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Metabarcoding.md

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  • multiplex sequencing MiSeq at Macrogen (preliminary, done by lab)
  • demultiplexed on adaptors at Macrogen (preliminary, done by lab)
  • assemble the contigs for each read (by ID, in Mothur, installed on VM)
  • trim the primers and low quality ends, locally in Geneious (see if FASTX-toolkit can be used for this)
  • export the FASTQ from Geneious (see if FASTX-toolkit can be used for this)
  • cleanup with USearch, throw out low Phred score reads, truncate to 200nt (also throw out <200) (usearch 32bit installed on VM)
  • (option: resample to normalize)
  • group identical reads into distinct, unique types per sample, retain counts per type
  • rename sequences in Geneious, give prefix of the sample (name)
  • merge samples into a single file, cluster OTUs, remove chimeric
  • make OTU matrix, identify OTUs taxonomically (perhaps normalize by rarifaction)