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MSH: A form of long QT syndrome that is associated with congenital deafness. It is characterized by abnormal cardioelectrophysiology involving the VOLTAGE-GATED POTASSIUM CHANNEL. It results from mutation of KCNQ1 gene (Subtype 1 or JLN1) or the KCNE1 gene (Subtype 2 or JLN2).,NCI: An autosomal recessive inherited syndrome caused by mutations in the KCNE1 and KCNQ1 genes. It is characterized by congenital hearing loss and arrhythmia. It is a form of long QT syndrome.
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