RESUMO
<p><b>OBJECTIVE</b>To investigate the gene mutation in one sporadic case of bullous congenital ichthyosiform erythroderma (BCIE), and to explore the relationship between the genotype and phenotype.</p><p><b>METHODS</b>DNA was extracted from the blood samples of the patient with BCIE, unaffected members of the pedigree, and 50 unrelated healthy controls. PCR was used to amplify the hot spot fragment of keratin 1 (KRT1) and keratin 10 (KRT10) gene. The PCR products were directly sequenced to detect the mutations.</p><p><b>RESULTS</b>A heterozygous 467G>A mutation was found in the patient, resulting in the substitution of arginine (R) by histidine (H) in codon 156 (R156H) in the 1A domain of the KRT10 protein but not in the healthy individuals from the family and the 50 unrelated individuals.</p><p><b>CONCLUSION</b>The mutation of 467G>A in exon 1 of KRT10 gene identified may play a major role in the pathogenic mechanism of this case of BCIE.</p>