Analysis of the quality of contact pin fabricated oligonucleotide microarrays
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As the quality of microarrays is critical to successful experiments for data consistency and validity, a reliable and convenient quality control method is needed. We describe a systematic quality control method for large-scale genome oligonucleotide arrays. This method is comprised of three steps to assess the quality of printed arrays. The first step involves assessment of the autofluorescence property of DNA. This step is convenient, quick to perform, and allowed reuse of every array. The second step involves hybridization of arrays with Cy3-labeled 9-meroligonucleotide target to asess the quality and stability of oligonucleotides. Because this step consumed arrays, one or two arrays from each batch were used to complement the quality control data from autofluorescence. The third step involves hybridization of arrays from every batch with transcripts derived from two cell lines to asess data consistency. These hybridizations were able to distinguish two closely related tissue samples by identifying a cluster of 20 genes that were differently expressed in U87MG and T98G glioblastoma cell lines. In addition, we standardized two parameters that significantly enhanced the quality of arrays. We found that longer pin contact time and crosslinking oligonucleotides at 400 mJ/cm2 were optimal for the highest hybridization intensity. Taken together, these results in indicate that the quality of spotted oligonucleotide arrays should be assessed by at least two methods, autofluorescence and 9-mer hybridization before arrays are used for hybridization experiments.
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- Analysis of the quality of contact pin fabricated oligonucleotide microarrays
Volume 34, Issue 3 , pp 303-315
- Cover Date
- Print ISSN
- Online ISSN
- Humana Press
- Additional Links
- Quality control
- printed microarrays
- 70-mer oligonucleotide array
- 9-mer nucleotide hybridization
- quality testing
- Industry Sectors
- Author Affiliations
- 1. Tumor Vaccines and Biotechnology Branch, Division of Cellularand Gene Therapies, Center for Biologics evaluation and Research, Food and Drug Administration, RM 2NN2), Building 29B, 8800 Rockville Pike, 20892, Bithesda, MA
- 2. Advanced Technology Center, Center for Cancer Research, National Cancer Institute, 20877, Gaithersburg, MD