cycle between the flagellum and its base Johanna Buisson, Nicolas Chenouard, Thibault Lagache, Thierry Blisnick, Jean-Christophe Olivo-Marin, Philippe Bastin

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Johanna Buisson, Nicolas Chenouard, Thibault Lagache, Thierry Blisnick, Jean-Christophe Olivo- Marin, et al.. Intraflagellar transport proteins cycle between the flagellum and its base. Journalof Cell Science, Company of Biologists, 2013, 126 (1), pp.327-338. ￿10.1242/jcs.117069￿. ￿hal-03246304￿

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IFT demonstrated at of transport the concentrated return pool or are and IFT52 this forward proteins with of of IFT fusions separation role automated GFP flagella. allowing actual using and method studies, the curvelet cilia flagellum about of for known construction model is the attractive little for but necessary is flagellum (IFT) transport Intraflagellar Summary 10.1242/jcs.117069 doi: 327–338 126, ß Science Cell of Journal 2012 August 30 Accepted ( correspondence for *Author 2 1 Kzisie l,19;Aslne l,20;Pgn ta. 2009). al., from et Pigino purified 2008; microtubules were al., et They peripheral Absalon 1995; the al., the et between (Kozminski and positioned membrane granules electron flagellum a transmission electron-dense by by visualised as and are microscopy particles 1995) IFT 2007). al., al., et et (Rompolas (Kozminski orientation retrograde anterograde the tip) in the complex dynein in to specialised family base II (from the of direction motors by driven is IFT ye Fli ta. 06 bao ta. 08 rne l,2008) al., for et available Tran only 2008; is al., investigation in et cell Absalon detailed few of 2006; to and al., limited (only et are movement (Follit observations these types However, membrane (Orozco the 1999). protein al., fluorescent a et as to flagellum fused components IFT cells individual the live Chlamydomonas deforming in particles microscopy to 2003). al., contrast et protists Kohl 2003; from al., et Huangfu far, 2000; al., al., et so et Signor Pazour 1999; al., 1999; investigated et Brown 1995; species al., the et (Kozminski most mammals all of construction in perturbs in components conserved particle organelle or are motor inhibition IFT and proteins 2009) of Scholey, IFT and (Hao or species eukaryotic 1998). ciliated motors al., et (Cole encoding B and A termed complexes protein two contain uniaieIaeAayi nt ntttPseradCR R28,2 u uDcerRu,705Prs France Paris, 75015 Roux, France Docteur Paris, du 75015 rue Roux, 25 Docteur URA2582, du CNRS rue and 25 Pasteur URA2581, Institut CNRS Unit, and Analysis Pasteur Image Institut Quantitative Unit, Biology Cell Trypanosome 2 03 ulse yTeCmayo ilgssLtd Biologists of Company The by Published 2013. ofr F a endmntae ydfeeta interfering differential by demonstrated been has IFT far, So 1 u w itntppltosfratrgaemvmn htaesniiet eprtr.We hyrahtedsa i,anterograde tip, distal the reach they When temperature. to sensitive are that movement anterograde for populations distinct two but ) hayooa reinhardtii Chlamydomonas nrfaelrtasot ii n lgla Trypanosome flagella, and Cilia transport, Intraflagellar Kzisie l,19)o ymonitoring by or 1993) al., et (Kozminski ) [email protected] 1 ioa Chenouard Nicolas , 1, Chlamydomonas * Kzisie l,1993). al., et (Kozminski ) lglaadsonto shown and flagella 2 Chlamydomonas hbutLagache Thibault , F si osse ogfaelm(20 flagellum long a possesses it as IFT eakby uineet eeams wc oelkl to likely more twice almost were events flagellum. the fusion of portion populations Remarkably, same anterograde the distinct in the speed two different least with of show travelling at We selection travel. of existence to to the going the example are here possibility trains for mechanistic which the on as IFT such in doublet up aspects unsolved, opened key remain multiple that This the of 2010). some investigate al., and et anterograde ratio (Chenouard signal-to-noise of the improving discrimination significantly traffic, easy retrograde appropriate semi- and allowing up detect analysis, analysis to kymograph set automatic software upon now particles a IFT developed have track have and and We to IFT monitoring fused 2008). image complex) to by al., IFT-B conditions trypanosomes et the of (Absalon in member GFP (a IFT IFT52 of of movement visualisation first the genetics. reverse all of potent almost conservation the to demonstrated analysis amenable functional and is Genomic and