Abstract
We describe a protocol for construction and quantification of libraries for emulsion PCR (emPCR)-based sequencing platforms such as Roche 454 or Ion Torrent PGM. The protocol involves library construction using customized Y adapters, quantification using TaqMan-MGB (minor groove binder) probe–based quantitative PCR (qPCR) and calculation of an optimal template-to-bead ratio based on Poisson statistics, thereby avoiding the need for a laborious titration assay. Unlike other qPCR methods, the TaqMan-MGB probe specifically quantifies effective libraries in molar concentration and does not require specialized equipment. A single quality control step prior to emulsion PCR ensures that libraries contain no adapter dimers and have an optimal length distribution. The presented protocol takes ∼7 h to prepare eight barcoded libraries from genomic DNA into libraries that are ready to use for full-scale emPCR. It will be useful, for example, to allow analyses of precious clinical samples and amplification-free metatranscriptomics.
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Acknowledgements
This study was supported by the Sixth Research Framework Programme of the European Union, a project on infections and cancers (INCA, LSHC-CT-2005-018704); the Karolinska Institutet Faculty funds for partial financing of new doctoral students (KID scholarship) to Z.Z.; and the Swedish Research Council Formas grant (FORMAS) to A.F.A.
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Contributions
Z.Z. designed the Y adapters and qPCR assay, proposed Poisson statistics, conducted the experiments and drafted the manuscript; A.A., Ö.M., S.G. and H.N. assisted with the experiments and provided critical reviews; W.Y., L.E. and A.A. obtained funding and provided critical reviews; A.F.A. supervised the study.
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The authors declare no competing financial interests.
Supplementary information
Supplementary Data 1
454 Titanium library pooling calculation.xls: An example of calculation for 454 sample library pooling. (XLS 41 kb)
Supplementary Data 2
TrimYadapter.txt: A template file for user-customized Y adapter trimming. (XML 5 kb)
Supplementary Data 3
Yscheme.txt: User-defined MID sets for the 8 Y adapters. (TXT 0 kb)
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Zheng, Z., Advani, A., Melefors, Ö. et al. Titration-free 454 sequencing using Y adapters. Nat Protoc 6, 1367–1376 (2011). https://doi.org/10.1038/nprot.2011.369
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DOI: https://doi.org/10.1038/nprot.2011.369
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