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Twelve novel JAG1 gene mutations in polish Alagille syndrome patients

✍ Scribed by Dorota Jurkiewicz; Ewa Popowska; Christiane Gläser; Ingo Hansmann; Małgorzata Krajewska-Walasek


Publisher
John Wiley and Sons
Year
2005
Tongue
English
Weight
119 KB
Volume
25
Category
Article
ISSN
1059-7794

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✦ Synopsis


Communicated by Mark H. Paalman Alagille syndrome (AGS) is an autosomal dominant disorder with developmental abnormalities of the liver, heart, eyes, vertebrae, and face. Mutations in the JAG1 (Jagged 1) gene, coding a ligand in the evolutionarily conserved Notch signaling pathway, are responsible for AGS. Here we present sixteen different JAG1 gene mutations, among them twelve novel, not described previously. Seven frameshift: c. 172_178del7 (p.Ala58fs), c.509delT (p.Leu170fs), c.1197delG (p.Val399fs), c.1485_1486delCT (p.Pro495fs), c.1809_1810insTGGG (p.Lys604fs), c.2122_2125delCAGT (p.Gln708fs), c.2753delT (p.Ile918fs); five nonsense: c.383G>A (p.Trp128X), c.496C>T (p.Glu166X), c.841C>T (p.Gln281X), c.1207C>T (p.Gln403X), c.1603C>T (p.Gln535X); two splice site: c.388-1G>C, c.3048+1_3048+2insG and two missense mutations: c.359T>A (p.Ile120Asn), c.560G>A (p.Cys187Tyr) were found. Forty percent of the changes were identified in exons 2 and 4, the remaining mutations are distributed along the entire coding sequence of the gene. Seventyfive percent of the mutations lead to creation of premature termination codons. Family studies revealed that the specific mutations were inherited in 3 out of 11 investigated cases. No correlation between genotype and phenotype was observed.


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