structure axonemal further for importance contexts. the cellular IFT distinct highlight of in nature and investigation the revealed in studies motors and (Follit These rates cells anterograde IFT 2009). in al., cultured differences the et significant IMCD for quite Besschetnova and reported 2006; been al., LLC-PK1 mammals only et of in have IFT data Imaging and primary 2011). challenging Barr, been and has Morsci in 2004; neurons al., ciliated et of types different elegans for and 2005) (Dentler, h protist The 2 her Blisnick Thierry , hr nxetddfeecshv enrpre (Snow reported been have differences unexpected where IFT rpnsm brucei Trypanosoma ee JlosaadBsi,20) ereported We 2009). Bastin, and (Julkowska genes 1 enCrsoh Olivo-Marin Jean-Christophe , sa trciemdlt study to model attractive an is rpnsm brucei Trypanosoma m )wt typical a with m) 327 ,an m C. m 2 Journal of Cell Science Results IFT. aeat eetITtan ntefaelm 5 sexposure allowing events ms CCD anterograde 150 of a side, A detection z- with flagellum. unambiguous single the and recording the in clear a digital trains provided in IFT used on detect organelle we to Second, the camera lying acquisition 1). of (Fig. flagellum segments and glass plane long to their of stick viewing frequently visualisation with cells improved that the noticed slides to we therefore in difficult First, extremely conditions. ratio We events retrograde signal-to-noise and detect. using the low matrix was However, Images agarose flagellum 1). an (Fig. recording. in nucleus immobilisation the movie 2008). of upon exception acquired al., flagellum the in were uniformly with et the present body and at cell flagellum (Absalon the the concentration in GFP spots high elongated as in to base, found fused was complex that IFT IFT52 GFP::IFT52 the (those expressing component trypanosomes midgut) fly B procyclic the live in develop in normally visualised particles was IFT fluorescent IFT of tracking and Detection modelling mathematical the and from returning base proteins only flagellum IFT that revealed the of recycling to the flagellum time first (Pigino for demonstrate studies the experiments photobleaching other Finally, 2009). from al., et transport retrograde of the frequency and reach and size they anterograde train once between conundrum three a in solving tip, split distal are also trains We anterograde doublets. microtubule that of show number limited a on anterograde travel that trains view the supporting cases, overtaking than happen 328 ora fCl cec 2 (1) 126 Science Cell of Journal , 5 ftebslpo satvl nae in engaged actively is pool basal the of 45% fteotrdni r rPR,oeo h ancmoet of components main the of one PFR2, or arm to dynein chain fused outer intermediate was the the an GFP DNAI1, of when as of such observed proteins not subunits unpublished flagellar was structural our three IFT FAP133, contrast, and and In (two data). XBX1 IFT27- machinery DHC2.2, IFT and complex for the dynein -IFT22 as of observed components 4), proteins distinct Movie were IFTB five for material events as supplementary well IFT 1D; (Fig. retrograde GFP::DHC2.1 transport. and retrograde for chain motor fusion Anterograde heavy the dynein a DHC1b), IFT called constructed the also we and (DHC2.1, GFP IFT52, encoding to genes ensure the restricted To between 1B,C). not Fig. were both at the these images of that and length still defined whole on ms the as arrows along 100 (colour appeared followed flagellum be to then could path time particles whose spots exposure retrograde This 3). and the 2, anterograde of Movies reduction material supplementary allowed EMCCD disk 1B,C; amplified (Fig. spinning an with the camera acquired using were images illumination and laser technology under observed weak were of accurately. detect. traces tracked elongated to be not very difficult could as that remained appeared intensity events they visible, retrograde material When but supplementary 1A; 1), (Fig. traces Movie elongated as appear that 0sweetepsto ftepril smre nthe on marked is particle the the of position alongside the where s found 30 structure large data). a unpublished (our rod, axoneme paraflagellar the aeilMve5.Hwvr idrcinlITyed many yields IFT bi-directional However, the 5). on Movie projected material is time oipoesniiiy F:IT2epesn trypanosomes expressing GFP::IFT52 sensitivity, improve To yorp nlsswsnx are u nclsfle for filmed cells on out carried next was analysis Kymograph seFg n et.