Related Experiment Videos
Identifying candidate Hirschsprung disease-associated RET variants
Grzegorz M Burzynski1, Ilja M Nolte, Agnes Bronda
1Department of Medical Genetics, University of Groningen, Groningen, The Netherlands.
American Journal of Human Genetics
|March 11, 2005
Summary
Researchers identified a specific genetic variant in the RET gene strongly associated with Hirschsprung disease (HSCR). This finding pinpoints a likely cause of HSCR, advancing understanding of this rare congenital condition.
Area of Science:
- Genetics
- Developmental Biology
- Pediatric Surgery
Background:
- Sporadic Hirschsprung disease (HSCR) is linked to increased allele sharing in the RET gene's 5' region.
- A previously identified six-SNP haplotype significantly increases HSCR risk, particularly in homozygous individuals.
Purpose of the Study:
- To precisely define the HSCR-associated region within the RET locus.
- To identify specific candidate variants contributing to HSCR development.
Main Methods:
- Sequencing of the RET gene's 5' region (33 kb) in homozygous HSCR patients and controls.
- Analysis of sequence differences in conserved regions and transcription factor binding sites.
- Genotyping of candidate variants and interspecies sequence conservation analysis.
Main Results:
- 86 sequence differences were identified between risk and non-risk haplotypes.
- Eight candidate variants were found in conserved regions; six showed strong disease association.
- One variant, conserved across mammalian and non-mammalian species, emerged as the most probable HSCR-associated variant.
Conclusions:
- A specific genetic variant within the RET locus is strongly implicated as a cause of sporadic Hirschsprung disease.
- This discovery refines the understanding of HSCR pathogenesis and provides a key target for future research.