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Rapid detection of the prion protein M129V polymorphism with the LightCycler
Daniel Teupser1, Norman Heino, Wolfgang Wilfert
1Institute of Laboratory Medicine, Clinical Chemistry and Molecular Diagnostics, University Hospital Leipzig, Liebigstr. 27, 04103 Leipzig, Germany. daniel@teupser.de
Abstract:
The common single nucleotide polymorphism at codon 129 of the prion protein gene is a key determinant of the genetic susceptibility to Creutzfeldt-Jakob disease (CJD). Recently, a molecular classification of sporadic CJD based on the M129V genotype in conjunction with other determinants was proposed. In the present study, we describe the development and evaluation of a rapid fluorescent-based assay to detect this polymorphism using the LightCycler system. The two polymorphic alleles could be clearly distinguished by their melting points at 52.1 and 60.4 degrees C, representing the 129V and 129M alleles, respectively. These results were confirmed by DNA sequencing. We evaluated our test in 400 patient samples and found no deviations from the expected melting patterns. The calculated allele frequency for the M-allele was 0.66. Thus, we have established a rapid, reliable fluorescent assay for high-throughput detection of the prion protein M129V polymorphism.
Insights
A new fluorescent assay rapidly detects the prion protein M129V gene polymorphism, crucial for Creutzfeldt-Jakob disease (CJD) susceptibility. This reliable method aids in high-throughput genetic screening for CJD risk.
Area of Science:
- Genetics
- Neuroscience
- Molecular Biology
Background:
- The prion protein gene's codon 129 single nucleotide polymorphism (SNP) is vital for Creutzfeldt-Jakob disease (CJD) genetic susceptibility.
- A recent molecular classification of sporadic CJD utilizes the M129V genotype.
Purpose of the Study:
- To develop and validate a rapid, fluorescent-based assay for detecting the prion protein M129V polymorphism.
- To enable high-throughput genotyping for CJD risk assessment.
Main Methods:
- Development of a fluorescent assay utilizing the LightCycler system.
- Distinguishing between 129V and 129M alleles based on melting point differences.
- Confirmation of results using DNA sequencing and evaluation in 400 patient samples.
Main Results:
- The assay clearly differentiated the 129V (52.1°C) and 129M (60.4°C) alleles.
- No deviations from expected melting patterns were observed in 400 patient samples.
- The calculated allele frequency for the M-allele was 0.66.
Conclusions:
- A rapid, reliable, and high-throughput fluorescent assay for the prion protein M129V polymorphism has been established.
- This assay facilitates efficient genetic screening related to CJD susceptibility.
- The method provides accurate genotyping for molecular classification of CJD.