Related Experiment Video
Updated: May 21, 2026
08:14
Hepatocyte-specific Ablation in Zebrafish to Study Biliary-driven Liver Regeneration
Published on: May 20, 2015
HNF1B deficiency causes ciliary defects in human cholangiocytes
Philip Roelandt1, Aline Antoniou, Louis Libbrecht
1Hepatology Department, University Hospitals Leuven, Belgium.
Hepatology (Baltimore, Md.)
|June 19, 2012
Summary
Heterozygous HNF1B deficiency in humans is linked to ciliary anomalies in bile ducts, potentially causing cholestasis. This contrasts with mouse models, highlighting unique human hepatic consequences.
Area of Science:
- Genetics
- Hepatology
- Developmental Biology
Background:
- Hepatocyte nuclear factor 1 homeobox B (HNF1B/TCF2) mutations cause renal cyst and diabetes syndrome.
- While mouse studies show liver defects in Hnf1β deficiency, human hepatic consequences are poorly understood.
Observation:
- Three patients with heterozygous HNF1B deficiency exhibited normal bile duct imaging and histology.
- Electron microscopy revealed absent or reduced primary cilia in cholangiocytes of these patients.
Findings:
- Heterozygous HNF1B deficiency is associated with ciliary abnormalities in human cholangiocytes.
- These ciliary defects may underlie cholestasis in individuals with HNF1B deficiency.
Implications:
- Reveals a novel mechanism for cholestasis linked to HNF1B mutations.
- Suggests primary cilia dysfunction as a key factor in HNF1B-associated liver disease.
- Highlights the importance of investigating ciliary function in genetic liver disorders.
Related Concept Videos
01:23Cystic Fibrosis: Pathogenesis
Cystic fibrosis (CF), an autosomal recessive disorder, significantly affects the function of exocrine glands. This genetically inherited disease is characterized by the production of thick and sticky mucus, which can severely affect various organs and systems in the body.
CF is primarily caused by a genetic mutation in a chromosome 7 gene coding for the cystic fibrosis transmembrane conductance regulator (CFTR) protein. The most common gene mutation leading to CF is the ΔF508 mutation, but...
CF is primarily caused by a genetic mutation in a chromosome 7 gene coding for the cystic fibrosis transmembrane conductance regulator (CFTR) protein. The most common gene mutation leading to CF is the ΔF508 mutation, but...
01:22Microtubules in Signaling
The primary cilium, made up of microtubules, acts as antennae on the cell surfaces for relaying external stimuli into the cells. These fine hair-like structures are present, generally one per cell. These are non-motile cilia in a 9+0 microtubules arrangement, where the central pair of microtubules are absent. The primary cilia arise from the basal body embedded in the cell membrane. Intraflagellar transport (IFT) carries requisite proteins from the cytoplasm to the cilium because the primary...
03:14Notch Signaling Pathway
The Notch signaling pathway is a major intracellular signaling pathway that is highly conserved over a broad spectrum of metazoan species. It stands unique from other intracellular signaling mechanisms in animals because notch protein itself acts as the receptor as well as the primary signaling molecule.
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...
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...
01:23Cirrhosis I: Introduction
Cirrhosis is a chronic, irreversible liver disease characterized by the widespread replacement of healthy liver tissue with fibrotic scar tissue and the formation of regenerative nodules.Etiology of cirrhosisCirrhosis results from sustained liver injury that triggers progressive fibrosis and structural remodeling. The underlying causes are diverse, encompassing common and less frequent clinical conditions. Regardless of the origin, all causes lead to chronic inflammation, hepatocyte loss, and...