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GenomeProject-write:AGrandChallenge UsingSynthesis,GeneEditingandOtherTechnologies toUnderstand,EngineerandTestLivingSystems October31,2016 Author: Jef D Boeke, George Church, Andrew Hessel, Nancy J Kelley (GP-write LeadershipGroup)andTheGP-WriteConsortium† †Theauthorsandtheiraffiliationsmaybefoundatwww.gpwrite.org INTRODUCTION • The Human Genome Project (HGP-read) was initiated in December 1984 at the DOE Alta meeting and launched on October 1, 1990. Aimed at a nearly complete “reading” of the human and other genomes with annotations of plausiblegenefunctions,aswellastheimprovementofthetechnology,cost, and quality of DNA sequencing (1,2), it was the largest life science project everconductedandoneofthegreatfeatsofexplorationinhistory. • The first draft of the human genome was announced in June 2000, and a morecompleteversioninApril2003. • Since this announcement, interpretation of that data was made possible by sequencinghumansfromotherpopulationsaroundtheworld(HapMapand 1KG) and by other “omics” tools yielding insights into the functionality at basepairprecision(ENCODE),correlationsbetweennaturalgenomevariants andvarioustraitsanddiseasesviagenome-wideassociationstudies(GWAS), andidentificationofgenesandvariantsresponsibleforrareMendeliantraits by a combination of genomic sequencing and advanced computational methods. • Incredibly powerful and inexpensive DNA sequencing and genetic analysis technologies, developed, in part, by the National Human Genome Research Institute’s (NGHRI) Advanced DNA Sequencing Technology Development program, reduced the cost of sequencing a human genome more than a millionfoldfrom$3billiontolessthan$1,000injustoveradecade. • Sincethen,theworldhasembarkedonarevolutioninscienceandhealthcare that is changing the way we live and carries the promise of individualizing clinicaldeliverytoimprovehealth,andpreventandcurehumandisease.The Precision Medicine Initiative (for example), announced by the White House in 2015, would use the insights gained from “reading” each individual’s genome to personalize medical care based on an individual’s genes, 1 environment and lifestyle in order to keep that individual healthier longer andtargetpropertreatmentsfordiseasewhenitdoesoccur. • Francis Collins, the leader of HGP-read, described the working draft of the human genome as “the first glimpse of our own instruction book.” Today, many scientists believe that the way to truly understand that instruction book requires us to “write” DNA and build large Giga-base (Gb) animal and plant genomes, including the human genome, using the four basic building blocks of DNA, the nucleotide bases that encode biological functions. If successful,suchaneffortwouldresultinanddemonstrateanunderstanding of the fundamental biological processes of the natural world that could be usedtosolveimportantglobalchallenges. • Although sequencing, analyzing, and editing DNA continues to advance at breakneckspeed,ourcapabilityto“write”DNAsequencesincellsismostly limited to a small number of short segments, restricting our ability to manipulateandunderstandbiologicalsystems. GP-write:AGrandChallenge • TheGenomeProject-write(GP-write)willusesynthesisandgenomeeditng technologiestounderstand,engineerandtestlivingsystems.Itwillbuildon the knowledge and technological advances of HGP-read, and could be an equallytransformativenextstep. • Focused on writing and building variations on large Giga-base (Gb) animal andplantgenomes,includingthehumangenome,theprojectwouldgenerate awealthofinformationconnectingthesequenceofnucleotidesinDNAwith theirphysiologicalpropertiesandfunctionalbehaviors,andwoulddrivethe development of tools and methods that facilitate large scale synthesis and editing of genomes. Furthermore, because DNA synthesis, like sequencing and computation, is a foundational technology, GP-write could accelerate research and development (R&D) across a broad spectrum of life sciences, supportingbasicR&Dofnewbio-basedtherapies,vaccines,materials,energy sources,diseasevectorcontrol,andnutrition. • Another proposed benefit could be the commercial development of new genomics analysis, design, synthesis, assembly and phenotyping technologies. Overall the project would develop enabling tools of broad applicabilitythroughoutbiomedicalresearch,suchas: 2 1) Computational