title: [Mutation analysis and prenatal diagnosis of keratin 9 gene in a large Chinese family with epidermolytic palmoplantar keratoderma].
abstract: OBJECTIVE
  To analyze potential mutation in keration 9 (KRT9) gene in a large Chinese family with epidermolytic palmoplantar keratoderma (EPPK) and to perform prenatal diagnosis on the fetus at 10th gestational week.
  
  
  METHODS
  Peripheral venous blood samples were obtained from 5 affected and 8 unaffected individuals of the family. Fifty unrelated healthy individuals were also recruited as controls. PCR was used to amplify exons 1 and 6 of KRT9 gene, and the products were sequenced directly. After the mutation was confirmed, prenatal diagnosis was performed on the fetus during the first trimester of pregnancy.
  
  
  RESULTS
  A heterozygous missense mutation c.482A to G in the KRT9 gene, which has led to substitution of Asparaginate by Serine at codon 161 (p.N161S), was detected in all patients but not in other individuals of the family and the 50 healthy controls. The fetus was found to have carried the p.N161S mutation too. Following selected abortion, analysis of fetal tissue was consistent with prenatal diagnosis.
  
  
  CONCLUSIONS
  The missense mutation c.482A to G (p.N161S), which has been shown previously to cause EPPK, is found in the KRT9 gene of patients in this family. Gene mutation analysis for prenatal diagnosis is efficient to facilitate detection of affected fetus in time.
authors: Prenatal Diagnosis Center, the First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan 450052, P.R.China. kongxd@263.net.
authors: Ning
authors: N
authors: Liu
authors: Huirong
authors: H
authors: Shi
authors: Xiangdong
authors: X
authors: Kong
authors: Qinghua
authors: Q
authors: Wu
authors: Miao
authors: M
authors: Jiang
mesh_terms: D000328:Adult; D044466:Asian People / Q000235:genetics*; D001483:Base Sequence; D004252:DNA Mutational Analysis / Q000379:methods; D006801:Humans; D053534:Keratin-9 / Q000235:genetics*; D053546:Keratoderma, Palmoplantar, Epidermolytic / Q000175:diagnosis* / Q000235:genetics*; D008969:Molecular Sequence Data; D020125:Mutation, Missense; D010375:Pedigree; D011296:Prenatal Diagnosis / Q000379:methods
chemical_list: C507440:KRT9 protein, human; D053534:Keratin-9