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Case Report



Novel Variant ATP8B1 mutation in a child with progressive familial intrahepatic cholestasis (type 1)

Nida Mirza, Ravi Bharadwaj, Smita Malhotra, Anupam Sibal.

Abstract
Background: Progressive familial intrahepatic cholestasis (PFIC) is a group of heterogeneous autosomal recessive disorders attributed to hepatocellular cholestasis, characterized by low serum γ-glutamyl transferase (GGT) levels due to mutation in ATP8B1.
Case Presentation: We present a case of 2-year-old male child who experienced persistent marked pruritus, jaundice, and failure to thrive since 3 months of age. He was diagnosed as PFIC on the basis of histology, biochemical, and clinical finding. On genetic analysis by next generation sequencing, a novel homozygous missense variation in exon 19 of the ATP8B1 gene [chr18:g.55335672C>T; Depth: 71x] resulting in the amino acid substitution of Glutamic acid for Glycine at codon 733 [p.Gly733Glu;ENST00000536015.1], which was confirmed by sanger sequencing of parents.
Conclusion: We report a case of PFIC type 1 with a novel homozygous missense variation in exon 19 of the ATP8B1 gene with both mother and father as heterozygous carrier. Further confirmation of this variant in ATP8B1 mutation will occur by identification of similar phenotypes with similar mutation.

Key words: Liver disease, case report, novel mutation, progressive familial intrahepatic cholestasis


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