()ITmvmn of movement 5 IFT bars: (D) Scale text). 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Fig. A–C upeetr aeilMve –)or 1–3) Movies material supplementary , y ai Fg AB supplementary 2A,B; (Fig. -axis D upeetr material supplementary , ahrwsossilimages still shows row Each m m. x ai and -axis Journal of Cell Science s s whereas nmn ois hyrpeet47 ftettlnme of number a total ( GFP::DHC2.1 the in ( of of GFP::IFT52 detected case 4.7% for be represent trains to They anterograde movies. detected low consistently many were too (stars, on they speed but was analysis slow proportion statistical very significant Their at travelling 2D). trains Fig. of population minor lglu eeldta risdslydfs rso oin as motions slow or fast displayed trains that revealed flagellum and GFP::IFT52 the both of 67% for About (2.40 bars). films) motility grey fast showed 41 dark trains individual 3A,B, most of (Fig. The in GFP::DHC2.1 trains (71% peaks. anterograde criterion two of showed sequences that information distribution Methods) least bimodal and Bayesian Materials a at a (see 1978) using of (Schwarz, (BIC) tested existence train was of the Examination hypothesis 3). suggested 2, (Figs an dissimilar flagellum speed same demonstrated highly the exhibiting within events trains rates with anterograde complexity, of unexpected analysis frequency and Kymograph speed IFT of Quantification trypanosome the in events retrograde flagellum. and automatic of anterograde the analysis IFT reproducible and and material both robust conditions (supplementary allow acquisition kymographs hour of the an a analysis Overall, to over up S1). unaltered of Fig. were acquisition parameters of these period retrograde that and anterograde showed slide both same velocities of the Measurement of on acquired. movies medium were successive in analysis, maintained for trypanosomes amenable separate cells increase of To and below). number see larger the 2C,D, the improves by (Fig. particles masked greatly anterograde usually which brighter trains and retrograde present, of bi- longer analysis between anterograde no the points crossing are images result, of trails a sub-kymograph directional As distinct 2010). separation al., two et in the (Chenouard particles curvelet IFT permits a retrograde on that based technique a transform analysis therefore using kymograph We prevents a quantification. IFT which developed for image, procedure automatic kymograph simple the in cross-points 2 2 xmnto fcmlt rcsfo h aet h i fthe of tip the to base the from traces complete of Examination 1 1 n 0.52 and , , n 5 7,Tbe1.Mroe,w oie h rsneo a of presence the noticed we Moreover, 1). Table 271, , 3 fte ipae lwrmto (1.53 motion slower displayed them of 33% 6 0.30 m ms n 5 2 4) ihasedo 0.55 of speed a with 442), 1 respectively. , 6 0.31 n 5 m ,2)ad59 nthe in 5.9% and 1,223) ms 2 1 , n 5 5,Tbe1) Table 551, 6 6 0.30 0.24 m m m m aesedfrtecmlt neord ore,so trains slow the journey, maintained compartment anterograde complete trains flagellar the fast the for in most speed detected whereas same be However, could 2D). 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Boshart, 27 and contributor at grown main as (Engstler were they a such trypanosomes infection, differentiation where conditions, fly hosts, to during environmental different temperatures different varying two very in the encounter develop and temperature trains Trypanosomes to sensitive the is IFT of speed the the microscopy. by light imposed ms), of (100 be resolution limitations to the time have given acquisition These approximations analysis). as nm kymograph 250 taken using was movies train separate 393 retrograde that whereas was the the analysis) kymograph train of of using anterograde movies length separate the 10 The from by counterparts. left retrograde that average traces showed their on and than intensity path carry to material visible train trains compared entire IFT their anterograde of events along Calculation performed retrograde 2). was (Table of almost ones an abundance anterograde revealing flagellum, higher the of 3-fold end distal the and proximal ( n 5 h rqec fvsbeITtan a acltda ohthe both at calculated was trains IFT visible of frequency The ,2)(i.3,,lgtgrey). light 3A,B, (Fig. 1,223) rista hne pe uigterti ntefaelmand flagellum trains. the slow in very trip at their point slow during stars some speed indicate changed Arrows that C). trains as straightforward magnification for (same allowing analysis and background reducing hence neord ( 5 Anterograde bar, scale (horizontal flagellum the m axis of X length the the where to 5 corresponds Movie material supplementary highlighted from is extracted analysis 5 for bar: used Scale flagellum (arrowheads). the of portion visible oi rmwihtekmgahwsetatd ( extracted. was kymograph the which from 5 Movie anterograde of traces. separation retrograde and and generation Kymograph 2. Fig. yaiso nrfaelrtasot329 transport intraflagellar of Dynamics )adteYai oteeasdtm vria cl a:5s). 