ABCB4 p.Arg595*
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[hide] Two novel mutations in African and Asian children ... Dig Liver Dis. 2011 Jul;43(7):567-70. Epub 2011 Apr 21. Giovannoni I, Santorelli FM, Candusso M, Di Rocco M, Bellacchio E, Callea F, Francalanci P
Two novel mutations in African and Asian children with progressive familial intrahepatic cholestasis type 3.
Dig Liver Dis. 2011 Jul;43(7):567-70. Epub 2011 Apr 21., [PMID:21514256]
Abstract [show]
BACKGROUND: Defects in ABCB4 have been found to cause progressive familial intrahepatic cholestasis type 3. Liver histology is important, but not specific, for diagnosis. Genotyping is conclusive. AIM: To determine the pathogenetic role of two novel ABCB4 mutations in two unrelated children from North Africa and South Asia. METHODS: In both children liver histology showed extensive ductular reaction with portal and periportal fibrosis. Immunohistochemical analysis displayed absence of MDR3 protein expression at the canalicular pole. Genotype analysis was performed. RESULTS: Genotyping revealed two novel mutations in ABCB4: the c.1783 C>T (p.R595X) mutation in exon 15 was detected in compound heterozygosity with the c.937_992 in/del in exon 9 in one case, whereas the homozygous p.R595X mutation was recognized in the second child. CONCLUSIONS: Two novel loss-of-function mutations have been identified. Progressive familial intrahepatic cholestasis type 3 has a worldwide distribution and genetic analyses are conclusive for correct diagnosis.
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No. Sentence Comment
7 Results: Genotyping revealed two novel mutations in ABCB4: the c.1783 C > T (p.R595X) mutation in exon 15 was detected in compound heterozygosity with the c.937 992 in/del in exon 9 in one case, whereas the homozygous p.R595X mutation was recognized in the second child.
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ABCB4 p.Arg595* 21514256:7:79
status: NEWX
ABCB4 p.Arg595* 21514256:7:220
status: NEW51 We detected the c.1783 C > T (p.R595X) mutation in exon 15 in compound heterozygosity with the c.937 942delGCACTG/ins55 (p.A313MfsX72) in exon 9 (Fig. 2).
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ABCB4 p.Arg595* 21514256:51:32
status: NEW63 (B) Electropherogram of the heterozygous p.R595X mutation in ABCB4.
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ABCB4 p.Arg595* 21514256:63:43
status: NEW68 Shown is the model of the structure of ABCB4 protein (wild type) and of proteins truncated at amino acid positions 595 and 313, corresponding respectively to the variants p.R595X and c.937 992 in/del (for this latter variant, the model does not include the random 72 residues after amino acid 312).
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ABCB4 p.Arg595* 21514256:68:173
status: NEW71 Combination of d-HPLC and direct ABCB4 gene sequencing detected the homozygous p.R595X mutation.
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ABCB4 p.Arg595* 21514256:71:81
status: NEW