Comparative Analysis in BioCyc

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Presentation transcript:

Comparative Analysis in BioCyc

Comparative Genomics Tools Several ways to compare PGDB data All relevant PGDBs must be loaded into one instance of Pathway Tools Multi-organism search Compare objects across databases Compare genome regions around orthologous genes Metabolic map comparisons Web-based comparative analysis tables

Web: Second Database Selector There are two different organism selectors in BioCyc The first: found at the top of the page, selects a single organism/database The second: a multi-organism selector, used for comparative analyses Analysis → Comparative Analysis ; Choose Organisms button On gene page: Change organisms/databases for comparison operations

Save Organism Groups with Web Accounts 4 SRI International - The BioCyc Collection of Pathway/Genome Databases Workshop, ASM General Meeting, New Orleans May 2011 Methods of Searching BioCyc Save Organism Groups with Web Accounts Note My Lists tab on the multi- organism selector for comparative analyses You can save groups of organisms for re-use at a later time

Cross-Organism Search Search -> Cross Organism Search Specify Search terms Fields to search – Name and/or Summary Object types Organisms Example: Diphthamide across pathways of all archaea

Sameness of Objects Across Databases What does it mean for two objects to be the same? Compounds, Reactions, Pathways: same object ID Genes: same name or ortholog Proteins: same name

Compare Objects Across Databases Web mode Find object in one other database Gene -> Show this gene in another database [Type] -> Show this [type] in another database [Type] -> Show this [type] in MetaCyc Find object in multiple other databases [Type] -> Change organisms/databases for comparison operations [Type] -> Search for this [type] in other databases Desktop mode Right-click Show -> Frame in other DB

Pathway Comparison Species Comparison in right-sidebar menu Uses current multi-organism selection Evidence glyph (enzymes for reactions ?) Green – reaction has an associated enzyme in this organism Blue – the Hole Filler has predicted an enzyme for this reaction Black – no enzyme, sorry Orange – unique: Within this PGDB, this reaction is only assigned to this one pathway Magenta – spontaneous reaction, or “other” lines (like polymerization repetition) Enzymes and associated genes list: Grouped by reaction Operons: Shows pathway genes colored dark purple in their TUs

Compare Metabolic Maps Via Cellular Overview Desktop: Overviews -> Highlight -> Species Comparison A reaction is shared between two PGDBs if, for both PGDBs: The reaction occurs spontaneously, or An enzyme is present that catalyzes the reaction If the same reaction exists as a pathway hole in two PGDBs, it will not be highlighted

Ortholog-Based Comparison Operations Orthologs in BioCyc Computed via pairwise BLAST between proteomes Orthologs are bi-directional best BLAST hits Ties broken using alignment length/identity Some BioCyc genomes lack ortholog data Orthologs drive a number of comparative operations

Ortholog-Based Comparison Operations Right-sidebar menu Show gene in other database(s) Show orthologs with operon diagrams Align in multi-genome browser Sequence alignments

Align in Multi-Genome Browser See a gene and its orthologs in their respective contexts Web Gene page: Comparison Operations → Align in Multi-Genome Browser

Web-based Comparative Analyses Generate tables comparing the presence of biological entities in different organisms Also useful as a way to obtain statistics on one organism Analysis → Comparative Analysis Select what you want to compare Select the organisms you want to compare Will generate a table with items you can click through on

Comparative Analysis Example Select Pathways and three organisms Multiple tables result Pathways by class Presence of pathway holes Each type of item (pathways, reactions, etc) has different tables Clicking on a pathway class generates a table comparing the actual pathways within that class Can then click through to cross-species comparison (like from the pathway pages)