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Case Reports
Journal Article
A Chinese girl molecularly diagnosed with Alagille syndrome.
World Journal of Pediatrics : WJP 2010 August
BACKGROUND: Alagille syndrome (AGS) is a rare or fatal disease affecting multiple systems including the liver, heart, eyes, skeleton and face. It has been considered a genetically heterogeneous disorder of the Notch signaling pathway.
METHODS: A 28-month-old Chinese girl with congenital heart disease and jaundice was diagnosed with Alagille syndrome by liver biopsy showing a paucity of the intrahepatic bile ducts. Variants of the JAG1 gene were detected by DNA sequencing in the patient and her unaffected father.
RESULTS: A heterozygous missense mutation was identified in exon 2 of the JAG1 gene in the proband but not in exon 2, 4, 6, 9, 17, 23, 24 by DNA sequencing in her father. The mutation G-->T change was seen at position 133 in the cDNA sequence (c.133 G-->T), causing a substitution of a leucine for a valine (V45L) residue in the N terminus between signal peptide and DSL domain of the Notch ligand. This mutation, however, was absent in her father.
CONCLUSION: Genes in the Notch signaling pathway should be further studied in AGS, and used to confirm clinical or prenatal diagnosis and facilitate genetic counseling.
METHODS: A 28-month-old Chinese girl with congenital heart disease and jaundice was diagnosed with Alagille syndrome by liver biopsy showing a paucity of the intrahepatic bile ducts. Variants of the JAG1 gene were detected by DNA sequencing in the patient and her unaffected father.
RESULTS: A heterozygous missense mutation was identified in exon 2 of the JAG1 gene in the proband but not in exon 2, 4, 6, 9, 17, 23, 24 by DNA sequencing in her father. The mutation G-->T change was seen at position 133 in the cDNA sequence (c.133 G-->T), causing a substitution of a leucine for a valine (V45L) residue in the N terminus between signal peptide and DSL domain of the Notch ligand. This mutation, however, was absent in her father.
CONCLUSION: Genes in the Notch signaling pathway should be further studied in AGS, and used to confirm clinical or prenatal diagnosis and facilitate genetic counseling.
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