some problems I meet when running Bismark+DMAP
1
0
Entering edit mode
10.0 years ago
hua.peng1314 ▴ 100

Hi,

I meet some problem when running Bisnark+DMAP,The data I use is the [Test dataset 1 for DMAP](http://biochem.otago.ac.nz/assets/software/test_MDS_data_large.tar.gz) from http://biochem.otago.ac.nz/research/databases-software/

The commands I used are:

bismark_genome_preparation ./
bismark -q -n 1 -l 40 ~/projects/Methylation/BS_seq/reference1/ ../MDS_chr1_maps.fastq
bismark_methylation_extractor -s --bedGraph --counts --buffer_size 10G --cytosine_report --genome_folder ~/projects/Methylation/BS_seq/reference1/ MDS_chr1_maps.fastq_bismark.sam
diffmeth -e 40,220 -g ~/projects/Methylation/BS_seq/reference1/Homo_sapiens.GRCh37.75.dna.chromosome. -R MDS_chr1_maps.fastq_bismark.sam |awk -f ~/software/meth_progs_dist/src/getcpgpcmeth.awk >diffmeth.single.MDS.list

So I get two files -- the MDS_chr1_maps.fastq_bismark.CpG_report.txt and the diffmeth.single.MDS.list,In the former I get these information:

1       10469   +       0       0       CG      CGC
1       10470   -       0       0       CG      CGA
1       10471   +       0       0       CG      CGG
1       10472   -       0       0       CG      CGC
1       10484   +       0       0       CG      CGG
1       10485   -       0       0       CG      CGG
1       10489   +       0       0       CG      CGC
1       10490   -       0       0       CG      CGG
1       10493   +       0       0       CG      CGC
1       10494   -       0       0       CG      CGG
1       10497   +       43      8       CG      CGG
1       10498   -       0       0       CG      CGG
1       10525   +       47      5       CG      CGC
1       10526   -       58      11      CG      CGG
1       10542   +       48      4       CG      CGA
1       10543   -       63      7       CG      CGG
1       10563   +       40      12      CG      CGC
1       10564   -       64      6       CG      CGT
1       10571   +       46      5       CG      CGC
1       10572   -       64      5       CG      CGG
1       10577   +       0       0       CG      CGC
1       10578   -       44      25      CG      CGA
1       10579   +       0       0       CG      CGG
1       10580   -       39      30      CG      CGC
1       10589   +       0       0       CG      CGG
1       10590   -       63      5       CG      CGG

and the latter:

1       10497   84.31
1       10525   86.78
1       10542   90.98
1       10563   85.25
1       10571   91.67
1       10577   63.77
1       10579   56.52
1       10589   92.65
1       10609   -
1       10617   -
1       10620   -
1       10631   -
1       10633   -
1       10636   -
1       10638   -
1       15720   -
1       15749   -
1       15769   -
1       15789   -
1       15834   -
1       15849   94.74
1       15865   94.74
1       15882   100.00
1       15912   94.74
1       17562   100.00

I don't know how to explain the differences between them such as 10577. Have I done anything wrong or it's a real bug in the software?

Moreover,the latter I think just show me the cytosine on the + strand.if right how could I get the information about the - strand.If not how could I get the information about the strand directly? I see the introduction of the options and the but couldn't get any help.

Thanks for your help

RRBS DMAP Bismark • 2.7k views
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You're piping things through an awk script before writing that file. What's in the awk script? Perhaps that's causing weird results (and anyway, it's hard to know what the 3rd column even means without more information).

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0
Entering edit mode
10.0 years ago
hua.peng1314 ▴ 100

I find the answer when I read the paper again and use the R package MethylKit. The DMAP result is depend on the both strand and the bismark depend on just one strand.For example,the

1       10577   +       0       0       CG      CGC

and the

1       10577   63.77

They seem different.But the

1       10578   -       44      25      CG      CGA

agrees with the

1       10577   63.77

And this is also the answer for my second question.

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