5 bar: scale (vertical time elapsed the to axis Y the and m) D n ergae( retrograde and ) ( A tl mg fsplmnaymaterial supplementary of image Still ) ˚ m suuladte incubated then and usual as C o ohiae.( images. both for m 6 E 1n ( nm 51 rcshv enseparated been have traces ) , .-odmr IFT52 more 4.1-fold 6 n 1n ( nm 51 5 6 3,fo 10 from 539, 1.01 C Kymograph ) B m The ) n ms 5 ˚ did C 505, 2 1 Journal of Cell Science atrwe el r nuae t37 travel at populations incubated All are lines. cells blue when each as faster for represented be Gaussians are can obtained population one The anterograde only transport. whereas retrograde separate transport for two anterograde identified detected for analysis trains BIC of 8). populations Movie material supplementary from ris l yorpsaesona h aemgiiain cl bars: Scale magnification. same the at 5 shown horizontal, are kymographs All trains. tr.Fnly iia .7fl nraewsntcdfor noticed of was velocity average increase spectacular 1.37-fold a 7.42 reaching similar transport a retrograde Finally, star). upeetr aeilMve n ,rsetvl)o 37 or respectively) 7, and 6 Movies material supplementary Tbe2.I otat euigtetmeauet 20 to events temperature retrograde the reducing for of contrast, pronounced frequency In more the 2). slightly in (Table was increase that an by trains accompanied was velocities nsmlrpooto hna 27 n for at detected increase than still were proportion 1.3-fold velocity similar slower in a displaying and Trains ones. trains fast the anterograde slow for increase 27 to exposed lines cell indicated temperature. the to in sensitivity and IFT retrograde ( and Anterograde 3. Fig. 330 u nweg,ti stefrtdmntaino nefc of effect an of demonstration first To shown). the not is (data this speed IFT knowledge, of our modifications visible to lead A–C 5 0)bthdafse eoiya 1.07 at velocity faster a had but 707) 6 .Sedo neord dr ry n ergae(ih ry F trains IFT grey) (light retrograde and grey) (dark anterograde of Speed ). 1.64 ora fCl cec 2 (1) 126 Science Cell of Journal m m ;vria,5s. 5 vertical, m; ms 2 1 ( n 5 4)(al ) hsaclrto fIFT of acceleration This 1). (Table 742) ˚ ˚ 56 fteatrgaetrains, anterograde the of (5.6% C C.Saspita oevr slow very some at point Stars (C). 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(Fig. trains i.4)o eue pe teso n sosdw’tefast the down’ ‘slows one, one slow slow the 4B (the Fig. ‘pushes’ speed one one, reduced fast or (the 4B) speed Fig. unchanged either to infcn osqecsfrclae el xoe ovariable have to could exposed that cells phenomenon ciliated temperatures. a for consequences velocity, significant IFT on temperature h aeo lwITtanta a vrae yoeo two or 4A one (Fig. by 3 by overtaken occasions was few that a train on IFT and being slow could trains, situation a fast common train of most frequently the case were with fast the events movies, Such most a 4A in speed. 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(Fig. IFT retrograde intensity typical cells and the were to unbleached anterograde they leading tip, with as trains, distal the retrograde particles reached to slow particles converted these and Once 5Aa). fast the (Fig. displayed of they intensity but diversity trains Their original anterograde same 5Ah). the where to (Fig. compared later visible weaker was again s detected 4 were until trains were fluorescent 5Ag) particles Fig. moment fluorescent arrowheads, that (violet From retrograde 5Af). of exclusively Fig. tip distal arrowheads, on, the (green reached flagellum particle the fluorescent anterograde 5Ad). last (Fig. the for and GFP::IFT52 area anterograde trains of of cytoplasmic mixture retrograde a pool contained the flagellum cytoplasmic the when Meanwhile, the rapid later indicating of replenished, s was dynamics on 1 recovery base of flagellum than kept sign the first surrounding less and The 5Ad). observed intensity (Fig. rates was usual fluorescence