epi2me-labs / wf-amplicon

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Plans for multiple amplicons per barcode? #11

Closed Kirk3gaard closed 4 months ago

Kirk3gaard commented 5 months ago

Is your feature related to a problem?

Most people doing environmental samples do amplicon sequencing for mixed communities so it would be convenient to have a solution for handling this kind of data.

https://x.com/kirk3gaard/status/1750126916152021098?s=20

Describe the solution you'd like

A QIIME/Mothur/USEARCH/DADA2 equivalent for nanopore data.

Describe alternatives you've considered

Some good ideas were mentioned in the replies to this tweet. QIIME/Mothur/USEARCH

Additional context

No response

julibeg commented 5 months ago

Hi @Kirk3gaard!

Thank you for the feature request. This is on the list of things we would like to include in the workflow, but I cannot give you timelines (or even guarantee that it is going to be included here; it might, for example, be decided to expand the capabilities of wf-16s instead).

If you have a database / reference for your community, you can already use wf-16s to analyse your data (this won't do de novo clustering or similar though).

Regarding the points raised in the linked thread: As noted there, Q28 was achieved and Q30 is within reach. DADA2 needs 10% or more error-free reads in order for the denoising to work. For a 1500 bp gene (e.g. 16S) this would require Q28 or above. This means that full-length 16S ASVs from ONT reads would be possible (which is very exciting).

However, as noted during the last ONT Update at NCM Houston, these improved conditions + basecallers are still under active development. We will revisit the question of DADA2 once they become available.

julibeg commented 4 months ago

Closing for now