Question: Fastq to BAM
0
gravatar for zliew
7 months ago by
zliew0
zliew0 wrote:

I'm new to Galaxy and bioinformatics tool.

I have Fastq data of chicken heavy and light chains and I want to do pca plot on them. I know I have to convert them to BAM file first but I don't know which tool to use - FastqtoSam or Bowtie2. One gave me unaligned BAM and another gave aligned BAM. Then, I used multiBAMsummary tool to see which file was correct but both BAM file gave me an error saying file '0.bam' does not have BAM or CRAM format.

Where did I go wrong?

bam fastq • 847 views
ADD COMMENTlink modified 6 months ago by Biostar ♦♦ 20 • written 7 months ago by zliew0

If you want BAM files outputs you can use Rsubread package on R software or use bowtie2 to have SAM format witch you can transform to BAM format with Samtools. They are many tools for this kind of analysis, you can find them in literature. Best regards.

ADD REPLYlink modified 7 months ago by WouterDeCoster42k • written 7 months ago by justinkablan22510

Ok I'll try it. Thank you!

ADD REPLYlink written 7 months ago by zliew0

Did you sort and index your aligned BAM file?

ADD REPLYlink written 7 months ago by genomax76k

No, how do I do that?

ADD REPLYlink written 7 months ago by zliew0

A: samtools sorting and indexing

ADD REPLYlink written 7 months ago by manuel.belmadani1.2k

By using samtools sort tool followed by samtools index in Galaxy interface.

ADD REPLYlink modified 7 months ago • written 7 months ago by genomax76k

Ok. I'll give it a try. Thank you!

ADD REPLYlink written 7 months ago by zliew0

I want to do pca plot on them

What are you trying to find out?

One gave me unaligned BAM and another gave aligned BAM.

That makes sense. Bowtie2 is an aligner, FastqToSam probably just takes the reads and sticks them in a SAM/BAM format. We can't say which one is right for you without knowing what your goal is. The unaligned one is likely only useful for compatibility with tools expecting a BAM file

Then, I used multiBAMsummary tool to see which file was correct but both BAM file gave me an error saying file '0.bam' does not have BAM or CRAM format

Can you post the exact command you used? What size are your input BAM files?

ADD REPLYlink written 7 months ago by manuel.belmadani1.2k

I have 2 treatment groups - control and probiotic for chicken heavy and light chain. I'm trying to look at the variability of sequences between those treatment group.

I used multiBamsummary under deep Tools. I just noticed the file size says 0 bytes. The run showed up green so I automatically assume that it worked.

ADD REPLYlink written 7 months ago by zliew0
1
gravatar for evelyn
7 months ago by
evelyn80
evelyn80 wrote:

That means it did not run. You can align the fastq files using bowtie2:

bowtie2  -x index -1 R1.fastq -2 R2.fastq -S bowtie.sam

Then convert the sam to bam using samtools:

samtools view -bS bowtie.sam -o bowtie.bam

Then sort it:

samtools sort bowtie.bam -o bowtie.sorted.bam

You can index the .sorted.bam by using:

samtools index bowtie.sorted.bam
ADD COMMENTlink modified 7 months ago • written 7 months ago by evelyn80

I have tried it and it worked! Thank you!

ADD REPLYlink written 7 months ago by zliew0

In short:

bowtie2 (options...) | samtools sort -o bowtie.bam
samtools index bowtie.bam
ADD REPLYlink written 6 months ago by ATpoint28k
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