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The high mobility group I-C gene (HMGI-C): polymorphism and genetic localization
C S Ishwad1, M D Shriver, D M Lassige
1Department of Human Genetics, Graduate School of Public Health, University of Pittsburgh, PA 15261, USA.
Human Genetics
|January 1, 1997
Summary
Researchers found a variable (CT) dinucleotide repeat in the human HMGI-C gene
Area of Science:
- Genetics
- Molecular Biology
- Human Genome Research
Background:
- The human high mobility group I-C (HMGI-C) gene plays a role in DNA architecture and gene regulation.
- Understanding genetic variations within gene regulatory regions is crucial for human genetics research.
Purpose of the Study:
- To identify and characterize polymorphisms in the 5'-flanking region of the HMGI-C gene.
- To assess the heterozygosity and utility of identified polymorphisms for genetic studies.
Main Methods:
- Dinucleotide repeat analysis in the 5'-flanking region of the HMGI-C gene.
- Heterozygosity assessment in diverse populations (African Americans and Caucasians).
- Linkage analysis using CEPH pedigrees and established genetic markers.
Main Results:
- A highly informative dinucleotide repeat polymorphism, consisting of 18-37 (CT) copies, was identified.
- Observed heterozygosity for this polymorphism is high (82-83%) in both African American and Caucasian populations.
- Linkage analysis mapped the HMGI-C gene to chromosome region 12q13-15, with tight linkage to markers D12S102 and D12S8.
Conclusions:
- The identified (CT) dinucleotide repeat is a valuable genetic marker for the HMGI-C gene.
- This polymorphism exhibits high heterozygosity, making it useful for population genetics and linkage studies.
- The HMGI-C gene's location on chromosome 12q13-15 is confirmed through tight linkage analysis.