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# SPAligner | ||
# SPAligner: long read to graph aligner | ||
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SPAligner is a tool for fast and accurate alignment of nucleotide sequences to assembly graphs. | ||
It takes file with sequences (in fasta/fastq format) and assembly in GFA format and outputs long read | ||
to graph alignment in various formats (such as tsv, fasta and [GPA](https://github.com/ocxtal/gpa "GPA-format spec")). | ||
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## Compilation | ||
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To compile SPAligner, run | ||
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``` | ||
./spades_compile -SPADES_ENABLE_PROJECTS=spaligner | ||
``` | ||
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After the compilation is complete, `spaligner` executable will be located in the `bin/` folder. | ||
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Tool for fast and accurate alignment of nucleotide sequences (s.a. long reads, coding sequences, etc.) to assembly graphs. | ||
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## Running SPAligner | ||
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spaligner spaligner_config.yaml \ # config file | ||
Synopsis: | ||
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spaligner spaligner_config.yaml \ # config file | ||
-d pacbio \ # data type: pacbio, nanopore | ||
-g assembly_graph.gfa \ # gfa-file with assembly graph | ||
-k 77 \ # graph K-mer size | ||
-s pacbio_reads.fastq.gz \ # sequences to align in fasta/fastq formats | ||
-t 8 # number of threads, 8 by default | ||
-g assembly_graph.gfa \ # assembly graph | ||
-k 77 \ # graph k-mer size | ||
-s pacbio_reads.fastq.gz \ # input sequences / reads | ||
-t 8 # number of threads | ||
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By default, spaligner_config.yaml will be installed into /usr/share/spaligner/ or can be found in assembler/projects/spaligner/. | ||
By default, `spaligner_config.yaml` can be found in `src/projects/spaligner/`. | ||
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Alignments will be saved to spaligner_result/alignment.tsv by default. | ||
Alignments will be saved to `spaligner_result/alignment.tsv` by default. | ||
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## Compilation | ||
### Command line options | ||
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`-d <type> ` | ||
long reads type: `nanopore` or `pacbio` | ||
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`-s <filename> ` | ||
file with sequences in FASTA or FASTQ formats (can be gzipped) | ||
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git clone https://github.com/ablab/spades.git | ||
cd spades/assembler/ | ||
mkdir build && cd build && cmake ../src | ||
make spaligner | ||
`-g <filename> ` | ||
file with an assembly graph in GFA format | ||
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Now to run SPAligner move to folder `assembler/` and execute | ||
`-k <int> ` | ||
k-mer length that was used for graph construction | ||
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`-t <int> ` | ||
number of threads (default: 8) | ||
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`-o, --outdir <dir> ` | ||
output directory to use (default: `spaligner_result/`) | ||
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build/bin/spaligner | ||
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## Output | ||
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Overview of the alignment of the nucleotide query sequence *S* (orange bar) to assembly graph *G*. Assembly graph edges are considered directed left-to-right (explicit edge orientation was omitted to improve the clarity). | ||
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![pipeline](pipeline.jpg) | ||
![pipeline](spaligner.jpg) | ||
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1. **Anchor search.** Anchors (regions of high similarity) between the query and the edge labels are identified with [BWA-MEM](http://bio-bwa.sourceforge.net/). | ||
2. **Anchor filtering.** Anchors shorter than *K*, assembly graph *K*-mer size,(anchors 2, 6, 11), anchors “in the middle” of long edge (anchor 7) or ambiguous anchors (anchor 10 mostly covered by anchor 9, both anchors 4 and 5) are discarded. | ||
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Turning off restore_ends or run_dijkstra in nucleotide sequence alignment mode leads to shorter alignments, but considerable speed-up. | ||
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## Contacts | ||
## References | ||
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If you are using **SPAligner** in your research, please cite: | ||
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[Dvorkina et al., 2020](https://link.springer.com/article/10.1186/s12859-020-03590-7) | ||
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For any questions or suggestions please do not hesitate to contact Tatiana Dvorkina <[email protected]>. |
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