathies with central nuclei, such as myotubular myopathy, involves an error in the gene involved in vesicle movement throughout the cell. This creates problems in vesicles reaching the plasma membrane with the cellular components necessary to fuse myoblast, a major step in the formation of the
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Cylindrical spirals myopathy is very rare with only 18 individual cases described as of 2013. The majority of cases are sporadic, and has been observed in only 3 families. It is characterized by the presence of cylindrical spirals as the main pathological finding in muscle biopsies. Cylindrical
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Nemaline myopathy was first described in 1963 and is the most common congenital myopathy. It is characterized by generalized muscle weakness and low muscle tone. In its severest form, affected babies often die from respiratory failure. To date, 9 gene mutations have been found to cause nemaline
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Congenital fiber type disproportion affects skeletal muscle, typically causing weakness in the shoulders, upper arms, thighs, and hips. Skeletal muscle is made up of two kinds of fiber, type 1 and type 2. In congenital fiber type disproportion, type 1 fibers are not only smaller but often more
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can be run to check the electrical activity of the muscle. Diagnosis heavily relies on muscle pathology, where a muscle biopsy is visualised on the cellular level. Diagnosis usually relies on this method, as creatine kinase levels and electromyography can be unreliable and non-specific. Since
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Currently, there are no treatments for any of the congenital myopathies. Depending on the severity, there are different therapies available to help alleviate any pain and aid patients in performing varying activities. For example, many congenital myopathy patients are involved in physical or
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nemaline myopathy, the most common type of congenital myopathy, it has not been studied in as great detail as many of the others. However, the smaller type 1 fibers explains why patients typically can participate in activities for shorter periods of time, but struggle with extended activity.
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Gang, Qiang; Bettencourt, Conceição; Brady, Stefen; Holton, Janice L.; Healy, Estelle G.; McConville, John; Morrison, Patrick J.; Ripolone, Michela; Violano, Raffaella; Sciacco, Monica; Moggio, Maurizio; Mora, Marina; Mantegazza, Renato; Zanotti, Simona; Wang, Zhaoxia (January 2022).
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occupational therapy in an attempt to strengthen their skeletal muscles. Orthopedic surgery is usually necessary to correct skeletal deformities secondary to muscle weakness, such as scoliosis. Survival is typically determined by the level of respiratory muscle insufficiency.
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Chevessier, F; Marty, I; Paturneau-Jouas, M; Hantaı̈, D; Verdière-Sahuqué, M (2004). "Tubular aggregates are from whole sarcoplasmic reticulum origin: Alterations in calcium binding protein expression in mouse skeletal muscle during aging".
278:, which is a life-threatening anesthetic reaction that causes a rise in body temperature, muscular rigidity and muscular breakdown, grossly elevated creatine kinase, and acidosis. Central core disease is caused by a mutation in the 1457: 1442: 225:
myopathy. 6 of the identified genes are associated with the actin filament, which is the basis for muscle contraction. Histologically, nemaline rods stain red with Gomori's trichrome and are mostly seen in the
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Rapuzzi, S; Prelle, A; Moggio, M; Rigoletto, C; Ciscato, P; Comi, G; Francesca, F; Scarlato, G (1995). "High serum creatine kinase levels associated with cylindrical spirals at muscle biopsy".
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gene, the disease is instead autosomal recessive, and both genes must be mutated for the disease to be inherited. Autosomal recessive onset is most common.
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skeletal muscle. This creates structural problems throughout the skeletal muscle and in the Z line of the sarcomere, creating the weakness in the muscle.
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Taratuto, AL; Matteucci, M; Barreiro, C; Saccolitti, M; Sevlever, G (1991). "Autosomal dominant neuromuscular disease with cylindrical spirals".
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Although tubular aggregates are seen in a variety of myopathies, both genetic and environmental, the congenital myopathies associated with genes
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and protein accumulation is a broad category, and some congenital myopathies that fall within this group are well understood, such as
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have been shown to bind to cylindrical spirals. Cylindrical spirals have also been shown to react with the mitochondrial enzyme
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gene, the disorder is autosomal dominant, meaning it can be passed on by one mutated gene. When the mutation takes place in the
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region of muscle fibres. Nemaline rods have also been observed in the intermyofibrillar region of muscle fibres and within the
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Malfatti, Edoardo; Chaves, Marcelo; Bellance, Remi; Sarrazin, Elizabeth; Fardeau, Michel; Romero, Norma (February 12, 2013).
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Bove, KE; Iannaccone, ST; Hilton, PK; Samaha, F. (June 1980). "Cylindrical spirals in a familial neuromuscular disorder".
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Is a congenital disorder, meaning it occurs during development and symptoms present themselves at birth or in early life.
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Phenotypes are quite variable, and manifestations can include weakness, abnormal gait, myotonia, cramps, and scoliosis.
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Carpenter, S.; Karpati, G.; Robitaille, Y.; Melmed, C. (Jul–Aug 1979). "Cylindrical spirals in human skeletal muscle".
