{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,18]],"date-time":"2025-10-18T00:32:42Z","timestamp":1760747562505,"version":"build-2065373602"},"reference-count":12,"publisher":"BMJ","issue":"5","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["J Med Genet"],"published-print":{"date-parts":[[1982,10]]},"abstract":"<jats:p>In a study of 35 index patients who developed myotonic dystrophy between birth and 30 years (neonatal cases aware excluded), 30 could be categorised into two clinical types. The 13 type 1 patients had a more severe limb weakness, of patchy distribution, associated with proportional facial weakness. The 17 type 2 patients had a milder and more diffuse limb weakness; their facial weakness, however, was very pronounced and preceded the limb weakness by several years. All but one of the 25 affected relatives who were examined belonged to the same category as their index relative, providing evidence that the cause of the clinical heterogeneity was genetic. Subsequent observations showed that mental retardation, male infertility, and neonatally affected offspring were commoner in type 2 patients. Congenital myotonic dystrophy could occur among the offspring of either affected males or affected females, but neonatal symptoms were confined to the offspring of affected women. The overall risk for having neonatally affected offspring for this prospective study of young adult patients was 7 in 38, and for the offspring of affected females 7 in 27. The risk for having a surviving child whose mental or physical handicap or both required special schooling was 1 in 12 for males and 4 in 27 for females.<\/jats:p>","DOI":"10.1136\/jmg.19.5.341","type":"journal-article","created":{"date-parts":[[2008,11,10]],"date-time":"2008-11-10T14:52:06Z","timestamp":1226328726000},"page":"341-348","source":"Crossref","is-referenced-by-count":19,"title":["Clinical evidence for heterogeneity in myotonic dystrophy."],"prefix":"10.1136","volume":"19","author":[{"given":"S","family":"Bundey","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"239","published-online":{"date-parts":[[1982,10,1]]},"reference":[{"key":"ref_1","first-page":"53","article-title":"Early-onset dystrophia myotonica: evidence supporting a maternal environmental factor","volume":"ii:","year":"1972","unstructured":"Harper PS, Dyken PR. Early-onset dystrophia myotonica: evidence supporting a maternal environmental factor. 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Arch Dis Child 1979;54:331-8.","journal-title":"Arch Dis Child"},{"key":"ref_7","article-title":"Thomsen's disease (myotonia congenita), paramyotonia, and dystrophia myotonica","author":"Myotonia, Thomasen E.","year":"1948","unstructured":"Thomasen E. Myotonia. Thomsen's disease (myotonia congenita), paramyotonia, and dystrophia myotonica. Denmark: Universitetsforlaget i Aarhus, 1948."},{"issue":"32","key":"ref_8","first-page":"187","article-title":"Myotonia atrophica","volume":"1909","author":"Batten, F.E.; Gibb, H.P.","unstructured":"Batten FE, Gibb HP. Myotonia atrophica. Brain 1909; 32:187-205.","journal-title":"Brain"},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"311","DOI":"10.1136\/jmg.9.3.311","article-title":"Genetic heterogeneity for dystrophia myotonica","volume":"9","author":"Bundey, S.; Carter, C.O.","year":"1972","unstructured":"Bundey S, Carter CO. Genetic heterogeneity for dystrophia myotonica. J Med Genet 1972;9:311-5.","journal-title":"J Med Genet"},{"key":"ref_10","first-page":"301","article-title":"The age of onset and the age of death in patients with dystrophia myotonica","volume":"23","author":"Grimm, T.","year":"1975","unstructured":"Grimm T. The age of onset and the age of death in patients with dystrophia myotonica. J Genet Hum 1975; 23:301-8.","journal-title":"J Genet Hum"},{"key":"ref_11","first-page":"497","article-title":"Myotonia dystrophica: unusual features in a Labrador family","volume":"118","author":"Webb, D.; Mathews, A.; Harris, M.","year":"1978","unstructured":"' Webb D, Mathews A, Harris M, et al. Myotonia dystrophica: unusual features in a Labrador family. Can Med Assoc J 1978;118:497-500.","journal-title":"Can Med Assoc J"},{"key":"ref_12","article-title":"Myotonic dystrophy","author":"Harper, P.S.","year":"1979","unstructured":"Harper PS. Myotonic dystrophy. Philadelphia, London, Toronto: Saunders, 1979."}],"container-title":["Journal of Medical Genetics"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/syndication.highwire.org\/content\/doi\/10.1136\/jmg.19.5.341","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,17]],"date-time":"2025-10-17T17:47:09Z","timestamp":1760723229000},"score":1,"resource":{"primary":{"URL":"https:\/\/jmg.bmj.com\/lookup\/doi\/10.1136\/jmg.19.5.341"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[1982,10]]},"references-count":12,"journal-issue":{"issue":"5","published-online":{"date-parts":[[1982,10,1]]},"published-print":{"date-parts":[[1982,10]]}},"alternative-id":["10.1136\/jmg.19.5.341"],"URL":"https:\/\/doi.org\/10.1136\/jmg.19.5.341","relation":{},"ISSN":["0022-2593","1468-6244"],"issn-type":[{"type":"print","value":"0022-2593"},{"type":"electronic","value":"1468-6244"}],"subject":[],"published":{"date-parts":[[1982,10]]}}}