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A novel method for creating artificial mutant samples for performance evaluation and quality control in clinical
Michael Jarvis1, Ramaswamy K Iyer, Laurina O Williams
1Department of Pathology and Laboratory Medicine, University of California at Los Angeles School of Medicine, 10833 Le Conte Ave., Los Angeles, CA 90095-1732, USA.
The Journal of Molecular Diagnostics : JMD
|April 29, 2005
Summary
Artificial DNA samples with specific mutations can overcome the shortage of patient samples for genetic testing quality control. These novel constructs ensure reliable molecular diagnostics and laboratory proficiency for rare disorders.
Area of Science:
- Molecular Genetics
- Biotechnology
- Clinical Diagnostics
Background:
- Limited availability of patient-derived DNA hinders molecular genetic testing quality control for rare and heterozygous disorders.
- A scarcity of clinically relevant mutation-positive samples impedes laboratory proficiency and performance evaluation.
- Artificial DNA samples mimicking natural human samples are needed for realistic quality assurance.
Purpose of the Study:
- To develop and validate artificial DNA samples for molecular genetic testing quality control.
- To create a prototype using the cystic fibrosis gene (CFTR) for generating mutation-containing DNA constructs.
- To assess the utility of these artificial samples for performance evaluation and proficiency testing.
Main Methods:
- Utilized site-directed mutagenesis to introduce specific CFTR mutations (G85E, 1078delT) into plasmid DNA.
- Constructed artificial DNA samples with defined ratios of wild-type and mutated plasmids, bacterial artificial chromosomes, and nonhuman genomic DNA.
- Tested the performance of these constructs in-house and across nine pilot laboratories using diverse technical platforms.
Main Results:
- Generated artificial DNA samples containing CFTR mutations in both heterozygous and homozygous states.
- Demonstrated that these constructs are valid and accessible materials for quality assurance purposes.
- Confirmed the suitability of artificial samples for performance evaluation, proficiency testing, and assay quality control.
Conclusions:
- Artificial DNA constructs can effectively substitute for scarce patient-derived samples in molecular diagnostics.
- The developed methodology provides a reliable solution for enhancing laboratory proficiency and quality control in genetic testing.
- These novel materials support robust quality assurance for a wide range of genetic disorders, including rare and heterozygous conditions.