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There are rarely any specific tests for the congenital myopathies except for muscle biopsy. Tests can be run to check
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Ryan MM, Schnell C, Strickland CD, et al. (September 2001). "Nemaline myopathy: a clinical study of 143 cases".
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A distinctive abnormality in skeletal muscle fibres on the cellular level; observable via light microscope
1734: 1702: 1414: 864: 755:"A New Congenital Non-Progressive Myopathy – Central core disease and nemaline myopathy in one family" 1998: 1659: 1969: 1472: 38: 2081: 332: 299: 107: 1984: 1877: 1796: 1549: 316: 275: 639:"Nemaline myopathy: current concepts. The ENMC International Consortium and Nemaline Myopathy" 2109: 1553: 205: 1102:"Cylindrical Spirals Congenital Myopathy Associated with Epileptic Encephalopathy (P07.050)" 1922: 559:
Shy, G. Milton; Engel, W. King; Somers, J. E.; Wanko, Theodor (1963). "Nemaline Myopathy".
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The conditions included under the term "congenital myopathy" can vary. One source includes
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births every year. As a whole, congenital myopathies can be broadly classified as follows:
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congenital myopathies are genetic, there have been advancements in prenatal screenings.
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in the blood, which is often normal or mildly elevated in congenital myopathies.
180: 1993: 1988: 1946: 1858: 1290: 688:"Nemaline myopathy caused by mutations in the muscle alpha-skeletal-actin gene" 1451: 1229: 1035: 949: 903: 480: 2133: 1865: 1827: 1677: 1590: 1331: 1237: 572: 324: 2045: 1804: 1349: 1255: 957: 804: 721: 615: 580: 488: 446: 427: 230: 1187: 1144: 1136: 1078: 992: 921: 822: 672: 2027: 1000: 773: 654: 144: 1815: 1723: 1574: 1323: 1070: 351: 335:, which suggests that cylindrical spirals originate from mitochondria. 91: 1434: 362:
is autosomal dominant myosin storage congenital myopathy-7A (CMYP7A).
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GeneReviews/NCBI/NIH/UW entry on Congenital Fiber-Type Disproportion
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Afifi, Adel K.; Smith, James W.; Zellweger, Hans (April 1, 1965).
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Myopathies with inclusion bodies and abnormal protein accumulation
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North, Kathryn (2008). "What's new in congenital myopathies?".
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are known as tubular aggregate myopathy (TAM) types 1 and 2.
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North KN, Laing NG, Wallgren-Pettersson C (September 1997).
1388:"Phenotypic Series - PS160565 - Tubular aggregate myopathy" 1274:"Therapeutic approaches in different congenital myopathies" 1022:
Yan, C.Z.; Xu, J.W.; Zhao, Y.Y.; Li, W. (2014). "G.p.159".
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genetic disorder. Sporadic cases have also been described.
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Ilkovski B, Cooper ST, Nowak K, et al. (June 2001).
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Denborough, M. A.; Dennett, X; Anderson, R. M. (1973).
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National Institute of Neurological Disorders and Stroke
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Central core disease has been found to be allelic with
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Gineste, Charlotte; Laporte, Jocelyn (February 2023).
285: 593: 1424: 1364:"Tubular aggregates: Other occasional associations" 839:. Muscular Dystrophy Campaign. 2012. Archived from 752: 685: 558: 1212:Tajsharghi, Homa; Oldfors, Anders (January 2013). 1211: 789:"Central-core disease and malignant hyperpyrexia" 117: 2131: 885: 309: 1312:Annals of Clinical and Translational Neurology 1271: 886:Myong, NH; Kang, YK; Chi, JG; Suk, SI (1993). 404: 402: 400: 2140:Myoneural junction and neuromuscular diseases 1529: 365: 1021: 397: 1536: 1522: 1214:"Myosinopathies: pathology and mechanisms" 341: 37: 1339: 1289: 1245: 911: 812: 711: 662: 436: 426: 408: 97: 462: 460: 458: 456: 264: 2132: 859: 857: 511:"Congenital Myopathy Information Page" 244: 1517: 1267: 1265: 1207: 1205: 865:"Congenital fiber-type disproportion" 539: 466: 294: 94:, which leads to muscle dysfunction. 