their at their before moving flagellum base new the retained fluorescent in of flagellum both present bleaching loss contrast, trains the By retrograde the immediate flagellum. and almost the anterograde of of in the trains in vicinity anterograde disappearance resulted fluorescent close This to 5Ac). in (Fig. signal also laser single base a cytoplasmic reliable by flagellum leading achieved was permitting the bleaching pulse, cases, at non-saturating, both In intensity 5B). but (Fig. fluorescence the weaker of in is quantification trains where 10 IFT signal Movie material different supplementary the the and base 5A) of flagellum (Fig. visualisation the the flagellum easy at allows saturating in is but intensity trains fluorescence where fluorescent monitor by to base, performing flagellum. flagellum by analysis was and the recovery distribution kymograph at fluorescence and intensity overall bleached examining quantifying selectively flagellum the was by at cells evaluated fluorescence such GFP of were flagellum. trains base the the where a in base conditions flagellum of acquisition detectable the in identification at the saturated signal the screening not GFP::IFT52 allowed the was of which cells in Nevertheless, them of quantification of number few large impossible. rendering a through signal, recovery base fluorescence flagellum the ae r ie in given are Rates rqece r ie snme ftan e second. per trains of number as given are Frequencies ˚ ˚ w oisaepeetd upeetr aeilMve9, Movie material supplementary presented: are movies Two .209 .133 .43.37 2.87 3.24 2.78 3.30 2.47 3.31 2.48 0.98 0.86 1.02 0.89 C C m ms , 2 rxmlDsa rxmlDsa rxmlDistal Proximal Distal Proximal Distal Proximal 01 fe lahn Fg A)until 5Ae) (Fig. bleaching after s 10–15 1 lwadfs neord riswr eaae yteBIC. the by separated were trains anterograde fast and Slow . ˚ ˚ ˚ 2 2.22 1.34 1.53 528 191 822 C C C neord A ergae()RtoR:A Ratio (R) Retrograde (A) Anterograde al .Feunyo F risi h F:IT2epesn strain expressing GFP::IFT52 the in trains IFT of Frequency 2. 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Fig. from averaged were ytkn nocnieaintelnt fteflagellum the of cycle length full (0.66*2.4+0.33*1.5 anterograde a the of for the velocity consideration in spent present into time (22.3 units the taking IFT measured of by first number we the calculate flagellum, To 5B). Fig. fti supinwr orc,oewudepc correlation a expect would one correct, were assumption this If eoeydt fteGP:F5 inla h lglu base flagellum the at signal GFP::IFT52 the of data Recovery m )(oisne l,19)dvddb h average the by divided 1995) al., et (Robinson m) yaiso nrfaelrtasot331 transport intraflagellar of Dynamics 6 6 6 , , .6727.42 4.99 5.64 742 210 1223 0.46 0.14 0.31 neord ris(i atadtreso ones, slow three and fast (six trains anterograde 9 .– Fg A upeetr aeilMve9, Movie material supplementary 5A; (Fig. s 3.5–4 , 7(7atrgaeuis1 rniiga the at transiting units+10 anterograde (27 47 , , 8so vrg bten1 o2 s 22 to 16 (between average on s 18 0rtord risaetafcigi a in trafficking are trains retrograde 10 m ms 2 n 1 ,so Chlamydomonas 6 , %o h rgnlvalue. original the of 8% . ) ihafrequency a With s). 3.5 m ms Speed 2 6 6 6 1 ,so 1.64 0.89 1.01 Qne al., et (Qin , 1s) 11 , 10 ˚ C Journal of Cell Science e lglu fvroslntsrvaigacertendency clear a shorter a with revealing a cells in lengths on from on various and of reproduced based coming flagellum was flagellum recovery new proteins experiment of full-length This fluorescent time flagellum. a of calculated with the recycling with cells cells. was agreement uni-flagellated to elapsed for observed time compared as the fluorescent range to 40 same However, reached the new base recovers in flagellum the 50%, Movie of progressively at material recovery supplementary Fluorescence emergence that 12). 5E; (Fig. base and particles anterograde the material of to return fluorescent bleaching, trains before a flagellum retrograde with the trains, retrograde within cells anterograde and present anterograde for fluorescent trains fluorescent the the observed new in of motion was of resulted for continued loss that flagellum whose flagellum: events new positive single the of flagellum of both cascade new 5E; base same has (Fig. the are a at cell presented that exclusively constructing reached the has is bodies are length where and basal examples 12), GFP::IFT52 its Two Movie duplicated material 1995). 