How do I convert BAM files to FASTQ?

How do I convert BAM files to FASTQ?

Converting BAM to fastq

1. samtools sort -n SAMPLE.bam -o SAMPLE_sorted.bam.
2. samtools fastq -@ 8 SAMPLE_sorted.bam \
3. -1 SAMPLE_R1.fastq.gz \
4. -2 SAMPLE_R2.fastq.gz \
5. samtools bam2fq SAMPLE.
6. cat SAMPLE.fastq | grep ‘^@.*/1$’ -A 3 –no-group-separator > SAMPLE_r1.fastq.

How do I open a BAM file with samtools?

To convert SAM to BAM, we use the samtools view command. We must specify that our input is in SAM format (by default it expects BAM) using the -S option. We must also say that we want the output to be BAM (by default it produces BAM) with the -b option.

How do I extract unmapped files from a BAM file?

The process is done in two steps: Extracting the unmapped reads into a readname sorted BAM file. Converting the BAM file to fastq read files….Filter Alignments for unmapped pairs

1. An unmapped read whose mate is mapped.
2. A mapped read who’s mate is unmapped.
3. Both reads of the pair are unmapped.

How do I convert Fasta to FASTQ?

1. Use wget or curl to download it. wget https://fasta-to-fastq.googlecode.com/files/fasta_to_fastq.pl.
2. Get permission. chmod u+x fasta_to_fastq.pl.
3. run it.

Is BAM file sorted?

BAM files are sorted by reference coordinates (samtools sort)

Do BAM files contain unmapped reads?

Answer: You can identify the unmapped reads using the flags from column 2 in in the BAM file. These flags are described in the SAM/BAM specification here.

How to convert BAM files to FASTQ files?

I need to convert a BAM file of paired-end alignments to two FASTQ files of paired reads to realign them, with a twist: I only want reads that fall within a defined region.

When to use BAM for paired FASTQ in BedTools?

Used if BAM contains paired-end data. BAM should be sorted by query name ( samtools sort -n -o aln.qsort.bam aln.bam) if creating paired FASTQ with this option. Create FASTQ based on the mate info in the BAM R2 and Q2 tags. By default, each alignment in the BAM file is converted to a FASTQ record in the -fq file.

How is FASTQ created in Bam R2 and Q2?

Create FASTQ based on the mate info in the BAM R2 and Q2 tags. By default, each alignment in the BAM file is converted to a FASTQ record in the -fq file. The order of the records in the resulting FASTQ exactly follows the order of the records in the BAM input file.

How to write Singleton reads to a FASTQ file?

Write singleton reads to FILE. Copy RG, BC and QT tags to the FASTQ header line, if they exist. Specify a comma-separated list of tags to copy to the FASTQ header line, if they exist. Write reads with the READ1 FLAG set (and READ2 not set) to FILE instead of outputting them. If the -s option is used, only paired reads will be written to this file.