517:. September 30, 2011. Archived from 503: 453: 219: 139: 127:Myopathies with fiber size variation 888:"Multicore myopathy--a case report" 854: 286:Congenital fiber type disproportion 249:Myotubular myopathy, also known as 210:congenital fiber type disproportion 13: 1797:BIN1-linked centronuclear myopathy 1408: 1262: 1202: 692:American Journal of Human Genetics 319:in some patients seems likely, as 14: 2151: 2078:Testosterone deficiency myopathy 1586:Lambert–Eaton myasthenic syndrome 1420: 892:Journal of Korean Medical Science 873:U.S. National Library of Medicine 415:Orphanet Journal of Rare Diseases 72: 2034:Kocher–Debre–Semelaigne syndrome 1683:Limb-girdle muscular dystrophy 2 1640:Limb-girdle muscular dystrophy 1 1112:. American Academy of Neurology. 143: 59:Symptoms of muscle weakness and 1380: 1356: 1298: 1278:Current Opinion in Pharmacology 1159: 1116: 1093: 1050: 1015: 972: 928: 879: 829: 780: 746: 548:. Merck Sharp & Dohme Corp. 1975:Fatty-acid metabolism disorder 1598:Congenital myasthenic syndrome 728: 679: 630: 587: 552: 533: 346:In myosin storage myopathies, 118:Myopathies with central nuclei 1: 2087:Hypogonadotropic hypogonadism 390: 1180:10.1016/0960-8966(91)90006-e 381: 310:Cylindrical spirals myopathy 174: 7: 643:Journal of Medical Genetics 82:Congenital myopathies with 10: 2156: 1291:10.1016/j.coph.2022.102328 837:"Fibre-type disproportion" 366:Tubular aggregate myopathy 233:. Nemaline myopathy is an 2102: 2064:Hyperparathyroid myopathy 2018: 1959: 1935: 1915: 1885: 1840: 1826: 1754: 1713: 1668: 1630: 1615: 1606: 1560: 1487: 1428: 1230:10.1007/s00401-012-1024-2 1036:10.1016/j.nmd.2014.06.189 950:10.1016/j.nmd.2003.11.007 904:10.3346/jkms.1993.8.4.312 540:Rubin, M. (August 2009). 481:10.1016/j.nmd.2008.04.002 409:Jungbluth, Heinz (2007). 26: 21: 2059:Hypoparathyroid myopathy 1970:Glycogen storage disease 736:"Centronuclear myopathy" 269:Central core disease or 191: 135: 2082:Late-onset hypogonadism 2073:Corticosteroid myopathy 1791:adaptor protein disease 1368:neuromuscular.wustl.edu 1168:Neuromuscular Disorders 1024:Neuromuscular Disorders 938:Neuromuscular Disorders 869:Genetics Home Reference 793:British Medical Journal 740:Genetics Home Reference 542:"Congenital Myopathies" 469:Neuromuscular Disorders 342:Myosin storage myopathy 333:succinate dehydrogenase 1985:Mitochondrial myopathy 1878:Paramyotonia congenita 1550:neuromuscular junction 805:10.1136/bmj.1.5848.272 573:10.1093/brain/86.4.793 428:10.1186/1750-1172-2-25 411:"Central core disease" 317:sarcoplasmic reticulum 276:malignant hyperthermia 251:centronuclear myopathy 152:This section is empty. 68:Is a genetic disorder. 2110:Inflammatory myopathy 1554:neuromuscular disease 1218:Acta Neuropathologica 1137:10.1002/ana.410070608 1059:Acta Neuropathologica 993:10.1002/mus.880020407 271:central core myopathy 206:central core myopathy 98:Myopathies with cores 1923:Central core disease 1805:cytoskeleton disease 774:10.1212/WNL.15.4.371 655:10.1136/jmg.34.9.705 521:on February 13, 2007 350:accumulates beneath 302:also referred to as 265:Central core disease 114:, in muscle fibres. 2115:Congenital myopathy 2092:Androgen deficiency 2052:Thyrotoxic myopathy 1650:Facioscapulohumeral 1125:Annals of Neurology 875:. December 2, 2012. 596:Annals of Neurology 245:Myotubular myopathy 239:autosomal recessive 202:myotubular myopathy 49:Congenital myopathy 22:Congenital Myopathy 1961:Metabolic myopathy 1887:Periodic paralysis 1849:Myotonia congenita 1617:Muscular dystrophy 1488:External resources 1324:10.1002/acn3.51477 1071:10.1007/bf00318582 300:Multicore myopathy 295:Multicore myopathy 235:autosomal dominant 214:multicore myopathy 2127: 2126: 2123: 2122: 2039:Hoffmann syndrome 1931: 1930: 1811:Nemaline myopathy 1750: 1749: 1581:Myasthenia gravis 1511: 1510: 304:minicore myopathy 237:and sometimes an 220:Nemaline myopathy 198:nemaline myopathy 172: 171: 88:nemaline myopathy 46: 45: 16:Medical condition 2147: 2069:Hypercortisolism 1980:AMPD1 deficiency 1936:ATPase disorder 1838: 1837: 1769:Bethlem myopathy 1763:collagen disease 1755:Other structural 1628: 1627: 1613: 1612: 1566:junction disease 1538: 1531: 1524: 1515: 1514: 1426: 1425: 1402: 1401: 1399: 1398: 1384: 1378: 1377: 1375: 1374: 1360: 1354: 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Index

Specialty
Neurology
Edit this on Wikidata
hypotonia
inclusion bodies
sarcoplasm
NADH
SDH
COX

adding to it
creatine kinase
Electromyography
nemaline myopathy
myotubular myopathy
central core myopathy
congenital fiber type disproportion
multicore myopathy
subsarcolemmal
nucleus
autosomal dominant
autosomal recessive
DNM2
BIN1
malignant hyperthermia
RYR1
Multicore myopathy
sarcoplasmic reticulum
SERCA1
calsequestrin

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