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A mouse model for hereditary hemorrhagic telangiectasia (HHT) type 2
Sudha Srinivasan1, Martha A Hanes, Tayeashai Dickens
1Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, NC 27710, USA.
Human Molecular Genetics
|February 18, 2003
Summary
Mice with a mutation in the Acvrl1 gene develop vascular lesions similar to Hereditary Hemorrhagic Telangiectasia type 2. This Acvrl1(+/-) mouse model is valuable for studying HHT progression and identifying contributing factors.
Area of Science:
- Genetics
- Vascular Biology
- Animal Models
Background:
- Hereditary Hemorrhagic Telangiectasia (HHT) is an autosomal-dominant disorder.
- HHT type 2 results from loss-of-function mutations in ACVRL1 (ALK1).
- Factors initiating HHT lesion formation and progression are unknown.
Purpose of the Study:
- To investigate if heterozygous Acvrl1-deficient mice serve as a suitable model for HHT type 2.
- To characterize the phenotype of Acvrl1(+/-) mice.
Main Methods:
- Generation of Acvrl1(+/-) mice.
- Phenotypic analysis of vascular lesions in various organs.
- Histopathological examination of lesions.
- Assessment of gastrointestinal bleeding and secondary cardiac phenotype.
Main Results:
- Acvrl1(+/-) mice developed age-dependent vascular lesions in multiple organs, mirroring HHT patient pathology.
- Lesions showed thin-walled dilated vessels, hemorrhage, and fibrosis.
- Mice exhibited gastrointestinal bleeding and a secondary cardiac phenotype.
Conclusions:
- Acvrl1(+/-) mice represent an appropriate animal model for HHT type 2.
- This model can aid in identifying genetic and environmental factors contributing to HHT type 2.
- Studies with this model will elucidate the role of ALK1 in adult vascular maintenance.