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Myotonia

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159: 383:. Similar to Paramyotonia Congenita, where potassium exacerbates myotonia in many phenotypes, Hyperkalemic Periodic Paralysis is another disorder of the SCN4A gene where high blood potassium levels result in muscle weakness, muscle paralysis (through weakness or through over excitation preventing movement), and sometimes myotonia. Many phenotypes of HyperKPP result in issues regulating blood potassium levels, often cause it to be high or causing 27: 119: 247:
Generally, repeated contraction of the muscle can alleviate the myotonia and relax the muscles thus improving the condition, however, this is not the case in paramyotonia congenita. This phenomenon is known as the "warm-up" reflex and is not to be confused with warming up before exercise, though they
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encoding the ClC-1 ion channel. More than 130 different mutations exist in total, and a large phenotypic variation is therefore present in this disease. The mutations are loss-of-function mutations that render the ClC-1 ion channel dysfunctional to varying degrees, with reduced chloride conductance
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a nucleotide expansion of either of two genes, related to type of disease, results in failure of correct expression (splicing of the mRNA) of the ClC-1 ion channel, due to accumulation of RNA in the cytosol of the cell. The ClC-1 ion channel is responsible for the major part of chloride conductance
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gene that causes skeletal muscles to be unable to relax after contracting in bouts, typically following the consumption of potassium rich food. It is debated if potassium-aggravated myotonia is a distinct disease from Paramyotonia Congenita, and recent academic papers have classified it both ways.
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Myotonia could be caused by genetic mutations in the SCN4A gene that encodes the skeletal muscle sodium channel subtype 4 (Nav1.4). Some studies have suggested that changes in physiological pH could have modulatory effects on Nav1.4 sodium channels, which could have manifestations in myotonic
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McClatchey, Andrea I.; McKenna-Yasek, Diane; Cros, Didier; Worthen, Hilary G.; Kuncl, Ralph W.; DeSilva, Shari M.; Cornblath, David R.; Gusella, James F.; Brown, Robert H. (October 1992). "Novel mutations in families with unusual and variable disorders of the skeletal muscle sodium channel".
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Birnberger, KL; Rüdel, R; Struppler, A (1 September 1975). "Clinical and electrophysiological observations in patients with myotonic muscle disease and the therapeutic effect of N-propyl-ajmaline".
403:. It too can result in myotonia, in addition to weakness and paralysis (from both lack of and excess signal to muscles). It also has been found to occur due to gene mutations other than SCN4A. 1484: 1591: 248:
may appear similar. Individuals with the disorder may have trouble releasing their grip on objects or may have difficulty rising from a sitting position and a stiff, awkward gait.
353:). This inability of muscles to relax worsening with exercise is often termed "paradoxical myotonia." Paramyotonia also frequently triggered by exercise, cold, and potassium. 37: 1596: 712: 905:
Kwieciński, H; Lehmann-Horn, F; Rüdel, R (January 1984). "The resting membrane parameters of human intercostal muscle at low, normal, and high extracellular potassium".
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1.4 in skeletal muscle fiber membrane. Mutations may alter the kinetics of the channel, such that the channel fails to inactivate properly, thus allowing spontaneous
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Progressive Muskeldystrophie Myotonie · Myasthenie: Symposium vom 30. November bis 4. Dezember 1965 anläßlich der 125. Wiederkehr des Geburtstages von Wilhelm Erb
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to occur after voluntary activity has terminated, prolonging relaxation of the muscle, or can result in paralysis if the relaxation is severely prolonged (see
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Myotonia occurs also in certain types of limb-girdle muscular dystrophies, myofibrillary myopathies, distal myopathies, and inclusion body myopathies. Other
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as a result. Reduced chloride conductance may result in myotonia, due to accumulation of potassium in the transverse-tubules in skeletal muscle (see
825:"Expanded CUG repeats trigger aberrant splicing of ClC-1 chloride channel pre-mRNA and hyperexcitability of skeletal muscle in myotonic dystrophy" 1014: 758: 550: 270:
Myotonia may present in the following diseases, with different causes related to the ion channels in the skeletal muscle fiber membrane (
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Myotonia can affect all muscle groups; however, the pattern of affected muscles can vary depending on the specific disorder involved.