tools, which allow the redesign of any genome, followed by compilation and testing of the redesigned code in silicobeforehittingtheprintbutton, 2) Phenotypic screening platforms such as low-cost organoid cultures,whichallowcharacterizationofperformanceofsynthetic DNAandvariantsofunknownsignificance, 3) Cheaper, more accurate and longer DNA synthesis and assembly forpathwaysandwholegenomes(3) 4) Improvedgenomeeditingtechniquesandrecombinationmethods, and 5)Targeteddeliverytospecificcelltypesorsystemicallythroughout multipleorgansystems. DEFINITIONOFGP-writeANDHGP-write • GP-write will be an international scientific research project, led by a multidisciplinary group of US-based, global scientific leaders who are highly credibleingenetics,genomicsandengineeringbiology. • TheHumanGenomeProject-write(HGP-write)willbeacriticalcoreactivity withinGP-writefocusedonsynthesizinghumangenomesinwholeorinpart. Becauseofthespecialchallengessurroundinghumangenomes,thisactivity willincludeanexpandedELSIcomponent.Itwillalsobeexplicitlylimitedto workincells,andorganoidsderivedfromthemonly. • TheprimarygoalofGP-writeistoreducethecostsofengineeringandtesting large (0.1 to 100 billion bp) genomes in cell lines by more than 1,000-fold within10years. • Anadditionalgoalistosynthesizevariationsoncompletehuman(andother) genomesinorderto: (1) understandthefunctionalpropertiesandphenotypicconsequencesof thegenomesequencesprovidedbyHGP-read, (2) transform the quality of DNA tools, assembly methods, automated infrastructure,artificialintelligence,standardsanddatamanagement systems, 3 (3) (4) (5) • massively reduce the cost of writing and editing new genomes and creatingDNAatscale, disseminate broadly information and knowledge generated by GPwritethroughpubliclyavailabledatabasesontheInternettopromote rapidapplicationofresearchresults, drive development and commercialization of new related technologies,and (6) addresstheethical,legalandsocialissuesthatarisefromtheproject. Related goals would be training the next generation of scientific leaders, publiceducationandengagement,technologydevelopmentandtransfer. TheBasicPrimer • To understand how this would be accomplished, consider that the genetic instructions in DNA are found in the nucleotides: adenine (abbreviated A), cytosine (C), guanine (G) and thymine (T), whose sequence holds the biological information for functions within an organism. In humans, this sequenceconsistsoftwonear-identicalsetsof3billionnucleotidepairs. • Just as software programmers use infinite permutations of zeroes and ones to design and write software code that drive all functions of technology, so scientistscanwritecomputerprogramsusingthesenucleotidestodesign,rewritethegeneticcodeforandbuildentirelynewbiologicalsystemsfromthe groundup. • The actual DNA is produced using DNA synthesis, a technology improved duringthepastfewdecades,whichmakesitpossibletoassembleasynthetic DNA molecule de novo with no limits on sequence or size. Using these techniques of engineering biology, scientists are redesigning genes to improve gene expression, produce new regulatory structures, metabolic pathwaysandevenchromosomes(4). ActivitytoDate • Small viral and bacterial genomes synthesized from scratch and organisms with recoded genomes derived from large-scale genome editing have demonstratedthefeasibilityandutilityofsyntheticgenomes. 4 • The first whole genomes to be created using the techniques of engineering biology were those of viruses, beginning with the poliovirus in 2002 (5). Since 2003, only a few other virus and transposon genomes have been synthesized in their entirety. In 2010, a bacterial genome (1.05 Mbp, Mycoplasma) was synthesized as a nearly identical copy of the natural genome (6). The most radical departure from a natural bacterial genome wasthe2013alterationofthegeneticcodethroughoutthe~4.7MbpE.coli genome (7,8). This broadly enabled virus resistance (9) and in 2015 was extended to biocontainment strains, also known as rE.coli 2.0, fully dependentona21staminoacid(10,11). • Thelargestgenomesynthesisprojectcurrentlyunderwayisaninternational efforttowritethe12MbgenomeofSaccharomycescerevisiae(baker’syeast) ledbyDr.JefBoeke(NYU)(SyntheticYeastProject)(12,13).DubbedSc2.0, theprojecthasparticipationfromgroupsintheUS,theUK,Australia,France, Germany,SingaporeandChina.Theconsortiumhassuccessfullyassembleda