Gapped short-read and long-read alignment based on maximal exact match seeds. The command above could also be written on a single line; however in the documentation we usually format command to display on multiple lines for clarity. Reducing INT leads to longer indels.
In addition, the insert size distribution is output as both a histogram. Most users expect Bowtie to produce the same output when run twice on the same input. For additional information on these types of artifacts, please see the corresponding GATK dictionary entries on bait-bias and pre-adapter artifacts.
Command Line Overview
Similarly if --al-lz4 is specified, output will be lz4 compressed. Mapping quality minimum cutoff Default value: Please see List of alignment visualization software.
Stop after processing N reads, mainly for debugging. Whether the file contains bisulfite sequence used when calculating the NM tag. Pairs are often stored in a pair of files, one file containing the mate 1s and the other containing the mates 2s. Due to 5' read clipping, duplicates do not necessarily have the same 5' alignment coordinates, so the algorithm needs to search around the neighborhood. Applying this option greatly helps to reduce false SNPs caused by misalignments.
Similar to --tab5 except, for paired-end reads, the second end can have a different name from the first: Put into UR field of sequence dictionary entry. If true, also include reads marked as duplicates in the insert size histogram. For example a BED file containing locations of genes in chromosome 20 could be specified using -r 20 -l chr The sequence dictionary of each input file must be identical, although this command does not check this.
True if we are to clip overlapping reads, false otherwise. Extensions as described above are appended. Alignment of cDNA sequences to a genome. The read name header formatting to emit. Collect metrics to quantify single-base sequencing artifacts. Setting stringency to SILENT can improve performance when processing a BAM file in which variable-length data read, qualities, tags do not otherwise need to be decoded.
If true then fields need to be delimited by a single tab. The maximum number of bases to consider when comparing reads 0 means no maximum. Many standalone biological applications mapper, split mapper, mappability, and other provided. From Wikipedia, the free encyclopedia.
Content and Collaboration
These metrics are provided both per-barcode and per lane and can be found in the BaseCalls directory. By default, samtools tries to select a format based on the -o filename extension; if output is to standard output or no format can be deduced, bam is selected. The length of each individual bait to design Default value: Significant increase in time to map reads with mismatches or color errors. If the types of the tags are different, they will be sorted so that single character tags type A come before array tags type B , then string tags types H and Z , then numeric tags types f and i. The probability of keeping any individual read, between 0 and 1.
A sequence dictionary corresponding to the reference fasta is required. If specified, only print results for these contexts in the detail metrics output. The command should print many lines of output then quit. Samtools is designed to work on a stream.
- This command will exit with a non-zero exit code if any input files don't have a valid header or are missing an EOF block. For example, running Bowtie 2 with the --very-sensitive option is the same as running with options: For instance, specifying L,0, Size is 0 if the mates did not align concordantly.
- A read is considered to have repetitive seeds if the total number of seed hits divided by the number of seeds that aligned at least once is greater than In paired-end mode, --nofw and --norc pertain to the fragments; i. Quality values are set to all Is 40 on Phred scale. The minimum QD value to accept or otherwise filter out the variant. Uses a ConstantMemory strategy to downsample the incoming stream to approximately the desired proportion, and then a HighAccuracy strategy to finish. Comma-separated list of files containing unpaired reads to be aligned, e.
In addition, record names can be truncated at the first instance of a whitespace character to ensure downstream compatibility. Useful for digital gene expression, SNP and indel genotyping. The standard behavior of truncating at the first whitespace can be suppressed with --sam-no-qname-trunc at the expense of generating non-standard SAM.
The number of threads that will be used to collect the metrics. However, when the user specifies the --non-deterministic option, Bowtie 2 will use the current time to re-initialize the pseudo-random number generator. The base prefix of output files to write.
Fast and sensitive read alignment
When this option is in use, phase-0 reads will be saved in file STR. Indexes the genome with periodic seeds to quickly find alignments with full sensitivity up to four mismatches. Processes , to , reads per second varies with data, hardware, and configured sensitivity. This tool will produce per-barcode and per-lane basecall metrics for each sequencing run. Normally, Bowtie 2 re-initializes its pseudo-random generator for each read.