Molecularbiologyhasuntilnowmainlyfocussedonindividualmolecules,on theirpropertiesasisolatedentitiesorascomplexesinverysimplemodelsystems. However,biologicalmoleculesinlivingsystemsparticipateinverycomplexn- works,includingregulatorynetworksforgeneexpression,intracellularmetabolic networksandbothintra-andintercellularcommunicationnetworks. Suchn- worksareinvolvedinthemaintenance(homeostasis)aswellasthedi?erentiation ofcellularsystemsofwhichwehaveaveryincompleteunderstanding. Nevertheless,theprogressinmolecularbiologyhasmadepossiblethedetailed descriptionofthecomponentsthatconstitutelivingsystems,notablygenesand proteins. Large-scalegenomesequencingmeansthatwecan(atleastinpr- ciple)delineateallmacromolecularcomponentsofagivencellularsystem,and microarrayexperimentsaswellaslarge-scaleproteomicswillsoongiveuslarge amountsofexperimentaldataongeneregulation,molecularinteractionsand cellularnetworks. Thechallengeofthe21stcenturywillbetounderstandhow theseindividualcomponentsintegrateintocomplexsystemsandthefunction andevolutionofthesesystems,thusscalingupfrommolecularbiologytos- temsbiology. Bycombiningexperimentaldatawithadvancedformaltheories fromcomputerscience,"theformallanguageforbiologicalsystems"tospecify dynamicmodelsofinteractingmolecularentitieswouldbeessentialfor:(i)- derstandingthenormalbehaviourofcellularprocesses,andhowchangesmay a?ecttheprocessesandcausedisease-itmaybepossibletocorrelategenetic propertiesandsymptomsinnewandmoree?cientways,basedonanactual- derstandingofhowvariousprocessesinteract;(ii)providingpredictabilityand ?exibilitytoacademic,pharmaceutical,biotechnologyandmedicalresearchers studyinggeneorproteinfunctions. Inparticular,itmaysavetimebyreducing thenumberofexperimentsneeded,ifinadequatehypothesescanbeexcludedby computersimulation. Inresponsetothecallforpapers39weresubmittedtoCMSB2003. Allthe submittedpaperswerereviewedandtheprogrammecommittee(listedbelow) selected11high-qualitypapersforpublicationinthisvolume. Thecareofthe reviewersandoftheprogrammecommitteemembersinreviewingthepapers wassurelyvaluable. Afurther11paperswereselectedonlyforpresentationat theworkshopinordertostimulatediscussions(anabstractisincluded). AttheworkshopEhudShapiroandMichaelSterngavetwoinvited talks whosetopicsaredescribedinpapersincludedinthisvolume. Theprogramme committeedecidedtoacceptforpublicationinthisvolumealsosomeposition papers that highlight the research trends in this new ?eld of computational methodsinsystemsbiology. Thereasonisthatbecausethisisthe?rstedition ofaworkshopinthisfast-growing?eldalargeviewofpotentialtopicsofresearch wasconsideredextremelyimportant. Rovereto,December2002 CorradoPriami ProgrammeCommitteeofCMSB 2003 CorradoPriami(Chair),UniversityofTrento(Italy), CharlesAu?ray,CNRS,Villejuif(France), CosimaBaldari,Universit`adiSiena(Italy), AlexanderBockmayr,Universit¿eHenriPoincar¿e(France), LucaCardelli,MicrosoftResearchCambridge(UK), VincentDanos,Universit¿eParisVII(France), PierpaoloDegano,Universitad ` iPisa(Italy), Francois ¿ Fages,INRIA,Rocquencourt(France), DrabløsFinn,NorwegianUniversityofScienceandTechnology,Trondheim(N- way), MonikaHeiner,BrandenburgUniversityofTechnologyatCottbus(Germany), InaKoch,UniversityofAppliedSciencesBerlin,(Germany), JohnE. Ladbury,UniversityCollegeLondon(UK), PatrickLincoln,SRI(USA), SatoruMiyano,UniversityofTokyo(Japan), GordonPlotkin,UniversityofEdinburgh(UK), SimonPlyte,PharmaciaCorporation(Italy), AvivRegev,WeizmannInstituteofScience(Israel), MagaliRoux-Rouqui¿e,BSMIPasteurInstitute(France), VincentSchachter,HybrigenicsParis(France), MasaruTomita,KeioUniversity(Japan), AdelindeUhrmacher,UniversityofRostock(Germany), AlfonsoValencia,CNB-CSIC,CentroNacionaldeBiotecnologia(Spain), OlafWolkenhauer,UMIST,Manchester(UK) Local Organizing Committee Corrado Priami, Linda Brodo, Michela de Concini, Debora Schuch da Rosa Machado,andtheUniversityofTrentoEventsandMeetingsO?ce. List ofReferees F. Abascal,N. Chabrier,A. Cimatti,M. Curti,M. D. Devignes,S. Gnesi, J. Guijarro,K. Hafez,E. Klipp,C. Laneve,P. LopezRomero,F. Luccio, R. Marangoni,M. Padron,M. C. Pinotti,R. Rizzi,S. Tini. Acknowledgement TheworkshopwassponsoredandpartiallysupportedbytheUniversityofTrento, ComunediRovereto,APT,andtheEUprojectIST-32072-DEGAS. Table of Contents IInvitedPapers CellsasComputation. 1 AmitaiRegevandEhudShapiro FormalModelingofC. elegansDevelopment:AScenario-BasedApproach . 4 Na'aman Kam,David Harel,Hillel Kugler, RamiMarelly, AmirPnueli, E. JaneAlbertHubbard, andMichael J. Stern IIRegularPapers Causal?-CalculusforBiochemicalModelling . 21 Michele Curti,Pierpaolo Degano, andCosima Tatiana Baldari GraphsforCoreMolecularBiology . 34 Vincent Danos and Cosimo Laneve ContributionofComputationalTreeLogic toBiologicalRegulatoryNetworks: ExamplefromPseudomonasAeruginosa. 47 SabinePeresandJean-PaulComet ModelingCellularBehaviorwithHybridAutomata: BisimulationandCollapsing. 57 Marco Antoniotti, Bhubaneswar Mishra, Carla Piazza, Alberto Policriti, andMarta Simeoni MultiscaleModelingofAlternativeSplicingRegulation. 75 Damien Eveillard, Delphine Ropers,Hidde deJong,Christiane Branlant, andAlexanderBockmayr AMethodforEstimatingMetabolicFluxes fromIncompleteIsotopomerInformation. 88 JuhoRousu,AriRantanen,HannuMaaheimo, Esa Pitk¿ anen, KatjaSaarela, andEsko Ukkonen DynamicBayesianNetworkandNonparametricRegression forNonlinearModelingofGeneNetworks fromTimeSeriesGeneExpressionData. 104 SunYongKim, SeiyaImoto, andSatoru Miyano VIII Table ofContents DiscreteEventSimulationforaBetterUnderstanding ofMetaboliteChanneling-ASystemTheoreticApproach. 114 Daniela Degenring,Mathias Rohl, ¿ andAdelinde M. Uhrmacher MathematicalModelingoftheIn?uenceofRKIP ontheERKSignalingPathway. 127 Kwang-HyunCho, Sung-YoungShin, Hyun-WooKim,Olaf Wolkenhauer, Brian McFerran,and WalterKolch AMethodtoIdentifyEssentialEnzymesintheMetabolism: ApplicationtoEscherichia Coli.