synthetic chromosome (chromosome 3) and shown it to be functionally equivalent to the natural chromosome, but it has new features that native chromosomes lack, such as genome scrambling, a genome evolution and analysis method that generates many variants of a base genome. Extensive progressisbeingmadetocompletetheremainingchromosomes. WhatComesNext? • Withcompletionofthesyntheticyeastgenomecomingintosight,possiblyas early as 2017, the choice of what multicellular genome to synthesize and design next has been discussed. Just as HGP-read started with sequencing simple genomes through progressively more complicated ones, several candidateshavebeenadvanced,includingDrosophilamelanogaster(fruitfly) andCaenorhabditiselegans(nematodeworm).Neitheraloneislikelytodrive the transformations needed to make true progress in understanding the geneticblueprintdefinedinHGP-read. • Among genomes worthy of synthesis, the human genome would be truly transformative, with maximal implications for advancing the biomedical field, deciphering functional consequences of human genome variation and offering related benefits. By focusing on building the 3Gb of human DNA, HGP-write would push current conceptual and technical limits by orders of magnitude and deliver significant scientific advances. Recent technological advances in whole genome synthesis (14) and genome editing (15, 16) technologyarecurrentlyrevolutionizingthefieldofgenomeengineering(4). The newfound availability of haploid stem cells (17) could similarly revolutionize human genome writing by significantly reducing the complexity of the genome. The other mammalian genome that is the most 5 obvious choice for synthesis is that of the mouse, the best understood experimentalmammal. • Inordertocompletelarge-scaledesignandsynthesisofnewgenomes,many scientificandtechnicalissuesmustbeovercome.Whilenotinsurmountable, biologicalsystems,comparedtocomputers,havelesspredictableprocesses, evolve over time and are intrinsically very complex. A “Grand Challenge” project will help deepen our understanding and improve our design capabilities. • In addition, continued breakthroughs in basic science and the development ofinnumerabletools,assemblymethods,andstandardswillbeneededasthe project progresses. DNA synthesis and recombination methods, while improving in quality and cost effectiveness, are still too limited, slow and costlyandproduceDNAfragmentsthataretoosmalltoallowthecreationof thelargescaleprojectsnecessarytocreatethebreakthroughsinapplications desired. • A new “Grand Challenge” like GP-write, will galvanize the scientific community, engage a wide network of educational institutions, attract the required resources to successfully conclude the project, and accelerate research and development in order to make the advances engineering biologyrequirestosolvemanyoftheglobalproblemsweface. OperationofGP-writeandHGP-write • GP-write and HGP-write would proceed in phases according to a roadmap (Appendix1)toevaluatefeasibilityandvalue,justasHGP-read,ENCODEand the Synthetic Yeast Project also began with pilot projects (Appendix 2) focusingonafractionofthegenome:typically~1%butnotlimitedtothis amount. Intense technology development would also occur during this 3-5 year period to facilitate the other 99%. During this 3-5 year period, there wouldbeampletimetodebatewhetheraspecificfullHGP-writeproject(i.e. wholegenome)designwasscientifically,economicallyandethicallyjustified, orwhetherwholegenomeactivitieswouldbebetterslantedtowardamodel systemsuchasthemouse. • Inearlierprojects,thepilotswerearbitrarywithrespecttoprioritizationof functional value or practical applications. But for HGP-write, the pilot projects would be chosen to provide early stage resources valuable for biomedical research and/or biotech production, and/or safer stem cell therapeutic platforms. For example, using induced pluripotent stem cells (iPSCs)(18)tocreateamorestablebiomanufacturinghumancellresistantto any virus could help reduce costly incidents of virus contamination of vaccines seen in the past, including SV40 contamination of the Sabin oral 6 polio vaccine, and Vesivirus in the Genzyme orphan drug production fermenters in both the EU and USA (19). This particular project could also allow the powerful scrambling system developed for the synthetic yeast genometobeincorporatedatthesametime.Otherdesirablefeaturescould