Springer Molecular Analysis of B Lymphocyte Development and Activation: 290 (Current Topics in Microbiology and Immunology, 290)

TheBlymphocytelineagerepresentsaleadingsystemforexploring- lecularmechanismsthatunderliecellfatespecification,differentiationand cellular activation. In the past five years major advances have been achievedintheanalysisofearlyBcelldevelopment,AIDdependentclass switchrecombinationaswellassomatichypermutationandBlimp-1re- latedplasmacelldifferentiation. Manyofthesefindingsandtheirimpli- tionsarecoveredinthisvolume. Twoemergentareasofresearchthatare includedinthecontributionsfocusonthepre-BCRandIkaros-familyp- teins. Thepre-BCRisanunusualmoleculardevicethatisusedtoexecute acriticaldevelopmentalcheckpointintheBlineage. Itsmechanismof- tion in relationto the pre-TCR and the mature antigen receptors (BCR, TCR)isofconsiderableinterest. Ikaros-familyproteinsappeartofunction viarecruitingtargetgenestodomainsofcentromericheterochromatinin the nucleus. Initially discovered in lymphocytes, they represent a novel system of gene regulationvia nuclearcompartmentalization. Finally, the volumeincludesachapteronWntsignalinginlymphopoiesis. Analysisof thisevolutionallyconservedpathwaywhichregulatescellularproliferation anddifferentiationindiversedevelopmentalcontextsbenefitedenormo- lyfromthediscoveryoftheLEF/TCFfamilyoffactorsinlymphocyticl- eages. ThisvolumeisdedicatedtothememoryofEugeniaSpanopoulou,ac- leagueandahighlyvaluedmemberofourscientificcommunity. Itc- tainsachapteronthebiochemistryofV(D)JrecombinationthatEugenia co-authoredwithDavidSchatz. Obituary Eugenia Spanopoulou was an extraordinary person and scientist. Her enormousintelligenceandenergysparkedimportantscientificdiscoveries, andvaultedhertoapointofbreathtakingpotential-apotentialabruptly erasedattheageof37withthecrashofSwissairflight111onSeptember 3,1998. Lostwithherwereherhusband,AndrewHodtsev,andyoungson, Platon. Eugeniawaspassionatelyinterestedinunderstandingthemolecular- sisofdevelopmentandchoseashermodelsystemthedevelopmentofB andTlymphocytes. Shebeganbystudyingthetranscriptionalregulation oftheTcell-specificgene,Thy-1,asagraduatestudentinFrankGrosveld s labatMillHill,London. Thereafter,sheturnedherattentiontothetopicof V(D)Jrecombination,firstasapostdoctoralfellowwithDavidBaltimore attheWhiteheadInstituteinCambridge,Massachusettsandsubsequently inherownlaboratoryatMountSinaiSchoolofMedicineinNewYorkCity. Eugeniamadefundamentaldiscoveriesconcerningthebiochemicalme- anismofthisreaction,andhowdefectsinitscentralenzymaticcom- nents,RAG1andRAG2,canleadtoahumanseverecombinedimmuno- ficiencydisorder,knownasOmennsyndrome. Atthetimeof herdeath, shehadbeenaHowardHughesMedicalInstituteinvestigatorforlessthan ayear,buthadalreadyassembledalaboratoryof15peopleworkingonan extensivearrayoftopicsinearlylymphocytedevelopmentandV(D)J- combination. Eugenialivedeachmomentofherlifewithanintensityfittingforthe cityinwhichshelived. LikeManhattan,shesleptlittle. Sheexpectedagreat dealofherself,andonlyalittlelessfromthosewithwhomsheworked. - geniaalsohadhighexpectationsforthescientificprocessandwasouts- keninherpraiseorcondemnationofthosewhometorfellshortofthose expectations. Shewasquicktoformanopinionanddevotedherselffe- ciouslytofriendshipsandhypotheses. PerhapsthegreatesttestimonytoEugeniaistheaffectionandreverence feltforherby themembersof herlab. Whilethisstemmedinnosmall partfrompredictablesources-herkeenmindandbroadknowledge-it founditsdeepestsourceinEugenia sabilitytotransmit,byexampleand word,her love of a life of learning and exploration. SandroSantigata,a graduatestudentinEugenia slab,capturedthiseloquentlyatthememorial serviceforEugeniaandAndrew,whenhesaid: VIII Obituary "Ifyouhaveeverbeenspellboundbyagreatstatue,enrapturedbyits strengthandvitality,enthralledbyitspurity,purposeandgraceandupli- edbythesenseofhopethatitsparkswithinyoursoul,thenyouhave- readyunderstoodwhyIadoredEugenia. Shesimplyembodiedtheideal- ticprinciplesthatformthecoreofadedicatedgraduatestudent sheart. Andtoseethesevaluesmaterializedintheformofone smentorcanbe nothingshortofinspirational. " ListofContents GeneRegulatoryNetworksOrchestratingBCellFateSpecification, Commitment,andDifferentiation K. L. Medina*H. Singh...1 Helix-Loop-HelixProteinsinLymphocyteLineageDetermination B. L. Kee...15 Ikaros-FamilyProteins:InSearchofMolecularFunctions DuringLymphocyteDevelopment B. S. Cobb*S. T. Smale...29 BiochemistryofV(D)JRecombination y D. G. Schatz*TheBlymphocytelineagerepresentsaleadingsystemforexploring- lecularmechanismsthatunderliecellfatespecification,differentiationand cellular activation. In the past five years major advances have been achievedintheanalysisofearlyBcelldevelopment,AIDdependentclass switchrecombinationaswellassomatichypermutationandBlimp-1re- latedplasmacelldifferentiation. Manyofthesefindingsandtheirimpli- tionsarecoveredinthisvolume. Twoemergentareasofresearchthatare includedinthecontributionsfocusonthepre-BCRandIkaros-familyp- teins. Thepre-BCRisanunusualmoleculardevicethatisusedtoexecute acriticaldevelopmentalcheckpointintheBlineage. Itsmechanismof- tion in relationto the pre-T