An optimized protocol for high-throughput amplicon-based microbiome profiling
Here we describe an optimized protocol for amplicon-based microbiome profiling by next-generation sequencing (NGS). The protocol uses a modular, two-step PCR process that provides versatility as a common set of indexing primers can be paired with many sets of marker gene specific primers. We describe primer sets that have been used to prepare libraries for variable regions V1-V3, V3-V4 V3-V5, V4, V4-V6, and V5-V6 of the 16S ribosomal RNA (rRNA) gene, as well as for variable region V9 of the 18S rRNA gene and the ITS1 and ITS2 regions. This protocol is designed for high-throughput and incorporates the best practices for amplicon-based NGS library preparation that we have previously described. We have demonstrated that these best practices substantially increase accuracy compared to existing methods and also, importantly, minimize the dropout of taxa that have mismatches to the amplification primers.
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This is a list of supplementary files associated with this preprint. Click to download.
Table 2 Dual-indexing primers The sequence and suggested ordering layout of the indexing primer set (16 forward and 24 reverse primers, which allow multiplexing of up to 384 samples per lane) is shown, along with the indexing scheme (corresponding to the MiSeq setup templates), the index name, and the index sequence as it should appear in the sample sheet.
Protocol Supplemental Files Supplemental Files
Table 1 Marker gene primer sequences with dual-indexing adapters The marker gene targeted portion of the primer is highlighted in bold. * indicates a phosphorothiol bond, which prevents excessive adapter dimer formation with the ITS1 primer set.
Does Table 2 refer to "indexing_primers.xlsx." If so, that only contains the primer sequences. There are no examples of plate layouts. Thank you.
I believe there is a typo in Appendix 1, 1, iii: "Next transfer 20 μl of each forward index to the row(s) containing water." It should be "reverse index."
Posted 25 Jul, 2016
An optimized protocol for high-throughput amplicon-based microbiome profiling
Posted 25 Jul, 2016
Here we describe an optimized protocol for amplicon-based microbiome profiling by next-generation sequencing (NGS). The protocol uses a modular, two-step PCR process that provides versatility as a common set of indexing primers can be paired with many sets of marker gene specific primers. We describe primer sets that have been used to prepare libraries for variable regions V1-V3, V3-V4 V3-V5, V4, V4-V6, and V5-V6 of the 16S ribosomal RNA (rRNA) gene, as well as for variable region V9 of the 18S rRNA gene and the ITS1 and ITS2 regions. This protocol is designed for high-throughput and incorporates the best practices for amplicon-based NGS library preparation that we have previously described. We have demonstrated that these best practices substantially increase accuracy compared to existing methods and also, importantly, minimize the dropout of taxa that have mismatches to the amplification primers.
Figure 1
Figure 2
Figure 3
Figure 4
Does Table 2 refer to "indexing_primers.xlsx." If so, that only contains the primer sequences. There are no examples of plate layouts. Thank you.
I believe there is a typo in Appendix 1, 1, iii: "Next transfer 20 μl of each forward index to the row(s) containing water." It should be "reverse index."
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