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Taking over the Atlas
Dear Colleagues,
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Jean-Loup Huret jlhuret@AtlasGeneticsOncology.org
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Alagille syndrome (AGS)

Identity

Other namesAlagille-Watson syndrome (AWS)
Arteriohepatic dysplasia (AHD)
Cholestasis with peripheral pulmonary stenosis
Hepatic ductular paucity, syndromatic
Note syndrome associating 5 major features (complete syndrome) : paucity of interlobular bile ducts, pulmonary artery stenosis, butterfly-like vertebrae, posterior embryotoxon and a peculiar face. Only the 2 first ones are symptomatic. Incomplete syndrome is very frequent. Other features have been described involving kidney, cardiac and vascular anomalies including tetralogy of Fallot, ear, pancreas, intestine etc
Inheritance autosomal dominant with a highly variable expressivity and nearly complete penetrance ; frequency is about 1/70,000-100,000 live newborns ; 60-70% are sporadic cases.

Clinics

Phenotype and clinics
  • liver : jaundice, pruritus, xanthomas, bile duct paucity, biochemical cholestasis and hypercholesterolemia. Liver transplantation is performed in about 25% cases.
  • cardiovascular system : peripheral pulmonary stenosis, coarctation of aorta, tetralogy of Fallot, ventricular or atrial septal defects, patent ductus arteriosus, truncus arteriosus, right ventricule hypoplasia.
  • systemic vascular system: coarctation of aorta, middle aortic syndrome, arterial hypoplasia (hepatic, renal, carotid, celiac), moyamoya disease, hypoplastic portal vein branch, intracranial bleeding.
  • vertebrae and skeleton: butterfly-like vertebrae, spina bifida, abnormal progression of interpedicular distances, shortening of distal phalanges and metacarpal bones, clinodactily.
  • eye : posterior embryotoxon, retinal pigmentation, iris strands, cataract, myopia, strabismus, glaucoma, optic disc drusen, fundus hypopigmentation, blindness.
  • kidney : mesangiolipidosis, tubular dysfunction, tubulointerstitial nephritis, renal hypoplasia, renal agenesis, horseshoe kidney, cysts.
  • ear : temporal bone abnormalities, chronic otitis media, deafness.
  • larynx : high pitched voice.
  • pancreas : diabetes, exocrine pancreatic insufficiency.
  • gut : small bowell atresia or stenosis.
  • lung : tracheal and bronchial stenosis.
  • face : prominent forehead, deep-set eyes, mild hypertelorism, straight nose, small pointed chin.
  • growth retardation.
  • mental retardation (?).
    • Neoplastic risk very rare hepatocellular carcinoma
    Treatment no specific treatment
    Prognosis Major contributors to morbidity arise from bile duct paucity or cholestatic liver disease (including liver transplantation), cardiac disease, and renal disease.

    Cytogenetics

    Note 3-7% of patients with Alagille syndrome have deletions of part or totality of the JAG1 gene in 20p and, in rare instances translocations : del(20p), del(20)(p11.2), del(20)(p12.3-p11.23), del(20)(p13-p12.2), ins(7;20), t(2;20)

    Other findings

    Note There is no phenotype-genotype correlation

    Genes involved and Proteins

     
    Gene NameJAGGED1
    Location 20p12.1-11.23
    DNA/RNA
    Description The gene spans 36 kb on the short arm of chromosome 20. It contains 26 exons (size from 28 bp to 2 kb) and 25 introns (size from 89 bp to nearly 9 kb).
    Transcription JAG1 is transcribed from centromere to telomere. The 26 exons are coding ; exon 1 is coding on the last 81 bases, and exon 26 on the first 455 bases. The transcript size is 5.5 kb.
    Protein
    Description glycosylated transmembrane protein ; 1218 amino acids, predicted glycosylation sites: 960 ; 991 ; 1045 ; 1064.
    Expression very wide; in heart, arteries, kidney, lung, pancreas, skeletal muscle, central nervous system, limb bud, etc. during embryonic and fetal development ; in adult tissues ; in tumors
    Localisation transmembrane plasma protein
    Function ligand of the Notch membrane receptors
    Homology
  • serrate in D. melanogaster
  • lag-2 in C. elegans
  • jagged 1a and jagged 1b in zebrafish (D. rerio)
  • jagged2 ou serrateB in zebrafish (D. rerio)
  • X-serrate-1 in tadpole (Xenopus laevis)
  • C-serrate-1 and C-serrate-2 in chicken (Gallus gallus)
  • jagged1 and jagged2 in mouse (Mus musculus)
  • jagged1 and jagged2 in rat (Rattus norvegicus)
  • jagged1 and jagged2 in dog (Canis familiaris)
  • partial jagged1 in Bos taurus
  • JAGGED2 in Homo sapiens
    • Mutations
    Note 95% of mutations are intragenic mutations located in the part of the JAG1 gene encoding extracellular and transmembrane domains of the protein. They are point mutations or small deletions/insertions, leading to frame-shift mutations, premature stop codons, splice site mutations, and missense mutations.
    3-7% of mutations are deletions of part or totality of the JAG1 gene in 20p and, in rare instances translocations.
    Some AGS cases present with no mutation in the DNA of the 26 exons and exon boundaries of JAG1. In those instances, no prenatal diagnosis can be performed.
     
