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Reduced endothelin-3 expression in sporadic Hirschsprung disease
S E Kenny1, R M Hofstra, C H Buys
1Departments of Child Health, Preclinical Veterinary Sciences, and Human Anatomy and Cell Biology, University of Liverpool, Liverpool, UK.
The British Journal of Surgery
|May 3, 2000
Summary
Hirschsprung disease, a condition causing enteric aganglionosis, may stem from reduced endothelin-3 (EDN3) gene expression, even without direct mutations. This downregulation in EDN3 mRNA levels suggests a common pathway to aganglionosis in sporadic cases.
Area of Science:
- Genetics
- Developmental Biology
- Gastroenterology
Background:
- Hirschsprung disease (HSCR) is characterized by enteric aganglionosis, often linked to endothelin-3 (EDN3) and endothelin B receptor (EDNRB) gene mutations.
- However, most sporadic HSCR cases lack these mutations, suggesting alternative regulatory mechanisms.
- The study investigates gene expression levels in sporadic HSCR to understand the underlying pathology.
Purpose of the Study:
- To determine the messenger RNA (mRNA) levels of EDN3 and EDNRB in tissue samples from patients with sporadic Hirschsprung disease.
- To explore the role of gene expression, rather than mutation, in the pathogenesis of HSCR.
Main Methods:
- RNA and DNA were extracted from ganglionic and aganglionic colonic segments of ten children with sporadic HSCR and ten controls.
- DNA analysis screened for mutations in EDN3 and EDNRB genes.
- Semi-quantitative transcriptase-polymerase chain reaction (RT-PCR) assessed relative EDN3 and EDNRB mRNA levels.
Main Results:
- Sequence variants in EDN3 and EDNRB were identified in three patients.
- EDN3 mRNA levels were significantly reduced in both ganglionic and aganglionic colon of the remaining seven patients compared to controls.
- No significant difference in EDNRB mRNA expression was observed between HSCR patients and controls.
Conclusions:
- Downregulation of EDN3 mRNA is observed in sporadic short-segment Hirschsprung disease, even in the absence of mutations.
- This suggests that reduced EDN3 expression is a potential common mechanism leading to enteric aganglionosis in HSCR.
- The findings highlight the importance of gene expression regulation in HSCR pathogenesis.