Clinical trial NCT00001642: Positional Cloning of the Gene(s) Responsible for Alagille Syndrome
Official title: Positional Cloning of the Gene(s) Responsible for Alagille Syndrome
Study type: OBSERVATIONAL
Overall status: COMPLETED
Conditions: Alagille Syndrome
Keywords: Chromosomal Deletion
Mutations
Paucity of Bile Ducts
Physical Map
Transcript Identification
Alagille Syndrome
Syndromic Bile Duct Paucity
Lead sponsor: National Institutes of Health Clinical Center (CC)
Sponsor class: NIH
First posted: 2002-12-10
Enrollment: 225
Sex: ALL
Standard ages: CHILD
ADULT
OLDER_ADULT
Accepts healthy volunteers: no

Brief summary: The goal of the project is to identify and clone the gene(s) responsible for the Alagille Syndrome (AGS) by a positional cloning approach. The first step towards this goal is to define the smallest genomic candidate region for AGS at 20p12 and to begin to identify genes within this region which are, by definition, candidate genes for the disease. In a collaborative effort with clinician-investigators studying the Alagille syndrome, metaphase chromosomes and genomic DNA from affected individuals will be studied for subchromosomal deletions and for mutations in the candidate genes. Characterization of genes involved in Alagille syndrome could provide important insight into the pathophysiology of the disease, the development of normal liver and treatment of this disease. Recently, we and others found that mutations in Jagged1, a Notch1 receptor are responsible for Alagille Syndrome.

Detailed description: The goal of the project is to identify and clone the gene(s) responsible for the Alagille Syndrome (AGS) by a positional cloning approach. The first step towards this goal is to define the smallest genomic candidate region for AGS at 20p12 and to begin to identify genes within this region which are, by definition, candidate genes for the disease. In a collaborative effort with clinician-investigators studying the Alagille syndrome, metaphase chromosomes and genomic DNA from affected individuals will be studied for subchromosomal deletions and for mutations in the candidate genes. Characterization of genes involved in Alagille syndrome could provide important insight into the pathophysiology of the disease, the development of normal liver and treatment of this disease.

Eligibility criteria: All enrolled affected subjects, whose samples will be analyzed in this study, must meet the criteria for the clinical diagnosis of Alagille Syndrome (Syndromic Bile Duct Paucity) which include liver biopsy findings consistent with Alagille Syndrome and at least 3 of the 5 primary clinical criteria: cholestasis, characteristic face, posterior embryotoxon, "butterfly" vertebrae and cardiac findings.

Primary outcomes:
Secondary outcomes:
Other outcomes:
Locations:
city: Bethesda
country: United States
facility: National Human Genome Research Institute (NHGRI)
state: Maryland
Study officials:
References:
citation: Alagille D, Odievre M, Gautier M, Dommergues JP. Hepatic ductular hypoplasia associated with characteristic facies, vertebral malformations, retarded physical, mental, and sexual development, and cardiac murmur. J Pediatr. 1975 Jan;86(1):63-71. doi: 10.1016/s0022-3476(75)80706-2.
citation: Alagille D, Estrada A, Hadchouel M, Gautier M, Odievre M, Dommergues JP. Syndromic paucity of interlobular bile ducts (Alagille syndrome or arteriohepatic dysplasia): review of 80 cases. J Pediatr. 1987 Feb;110(2):195-200. doi: 10.1016/s0022-3476(87)80153-1.
citation: Oda T, Elkahloun AG, Pike BL, Okajima K, Krantz ID, Genin A, Piccoli DA, Meltzer PS, Spinner NB, Collins FS, Chandrasekharappa SC. Mutations in the human Jagged1 gene are responsible for Alagille syndrome. Nat Genet. 1997 Jul;16(3):235-42. doi: 10.1038/ng0797-235.