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Updated: Jul 6, 2026
07:35
Determining Bile Duct Density in the Mouse Liver
Published on: April 30, 2019
Notch signaling regulates bile duct morphogenesis in mice
Julie Lozier1, Brent McCright, Thomas Gridley
1The Jackson Laboratory, Bar Harbor, Maine, United States of America.
Plos One
|March 28, 2008
Summary
Alagille syndrome, caused by Jagged1 (JAG1) gene mutations, leads to bile duct paucity. This study shows that defects in bile duct formation, not cell differentiation, cause this condition in Notch pathway mutants.
Area of Science:
- Developmental Biology
- Genetics
- Hepatology
Background:
- Alagille syndrome is a genetic developmental disorder primarily caused by mutations in the Jagged1 (JAG1) gene.
- A key feature of Alagille syndrome is intrahepatic bile duct paucity.
- Jag1/Notch2 double heterozygous mice serve as a model for Alagille syndrome, but the underlying mechanism of bile duct paucity was unclear.
Purpose of the Study:
- To investigate embryonic biliary tract formation in a Jag1/Notch2 double heterozygous mouse model of Alagille syndrome.
- To further elucidate the role of the Notch pathway in bile duct development.
- To differentiate between impaired cell differentiation and defective morphogenesis as causes of bile duct paucity.
Main Methods:
- Characterization of embryonic biliary tract development in Jag1/Notch2 double heterozygous mice.
- Generation and analysis of a liver-specific Notch2 deletion mouse model.
Main Results:
- Embryonic biliary tract formation was analyzed in Jag1/Notch2 double heterozygous mice.
- A novel mouse model with liver-specific Notch2 deletion was created to study bile duct paucity.
- The study focused on understanding the cellular and developmental processes leading to bile duct abnormalities.
Conclusions:
- Bile duct paucity in Notch pathway loss-of-function mutant mice arises from defects in bile duct morphogenesis.
- The findings suggest that the Notch pathway is crucial for the proper structural development of bile ducts.
- This research clarifies the mechanism behind bile duct paucity in Alagille syndrome models.
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The Notch gene came into the limelight in 1914 after the discovery that its mutation in Drosophila melanogaster leads to a serrated (or "notched") wing margin phenotype. It was not until 1985...
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The Notch gene came into the limelight in 1914 after the discovery that its mutation in Drosophila melanogaster leads to a serrated (or "notched") wing margin phenotype. It was not until 1985...
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