MULTI-seq | R implementation of MULTI-seq sample classification workflow | Genomics library
kandi X-RAY | MULTI-seq Summary
kandi X-RAY | MULTI-seq Summary
deMULTIplex is an R package containing the companion software for our method for single-cell RNA sequencing sample Multiplexing Using Lipid-Tagged Indices: MULTI-seq (for more information, check out our Nature Methods manuscript: MULTI-seq is methodologically analogous to the Cell Hashing (Stoeckius et al., 2018, Genome Biology) and Click-Tags (Gehring et al., 2019, NBT) except we utilize lipid- and cholesterol-modified oligonucleotides to rapidly and non-perturbatively label live-cell and nuclear membranes. If you want try out MULTI-seq reagents (for free!), fill out this form and/or send me an email (chris.mcginnis@ucsf[dot]edu). MULTI-seq interfaces with any droplet microlfuidics-based scRNA-seq methodology (e.g., 3' and 5' 10X Genomics, Drop-Seq, In-Drop, Seq-Well, etc.), and is also compatible with single-nucleus RNA-sequencing. MULTI-seq can also be used simultaneously with CITE-seq/REAP-seq/Total-seq for single-cell proteomics. We currently supply LMOs for 96 samples, and MULTI-seq reagents will soon be available commercially from Millipore-Sigma (contact james.hoberg@milliporesigma[dot]com for more info). Download example dataset for trying deMULTIplex here: NOTE: This 8-donor PBMC experiment is different from the HMEC data used in the tutorial. I opted to upload these data because (i) the MULTI-seq barcoding work very well and there were no missing barcodes, (ii) negative-cell reclassification was unncessary because >95% of the cells were classified, and (iii) the files are much smaller.
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QUESTION
First, I apologize for my pythonic ignorance. I need to break up my multi-sequence fasta file into equal sized chunks for a pipeline downstream. I haven't run across anything that does this easily or in the format I'm looking for.
An example fasta file input:
original.fas >contig1ACGTA
>contig2GGGATAGTCA
>contig3GACTACTTTT
The above example fasta has 25bp. If I set the "chunk number" parameter to '4', then I would expect my output files to all have 7 base pairs, except for the last file which would have the remainder 4bp. It would look like this:
chunk1.fas >contig1:0-4ACGTA
>contig2:0-1GG
chunk2.fas >contig2:2-7GATAGTC
chunk3.fas >contig2:9-9A
>contig3:0-5GACTAC
chunk4.fas >contig3:6-9TTTT
Notice each resulting chunk*.fas includes 7 base pairs, except for the leftover base pairs in chunk4.fas. Also, each resulting sequence header in the chunk files have changed from the original, so that they include a ":" as well as a "start" and "stop" location derived from the original sequence.
The biopython cookbook has a pretty nice batch size iterator tool and I think my answer resides within manipulating this code, but I haven't a clue how to go about this.
Any help is appreciated. Cheers.
...ANSWER
Answered 2019-Oct-11 at 14:24That is not an easy task, but have a look at this implementation:
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