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Jagged1 mutations in alagille syndrome
N B Spinner1, R P Colliton, C Crosnier
1Division of Human Genetics, Department of Pediatrics, The Children's Hospital of Philadelphia and University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania, USA.
Human Mutation
|January 4, 2001
Summary
Alagille syndrome is often caused by mutations in the Jagged1 (JAG1) gene. Most mutations result in a non-functional JAG1 protein, suggesting haploinsufficiency as the primary disease mechanism.
Area of Science:
- Genetics
- Molecular Biology
- Pediatric Medicine
Background:
- Alagille syndrome is a genetic disorder affecting multiple organs.
- Mutations in the Jagged1 (JAG1) gene are implicated in Alagille syndrome.
- Understanding the spectrum of JAG1 mutations is crucial for diagnosis and management.
Purpose of the Study:
- To comprehensively review and analyze reported Jagged1 (JAG1) gene mutations in Alagille syndrome patients.
- To characterize the types and frequencies of JAG1 mutations in a large cohort.
- To elucidate the mutational mechanisms underlying Alagille syndrome.
Main Methods:
- Systematic review of published data on 233 Alagille syndrome patients with JAG1 mutations.
- Analysis of mutation types including frameshifts, deletions, missense mutations, and splicing variants.
- Assessment of mutation frequency and distribution within the JAG1 gene.
Main Results:
- Mutations in JAG1 were identified in 60-75% of clinically diagnosed Alagille syndrome patients.
- Frameshift mutations causing premature termination codons were most common (72%).
- De novo mutations accounted for a high proportion (60-70%) of cases.
Conclusions:
- The wide spectrum of JAG1 mutations supports haploinsufficiency as the key mechanism in Alagille syndrome.
- JAG1 mutations are the primary genetic cause of Alagille syndrome.
- Further research into genotype-phenotype correlations is warranted.