be added to this genome; a specific proposal for an “ultrasafe” human cell engineering platform, together with other suggested proposals for possible pilotprojects,areappendedtothisdocument. • Redesigninggenesinsuchahumancelllineoffersawaytounderstandhow the HGP-write genome might be made more resilient without impact on function,whileprovidingnewvaluablefeaturessuchasresistancetoviruses, cancerandotherdiseases,andagingprocesses. • OtherpilotprojectsrelatedtoHGP-writecouldinclude: 1) altering of endogenous viral genomes and other repetitive elements and testing for impact on organ development and functioninvitro, 2) makingcancerresistanthumanorgansinvitro, 3) makingsenescenceresistantorgansinvitro, 4) a synthetic version of ENCODE to answer questions of whether particular cis-regulatory elements or gene products are “just noise” or have functions evident upon removing one or more motifs,familymembersorputativeparallelpathwaymembers, 5) an ancestral human protein coding genome, bearing the homozygous ancestral allele (and/or the major allele) at each position, 6) specific chromosomes such as mitochondrial DNA or the Y chromosome, and human artificial chromosomes for special purposes. 7) Providing genes encoding pathways on designer chromosomes, suchasallgenesrequiredtomakeaprototrophichumancell,orto transform the pig genome to make it far more amenable for humanorgantransplantation. • • Thesesub-scaleHGP-writeprojectswouldalsoneedtoaddressthesocial, ethical,publicperceptionetc.issueslikelytoariseasareactiontothis proposal(20,21). The use of human organoids derived from iPSCs would help reduce animal testingandinmanycasesincreaseaccuracyofassessmentoffunctionand/or therapytesting.Theprojectwouldhelpresearchersdevelopskillsintesting and developing innovative technologies. Moreover, it would serve as an excellent readout for whether partially synthetic genomes retained all 7 • • • naturalfunctions,suchas“epigenomicmarks”whichareheritablechangesto DNA that do not involve a change in DNA sequence such as cytosine methylationandmodificationsofthestructureofnucleosomesinwhichDNA is packaged. The epigenomic tools to systematically and faithfully program organoidscouldbeastransformativeasthegenomictools. The goals of GP-write and HGP-write are necessarily ambitious, since buildingahumangenomeattoday’spriceswouldcostmorethanHGP-read. The costs of the project lie not only in the raw DNA, but in the design infrastructure, assembly, integration, functional assays and biological interpretationrequiredtounderstandtheresultingphenomes.However,an expectation of GP-write will be to catalyze a sharp price drop as new technology development occurs apace with advancement of the project as withthecostofDNAsequencinginHGP-read.Indeed,recentandcontinued improvements in enabling technologies are not only improving the cost, quality and time period necessary to complete the project, but also, most otherfieldsofbiomedicine;thusthereturnoninvestmentwillbeswiftand substantial. The estimated cost of GP-write and HGP-write will be worked out over the next few months, but the goal would be to launch the project with $100 millionincommittedsupport. Roughly $40 million has been spent on microbial and mammalian genome engineering pilot projects represented by co-authors on this paper to date andAutodesk,hasofferedaleadershipgiftof$250,000toseedtheplanning and launch of GP-write and HGP-write. The project will require four matchinggiftstocovertheplanningandlauncheffort. ResponsibleInnovation • Genomesynthesisisanaturalextensionofthegeneticengineeringtoolsthat havebeenusedsafelywithinthebiotechnologyindustryforthepast40years and have provided significant benefits to society. However, recent technologicaladvancements,suchaschip-synthesis,standardizedlibrariesof genomicpartsandgenomeeditingtechnologiesarerevolutionizingthefield andcreatinguncertaintyinhowthesetechnologieswillbeapplied. • As human genome-scale synthesis appears increasingly feasible, a coordinatedscientificefforttounderstand,discuss,andapplylargegenome editing technologies is timely; and public discourse is both expected and encouraged.HGP-writewillrequirepublicinvolvementandconsiderationof ethical, legal, and social implications (ELSI) from the start. However, responsibleinnovationrequiresmorethanELSI;italsoinvolvesidentifying 8 common goals