1126:"A Mixed Periodic Paralysis & Myotonia Mutant, P1158S, Imparts pH-Sensitivity in Skeletal Muscle Voltage-gated Sodium Channels" 291:). When the splicing of the mRNA was corrected in vitro, ClC-1 channel function was greatly improved and myotonia was abolished. 380: 229: 396: 303:) of which two types called Becker's disease and Thomsen's disease exist. Both diseases are caused by mutations in the gene 361: 431: 418:
activity resulting from repetitive motor unit action potentials of peripheral origin. 100-200 cases have been reported.
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Vicart, S.; Sternberg, D.; Fontaine, B.; Meola, G. (1 October 2005). "Human skeletal muscle sodium channelopathies".
70: 866:"Loss of the muscle-specific chloride channel in type 1 myotonic dystrophy due to misregulated alternative splicing" 1310:
Vicart, S.; Sternberg, D.; Fontaine, B.; Meola, G. (October 2005). "Human skeletal muscle sodium channelopathies".
950:"Correction of ClC-1 splicing eliminates chloride channelopathy and myotonia in mouse models of myotonic dystrophy" 319:
Symptoms of myotonia (documented in myotonia congenita) are more frequently experienced in women during pregnancy.
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Mankodi, A; Takahashi, MP; Jiang, H; Beck, CL; Bowers, WJ; Moxley, RT; Cannon, SC; Thornton, CA (July 2002).
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Braz, Luís; Soares-Dos-Reis, Ricardo; Seabra, Mafalda; Silveira, Fernando; Guimarães, Joana (October 2019).
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in the skeletal muscle cell, and lack of sufficient chloride conductance may result in myotonia, (see
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transport) has symptoms similar to myotonia congenita, however, the delayed muscle relaxation is
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Basu, A; Nishanth, P; Ifaturoti, O (July 2009). "Pregnancy in women with myotonia congenita".
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People with disorders involving myotonia can have life-threatening reactions to certain
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after voluntary contraction or electrical stimulation, and the muscle shows an abnormal
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Colding-Jørgensen, Eskild (July 2005). "Phenotypic variability in myotonia congenita".
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Charlet-B, N; Savkur, RS; Singh, G; Philips, AV; Grice, EA; Cooper, TA (July 2002).
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Gutmann, Laurie; Phillips, Lawrence H., 2nd (September 1991). "Myotonia congenita".
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Wheeler, TM; Lueck, JD; Swanson, MS; Dirksen, RT; Thornton, CA (December 2007).
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disorders characterized by delayed relaxation (prolonged contraction) of the
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if you can. Unsourced or poorly sourced material may be challenged and
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as the EMG is normal. Other diseases that exhibit pseudo-myotonia are
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Killian, James M. (1 January 2010), Rolak, Loren A. (ed.),
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Ghovanloo MR, Abdelsayed M, Peters CH, Ruben PC (2018).
