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Application of denaturing gradient gel electrophoresis to detect DNA sequence differences encoding apolipoprotein E
S Parker1, M C Angelico, L Laffel
1Epidemiology and Genetics Section, Joslin Diabetes Center, Boston, Massachusetts 02215.
Genomics
|April 1, 1993
Summary
This study introduces a novel DNA-based method to identify apolipoprotein E (apoE) isoforms. This PCR-DGGE technique offers a more reliable alternative to traditional protein analysis for apoE genotyping.
Area of Science:
- Biochemistry
- Genetics
- Molecular Biology
Background:
- Apolipoprotein E (apoE) is crucial for plasma lipid metabolism.
- Three common apoE protein isoforms are currently identified using isoelectric focusing.
- Isoelectric focusing has limitations in distinguishing apoE isoforms and screening for mutations.
Purpose of the Study:
- To develop and present a new method for distinguishing apolipoprotein E (apoE) isoforms.
- To overcome the limitations associated with the isoelectric focusing technique for apoE analysis.
- To facilitate the screening of additional mutations within the apoE gene locus.
Main Methods:
- The study utilized Polymerase Chain Reaction (PCR) to amplify exon 4 of the apoE gene.
- Denaturing Gradient Gel Electrophoresis (DGGE) was employed to analyze the amplified DNA fragments.
- DNA melting characteristics, determined by DGGE, were used to differentiate apoE isoforms.
Main Results:
- The PCR-DGGE method successfully distinguished between the common apoE isoforms.
- This DNA-based approach identified isoforms based on distinct melting behaviors.
- The method proved effective in differentiating apoE genotypes.
Conclusions:
- The developed PCR-DGGE method provides a robust alternative for identifying apoE isoforms.
- This technique circumvents the issues inherent in protein charge-based methods like isoelectric focusing.
- The approach enhances the capability for screening apoE mutations and genetic variations.