important to scientists and the wider public through timely anddetailedconsultationamongdiversestakeholders. • HGP-write will enable public discourse; having these conversations well in advance of project implementation will guide emerging capabilities in science and contribute to societal decision-making. Through open and ongoingdialog,commongoalscanbeidentified.Informedconsentmusttake local and regional values into account and enable true decision-making on particularlysensitiveuseofcellsandDNAfromcertainsources.Finally,the highest biosafety standards should guide project work and safety for lab workersandresearchparticipants. • To assure responsible innovation and ongoing consideration of ELSI, a percentageofallresearchfundscouldbededicatedtotheseissues,enabling inclusivedecision-making.Inaddition,thereshouldbeequitabledistribution of any early and future benefits in view of diverse and pressing needs in differentglobalregions.Thebroadscopeandnoveltyoftheprojectcallsfor consideration of appropriate regulation alongside development of the scienceandsocietaldebates.Nationalandinternationallawsandregulations differand,asinstemcellresearch,amajorburdenofresponsibilityofsetting standardsrestswiththescientistsandtheircommunity. Organization/AdministrationofGP-writeandHGP-write • • Dr.JefBoekefromNewYorkUniversitySchoolofMedicine,ageneticistand the lead designer/investigator of the Sc2.0 project, and Dr. George Church, from Harvard Medical School, geneticist/technologist behind the rE.coli projectvolunteeredtoassembleakeygroupofscientists,ethicistsandpolicy makers steeped in human biology, health and synthetic biology. This group met on Saturday, October 31, 2015, to conceptualize and discuss the feasibility of HGP-write. The participants in this organizing meeting were invitedtoco-authorthisWhitePaper,tobesenttointerestedfunders. On May 10, 2016, more than 130 international scientists, industry leaders, ethicists and policy makers steeped in human biology, health and synthetic biologycametogetherinBostonforanexpandedorganizingmeetingofHGPwrite. This meeting focused on the design and technical issues, ethical and socialissues,andindustryinvolvementofHGP-write.Basedondiscussions atthismeeting,theGP-writeLeadershipGroupdecidedtobroadenthescope of the project to include all large animal and plant genomes, including the humangenome,andtomakeHGP-writeonecomponentofGP-write. 9 • The October and May meetings are part of a series of scientific discussions amongst the community that have been unfolding over the past several years.Initially,thesemeetingswerefocusedonthesynthesisandtestingof yeast and bacterial genomes, and the future of synthetic biology. More recently,thefocushasshiftedtosynthesisofvariationswithinlargegenomes as a pathway to addressing some of the many global challenges facing humanity,includinghealthcareandtheenvironment. • ThelaunchofGP-writeisscheduledfor2016,asignificantmilestonesinceit falls during the 25th anniversary year of the original HGP-read, and marks another big leap forward. This is a chance to inspire a new generation of scientistsandengagethepublicinsustaineddiscourse. • GP-write will be implemented through a new, independent nonprofit organization, the Center of Excellence for Engineering Biology. The Center, which will operate virtually at first, will manage initial planning and coordination efforts. These efforts include supporting the formation and workofmulti-institutionalandinterdisciplinaryresearchteamsworkingina highly integrated fashion, responsive to and engaged with a broach public outreach.AdditionalCenterscouldbeincludedinthefuture. • The Center will create a neutral environment for international participants andwillacceptfundingfromthepublic,private,philanthropicandacademic sectors, including international funding agencies. However, this in no way precludesdirectgrantsandsponsoredresearchagreementsbygovernment agencies and others to academic and industrial laboratories through more traditionalmechanisms. • A Scientific Executive Committee of the Center, supported by scientific working groups, will set the scientific priorities for GP-write and supervise peer-reviewed research projects. The Center will enter into affiliation agreements with the major universities and philanthropies participating in GP-write.Actingasacoordinatingcenter,itwillsupportandcoordinatethe work of multi-institutional and interdisplinary research teams working in a highly integrated fashion responsive to and engaged with a broad public outreach.ThisissimilartothewayHGP-readwasadministeredwithinthe federalgovernment. • Key governance and operational issues for the Center will be worked out duringtheinitialorganizingandplanningprocessforGP-write.Thisprocess will be led by Nancy J Kelley, JD/MPP, previously the Founding Executive Director of the New York Genome Center, who has been leading a strategic planningprocesswiththesyntheticbiologycommunitysince2014.Wilmer Halewillassistintheseefforts. 