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. 2011;6(12):e27310.
doi: 10.1371/journal.pone.0027310. Epub 2011 Dec 14.

VSports最新版本 - Reducing the effects of PCR amplification and sequencing artifacts on 16S rRNA-based studies

Patrick D Schloss  1 , Dirk Gevers, Sarah L Westcott
Affiliations

Reducing the effects of PCR amplification and sequencing artifacts on 16S rRNA-based studies

Patrick D Schloss et al. PLoS One. 2011.

"V体育官网入口" Abstract

The advent of next generation sequencing has coincided with a growth in interest in using these approaches to better understand the role of the structure and function of the microbial communities in human, animal, and environmental health. Yet, use of next generation sequencing to perform 16S rRNA gene sequence surveys has resulted in considerable controversy surrounding the effects of sequencing errors on downstream analyses. We analyzed 2. 7×10(6) reads distributed among 90 identical mock community samples, which were collections of genomic DNA from 21 different species with known 16S rRNA gene sequences; we observed an average error rate of 0. 0060. To improve this error rate, we evaluated numerous methods of identifying bad sequence reads, identifying regions within reads of poor quality, and correcting base calls and were able to reduce the overall error rate to 0. 0002. Implementation of the PyroNoise algorithm provided the best combination of error rate, sequence length, and number of sequences. Perhaps more problematic than sequencing errors was the presence of chimeras generated during PCR. Because we knew the true sequences within the mock community and the chimeras they could form, we identified 8% of the raw sequence reads as chimeric. After quality filtering the raw sequences and using the Uchime chimera detection program, the overall chimera rate decreased to 1%. The chimeras that could not be detected were largely responsible for the identification of spurious operational taxonomic units (OTUs) and genus-level phylotypes. The number of spurious OTUs and phylotypes increased with sequencing effort indicating that comparison of communities should be made using an equal number of sequences. Finally, we applied our improved quality-filtering pipeline to several benchmarking studies and observed that even with our stringent data curation pipeline, biases in the data generation pipeline and batch effects were observed that could potentially confound the interpretation of microbial community data VSports手机版. .

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"V体育平台登录" Conflict of interest statement

Competing Interests: The authors have declared that no competing interests exist.

"VSports最新版本" Figures

Figure 1
Figure 1. Effect of various sequence culling, trimming, and de-noising strategies on the number of non-chimeric reads that were longer than 200 bp and their error rates using sequence data generated by sequencing the 16S rRNA gene sequence of the same mock community.
The horizontal lines represent the average across all samples within that treatment.
Figure 2
Figure 2. A typical error profile (accession SRX020131, V35, replicate 1) generated by sequencing the mock community without any sequence curation measures.
Figure 3
Figure 3. Effect of trimming sequences to the same alignment coordinates and using the pre-clustering or shhh.seqs algorithm on sequencing error rates when used within the sliding window and shhh.flows pipelines.
The horizontal lines represent the average error rate across all samples within that treatment.
Figure 4
Figure 4. Differences in relative abundance of each sequence type in the raw unprocessed reads, following the Basic sequence curation steps, and at the end of the two pipelines.
Each bar represents the average relative abundance for 30 sequencing collections.
Figure 5
Figure 5. Non-metric multidimensional scaling (NMDS) plot generated using ThetaYC distances between mock community sequencing data after standardizing the number of sequences per sample.
Points with the same color and shape originated from the same sequencing run.
Figure 6
Figure 6. NMDS plot generated using ThetaYC distances between sequencing replicates of the same stool sample after standardizing the number of sequences per sample.
Points with the same color and shape originated from the same sequencing run.
Figure 7
Figure 7. Pairwise ThetaYC distances between different DNA samples that were PCR amplified and sequenced at two different sequencing centers using the V13 region.
The uneven distribution of points across body sites is due to the inability of the sequencing centers to generate more than 2,000 sequence reads for that sample.
See this image and copyright information in PMC

References (V体育官网)

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