Abstract
Ribosome profiling enables sequencing of ribosome-bound fragments of RNA, revealing which transcripts are being translated as well as the position of ribosomes along mRNAs. Although ribosome profiling has been applied to cultured bacterial isolates, its application to uncultured, mixed communities has been challenging. We present MetaRibo-Seq, a protocol that enables the application of ribosome profiling directly to the human fecal microbiome. MetaRibo-Seq is a benchmarked method that includes several modifications to existing ribosome profiling protocols, specifically addressing challenges involving fecal sample storage, purity and input requirements. We also provide a computational workflow to quality control and trim reads, de novo assemble a reference metagenome with metagenomic reads, align MetaRibo-Seq reads to the reference, and assess MetaRibo-Seq library quality (https://github.com/bhattlab/bhattlab_workflows/tree/master/metariboseq). This MetaRibo-Seq protocol enables researchers in standard molecular biology laboratories to study translation in the fecal microbiome in ~5 d.
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Data availability
The data presented in Fig. 3 were generated as part of ref. 27 and can be accessed under BioProject accession PRJNA510123.
Code availability
The pipeline implemented in this paper is available at https://github.com/bhattlab/bhattlab_workflows/tree/master/metariboseq (https://zenodo.org/record/4638134#.YGDevkhKgcg)46. This pipeline creates a de novo assembly from metagenomic reads, maps MetaRibo-Seq reads to the assembly, calls open reading frames across the assembly and creates visualizations such as metagene plots, triplet periodicity histograms and fragment length distribution for aligned MetaRibo-Seq reads. This serves as a baseline assessment of library quality and a starting point for future analysis. Though specifically designed for MetaRibo-Seq, this pipeline would also be generally useful for any situation in which both DNA-sequencing and Ribo-Seq data for an organism with no existing reference genome are available.
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Acknowledgements
We thank D. Maghini, E. Brooks and S. Vance for helpful comments on the manuscript. This work was funded by the Damon Runyon Clinical Investigator Award, grant nos. NIH R01AI148623 and NIH R01AI143757 as well as grant no. NIH P30 AG047366, which supports the Stanford ADRC. Computational work was supported by NIH S10 Shared Instrumentation grant no. 1S10OD02014101 and by NIH grant no. P30 CA124435.
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B.J.F. and A.S.B. conceived the study. B.J.F performed all experiments and data analysis. C.N. wrote the Nextflow computational pipeline. B.J.F. and A.S.B. wrote the paper with input from all authors. All authors read and approved the final manuscript.
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Key references using this protocol
Fremin, B. J. et al. Nat. Commun. 11, 3268 (2020): https://doi.org/10.1038/s41467-020-17081-z
Durrant, M. G. & Bhatt, A.S. Cell Host Microbe 29, 121–131.e4 (2021): https://doi.org/10.1016/j.chom.2020.11.002
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Fremin, B.J., Nicolaou, C. & Bhatt, A.S. Simultaneous ribosome profiling of hundreds of microbes from the human microbiome. Nat Protoc 16, 4676–4691 (2021). https://doi.org/10.1038/s41596-021-00592-4
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DOI: https://doi.org/10.1038/s41596-021-00592-4
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