10 • The IT infrastructure for GP-write will be designed to foster large-scale collaborative science across international boundaries, institutions and scientific disciplines. Using the power of open networks to solve complex scientific problems, an open sourced, fully automated design, test, build platform would support the sharing of knowledge and expertise and largescale pooling of data. Essentially, this platform would create a community hubdesignedtoenhancecommunicationandgrowcommunitiesofscientists with diverse skill sets that can work together on the complex and diverse scientificproblemsthatwouldneedtobetackledinGP-write. • Leading experts in this area can offer important insights in order to design andbuildthisinfrastructureaswellasprovidetoolsandtheenvironmentto conduct dynamic, large-scale collaborative biomedical research. These include, among others, Global Alliance for Genomics and Health, UCSC Genome Browser, Sanger Institute, Broad Institute, Beijing Genomics Institute, OpenHumans.org, Sage Bionetworks, Google Genomics, the Wyss InstituteforBiologicallyInspiredEngineeringandCloudera. IntellectualpropertydevelopedinGP-writewillencouragebroadaccessand use through the use of patent pooling and common Licensing Agreements. Theopensourcefree-sharingofengineeredcellspoliciesoftheSc2.0project willalsobeconsideredforatleastsomecomponentsoftheproject. • • Leading experts will also be called on to consider the ethical, policy and publiceducationcomponentsofGP-writeincollaborationwiththeCenterof Excellence in Engineering Biology (15). For example, the Woodrow Wilson Center for International Scholars has been leading the Synthetic Biology Project following these issues for several years, supported by the Sloan Foundation. • We encourage public discourse to occur surrounding HGP-write, and that havingtheseconversationswellinadvanceofdeliverableswillhelpsociety better prepare for and guide emerging capabilities. Through a transparent two-way dialog, common goals can be identified and concerns, based on culturalvalues,caninformthedirectionandoutputoftheproject.Finally,the highest biosafety standards should guide project work, and safety for lab workers, research participants, and ecosystems should pervade the design process. • A dedicated percentage of all research dollars received from each grant for HGP-write may be specifically targeted toward these issues. The project infrastructure will include active involvement of humanities scholars, including but not limited to bioethicists and legal scholars, established 11 mechanisms for community discussion, and will enable inclusive decisionmaking. FundingforGP-writewillcomefrompublic,private,philanthropic,industry andacademicsourcesaroundtheworld.Fundraisingeffortshavebegun. 12 • Appendix1--DraftRoadmapforGP/HGP-write Years1-5:Massivetechnologydevelopmenteffortonwriting,deliveringand testingaspectsonE.coli,yeast,andhumancells. Year1:SelectatleastoneHumanGenomePilotProjecte.g.ultrasafe,tomove forwardasaninternationalconsortium Years2-5:HumanandotherwholegenomesynthesisPilotProjectsselected withawelldefinedtherapeuticallyordiagnosticallyvaluable“product" (earlyreturnoninvestment). Years1-4:Majorefforttoengagewithrepresentativemembersofthepublic aswellaswiththescientificcommunity,humanities,focusgroupsetc.,to identifycommonoutcomesofvariouspossiblewholegenomesynthesis projects,toidentifypotentialbenefitsthatresonatebestwiththepublic. Years1-5:SafetyandSurveillanceTechnologyDevelopment. Years5-10:OngoingTechnologyDevelopment;additionalpilots,ascosts dropandresourcesincrease,tacklescalesfromepigenomictoecosystem. Years5-10:Shiftintohighgearonwholegenomeprojects.Humancells and/ororganismal(mouse),plantandothers,dependingoninputfromthe