Eight common (>0.5%) polymorphisms of SCN5A have been described in the US population. Every human also continuously generates two wild-type (WT) splice variants, one with a glutamine residue at position 1077 (Q1077) and one lacking this glutamine (Q1077del). One polymorphism (H558R) has been studied in both splice variants, five polymorphisms (R34C, R481W, S524Y, P1090L,V1951L) have not been previously studied, and two polymorphisms (S1103Y and R1193Q) have been studied in only one of the two splice variants.
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