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(10 DHC2.1 for three and movies) (20 C 1 10 losteacrt xrcino ag ubrof number large a of extraction accurate the allows 6 ˚ 6 Cor37 el mL cells 0.3 ˚ trtsof rates at C ˚ ae nPlireeet(Gorja element Peltier on based C ˚ sn w ifrn eie,atemperature a devices, different two using C 2 1 n rpe ewe ld n coverslip. and slide between trapped and m rp a ae ietyfo the from directly taken was drop) L , 6 6 1 pixels). 1 3wt . ueia aperture) numerical 1.4 a with 63 ˚ Cs 2 ˚ eeaqie neight in acquired were C 1 n rvdslong-term provides and , ˚ n 2 movies 129 and C 6 ies.For pixels). 1 ´ na ´ ze al., et cz ˚ C Journal of Cell Science nt e eoda 27 at second per units rtiscneunl oe akt h lglu aea h aetm.Uigthe Using time. same ( the at their anterograde base during flagellum the mean unchanged to back remained time comes mean trains consequently a proteins lasts IFT which flagellum, of the inside fluorescence journey the that considered pia aaee bandfrcl k. cell for obtained parameter optimal ast u ntemdladt vi vritn,b nrdcn eat emfor of term number penalty a right introducing the by select overfitting, avoid to to permits and BIC model the the in laws, put anterograde Gaussian to and laws of retrograde both sum (Schwarz, in weighted distribution BIC modes empirical cell, a the of each modelling number in Indeed, the velocities. velocities uncover IFT IFT to of used variability is (BIC) intrinsic 1978) criterion large information the Bayesian to the Due analysis: statistical analysis. rate BIC IFT the in detected not low are their trains to Due slow category. very separate these a proportion, as manually grouped and detected consistently h lglu.I atclrITfursetuisetrtefaelmwt effective with flagellum fluorescence the enter the units fluorescent that frequency IFT particular considered In flagellum. we the experiments, base t, time flagellum at photobleaching recovery the at analyse proteins IFT To of recycling the Modelling representing precisely, More model. model fitting mixture the Gaussian in a with parameters of number the neord F ae a optdb iiiigteBIC the minimising by computed was rates IFT anterograde niiulcl and cell individual parameters xeietly(al ) h length time the 1), (Table experimentally osqety h loecnercvr rate recovery fluorescence the Consequently, and h duration the where m oe odt.Te,teotmlnme fmodes of number optimal the Then, data. to model pligti nlsst h esrdITrts efudta h neord IFT anterograde the that found we ( rates, bimodal IFT measured was the to analysis this Applying 21 GP:F5 el t37 at cells EGFP::IFT52 12/16 nlsspoie h airtdparameters calibrated the provides analysis where equation: r umrsdi al 1. Table in summarised are GP:F5 (37 EGFP::IFT52 where h lglu.Fr0 For flagellum. the where i , s enparameters: Mean i k h orsodn enadvrac,w is erhd o fixed a for searched, first we variance, and mean corresponding the t p lag p L stenme ffe aaees( parameters free of number the is N (x p stenme fGusa asi h mixture, the in laws Gaussian of number the is L 1 * ( stettlnme fITpoen ntefaelmbs xhnigwith exchanging base flagellum the in proteins IFT of number total the is a ,x , ( a stemxmsdlklho the likelihood maximised the is 1 a ( 2 ~ t27 at s 4 (t). a 1 ,…,x t , i *, m P fteITfaelmti a eetmtdto: estimated be can trip flagellum IFT the of m k f 1 1 m * where , p , n 5 i X s k ~ *, ) ~ a m 1 n ˚ )i 9o h 1cls(1;1/8EF:IT2clsa 27 at cells EGFP::IFT52 13/18 (71%; cells 41 the of 29 in 2) L )adEF:DC.,rsetvl,ad.*( and respectively, EGFP::DHC2.1, and C) s r h bevdrtord rs.atrgae F ae nan in rates IFT anterograde) (resp. retrograde observed the are ; t setrl otoldb xhneo loecn aeilwith material fluorescent of exchange by controlled entirely is (t) # 1 h orsodn apesz.Cneunl,ti is tpo the of step first this Consequently, size. sample corresponding the p ::: ˚ i v a *) and C ~ ÈÉ a , 1 ; n ergae( retrograde and ) 1..p m ( a t ˚ f k a j ) ob ute rnpre oad h itltp We tip. distal the towards transported further be to C), , 1 p ~ BIC ), n , steatrgaetan rqec (f frequency trains anterograde the is , s htmxms h likelihood the maximise that m t 1 a 1 nypr loecn atce,ta eeit the into were that particles, fluorescent pure only , , "# p d 2 , , ~ ( m X a i s dt t37 at s 1 p ~ t p 2 ( e p ˚ ) ~ t 1 n / GP:H21cells). EGFP::DHC2.1 4/7 and C , 1 ) ~{ ( ) s ~ { x m p ~ 2 t ) , ~ 5 lag 2 ffiffiffiffiffiffi a ::: a j ~ P N p 1 1 n i 2log 3 2ad4frEF:IT2(27 EGFP::IFT52 for 4 and 12 13, L , z , X s 1 i m ˚ ~ 5 f )o F rtisa h lglu itltip, distal flagellum the at proteins IFT of C) m p "# i p Þð ðÞ L #{S} 1 1 , X exp 23 i a s ~  ~ a p ( v ( p p i t L ( 1 v r , N mxuemodel: -mixture 1 { a F eoiista eemeasured were that velocities IFT ) m m a a p 1 p ( eoe h adnlo nensemble an of cardinal the denotes i ) ftefaelmadtema lag mean the and flagellum the of m *, ( 1 { z t a z m X k , 2 ffiffiffiffiffiffi a a ) m ~ (t) m i p ( { i , p i v k x 1 s *, 1 s , r p j ::: i m a { steslto ftedynamical the of solution the is i s ) log p* exp 1 ( , i t t *) a ( m ) k n that and , p a i 1..p ( ), { conigfrrtord or retrograde for accounting L ) i ( n 2 m { h egto ahlwand law each of weight the 1 ) ftemdlt data to model the of  a fitting when , 2 2 ~ ( ~ e(x) x s j i { 3 m 1 p , f. X k m { fITsed with speeds IFT of a ~ m 0.89*3 i (t ) 1 1 2 2 k m  eoe the denotes ) 2 2 t p ( ) s h optimal the , k fluorescent 5 i ) p .7IFT 2.67 -mixture e(x) ˚ C), ˚ C, 1 S Þ ) he niiuluisbfr eunn notefaelm ecniee htthe contain that that considered trains we novel flagellum, into the pool cluster into base base returning flagellum flagellum before the trains units IFT to individual retrograde three back Because IFT model. of anterograde coming previous condition to are our clustering to a trains that include base retrograde further flagellum to the IFT decided at we of proteins cycle, conversion next base the necessary for flagellum the trains the for at units account IFT To of clustering the Integrating yorp rdcin n id ol hrPegOi Lotte for manuscript. Trepout Ooi, the Sylvain of Cher-Pheng and reading Rotureau Kohl, critical Brice Rosenbaum, Linda Joel initial thank and Pedersen, with also advice production, for We (UCSF) imaging. kymograph and providing Rafelski Susanne advice in and technical for assistance Engel for expert Benjamin Dynamique Roux for Pascal Machu d’Imagerie and Christophe equipment Plateforme their to the access thank We Acknowledgements a rirrl e at set arbitrarily was otiuet F,tefursec eoeyi hneult N/N to equal then is recovery fluorescence the IFT, to contribute N where ore hc lasts which journey time at flagellum epcieyeggdi igeITuis n n2 n 3-clusters. and 2- in and units, IFT single in engaged respectively ntcnbn oaohrsnl ntwt rate fluorescent with single unit a single Consequently, another equal. to are bind 2-cluster can a and unit unit single a between lglu ae hn ftetosnl F nt htbn ofr -lse are 2-cluster a form to bind that units IFT probability single a with two fluorescent, the both if Then, base. flagellum iie notresubpopulations: three into divided odtosi rvosdnmcleutos eoti h relations the obtain we equations, dynamical previous in conditions nt htaeeggdit nemdaecutr ftouisand units two of clusters intermediate into engaged are that units eetrtefaelma neord F ris h loecnerecovery fluorescence to to: The able equal trains. then thus are IFT is units anterograde 3-cluster photobleaching as These after units. flagellum three the of clusters re-enter final in engaged units where h lglu aeaddnmceuto 1 eue to: reduces (1) to equation back coming dynamic are and occurred, base base flagellum flagellum the the of photobleaching when flagellum reads igeITuista r oigbc rmteflagellum, the from back coming are that units IFT single ihrate with and igeITui sfurset ihpoaiiy2 one probability only if with While fluorescent, pool. 2-cluster is the unit into transferred IFT are single that units two by depleted oli nydpee yoeui.Bcueafursetsnl ntcnas ida bind also can equation unit dynamical single the fluorescent obtain a Because finally unit. we one 2-cluster, by depleted only is pool eoepoolahn,alteITprilso h lglu aeare base flagellum the of particles IFT the fluorescent: all photobleaching, Before N that consider we if Finally, hc eue to reduces which T 2 oevr easmdta h idn rate binding the that assumed we Moreover, 5 ffaelmbs F rtis htaeal opntaetefaelmand flagellum the penetrate to able are that proteins, IFT base flagellum of N N d 1 a 3 dt f ~ a 1 5 a 1 ( t ( 3 2N q ) k.N t ( ), ~ t f ffiffiffiffiffiffiffiffi { 1 = a yaiso nrfaelrtasot337 transport intraflagellar of Dynamics 1 a . 