public,thefundingagenciesandthescientificandindustrialcommunities Transitiontoenvironmental,farm,factory,clinicaltests 13 • • • • • • • • Appendix2--ThemesforPilotProjectsforHGP-write UltrasafeCellLine,JefBoeke,GeorgeChurch,FarrenIsaacs,MarcLajoie HGP-writeproposestoengineerahumancelllineforuseasabasicandpotentially universalplatformforhumanbiotechnology.Thiscanbedonebyalteringroughly 1% of the genome, including the exons of all of the genes, and nearby sequences, leaving the vast majority of the noncoding regions, which are at this point far less wellunderstood,untouched. It is anticipated that many of the details of this cell line remain to be extensively discussedandtheplansforexactlyhowtoconstructitwillbejointlyworkedoutby agroupofhumangeneticsandgenomicsexpertsaswellassyntheticgenomicists. There is an unmet need for an “ultrasafe human cell line” designed to serve as a platform for many biomedical applications, from production of biologics, to modeling cell and tissue behaviors, to actual ex vivo and ultimately in vivo therapeuticapplications.Asdescribedbelow,thiscelllinewillbeengineeredtobe ultrasafefrommanydistinctperspectives.Becausethiscelllinewouldpotentially beofgreatvaluetothepharmaceutical,vaccine,andbiotechnologyindustries,this theme as a pilot project should be very attractive to philanthropic and industry, potentiallyasapublic/privatepartnershipdesignedtobenefittheentirebiomedical community. Safetyandotherpropertiesofan“ultrasafe”cellline Property Virusresistant Prionresistant Retroelement/transposonfree Tripletrepeatresistant Germlinenegative Radiationresistant Multipleselfdestructcircuits Cancerresistant Immuno-negative Multiplesafelytargetablesites Majoralleleforeverycoding regionSNPandindel Scramble-able Explanation Celllineresistsvirusesthroughcodon/tRNArecoding Endogenouspriongenedeletedorrecoded AllmobileDNAsinactivated Tripletrepeatregionsmadesafebyrecoding Engineeredtopreventgermlinetransmission VeryactiveDNARepairsystems Orthogonalmechanismstocontrolcellgrowth P53andothertumorsuppressorsre-engineeredtominimize chanceofdeleteriousmutations Engineeredtominimizeimmunerejection Safeinsertionoffutureengineeredcircuitsandpathways “Average”humancellsmaximizescompatibilitywithdiverse humanpopulations Allowsrapidevolutionaryoptimizationfordesirabletraits 14 SynthesizingaPrototrophicHumanGenome,HarrisH.Wang Chronic malnutrition is a global health challenge leading to a variety of systemic diseases, mortality and negative life outcomes, afflicting especially children and adults in underdeveloped and developing countries. In contrast to bacterial cells, which can produce all metabolites needed for growth from simple sugars and elementalbuildingblocks,humansaremetabolicallyincapableofbiosynthesisof9 of20aminoacidsneededforlife.Instead,these9essentialaminoacidsarederived from diet. In addition to amino acids, at least 10 essential vitamins needed to be consumed as well since they cannot be produced by the body. While certain vitaminscanbeproducedbyhumans,theyareoftengeneratedatinsufficientlevels andrequiresignificantdietarysupplementation.Thesedeficienciesresultinchronic malnutrition and food shortage and can potentially be addressed using synthetic genomicapproaches. In general, the simpler amino acids are easily derived from core intermediates of metabolism.Incomparison,morecomplexaminoacids,requiringupto15steps,are essential.Duetounknownevolutionarypressures,humans(andrelatedmammals) have yet to evolve capabilities to synthesize these essential compounds. The biosynthesisofessentialaminoacidsandvitaminsaregenerallywell-characterized andthegenesandpathwaysresponsibleforthemareknown. We propose to heterologously introduce these biosynthetic pathways for amino acidsandvitamins(aswellastheregulatoryfactors)intothehumangenomeasto enable human cells to be less dependent on (or completely independent of) exogenoussupplementationofthesemetabolites.Itisanticipatedthattheproof-ofconceptstudieswillbedoneincelllinesincludingstemcells,whichcanbegrownin defined media. In the future, one could imagine extending other pathways such as photosynthesismachineryfromalgaeorplantstogenerateautotrophichumancells. Utility: In addition to the eventual goal of generating prototrophic human cells to combatmalnutrition,onecouldimaginethisstudytobeofutilityforunderstanding the biochemical milieu needed for