Direct sequencing of exons 3 to 35 and the exon–intron boundaries of the CACNA1H gene was conducted in 118 childhood absence epilepsy patients of Han ethnicity recruited from North China. Sixty-eight variations have been detected in the CACNA1H gene, and among the variations identified, 12 were missense mutations and found only in 14 of the 118 patients in a heterozygous state, but not in any o...