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Using a Pan-Viral Microarray Assay Virochip to Screen Clinical Samples for Viral Pathogens
Published on: April 27, 2011
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Screening for viral extraneous agents in live-attenuated avian vaccines by using a microbial microarray and
Majken Lindholm Olesen1, Lotte Leick Jørgensen2, Merete Blixenkrone-Møller2
1Virus Research and Development Laboratory, Department of Microbiological Diagnostics and Virology, Statens Serum Institut, Artillerivej 5, 2300 Copenhagen S, Denmark.
Summary
This study explored using genomic microarrays and sequencing to detect extraneous agents (EA) in live-attenuated vaccines. The methods successfully identified potential viral contaminants, aiding vaccine safety assessments.
Area of Science:
- Microbiology and Virology
- Vaccine Development and Safety
- Genomics and Bioinformatics
Background:
- Ensuring the absence of extraneous agents (EA) is critical for the safety of biological medicinal products, particularly live-attenuated vaccines.
- Current screening methods may require enhancement for comprehensive detection of viral EAs in complex biological matrices.
Purpose of the Study:
- To evaluate the utility of the Lawrence Livermore Microbial Detection Array version 2 (LLMDAv2) coupled with whole genome amplification and sequencing.
- To screen for viral EAs in live-attenuated vaccines and specific pathogen-free (SPF) eggs.
Main Methods:
- Utilized the LLMDAv2 for initial screening of viral agents in vaccine and SPF egg samples.
- Employed whole genome amplification and next-generation sequencing (e.g., MiSeq) for detailed analysis.
- Applied microarray probe mapping and PCR to assess the specificity of detected signals and identify potential cross-hybridization.
Main Results:
- Detected positive microarray signals for avian endogenous retrovirus EAV-HP and Alpharetrovirus genus viruses in all samples.
- Microarray probe mapping and PCR indicated that some positive signals resulted from cross-hybridization with chicken genomic sequences (EAV-HPΔpol, ALV-E ev loci).
- Next-generation sequencing confirmed microarray findings and demonstrated similar cross-hybridization patterns.
Conclusions:
- Genomic microarrays and sequencing are applicable for screening extraneous viral agents in avian attenuated vaccines.
- The study highlights the importance of rigorous validation to differentiate true positives from cross-hybridization artifacts in genomic screening.
- These combined techniques offer a valuable approach for enhancing the safety and quality control of biological products.
