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Intravital Imaging of Intraepithelial Lymphocytes in Murine Small Intestine
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Towards understanding microvillus inclusion disease.
Georg F Vogel1,2,3, Michael W Hess4, Kristian Pfaller4
1Department of Paediatrics I, Medical University of Innsbruck, Anichstrasse 35, 6020, Innsbruck, Austria. georg.vogel@i-med.ac.at.
Molecular and Cellular Pediatrics
|February 3, 2016
Summary
Microvillus inclusion disease (MVID) causes severe infant diarrhea due to genetic defects. Mutations in MYO5B and STX3 disrupt protein transport, affecting intestinal cell structure and function.
Area of Science:
- Gastroenterology
- Genetics
- Cell Biology
Background:
- Microvillus inclusion disease (MVID) presents as severe, intractable watery diarrhea in infants.
- Diagnosis is confirmed by electron microscopy showing absent/shortened microvilli and characteristic inclusions in enterocytes.
Purpose of the Study:
- To investigate the genetic basis of MVID beyond MYO5B mutations.
- To identify novel genetic factors contributing to MVID pathogenesis.
Main Methods:
- Whole-exome sequencing was performed on DNA from two MVID patients.
- Analysis focused on identifying causative mutations in genes involved in protein trafficking.
Main Results:
- Homozygous truncating mutations in STX3 were identified in two MVID patients.
- This suggests STX3 mutations are a cause of MVID.
- Mutations in MYO5B and STX3 disrupt apical vesicle trafficking in enterocytes.
Conclusions:
- Disturbed delivery of brush border membrane proteins is a common defect in MVID.
- STX3 is a newly identified gene associated with MVID, expanding the genetic landscape of this disease.
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