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Updated: May 26, 2026
Rare Event Detection Using Error-corrected DNA and RNA Sequencing
Published on: August 3, 2018
MLPA-based evidence for sequence gain: pitfalls in confirmation and necessity for exclusion of false positives
Rita-Eva Varga1, Rizwan Mumtaz, Amir Jahic
1Department of Clinical Chemistry and Laboratory Diagnostics, University Hospital Jena, Jena, Germany.
Abstract:
Multiplex ligation-dependent probe amplification (MLPA) has become a standard method for identifying copy number mutations in diagnostic and research settings. The occurrence of false-positive deletion findings and the underlying causes are well recognized, whereas false-positive duplication/amplification findings have not been appreciated so far. We here present three pertinent cases which were only identified on extended, nonstandard secondary analyses. We also offer and experimentally validate a potential explanation. Our findings imply that MLPA data indicating gain of genomic sequence require validation on an independent sample or by an independent method.
Insights
False-positive duplication findings in Multiplex Ligation-dependent Probe Amplification (MLPA) are a concern. Extended analysis revealed these issues, suggesting MLPA gain data needs independent validation to ensure accuracy in genetic testing.
Area of Science:
- Genetics
- Molecular Biology
- Diagnostic Technologies
Background:
- Multiplex Ligation-dependent Probe Amplification (MLPA) is a standard technique for detecting copy number variations.
- False-positive deletion findings in MLPA are well-documented.
- False-positive duplication/amplification findings using MLPA have been largely unaddressed.
Purpose of the Study:
- To investigate and highlight the issue of false-positive duplication findings in MLPA.
- To present cases and a potential explanation for these overlooked findings.
- To emphasize the need for validation of MLPA-based copy number gain data.
Main Methods:
- Analysis of three cases with suspected false-positive MLPA duplication findings.
- In-depth, nonstandard secondary analyses of MLPA data.
- Experimental validation of a proposed explanation for the observed anomalies.
Main Results:
- Three cases demonstrating false-positive duplication findings with standard MLPA analysis were identified through extended secondary analyses.
- A potential mechanism explaining these false-positive duplication findings was proposed and experimentally validated.
- The study identified a previously underappreciated source of error in MLPA copy number analysis.
Conclusions:
- MLPA data suggesting a gain of genomic sequence requires careful interpretation and independent validation.
- Independent sample testing or alternative methods are recommended to confirm MLPA findings indicative of amplification.
- The findings necessitate a re-evaluation of MLPA's reliability for detecting copy number gains in clinical and research settings.
