Phenotype-Genotype Correlation of North Indian Progressive Familial Intrahepatic Cholestasis type2 Children Shows p.Val444Ala and p.Asn591Ser Variants and Retained BSEP Expression

Fetal Pediatr Pathol. 2020 Apr;39(2):107-123. doi: 10.1080/15513815.2019.1641860. Epub 2019 Jul 23.

Abstract

Backgrounds and Aims: Progressive familial intrahepatic cholestasis type 2 (PFIC2) is caused by a defect or deficiency of bile salt export protein (BSEP) due to mutation in the ABCB11 gene. We intend to evaluate the phenotype-genotype correlation in 10 diagnosed cases of PFIC2 in a single tertiary care center in North India. Methods: The clinical, biochemical, histopathological, immunohistochemical, ultrastructural and genetic data of the 10 diagnosed cases of PFIC2 were recorded. Results: Icterus, pruritus and bleeding manifestations were the commonest clinical symptoms. Giant cell transformation was seen in 50% of the patients. Two predominant genetic variants were ABCB11 missense p.Val444Ala (c. 1331 T > C) and ABCB11 missense p.Asn591Ser (c. 1772 A > G) in their homozygous or compound heterozygous states and were associated with retained BSEP immunopositivity and reduced but retained BSEP immunopositivity respectively. Conclusion: Retention of BSEP is common in North Indian children of PFIC2 with no phenotype-genotype correlation.

MeSH terms

  • ATP Binding Cassette Transporter, Subfamily B, Member 11 / genetics*
  • ATP-Binding Cassette Transporters / genetics
  • Child
  • Cholestasis, Intrahepatic / genetics*
  • Female
  • Genetic Association Studies
  • Genotype*
  • Homozygote
  • Humans
  • India
  • Male
  • Mutation / genetics
  • Phenotype*

Substances

  • ABCB11 protein, human
  • ATP Binding Cassette Transporter, Subfamily B, Member 11
  • ATP-Binding Cassette Transporters

Supplementary concepts

  • Cholestasis, progressive familial intrahepatic 2