How I learned to quit worrying Deanna M. Church Staff Scientist, Short Course in Medical Genetics 2013 And love multiple coordinate.

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Presentation transcript:

How I learned to quit worrying Deanna M. Church Staff Scientist, Short Course in Medical Genetics 2013 And love multiple coordinate systems

Alternate loci/Patch RefSeqGene/LRG Transcripts (NM_XXXXXX.X) Proteins (NP_XXXXXX.X) * Not drawn to scale

Software v1.4 Different versions of same assembly to each other (e.g. NCBI36 GRCh37) Different assemblies from same organism to each other (HuRef GRCh37)

Producing Assembly-Assembly Alignments First Pass Alignments: Symmetrical best hits- only 0 or 1 alignment to the other assembly. Second Pass Alignments: attempt to recover regions not in the first pass Uses assembly structure to guide first pass alignments

NCBI36 GRCh37 Remap failure: low coverage (<50%) 100 bp GRCh37 NCBI bp Remap failure: expansion (target length/source length >2)

Helps rescue features that cross a gap (common for CNVs/Structural Variants)

Beware: Second Pass alignments and Merge

Remap Output Summary data: Quick overview of how well your features mapped Mapping report: Detailed report containing all of your input features and their source location, target location (or reason for failure) and coverage score. Annotation File: An annotation file of only the features that successfully remapped. Suitable for loading to most browsers. Genome Workbench file: A file formatted for loading to Genome Workbench (a client side browser). Includes assembly-assembly alignments for review. Genome Workbench videos

* LRG soon When mapping to RefSeqGene Genomic location (NG_XXXXXX.X) Transcript location(s) (NM_XXXXXX.X) Protein location(s) (NP_XXXXXX.X) Optional, but checked by default No second pass alignments, only one ‘best’ alignment

Maps features: From Primary Assembly -> Alternate Loci/Patches (common) From Alternate Loci/Patches->Primary Assembly

Take home messages Tools are available for mapping features from one coordinate system to another. Assembly Assembly RefSeqGene Primary Assembly Alternate Loci/Patches Feature remapping is NOT a substitute for de novo annotation.