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New virtual tool may provide more accurate diagnosis of genetic mutations
Date:2/5/2012

Philadelphia, PA, February 6, 2012 DNA sequencing to detect genetic mutations can aid in the diagnosis and selection of treatment for cancer. Current methods of testing DNA samples, Sanger sequencing and pyrosequencing, occasionally produce complex results that can be difficult or impossible to interpret. Scientists at the Johns Hopkins University School of Medicine have developed a free software program, Pyromaker, that can more accurately identify such complex genetic mutations.

Pyromaker is a web-based application that produces simulated pyrograms based on user input including the percentage of tumor and normal cells, the wild-type sequence, the dispensation order, and any number of mutant sequences. Pyromaker calculates the relative mutant and wild-type allele percentages and then uses these to generate the expected signal at each point in the dispensation sequence. The final result is a virtual trace of the expected pyrogram.

The researchers validated Pyromaker against actual pyrograms containing common mutations in the KRAS gene, which plays an important role in the pathogenesis of a variety of tumors. The actual pyrograms and virtual pyrograms were quantitatively identical for all mutations tested.

They then demonstrated that all codon 12 and 13 single and complex mutations generate unique pyrograms. However, some complex mutations were indistinguishable from single base mutations, indicating that complex mutations may be underreported. Working with two complex pyrograms that were difficult to interpret initially, the researchers identified five approaches to resolve them: Sanger sequencing alone, hypothesis testing with Pyromaker, Pyromaker iterative mutation re-creation, melting curve analysis, and TA cloning with Sanger sequencing.

Senior author James R. Eshleman, MD, PhD, Professor of Pathology and Oncology, Associate Director, Molecular Diagnostics Laboratory, Johns Hopkins University School of Medicine
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Contact: David Sampson
jmdmedia@elsevier.com
215-239-3171
Elsevier Health Sciences
Source:Eurekalert

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