Progress in modeling biological development as it bears on SBML
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1 Progress in modeling biological development as it bears on SBML Eric Mjolsness UC Irvine representing the Computable Plant project
2 Three relevant examples Meristem maintenance by Wuschel Phyllotaxis mechanical network Molecular complexes
3 Example: Arabidopsis Shoot Apical Meristem (SAM)
4 WILD TYPE clavata3 mutant
5 Fletcher et al., Science v. 283, 1999 WUS Brand et. al., Science 289, , (2000) CLV3 CLV1?
6 CLV3/WUS networks for meristem maintenance Jönsson et al., Bioinformatics 21(Suppl. 1):i232-i240 June 2005.
7 WUS network simulation (2D template) Cell volumes, wall areas, and neighbors from template Template Jönsson et al., Bioinformatics 21(Suppl. 1):i232-i240 June Simulation
8 Phyllotaxis
9 SAM growth imagery PIN1 cell walls Venu Reddy, Caltech
10 Regulatory and Mechanical Networks, Coupled Regulated cell division, spring abt constants Adjacency + cell signaling T ab Λ ij
11 Dynamic Phyllotactic Model Reaction rules : Emergence of new extended, interacting objects: floral meristem primordia. DG s at 3 scales: - molecular; - cellular; - multicellular. H. Jönnson, M. Heisler, B. Shapiro, E. Meyerowitz, E. Mjolsness - Proc. Nat l Acad. Sci. 1/06
12 MAPK/Scaffold Modeling Input(s) MAPKKK (K 3 ) MAPKK (K 2 ) MAPK (K 1 ) Output Scaffold Concentration, micom "Control" K4 can form complex with K3 in scaffold Phosphateses act on kinases in scaffold First and second phosphorylation rates are equal Shapiro et al., 1 st Int. Conf. Systems Biology, 2000
13 Reactions in Scaffolded MAP Kinase Cascade Phosphorylation in Solution K ai+1 i+1 j K i Ph i K i j +1 Binding to Scaffold i = 1,,n 1, j = 0,,a j 1 { j S p1,, p i =ε,, p n + K i S p1,, p i = j,, p n }, p i = ε,0,1,,a i, i j 0,1,,a i, i = j Phosphorylation in Scaffold { S p1,, p i 1= j<a p i 1, i =a i,, p n + K S } p1,, p i 1= j+1, p i =a i,, p n { S p1,, p i 1= j<a p i 1, i =a i,, p n S } p1,, p i 1= j+1, p i =a i,, p n
14 Code Autogeneration Data Flow Cellerator SBML Automatic Code Generator iteration Experiment Results Inferencer Rule Segmenter & Optimizer C ++ Source Code Solver/ Application Compile/Link Application Code Writer Executable Simulation Experiment Design Prediction
15 Fundamental modeling issues: How to specify Structure of the existence and interactions of state variables Structure meaning low Kolmogoroff complexity, via generative procedure Eg. Wuschel; auxin/pin1 multicellular reaction rules ; Ste5 reaction rules Dynamics of the existence and interactions of state variables Eg. auxin/pin1 phyllotaxis model, weak spring mechanics Eg. many rarely-occurring reactions
16 Relevant Theory: Semantic Maps for Dependency diagrams (DD s; prob. models) Graph automata (GAA s?) Dynamical grammars (DG s)
17 DD Link Types Link type BN and MRF links Index links ι (from index nodes) Interaction gating links γ Node existence, ε Constraint, δ Purpose Probabilistic models Replicate variables and interactions Gate an interaction based on other variables Gate all interactions of a node; finish vbl-structure system definition. Eg: parse tree. [From γ] Impose constraints on random variables and index values e.g. sphere; constraint nets d/a d/a γ
18 Graph Automata Boltzmann distributions E(G,x) with detailed-balance dynamics. Conjecture: a general form is: optionally: + Example: weak spring model Bhan and Mjolsness, Complexity 11(6), 2006
19 Weak spring mechanical model
20 A Modeling Language for Biological Development Dynamical Grammars formal language, eg.: A(x) B(y) + C(z) with ρ f (x, y, z) B(y) + C(z) A(x) with ρ r (y, z, x) x,y,z can be static indices and/or variables (new) Semantics: events & XDEs --> time evolution generators H; exp th Implementation: Plenum [Mjolsness and Yosiphon 2006] Generalizes Cellerator to multiscale dynamics, via various hybrids (ICSB math tutorial notes) 1-page reimplementation of weak spring tissue model with cell division parameters can include indices => index-matching rules
21 Plenum Example: Anabaena Prusinkiewicz et al. model G. Yosiphon, SISL, UCI
22 Summary Developmental examples Meristem maintenance model Phyllotaxis model (weak spring mechanics) Molecular complex models Core modeling issues Structure of state vbl existence & interaction Dynamics of state vbl existence & interaction Theory: Semantics for DD links: indexing, gating, existence Graph automata (no static indices) Dynamical grammars (no static indices)
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