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Genetic Variant Detection in the CALR gene using High Resolution Melting Analysis
Published on: August 26, 2020
High-resolution melting analysis using unlabeled probe and amplicon scanning simultaneously detects several lactase
Jurgita Janukonyté1, Else M Vestergaard, Søren A Ladefoged
1Department of Clinical Biochemistry, Aarhus University Hospital, AS - THG, Aarhus, Denmark.
Scandinavian Journal of Clinical and Laboratory Investigation
|October 30, 2010
Summary
A new high-resolution melting analysis method can simultaneously detect common and rare genetic variants associated with lactase persistence. This improves the genetic diagnosis of lactose intolerance, especially in diverse populations.
Area of Science:
- Genetics
- Molecular Biology
- Human Physiology
Background:
- Lactase persistence, enabling lactose tolerance, is common in Northern Europeans and linked to the LCT -13910C>T variant.
- Other variants near LCT -13910C>T are associated with lactase persistence in African and Middle Eastern populations, limiting standard SNP analysis for lactose intolerance diagnosis.
- Existing diagnostic methods like TaqMan assays may not detect these diverse variants.
Purpose of the Study:
- To develop a novel assay for simultaneous detection of LCT -13910C>T and nearby variants, improving lactose intolerance genetic diagnosis.
- To identify previously undetected variants in populations with diverse genetic backgrounds.
- To enhance the diagnostic accuracy of genetic testing for lactose intolerance.
Main Methods:
- Development of a new high-resolution melting (HRM) analysis assay using unlabeled probe genotyping.
- Simultaneous amplicon scanning for variant detection.
- Genotyping of 78 patients, including identification of five individuals heterozygous for the -13915T>G variant missed by TaqMan assays.
Main Results:
- The new HRM assay successfully distinguished between -13910 and -13915 genotypes.
- Five samples, previously genotyped as -13910C/C by TaqMan, were identified as heterozygous for -13915T>G using the HRM assay.
- Two rare variants, -13907C>G and -13913T>C, were also identified.
- The assay demonstrated the ability to detect multiple variants around the -13910 site simultaneously.
Conclusions:
- The developed unlabeled probe-based HRM assay offers a cost-effective and accurate method for simultaneous detection of LCT -13910C>T, -13915T>G, and other rare variants.
- This improved diagnostic tool can enhance the genetic analysis of lactose intolerance, particularly in diverse ethnic groups.
- The method holds potential for broader application in genetic diagnostics for lactase persistence.
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