3 N i .N t 2 d ( 1 k ( ) t 1 a h oe sntvr estv otebnigconstant binding the to sensitive very not is model The . ) t 2 dt and ) 5  1 steefcienme ffursetpoen htetr the enters that proteins fluorescent of number effective the is 2 where /2, d d t ( 2 f t for 1 a a ) dt dt a 3 2 t ~ N k 3 t ( ( n oebc ttefaelmbs fe hi flagellum their after base flagellum the at back come and , ( t t nasm a,dnmcleuto for equation dynamical way, same a In . ~ ) ) t fITpoen htecag ihtefaelmcnbe can flagellum the with exchange that proteins IFT of a N { a ~ ~ 1 3 ( i 3 1 25 ( 5 t t N N t )  N N r h rprino loecn rtista are that proteins fluorescent of proportion the are ) ) ~ 1 1 N ,2ad3 and 3, and 2 1, f { 2 ersnsol etitdfato ftettlnumber total the of fraction restricted a only represents f 3 2 hc seuvln otesocimtycondition stoichiometry the to equivalent is which , 2 a ÀÁ  a 2i h fetv ubro -lsesisd the inside 2-clusters of number effective the is /2 d kN 3 2 1 a dt k ( a ( t ( t N { 1 t 1 2 ) ) ( N a N 1 t 2 ~ t N 1 2 ) N 1 2 kN ) ( z 2 { 5 t N a ) 1 ( h olo loecn igeITuisis units IFT single fluorescent of pool the , 1 1 N a 2 2 kN ( f { 2 a 1 t ðÞ ( ) +N 2 N 1 t { kN ( 1 2 ) { t N d N ) k.N kN 2 z a 2 1 dt +N a 2 z i N ( ( a a 1 1 2 t t ) ) .N 1 2 a 1 a ÀÁ k 3 ( ( ~ 2 a 1 where , 3 t t 1 ( ( a 2 )) ewe igeITuisor units IFT single between ) ri a idt 2-cluster a to bind can it or , t t { ( .R-netn hs initial these Re-injecting 0. 1 2 )( ) { t ( N ) 1 t 2 ) 3 f { z kN and a 3 a 2 N 1 ( 2 N 1 a t a 2 ( ) 1 1 t 1 )) ( h ubro IFT of number the ( t stenme of number the is t T )( h igeunits single the , N ) 1 a 3 a { (t). h ubrof number the 2 ( a t )and 1 ( N t ) 2 ~ k a 2 that a 3 N ( ( 1 t t ) ) , Journal of Cell Science olt .A,Tf,R . oat,K .adPzu,G J. G. Pazour, and E. K. Fogarty, A., R. Tuft, A., J. Follit, nslr .adBsat M. Boshart, and M. Engstler, ’aoIed-rne ..i uddb atu Transversal Pasteur a by funded (PTR387). is from Program fellowship T.L. Research doctoral a Ile-de-France. by C’Nano funded was N.C. Pasteur-Weizmann. ne,B . uigo,W .adMrhl,W F. W. Marshall, and B. W. Ludington, D., B. Engel, ehrh E37,teFnainpu aRceceMe Recherche la pour Fondation the (ED387), Recherche ete,W. Dentler, eaa,B,Bih,A,Lwo,N .adDxe,S. Doxsey, and D. N. Lawson, and A., R. Bright, C. B., K. Delaval, J. Matthews, and Fuster, K. Kirk, L., R., P. Marchetti, S., Beech, Dean, L., A. Himelblau, R., D. Diener, G., D. C. J. Cole, Olivo-Marin, and P. Bastin, I., Bloch, J., Buisson, N., Chenouard, C. J. Olivo-Marin, and I. Bloch, N., Chenouard, V. J. Shah, and B. Roy, Y., T. Besschetnova, Dore G., Toutirais, L., Kohl, T., Blisnick, S., Absalon, References at http://jcs.biologists.org/lookup/suppl/doi:10.1242/jcs.117069/-/DC1 online available material Supplementary by funded Ministe was the (ANR-08- from recherche J.B. fellowships la de (CNRS), ANR-09-GENOPAT-R09088KS). Nationale Scientifique Agence the MIE-027; Recherche of grants la Institut two de the by by and National funded Centre is Unit the Biology Pasteur, Cell Trypanosome the in Work manuscript. Funding the J.-C.O.-M. wrote and line. BIC study T.L. conceived cell the the P.B. supervised analyses. and GFP::DHC2.1 quantification. and mathematical the recycling the supervised their and IFT generated conceived of and T.B. model events analysis. mathematical the anterograde transport of analyses. produced separation quantitative retrograde the their allowing out and software carried the and developed reported, movies N.C. experiments the biological all the all acquired performed and designed J.B. contributions Author 338 eso,J n rgt M. P. Wright, and Bastin, J. Beisson, and E. Delannoy, G., Toutirais, T., Blisnick, C., Adhiambo, ukr,G,Faoo .M n oii I. Roditi, and M. J. C. Gaertig, Fragoso, and G., R. Burkard, Kosoy, C., Marsala, M., J. Brown, rnpr rti F2 sascae ihteGlicmlxadi eurdfrcilia for required is and complex Golgi the with associated assembly. is IFT20 protein transport rfikn ovysniiaint nueso tg ifrnito nTrypanosoma in differentiation stage of inducers brucei. to sensitization convey trafficking atcesz clsivreywt lgla egh eiiigteblnepitlength balance-point the revisiting length: flagellar model. with control inversely scales size particle hayooa flagella. Chlamydomonas srqie o pnl retto nmitosis. in orientation spindle for required in is assembly signal. differentiation ciliary trypanosome for the conveys required family proteins contain particles elegans IFT Caenorhabditis (IFT): L. transport J. Rosenbaum, 2010. China, Kong, Hong Flurescence 2010, in Particles Bi-directional Images Tracking Microscopy for Kymograph of Analysis Curvelet 2009. USA, Boston, 2009, Images Microscopy in rnfraino losra om fTyaooabrucei. 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