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Originally posted by fanli View PostOut of curiosity, why are you joining the read pairs? A lot of the metagenomics software out there now supports paired end reads as input. The metaSPAdes assembler @GenoMax mentioned requires paired end data IIRC.
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Would something like kraken or CLARK not be helpful? Are you trying to assemble and annotate de novo genomes? Or trying to figure out the microbial composition and functional content? I guess my point is you would discard ~40% of your data in the joining process, which may not be necessary depending on your task of interest.
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Originally posted by fanli View PostWould something like kraken or CLARK not be helpful? Are you trying to assemble and annotate de novo genomes? Or trying to figure out the microbial composition and functional content? I guess my point is you would discard ~40% of your data in the joining process, which may not be necessary depending on your task of interest.
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You might find this benchmark to be helpful:
My understanding is that you are better off using newer k-mer based approaches as opposed to BLAST. I've had reasonable success with kraken, although the memory requirements are somewhat onerous. You also have to be extremely careful about removing contaminant (aka human) sequences as these tend to get misclassified.
Another option is kallisto (https://github.com/pachterlab/metakallisto) but I have yet to be able to even build a database due to memory constraints.
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Originally posted by fanli View PostYou might find this benchmark to be helpful:
My understanding is that you are better off using newer k-mer based approaches as opposed to BLAST. I've had reasonable success with kraken, although the memory requirements are somewhat onerous. You also have to be extremely careful about removing contaminant (aka human) sequences as these tend to get misclassified.
Another option is kallisto (https://github.com/pachterlab/metakallisto) but I have yet to be able to even build a database due to memory constraints.
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