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16S rRNA gene primer choice impacts off-target amplification in human gastrointestinal tract biopsies and microbiome profiling
T. Deissová, M. Zapletalová, L. Kunovský, R. Kroupa, T. Grolich, Z. Kala, P. Bořilová Linhartová, J. Lochman
Language English Country England, Great Britain
Document type Journal Article, Research Support, Non-U.S. Gov't
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- MeSH
- Biopsy MeSH
- Gastrointestinal Tract MeSH
- Genes, rRNA MeSH
- Humans MeSH
- Microbiota * genetics MeSH
- Reproducibility of Results MeSH
- RNA, Ribosomal, 16S genetics MeSH
- Sequence Analysis, DNA methods MeSH
- High-Throughput Nucleotide Sequencing methods MeSH
- Check Tag
- Humans MeSH
- Publication type
- Journal Article MeSH
- Research Support, Non-U.S. Gov't MeSH
16S rRNA amplicon sequencing or, more recently, metatranscriptomic analysis are currently the only preferred methods for microbial profiling of samples containing a predominant ratio of human to bacterial DNA. However, due to the off-target amplification of human DNA, current protocols are inadequate for bioptic samples. Here we present an efficient, reliable, and affordable method for the bacteriome analysis of clinical samples human DNA content predominates. We determined the microbiota profile in a total of 40 human biopsies of the esophagus, stomach, and duodenum using 16S rRNA amplicon sequencing with the widely used 515F-806R (V4) primers targeting the V4 region, 68F-338R primers and a modified set of 68F-338R (V1-V2M) primers targeting the V1-V2 region. With the V4 primers, on average 70% of amplicon sequence variants (ASV) mapped to the human genome. On the other hand, this off-target amplification was absent when using the V1-V2M primers. Moreover, the V1-V2M primers provided significantly higher taxonomic richness and reproducibility of analysis compared to the V4 primers. We conclude that the V1-V2M 16S rRNA sequencing method is reliable, cost-effective, and applicable for low-bacterial abundant human samples in medical research.
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