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We report adhalin deficiency in 8 patients with clinically diagnosed muscular dystrophy,dystrophic histopathological features,high plasma creatine kinase levels,normal expression of dystrophin,and marked variability of symptoms.Although the distribution of hyposthenia was similar in all 8 patients and predominantly involved muscles in the pelvic girdle,age at onset and rate of disease progression were highly variable: In 2 patients onset,at ages 24 and 25,was later than has previously been observed.We found no apparent relation between disease,severity and the quantity of adhalin expressed.Two kinds of myopathy with adhalin deficiency have been reported:one caused by a mutation in the adhalin gene on chromosome 17(primary adhalinopathy)and the other linked to chromosome 13.The product of the gene on chromosome 13 is probably associated with adhalin and its deficiency results in secondary adhalinopathy.The severity of clinical phenotypes in these adhalinopathies seems to relate more to the kind and size of the mutations than to the residual amount of the protein.We also detected a variable reduction in the laminin B1 subunit by immunohistochemistry in most patients,confirming that this is commonly associated with adhalin deficiency. |
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calf hypertrophy
creatine phosphokinase(CPK)elevated
dystrophin
muscle weakness,proximal
muscular dystrophy
muscular dystrophy,dystrophin normal
muscular dystrophy,female occurrence of
sarcoglycan
weakness,progressive
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