graphical notations to represent system · pdf fileagree a standard set of graphical...
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Graphical Notations to Represent System Biology
Stuart Moodie
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Overview
• Background on Graphical Notations
• Overview of previous notations
• SBGN
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Graphical Representations - Why? • Summarise information
• Networks easier to understand visually
from Hatakeyma et al. Biochem J. (2003) 373. 451-463.
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Can this be understood by a Biologist?
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Graphical Representations - Why Not?
• Ambiguous
• Not amenable to computational analysis
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Graphical Notations: “Formalised” Pictures • Visual Language
• Rules and guidelines ensure:
• reader can unambiguously understand what writer meant
• amenable to computation manipulation/analysis
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Classic Example
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Pathways are not Electronic Circuits
• Circuits designed by humans – Follow a defined set of rules – Boundaries well defined
• Pathways – Don’t know all the “rules” – Boundaries not clear – Knowledge often incomplete
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Graphical Notation • Has an underlying conceptual abstraction
• a model of its world
• Visual Language
• vocabulary (symbols/glyphs)
• syntax (basic assembly or glyphs)
• grammar (rules based on meaning - semantics)
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Notation Example • Abstraction
• biochemical reactions
• enzymes omitted
• net flow of reactions in vivo
• Language
• Symbols
• Syntax
• Semantics
• Names only used once
• Compounds cannot be orphaned
• Arrows must be connected at both ends
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Types of Graphical Notation
• Entity Relationship – Protein Interaction Diagrams – MIM (Kohn) – SBGN-ER
• State Transition/Process – EPN – PDN (Kitano) – SBGN-PD
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Overview of Pre-SBGN Notation
12
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Entity Relationship View
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MIMs
• Inspired by circuit diagrams • Invented by Kurt Kohn, NIH • First published 1999 • Presented to SBGN by Marit Aladjem
• Slides taken from Aladjem presentation at SBGN-1
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D N A ( o r i )
Cyclin A/B Cdk1
Assembly of a multimolecular complex: ORC, the origin recognition complex
(involved in cell cycle regulation)
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Multi-protein complexes
A B
C
The complex of (A&B) & C
Each molecule appears only once per diagram. Interaction outcomes - complexes or modified molecules - are depicted as nodes on the interaction lines.
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Covalent modification (e.g., protein phosphorylation)
A P! P = PO4, a phosphate group
Inhibitory phosphorylation:
Phosphorylation of A blocks the kinase activity of A.
Inhibition convention B P!
Catalysis line convention
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A P!
Activating phosphorylation: The phosphorylated form of kinase A is the active form, phosphorylates B
Bar added to indicate obligatory requirement
B P!
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Catalysis
Stimulation
Stimulation required
Inhibition
Binding (non-covalent)
Bond cleavage (e.g. Phosphatase)
Covalent Modification (e.g. phosphorylation)
Transcription/translation
Degradation
Stochiometric Conversion (A to B)
A B
Dimerization A Transport A
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MIMs
• Benefits – Compact – Established – Useful to biologists
• Drawbacks – Learning curve – No tool support
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State Transition Diagrams
• PDN & EPN
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State Transition/Process Diagrams
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• Slides taken from Kitano presentation at SBGN-1
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PDN (Kitano Notation)
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http://www.nature.com/nbt/journal/v23/n8/abs/nbt1111.html
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EGF Receptor Cascade
Oda, et al. Molecular Systems Biology, 2005
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PDN (Kitano) Notation • Benefits
– Simple – easy to learn – Maps easily to SBML – Established – Tool support (CellDesigner, EPE)
• Drawbacks – Verbose (takes up a lot of space) – Need to know pathway in detail
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Edinburgh Pathway Notation (EPN)
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State Transition/Activation
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Logic Gates
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Complex Formation
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Gene Regulation
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Localisation
Outside
Inside
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Symbols
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Innovations • Permitted arbitrary “logical states”
• Comprehensive use of logic gates
• Workable description of gene regulation
• Use of state description language: P@S727
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SYSTEMS BIOLOGY GRAPHICAL NOTATION
www.sbgn.org
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SBGN (www.sbgn.org) • Aims
• Agree a standard set of graphical notations for systems biology
• Encourage tool support for SBGN
• Encourage community usage
• Initiated by:
• Kitano, SBI
• Le Novere, EBI
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SBGN Governance • 5 Editors who write the specs and coordinate
• Nicolas Le Novere (EBI)
• Huaiyu Mi (SRI)
• Stuart Moodie (UofE)
• Falk Schreiber (MLU Halle-Wittenberg)
• Emek Demir (MSKCC)
• 5 Member Scientific Committee
Annual Hackathon (Spring 2010 in Germany)
Annual Forum Meeting (Edinburgh Oct 2010)
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A Systems Biology Graphical Notation
1. Unambiguous
2. Parsimonious (NL)
3. Computationally tractable
4. Can be hand drawn
5. Follows accepted conventions where-ever possible
6. Can be printed and reproduced in black and white
7. Allows for incomplete information
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SBGN 3 Languages
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SBGN: Process Description
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Process-flow abstraction
from Loewe, Moodie & Hilston CompMod 2009.
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Process Flow
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Complex Formation
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Summarising information: Logic gates
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Reducing complexity: Sub-Maps
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Redundant EPNS: Cloning
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Why Cloning is Necessary
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Relating to the “Outside World”: Perturbation/Observable
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Redundant EPNS: Cloning
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Reducing complexity: Sub-Maps
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Process Diagram Examples
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MAPK
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Insulin Signalling
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SBGN-Entity Relationship Diagram
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A Simple Example
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ER Example
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Current Status • 5 workshops since Feb
2006
• Specification for Process Notation Level1: • Released Level 1 in August
at ICSB 2008
• ER Level 1 Specification
– Sep 2009
• AF Level 1 Specification
– Sep 2009
References
General overview of the standard:
Nat Biotechnol. 2009 27(8):735-41 (http://www.nature.com/nbt/journal/v27/n8/abs/nbt.1558.html)
Specification documents:
• PD: doi:10.1038/npre.2009.3721.1 (http://precedings.nature.com/documents/3721/version/1)
• ER: doi:10.1038/npre.2009.3719.1 (http://precedings.nature.com/documents/3719/version/1)
• AF: doi:10.1038/npre.2009.3724.1 (http://precedings.nature.com/documents/3724/version/1)
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Activity Flow
• Describes changes in “activity”
• Good providing overview
• “Lossy”
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Example