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Microbial Amplicon Analysis: Glossary

Key Points

Demultiplexing Reads
  • Barcodes let us sequence many samples at the same time and separate them computationally

  • Most pipelines require demultiplexing reads as a first step

Sequnece quality control
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Counting microbes with QIIME2-Deblur
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Counting microbes with DADA2
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Counting microbes with mothur
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Beta diversity
  • Beta diversity measures the diversity between samples in a dataset

  • The most common beta diversity measures are Bray-Curtis, Weighted/Unweighted Unifrac, and NMDS

  • Beta diversity is usually displayed as a principal coordinates plot

  • Cluster analysis can identify groups of samples, but care must be taken to be sure the groups are meaningful

Finding Differentially Abundant Microbes
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Glossary

Amplicon
A piece of DNA made by amplifying (making many copies) of a specific target site.
Illumina
A common method of DNA sequencing that generates millions of short (<500 base-pair) sequences.
Metagenomics
Analysis of random segments of DNA from a microbial community instead of specific amplicons.
mothur
A software suite commonly used for amplicon analysis.
PCR
Polymerase Chain Reaction, the most common way to amplify small amounts of DNA and prepare them for sequencing.
Primers
The short pieces of synthetic DNA used to specify the target for amplification.
QIIME 2
A software suite commonly used for amplicon analysis.