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Genome Browser

Genome Browser. Markus Krummenacker Bioinformatics Research Group SRI, International Q1 2017. Navigator Genome Browser. The Pathway Tools Navigator allows you to browse the replicons (chromosomes or plasmids) of your PGDB. Can be accessed a few different ways:

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Genome Browser

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  1. Genome Browser Markus Krummenacker Bioinformatics Research Group SRI, International Q1 2017

  2. Navigator Genome Browser • The Pathway Tools Navigator allows you to browse the replicons (chromosomes or plasmids) of your PGDB. • Can be accessed a few different ways: • Click on the Replicons or Transcription Units listed on an organism's summary page • Click on the button by the base pair coordinates of a gene display • Menu: Chromosome --> Enter Genome Browser

  3. The Genome Browser

  4. Browser Navigation • The full-length, low-resolution chromosome map is shown at the top, with the selected region in red. • Several wrapping lines from the selected region are shown below, in higher resolution. • Navigation: • Click on the top, low-resolution chromosome map • Specifying the start & end base-pair positions • Entering a gene name • Navigation arrows

  5. Navigation Features

  6. Browser Diagram Features • Gene blocks with arrows pointing from 5' to 3' • ORFs for proteins have symmetrical arrowheads • RNA genes have asymmetrical arrowheads • Phantom or pseudo-genes are crossed out • Genes wrapping around line have 'zig-zag' • Genes assigned to transcription unit (TU) are colored • Grey boxes in background also signify TU membership. Greenish = experimental ev. • Promoters and terminators are also displayed • Transcription factor binding sites (red & green)

  7. Chromosome Menu • Enter Genome Browser • For PGDBs with multiple replicons • Show Sequence of a Segment of Chromosome • Sub-sequence of the replicon, or its reverse-compliment • Print Poster • Generate a wall poster-sized PostScript file with the entire genome displayed • Add External Track • Display GFF file data in genome browser context

  8. Displaying External Tracks on the Genome Browser • Externally supplied tracks can be displayed on a chromosome region using the GFF, version 2, file format. • A flexible format for displaying various kinds of data: alternate gene predictions, gene expression data, etc. • Each feature line has a start and end position, and optionally a numeric score value.

  9. How to Display External Tracks: • Menu: Chromosome -> Enter Genome Browser • Click “Show Tracks” • Menu: Chromosome -> Add External Track • Enter URL or browse local files • Can be repeated multiple times to display several data sets • 1 file corresponds to 1 “Track”, but different feature types are grouped together in separate sections

  10. Customizing Appearance ofExternal Tracks: • Per-track selector of display style • 3 main choices: horizontal, graph, and bar graph • Horizontal: rectangular, colored by the score column • Graph and bar graph: show score in vertical dimension • Bar graphs are filled solidly, to better visualize narrow features • Special syntax in header of GFF file enables assigning a color to all features of the file. E.g. ##color green

  11. Browser showing External Track

  12. The Genome Overview Omics Viewer • The maximum zoom-out level for the Genome Browser is also known as the Genome Overview • You can use the Genome Overview to get a snapshot of the overall gene content for all replicons simultaneously • It can also be used to display high-throughput biological experiment data as one of Pathway Tools' Omics Viewers

  13. Genome Omics Viewer

  14. Comparative Genome Browser • To enter, in Gene page, click on “Align in Multi-Genome Browser” • “Select Allowed Organisms” for what to compare to • Comparison only works when Ortholog-Links are present • The selected gene is centered, and aligned with Orthologs in the other PGDBs • Colors mean shared Orthologs. A dozen colors are reused.

  15. Comparative Genome Browser Display

  16. Ortholog-Links • Ortholog-Link MySQL DB is used for BioCyc WWW site • Get-Orthologs-From-SRI parameter in ptools-init.dat • http://bioinformatics.ai.sri.com/ptools/ortholog-link-setup.html • Contact ptools-support@ai.sri.com for setup

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