Question: cnvkit , antitarget , cn , call cnv
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gravatar for nina.naitatmane
4 weeks ago by
nina.naitatmane10 wrote:

hello, Im using CNVkit on amplicon sequencing with ion torrent. we don't have normal samples. and antitargets are not really helpfull in our situation, i have big insertion and no deletion in results . Is cnvkit still usefull? Can we use cnvkit without antitarget ?

call command gives as a new element cn , what does it represent in real ? and why do I have cn cn1 cn2 in my results ? thank you so much for your help

cnv • 109 views
ADD COMMENTlink modified 4 weeks ago by Eric T.1.7k • written 4 weeks ago by nina.naitatmane10
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gravatar for Eric T.
4 weeks ago by
Eric T.1.7k
San Francisco, CA
Eric T.1.7k wrote:
  1. Yes, you can use CNVkit with targeted amplicon sequencing data: http://cnvkit.readthedocs.io/en/stable/nonhybrid.html#targeted-amplicon-sequencing-tas
  2. The cn column is the estimated absolute copy number, assuming diploid cells. The cn1 and cn2 columns are allele-specific copy number, assuming you've provided a VCF file. Details: http://cnvkit.readthedocs.io/en/stable/pipeline.html#call
ADD COMMENTlink written 4 weeks ago by Eric T.1.7k

thank you, this helped me. how can interpret results, biologists on my lab are looking only for MET gen and its CNV ? thank you again

ADD REPLYlink written 4 weeks ago by nina.naitatmane10

To clarify: CNVkit will work properly on targeted gene panels of at least 5 genes or so. If you're only sequencing one gene, the total copy number information will always be neutral (log2 = 0) because of normalization. But you can still look at b-allele frequency (the baf column in call output) to detect allelic imbalance, which would indicate a copy number alteration. Typically a lab would use FISH to determine a single gene's copy number.

ADD REPLYlink written 4 weeks ago by Eric T.1.7k
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