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- W2044348566 abstract "Muscle biopsies taken from 4 patients with clinical diagnosis of Schwartz-Jampel syndrome were analyzed by enzyme-histochemical immunocytochemical and biochemical techniques. In situ distribution of the different myosin heavy chain (MHC) isoforms together with that of the cytoskeletal proteins vimentin, desmin and titin was determined in type I, type IIA, type IIB and type IIC fibers. The same muscle biopsies were analyzed for their content in myosin light chains (MLC) by two-dimensional gel electrophoresis and native myosin isoforms by pyrophosphate gel electrophoresis. The opportunity to study 4 patients of different ages, all members of the same family, permitted us to reveal several interesting features in this rare and so far poorly understood muscle pathology. (i) We observed a predominance of slow (type I) fibers in the oldest patient. (ii) Two classes of small clusters of atrophic type IIC fibers were observed. The first class corresponded to fibers which coexpressed embryonic, fetal and fast, but not slow, MHC isoforms. The fibers also displayed an abnormal distribution of desmin, vimentin and titin. The second class was composed by fibers coexpressing embryonic, fetal, fast and slow, MHC isoforms. In contrast to that observed for the first class, fibers in the second class displayed a normal pattern of expression of desmin, vimentin and titin. (iii) A familial heterogeneity was observed between the 4 patients. The pathological processes involved in the evolution of this syndrome are discussed." @default.
- W2044348566 created "2016-06-24" @default.
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- W2044348566 date "1991-07-01" @default.
- W2044348566 modified "2023-09-26" @default.
- W2044348566 title "Modification in the expression and localization of contractile and cytoskeletal proteins in Schwartz-Jampel syndrome" @default.
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- W2044348566 doi "https://doi.org/10.1016/0022-510x(91)90217-u" @default.
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