Annotate Structural Variants

The main purpose of the Annotate Structural Variants tool is to calculate and add Count, Coverage and Frequency annotations to structural variants from InDel tracks detected by the InDels and Structural Variants tool.

The following tracks are taken as inputs:

These are used in the calculation and for further annotation of the resulting variant track. The Count, Coverage and Frequency are calculated as follows:

Variants that are of the same type (SNV, MNV, insertions or deletions) are collapsed into a single variant if the breakpoints supporting the variant are within 20 bp and the calculation is performed on the consolidated variant.

Coverage for tandem duplications:

Tandem duplications are insertions. For coverage of insertions, the reads overlapping the two positions before and after the insertion are considered. One breakpoint is the same as the insertion and so no new information is derived from this. The other breakpoint is at the other end of the detected duplicated interval, adding two relevant positions (before and after this breakpoint). So, for example, the coverage of a tandem duplication of length 40 at position 100 would be the number of mapped reads overlapping one or more of the following positions: 99, 100, 139, and 140.

Annotations from the Breakpoint track that are added to the variants are: p-value, Unaligned, Unaligned length, Perfect mapped, Not perfect mapped and Ignored mapped.

To run the Annotate Structural Variants tool, go to:

        Tools | QIAseq Panel Expert Tools (Image qiaseq_expert_folder_closed_16_n_p) | QIAseq DNA Panel Expert Tools (Image qiaseqv3_folder_open_16_h_p) | Annotate Structural Variants (Image structural_variation_detection_16_n_p)

The Annotate Structural Variants tool generates a variant track containing the same variants as the original InDel track with Count, Coverage, Frequency, and additional annotations taken from the Breakpoint track.