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Hemoglobin Southampton (Casper): characterization of the base mutation
1Department of Pathology, University of Vermont, College of Medicine, Burlington 05405.
American Journal of Hematology
|January 1, 1989
Summary
Hemoglobin Casper, a genetic variant, arises from a specific DNA base change in the beta globin gene. This mutation creates a unique Msp I restriction site, aiding in its molecular identification.
Area of Science:
- Molecular Biology
- Genetics
- Biochemistry
Background:
- Hemoglobinopathies represent a significant global health burden.
- Accurate molecular diagnosis is crucial for understanding hemoglobin variants.
- Hemoglobin Casper is a rare beta globin gene variant.
Purpose of the Study:
- To characterize the molecular basis of Hemoglobin Casper.
- To identify a diagnostic molecular marker for Hemoglobin Casper.
Main Methods:
- DNA sequencing of the beta globin gene.
- Restriction fragment length polymorphism (RFLP) analysis using Msp I and Hpa II enzymes.
- Analysis of DNA methylation patterns.
Main Results:
- Identified a thymidine to cytidine substitution at codon 106 of the beta globin gene in Hemoglobin Casper.
- This mutation creates a novel Msp I restriction site, absent with Hpa II digestion.
- A 9.9-kb fragment specific to Msp I digestion confirmed the mutation and indicated CpG methylation.
Conclusions:
- The molecular basis of Hemoglobin Casper has been elucidated.
- Msp I RFLP analysis provides a reliable method for detecting Hemoglobin Casper.
- The presence of methylation at the CpG site offers insights into gene regulation.