Sequence Logo For Different Alleles Or Generated From Sam/Bam
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11.1 years ago

I have a SAM/BAM file and instead of displaying it in IGV or another browser, I would like to make a sequence logo out of it. My favourite software WebLogo does not support SAM/BAM file as an input (instead it supports CLUSTALW, FASTA, plain flatfile, MSF, NBRF, PIR, NEXUS and PHYLIP)

I would like to avoid parsing SAM file by myself and adding '-' when needed. Do you have any idea if there is already some software that could do such a thing? Thanks a lot.

The second question is about different alleles. I would like to visualize sequences (reads) from each allele with another color. I have found many coloring schemes, but none dividing sequences into groups together with corresponding coloring. Thanks a lot.

sam • 6.4k views
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11.1 years ago

I quickly wrote a java tool sam4weblogo: https://github.com/lindenb/jvarkit#sam4weblogo using the picard library.

enter image description here

$ java -jar dist/sam4weblogo.jar I=path/to/samtools-0.1.18/examples/sorted.bam R=seq1:80-110 2> /dev/null 

>B7_593:4:106:316:452/1
TGTTG--------------------------
>B7_593:4:106:316:452a/1
TGTTG--------------------------
>B7_593:4:106:316:452b/1
TGTTG--------------------------
>B7_589:8:113:968:19/2
TGGGG--------------------------
>B7_589:8:113:968:19a/2
TGGGG--------------------------
>B7_589:8:113:968:19b/2
TGGGG--------------------------
>EAS54_65:3:321:311:983/1
TGTGGG-------------------------
>EAS54_65:3:321:311:983a/1
TGTGGG-------------------------
>EAS54_65:3:321:311:983b/1
TGTGGG-------------------------
>B7_591:6:155:12:674/2
TGTGGGGG-----------------------
>B7_591:6:155:12:674a/2
TGTGGGGG-----------------------
>B7_591:6:155:12:674b/2
TGTGGGGG-----------------------
>EAS219_FC30151:7:51:1429:1043/2
TGTGGGGGGCGCCG-----------------
>EAS219_FC30151:7:51:1429:1043a/2
TGTGGGGGGCGCCG-----------------
>EAS219_FC30151:7:51:1429:1043b/2
TGTGGGGGGCGCCG-----------------
>B7_591:5:42:540:501/1
TGTGGGGGCCGCAGTG---------------
>EAS192_3:5:223:142:410/1
TGGGGGGGGCGCAGT----------------
>B7_591:5:42:540:501a/1
TGTGGGGGCCGCAGTG---------------
>EAS192_3:5:223:142:410a/1
TGGGGGGGGCGCAGT----------------
>B7_591:5:42:540:501b/1
TGTGGGGGCCGCAGTG---------------
>EAS192_3:5:223:142:410b/1
TGGGGGGGGCGCAGT----------------
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Pierre, you are definitely Tolkien of bioinformatics! Thanks.

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Please help me in running sam4weblogo

I downloaded jvarkit-master.zip and unzip how to use it

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you need to compile it; Read the manual please.

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I am having problems installing berkeleydb.jar, could you please give me short advice how to install it? (I am ubuntu user)

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you don't need bdb, if you have filled the path to the picard jars. Just type:

ant sam4weblogo

should work.

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1
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11.1 years ago

There are many tools to convert a SAM file to FASTA:

You should be able to use one of these to convert your alignment to FASTA, and then make use of WebLogo.

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Almost there:) sam2fasta does what I want except dealing with insertions (I would like to gap reference when insertions are introduced). SamToFastq does not seem to do the alignment.

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Thank you! I will check how they deal with insertions tomorrow, I am quite curious about that.

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11.1 years ago

To solve this another way, without custom parsing (scripts do all the work for you):

  1. Grab the FASTA files for your genomic build-of-interest (e.g., grab and extract all the gzipped FASTA files for hg19 here).
  2. Convert your SAM to BED
  3. Convert the resulting BED to FASTA, incorporating the whole-genome FASTA file you made from Step 1
  4. Run the FASTA file through WebLogo to generate the sequence logo
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Thank you, interesting. Unfortunately I have no reference for my species.

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