      Distribution of 344 intragenic JAG1 mutations in Alagille patients. We summarized all the mutations published so far and unpublished results from our laboratory and from A. Mantel (Hospital of Bicêtre). Seventy five per cent mutations (257/344) are different at the DNA level. Sequencing exons 2, 4, 6, 9, 17, 23, and 24 which correspond to 35% of cDNA, detect 53% of all mutations.
    The signal peptide is encoded by exon 1, and the DSL domain by part of exon 4, the 16 EGF-like repeats correspond to exons 5-21, the cysteine-rich region partially overlaps exons 22-24, and the transmembrane domain and the intracellular region are encoded by exon 26.
    Somatic Mosaicism has been reported.

    External links

    OrphanetAlagille syndrome
    AssociationThe Alagille syndrome alliance
    AssociationChildren's liver association for support services
    AssociationH\351pat\271enfants
    AssociationVerein Cholestase Erkrankter e.V.
    AssociationVerein leberkrankes Kind e.V.

    Bibliography

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    PMID 4712776
     
    Hepatic ductular hypoplasia associated with characteristic facies, vertebral malformations, retarded physical, mental, and sexual development, and cardiac murmur.
    Alagille D, Odiˆ®vre M, Gautier M, Dommergues JP
    The Journal of pediatrics. 1975 ; 86 (1) : 63-71.
    PMID 803282
     
    Syndromic paucity of interlobular bile ducts (Alagille syndrome or arteriohepatic dysplasia): review of 80 cases.
    Alagille D, Estrada A, Hadchouel M, Gautier M, Odiˆ®vre M, Dommergues JP
    The Journal of pediatrics. 1987 ; 110 (2) : 195-200.
    PMID 3806290
     
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    PMID 8071971
     
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    American journal of human genetics. 1994 ; 55 (2) : 238-243.
    PMID 8037203
     
    Alagille syndrome is caused by mutations in human Jagged1, which encodes a ligand for Notch1.
    Li L, Krantz ID, Deng Y, Genin A, Banta AB, Collins CC, Qi M, Trask BJ, Kuo WL, Cochran J, Costa T, Pierpont ME, Rand EB, Piccoli DA, Hood L, Spinner NB
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    Mutations in the human Jagged1 gene are responsible for Alagille syndrome.
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    Mutations in JAGGED1 gene are predominantly sporadic in Alagille syndrome.
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    Human ligands of the Notch receptor.
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    The American journal of pathology. 1999 ; 154 (3) : 785-794.
    PMID 10079256
     
    Jagged1 mutations in patients ascertained with isolated congenital heart defects.
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    PMID 11232356
     
    JAGGED1 gene expression during human embryogenesis elucidates the wide phenotypic spectrum of Alagille syndrome.
    Crosnier C, Attiˆ©-Bitach T, Encha-Razavi F, Audollent S, Soudy F, Hadchouel M, Meunier-Rotival M, Vekemans M
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    PMID 10978356
     
    Fifteen novel mutations in the JAGGED1 gene of patients with Alagille syndrome.
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    PMID 11139247
     
    Familial Tetralogy of Fallot caused by mutation in the jagged1 gene.
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    Human molecular genetics. 2001 ; 10 (2) : 163-169.
    PMID 11152664
     
    Parental mosaicism of JAG1 mutations in families with Alagille syndrome.
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    The DSL domain in mutant JAG1 ligand is essential for the severity of the liver defect in Alagille syndrome.
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    Familial deafness, congenital heart defects, and posterior embryotoxon caused by cysteine substitution in the first epidermal-growth-factor-like domain of jagged 1.
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    PMID 12022040
     
    Conditional JAG1 mutation shows the developing heart is more sensitive than developing liver to JAG1 dosage.
    Lu F, Morrissette JJ, Spinner NB
    American journal of human genetics. 2003 ; 72 (4) : 1065-1070.
    PMID 12649809
     
    Bleeding tendency in children with Alagille syndrome.
    Lykavieris P, Crosnier C, Trichet C, Meunier-Rotival M, Hadchouel M
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    PMID 12509572
     
    Identification of 36 novel Jagged1 (JAG1) mutations in patients with Alagille syndrome.
    Rˆpke A, Kujat A, Grˆ§ber M, Giannakudis J, Hansmann I
    Human mutation. 2003 ; 21 (1) : page 100.
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    Vascular anomalies in Alagille syndrome: a significant cause of morbidity and mortality.
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    Expression of mutant JAGGED1 alleles in patients with Alagille syndrome.
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    Twelve novel JAG1 gene mutations in Polish Alagille syndrome patients.
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    Human mutation. 2005 ; 25 (3) : page 321.
    PMID 15712272
     
    Hepatocellular carcinoma occurring in alagille syndrome.
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    REVIEW articlesautomatic search in PubMed
    Last year articlesautomatic search in PubMed

    Contributor(s)

    Written10-2005Michèle Meunier-Rotival, Michelle Hadchouel
    INSERM E0020 80 rue du General Leclerc, F-94276 Le Kremlin-Bicetre Cedex, France

    Citation

    This paper should be referenced as such :
    Meunier-Rotival, M ; Hadchouel, M
    Alagille syndrome (AGS)
    Atlas Genet Cytogenet Oncol Haematol. 2006;10(2):131-133.
    Free journal version : [ pdf ]   [ DOI ]
    URL : http://AtlasGeneticsOncology.org/Kprones/AlagilleID10090.html

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    indexed on : Tue Feb 17 19:40:58 CET 2015

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