Multi-part TCGA BAMs?
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4.2 years ago

I'm working with TCGA WGS BAMs through the Google Cloud Platform, and I've seen that there are files where the barcode is identical, but there is an additional number appended to the filename before the .bam extension. For example,

G32450.TCGA-FD-A3N5-01A-11D-A21A-08.1.bam

G32450.TCGA-FD-A3N5-01A-11D-A21A-08.3.bam

G32450.TCGA-FD-A3N5-10A-01D-A21A-08.2.bam

G32450.TCGA-FD-A3N5-10A-01D-A21A-08.4.bam

Do these correspond to multiple parts of one BAM that should be merged before analysis? Or is this something else?

data bam cancer • 702 views
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4.2 years ago

These 2 are tumour, based on the part that I have put in bold:

  • G32450.TCGA-FD-A3N5- 01 A-11D-A21A-08.1.bam
  • G32450.TCGA-FD-A3N5- 01 A-11D-A21A-08.3.bam

These 2 are from normal tissue:

  • G32450.TCGA-FD-A3N5- 10 A-01D-A21A-08.2.bam
  • G32450.TCGA-FD-A3N5- 10 A-01D-A21A-08.4.bam

All of these, however, are from the Broad Institute, as judged by the final number 08,

Unless otherwise stated, the assumption, based on the 'rules' of naming samples, is that these are from the same aliquot (1 tumour aliquot; 1 normal aliquot).

Check the BAM [SAM] headers to see if they have also been processed in the same way. The commands used for alignment should be encoded in the header. In some situations, I've spotted TCGA BAMs from the same project aligned to different genomes.

Kevin

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