Unraveling the genetic control of diseases has important impact in disease prevention, diagnosis and therapy. Positional cloning is the main strategy for disease gene mapping. Despite advances in technology and increasing resources such as semi-automated genotyping instruments and dense maps of genetic markers, gene mapping remains a difficult task. Recently, we have developed an alternative gene mapping method that does not require genotyping. Instead gene regions are isolated by genome screens for shared genomic segments between individuals affected with the disease of interest. The isolated DNA fragments are then mapped by hybridization onto a genomic microarray. We call this method direct identical by descent (IBD) mapping. It is a combination of two techniques: genomic mismatch scanning and DNA microarrays. We have shown that direct IBD mapping is feasible on one chromosome by mapping the gene for congenital hyperinsulinism. The goal of this proposal is to expand this result by accomplishing the following aims. 1. To generate a whole genome DNA microarray for gene mapping, a """"""""genome on a chip"""""""". 2. To test genome wide IBD mapping in CEPH grandparent-grandchild pairs. 3. To develop statistical methods for the analysis of data derived from direct IBD mapping. Development of direct IBD mapping should provide a gene mapping method that is less labor-intensive and more efficient than the current methods. We expect that it can be applied as a tool for genome wide linkage disequilibrium analysis and affected relative pair mapping.

Agency
National Institute of Health (NIH)
Institute
National Human Genome Research Institute (NHGRI)
Type
Research Project (R01)
Project #
5R01HG001880-03
Application #
6343265
Study Section
Genome Study Section (GNM)
Program Officer
Brooks, Lisa
Project Start
1999-01-01
Project End
2003-12-31
Budget Start
2001-01-01
Budget End
2001-12-31
Support Year
3
Fiscal Year
2001
Total Cost
$281,147
Indirect Cost
Name
Children's Hospital of Philadelphia
Department
Type
DUNS #
073757627
City
Philadelphia
State
PA
Country
United States
Zip Code
19104
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