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Linkage-disequilibrium mapping without genotyping
V G Cheung1, J P Gregg, K J Gogolin-Ewens
1Department of Pediatrics, The Children's Hospital of Philadelphia, Pennsylvania 19104, USA. vcheung@mail.med.upenn.edu
Nature Genetics
|March 21, 1998
Summary
Genomic mismatch scanning (GMS) successfully mapped the congenital hyperinsulinism (HI) gene without genotyping. This linkage-disequilibrium mapping technique identified the HI gene within a 2-megabase region on chromosome 11.
Area of Science:
- Genetics
- Genomic analysis
- Disease gene mapping
Background:
- Congenital hyperinsulinism (HI) is an autosomal recessive disorder.
- A founder effect in Ashkenazi Jewish populations suggests a specific gene.
- Previous methods required genotyping or sequencing for gene identification.
Purpose of the Study:
- To demonstrate the feasibility and efficacy of Genomic Mismatch Scanning (GMS) for linkage-disequilibrium mapping.
- To map the gene responsible for congenital hyperinsulinism (HI).
- To validate GMS as a genotyping-free gene mapping technique.
Main Methods:
- Genomic Mismatch Scanning (GMS) was employed to enrich for regions of identity by descent (IBD).
- IBD regions were mapped using DNA hybridization to a chromosome 11 microarray.
- The study focused on congenital hyperinsulinism in the Ashkenazi Jewish population.
Main Results:
- GMS successfully enriched for IBD regions relevant to the HI gene.
- The combination of GMS and microarray hybridization precisely mapped the HI gene.
- The responsible gene (SUR1) was localized to a 2-megabase region on chromosome 11p15.1.
Conclusions:
- Genomic Mismatch Scanning (GMS) is an effective linkage-disequilibrium mapping strategy.
- GMS enables gene mapping without the need for genotyping or sequencing.
- This technique accurately identified the congenital hyperinsulinism gene, demonstrating its utility in genetic research.