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A lot of metagenomics analysis is done using command-line tools for three reasons:

  1. You will often be working with a large number of files, and working through the command line rather than through a graphical user interface (GUI) allows you to automate repetitive tasks.

  2. You will often need more computing power than is available on your personal computer, and connecting to and interacting with remote computers requires a command-line interface.

  3. You will often need to customize your analyses, and command-line tools often enable more customization than the corresponding GUI tools (if a GUI tool even exists).

In a previous lesson, you learned how to use the bash shell to interact with your computer through a command-line interface. In this lesson, you will be applying this new knowledge to carry out a common metagenomics workflow - identifying Operational Taxonomic Unities (OTUs) among samples taken from two metagenomes within a location. We will be starting with a set of sequenced reads (.fastq files), perform some quality control steps, assemble those reads into contigs and finishes by identifying and visualizing the OTUs among these samples.

As you progress through this lesson, keep in mind that even if you aren’t going to be doing this same workflow in your research, you will be learning some very important lessons about using command-line bioinformatics tools. What you are going to learn here will enable you to use a variety of bioinformatics tools with confidence and greatly enhance your research efficiency and productivity.

Prerequisites

This lesson assumes a working understanding of the bash shell. If you haven’t already completed the Introduction to the Command Line for Metagenomics lesson, and you aren’t familiar with the bash shell; please review those materials before starting this lesson.

This lesson also assumes some familiarity with biological concepts, including the structure of DNA, nucleotide abbreviations, and the concepts microbiome and taxonomy.

This lesson uses data hosted on an Amazon Machine Instance (AMI). Workshop participants will be given information on how to log in to the AMI during the workshop. Learners using these materials for the self-directed study must set up their own AMI. Information on setting up an AMI and accessing the required data is provided on the Metagenomics Workshop setup page.

{: .prereq}

Things You Need To Know

  1. Stay calm, and don't panic.
  2. Everything is going to be fine.
  3. We are learning together. {: .checklist}

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This is the fourth lesson of the Metagenomics Workshop, comprising four lessons in total.

Citation

Please cite as: DOI

Claudia Zirión Martínez; Diego Garfias Gallegos; Tania Vanessa Arellano Fernández; Aarón Espinosa Jaime; Edder D Bustos Díaz; José Abel Lovaco Flores; Luis Gerardo Tejero Gómez; J Abraham Avelar Rivas; Nelly Sélem (March , 2023) A Data Carpentry- Style Metagenomics Workshop

Lesson Reference

Episodes 2. Assessing Read Quality, and 3. Trimming and Filtering are adapted from the corresponding episodes in the Data Wrangling and Processing for Genomics lesson that is Copyright (c) The Carpentries. Materials licensed under CC-BY 4.0by the authors: Josh Herr, Ming Tang, Lex Nederbragt, Fotis Psomopoulos (eds): Version 2017.11.0, November 2017. THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.