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Clinical Chemistry 36: 427-430, 1990;
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Clinical Chemistry, Vol 36, 427-430, Copyright © 1990 by American Association for Clinical Chemistry

Muscle enzymes and isoenzymes in Emery-Dreifuss muscular dystrophy

MG Bialer, DE Bruns and TE Kelly
Department of Pediatrics, University of Virginia, Charlottesville 22908.

Emery-Dreifuss muscular dystrophy (EDMD) is a rare X-linked muscular dystrophy. Creatine kinase (CK) activity usually is increased in serum of affected males, but results for aldolase and lactate dehydrogenase (LD) in serum have been inconsistent, as have those for CK in carrier females. There have been few studies of CK-MB or LD isoenzyme-1 (LD-1) in EDMD. We measured CK, CK-MB, LD, LD-1, and aldolase activity in sera of 84 members of two large families with EDMD. DNA analysis had been carried out on all subjects. Although CK, LD, and aldolase activities were significantly increased in affected males, CK activity was the most consistently increased and was the least subject to artifactual increases. Mean CK-MB in serum was mildly increased, but LD-1 was within the normal reference interval, suggesting that CK-MB is increased in skeletal muscle in EDMD, as has been found in other forms of dystrophy. CK decreased with age in affected males. We saw no significant increases of muscle enzymes or isoenzymes in 33 EDMD carriers studied, of whom 19 were obligate carriers and 14 had been identified by DNA analysis.


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