I have some more query for which I need some suggestions, I am new to GATK and want to use it for my exome sequencing data analysis. I have been a bit lost reading all the blogs , comments and the technical forums. So here is something I want to say and please correct and guide me through the procedure. I have downloaded the hg19 files from the UCSC browser and created the reference genome but do I need to again use the one which is there in GATK repository and then align my samples for downstream analysis? Also I want to run the GATK in my institute cluster. So if am not wrong I should create the directory of the latest GATK version and transfer all the necessary files via Filezilla in the cluster directory with the same name. Now this I have already done. So next thing is to download the bundle from the repository where I see 2 versions , so which one should I download? 2.5 or 2.3? Also once I download the bundle do I have to download anything else? So here it is which I should be downloading right in my cluster. The jar file and the resource folder with the .java files and then in the main directory of the GATK version folder in my cluster I should download the bundle version (2.5 or 2.3) and then unzip all the files that are there in the bundle directory. Right? Please let me know. Then I should be ready to use the GATK for the different downstream processes listed below:
Identify target regions for realignment (Genome Analysis Toolkit) ->Realign BAM to get better Indel calling (Genome Analysis Toolkit) ->Reindex the realigned BAM (SAM Tools) ->Call Indels (Genome Analysis Toolkit) ->Call SNPs (Genome Analysis Toolkit)->View aligned reads in BAM/BAI (Integrated Genome Viewer)
Also I would like to ask about the step of MarkPCR Duplicates, is it necessary to do it downstream as in some threads I see they do the variant callnig without it as well. I am trying to set up a pipeline for myself with a single sample (paired -end) and test it end to end and then will use this pipeline once I receive my samples of the facility.
Please let me know if this looks correct or not. The VCF files from the 1kG and the DBSNP are already there in compressed form in the bundle repository of the GATK website which I am currently downloading and I can use them directly after unzipping them