As in previous studies in cell culture, altered mRNA and/or the functional expression of a specific subunit of the sodium channel (SkM2) was found in biopsy sections of muscle from all 12 persons examined who were susceptible to malignant hyperthermia but in none of the 16 nonsusceptible participants. Human malignant hyperthermia is a heterogeneous disorder, and the down-regulation of SkM2 may be involved in the final common pathway through which mutations in any one of several proteins, including the ryanodine receptor, could render a person susceptible.
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