52: 1001:. Advances in Genetics. Vol. 63. pp. 25–55. 1489: 739:"The Differentiation of Myotonia and Pseudomyotonia" 1493: 1083:
International Journal of Gynaecology and Obstetrics
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Delayed relaxation of muscles following contraction
430:may cause it as well. It is also associated with 312:). This is the same genetic disease that makes 659:"Brody disease: when myotonia is not myotonia" 51:Please review the contents of the article and 1592:Myoneural junction and neuromuscular diseases 314:certain strains of North American goats faint 8: 515:: CS1 maint: multiple names: authors list ( 282:Two documented types, DM1 and DM2 exist. In 1401:Narayanaswami, P; Weiss, M (October 2014). 1386:: CS1 maint: numeric names: authors list ( 737:Tyler, Frank H. (1966), Kuhn, Erich (ed.), 171:is a symptom of a small handful of certain 1597:Symptoms and signs: musculoskeletal system 1490: 519:) CS1 maint: numeric names: authors list ( 364:(PAM) results from in a mututation of the 331:This disease results from mutation in the 157: 130: 1426: 1157: 973: 881: 840: 633: 545:, Philadelphia: Mosby, pp. 428–435, 186:Myotonia is the defining symptom of many 997:Lossin, Christoph; George AL jr (2008). 713:"Isaacs Syndrome - Neurologic Disorders" 465: 1379: 508: 387:, further exacerbating the condition. 954:The Journal of Clinical Investigation 7: 1361:RESERVED, INSERM US14-- ALL RIGHTS. 570: 568: 532: 530: 1587:Symptoms and signs: Nervous system 717:Merck Manuals Professional Edition 260:anaesthesia-induced rhabdomyolysis 14: 543:Neurology Secrets (Fifth Edition) 117: 25: 1234:"Potassium-aggravated myotonia" 675:10.1136/practneurol-2019-002224 539:"CHAPTER 26 - Electromyography" 375:Hyperkalemic periodic paralysis 230:hyperkalemic periodic paralysis 600:Kim, June-Bum (January 2014). 391:Hypokalemic periodic paralysis 53:add the appropriate references 1: 1007:10.1016/S0065-2660(08)01002-X 883:10.1016/s1097-2765(02)00572-5 842:10.1016/s1097-2765(02)00563-4 362:Potassium-aggravated myotonia 357:Potassium-aggravated myotonia 1419:10.1212/WNL.0000000000000892 1363:"Orphanet: Search a disease" 751:10.1007/978-3-642-92920-5_39 606:Korean Journal of Pediatrics 339:voltage-gated sodium channel 234:anterior horn cell disorders 38:reliable medical references 1613: 1232:Reference, Genetics Home. 1150:10.1038/s41598-018-24719-y 1095:10.1016/j.ijgo.2009.01.031 1455:rarediseases.info.nih.gov 1324:10.1007/s10072-005-0461-x 1195:10.1007/s10072-005-0461-x 226:glycogen storage diseases 44:or relies too heavily on 432:Schwartz–Jampel syndrome 1238:Genetics Home Reference 618:10.3345/kjp.2014.57.1.1 487:10.1055/s-2008-1041228 454:Malignant hyperthermia 449:Neuromuscular medicine 327:Paramyotonia congenita 200:paramyotonia congenita 149:neuromuscular medicine 1312:Neurological Sciences 1183:Neurological Sciences 919:10.1002/mus.880070110 475:Seminars in Neurology 782:Journal of Neurology 1142:2018NatSR...8.6304G 663:Practical Neurology 301:Congenital myotonia 194:transport) such as 1273:10.1038/ng1092-148 1130:Scientific Reports 1040:Muscle & Nerve 999:Myotonia Congenita 907:Muscle & Nerve 794:10.1007/BF00316381 337:gene encoding the 310:myotonia congenita 295:Myotonia congenita 289:myotonia congenita 284:myotonic dystrophy 278:Myotonic dystrophy 204:myotonic dystrophy 196:myotonia congenita 1574: 1573: 1413:(16): 1453–1463. 1052:10.1002/mus.20295 1016:978-0-12-374527-9 760:978-3-642-92920-5 602:"Channelopathies" 580:www.ninds.nih.gov 552:978-0-323-05712-7 347:action potentials 242:Hoffmann syndrome 166: 165: 128:Medical condition 126: 125: 102: 1604: 1491: 1466: 1465: 1463: 1461: 1447: 1441: 1440: 1430: 1398: 1392: 1391: 1385: 1377: 1375: 1373: 1358: 1352: 1351: 1307: 1301: 1300: 1255: 1249: 1248: 1246: 1244: 1229: 1223: 1222: 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Edit this on Wikidata
neuromuscular
skeletal muscles
EMG
channelopathies
ion channel
myotonia congenita
paramyotonia congenita
myotonic dystrophy
Brody disease
ion pump
myositis
glycogen storage diseases
hyperkalemic periodic paralysis
anterior horn cell disorders

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