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Efficient and Scalable Production of Full-length Human Huntingtin Variants in Mammalian Cells using a Transient Expression System
Published on: December 10, 2021
Single-step scalable-throughput molecular screening for Huntington disease
Clara R L Teo1, Wen Wang, Hai Yang Law
1Department of Pediatrics, Yong Loo Lin School of Medicine, National University of Singapore, Singapore.
Clinical Chemistry
|April 12, 2008
Summary
A new single-step screening method accurately detects Huntington disease (HD) alleles by combining PCR amplification and melting-curve analysis. This rapid assay simplifies molecular diagnosis for this fatal neurodegenerative disorder.
Area of Science:
- Genetics and Molecular Biology
- Neurodegenerative Disorders
- Diagnostic Assays
Background:
- Huntington disease (HD) is a fatal autosomal dominant neurodegenerative disorder.
- Caused by an expanded CAG trinucleotide repeat in the HTT gene.
- Current molecular diagnosis requires separate amplification and detection steps.
Purpose of the Study:
- To evaluate a novel, rapid, single-step screening method for HD.
- To combine amplification and detection into a closed-tube format.
- To improve the efficiency of molecular diagnosis for Huntington disease.
Main Methods:
- Developed a microplate-based assay combining PCR and automated melting-curve analysis.
- Established cutoff melting temperatures (T(m)s) using reference DNA with known CAG-repeat sizes.
- Validated the assay with diverse populations and a blinded analysis of clinical samples.
Main Results:
- Observed a strong correlation between CAG-repeat size and amplicon T(m).
- Identified a 1.1% false-positive rate in initial screening.
- Achieved accurate classification of all samples in the blinded validation analysis.
Conclusions:
- The homogeneous assay is simple, scalable, rapid, and accurate.
- It can serve as a convenient screen for pathologic expanded HD alleles.
- This method simplifies the molecular detection of Huntington disease.