mammalian organismic development, cell differentiation,andnutrition-associatedagingprocesses.Sincecurrentmammalian production cell lines (e.g. CHO cells) require expensive growth medium, one could imagineusingtheseprototrophiccellswithcheapergrowthmediumformulationsat larger bio-production scales, leading to more economical biosynthesis of various drugsandbiologicsthatrequiremammaliancelllines. Itislikelythatavarietyofpathwayconfigurationsneedtobeexploredtooptimize biosyntheticlevels,aneffortwell-suitedforaDNAsynthesisprojectofthissize.The chromosomal integration sites will need to be stable. Thus this effort will likely leveragetechnicalresources,advances,andactivitiesgeneratedbyotherHGP-write 15 projects (e.g. building additional chromosomes or discovering safe chromosomal insertion sites). In order to generate all essential amino acids, vitamins, and other metabolitepathways,weanticipatethat>200kbofDNAwillneedtobesynthesized, possiblymoretotestvariousexpression/pathwayconfigurations,whichisactually closerto0.1%ofthehumangenome. TheSevenSignalsToolbox:SyntheticallyReprogrammingCellstoEnableCell andTissueTherapies,LiamHolt TheHGP-writeultrasafecell-linewilllikelybegeneratedinaninducedpluripotent state. This approach will derive maximum value from the HGP-write project in termsofscientificunderstanding,commercialapplicationandtherapeuticpotential becausethepluripotentcellcanbedifferentiatedintoanyhumancell-typeortissue. Tofullycapitalizeonthisflexibilitywewilldevelopasyntheticapproachtocontrol thedifferentiationofHGP-writecells. Theastonishingdiversityofcellandorganstructuresinthehumanbodyarelargely generated from the action of just seven conserved developmental signals: the Hedgehog, Wnt, TGF-β, receptor tyrosine kinase, Notch, JAK/STAT and nuclear hormone pathways. These pathways are activated in many combinations and temporal patterns to drive the differentiation of stem cells into hundreds of cell types during embryogenesis. These pathways all have a tree-like structure, with many‘branches’acceptinginputinformationthatisfunneledtoacore‘trunk’that transducesthesignal,whichisthenrelayedintomany‘roots’leadingtohundredsof transcriptional and cell biological changes. Taking Wnt signaling as an example: There are 29 Wnt-family ligands that bind to 8 Frizzled receptors (the branches). These branches feed into a single GSK3-b core transducer (the trunk), which then drives activation of many transcription factors to activate or repress hundreds of genes (the roots). Most current efforts in cell reprogramming either modulate growth factors or various combinations of transcription factors. These approaches are searching through the vast combinatorial space in the branches and roots. In contrast, we will develop synthetic methods to perturb the seven major developmentalsignalingpathwaysattheirconservedcore:thetrunkofthetree.We will develop a genetic toolbox for the precise temporal modulation of the seven pathways at their ‘trunk’ in any combination using optogenetic and chemical controls. In addition, we build a complimentary toolbox of reporters for the rapid phenotypic profiling of these cells thereby enabling the mapping of signaling to phenotypeinhigh-throughput. This approach vastly reduces the search space necessary to find the appropriate reprogrammingsignalsthatwillgenerateawiderangeofdifferentiatedhumancelltypes. We recognize that the effect of activating a signaling pathway can be very 16 different in distinct cell types due to the presence or absence of co-activators, repressorsandothersignalingmodulators.However,webelievethatthiscontextis generatedbythehistoryofactivationofothermembersofthesevencorepathways. Therefore,webelievewecanrecapitulatemostcellularreprogrammingbydriving thesevenpathwaysattheircoreintheappropriatetemporalcombinations.Indeed, cell fate determination is hierarchical, supporting this idea and increasing the feasibility of this project by allowing the problem to be parsed into discreet steps. This project will both create a map for the artificial control of development and generatetoolsthatfacilitatethecontrolcellofdifferentiationinvitro.Ultimately,a precise control of cell differentiation is a crucial step toward cell therapies, tissue replacement or even organ transplants either with patient-derived iPS cells or ultrasafeHGP-writecells. ProbingChromosomeStructure,FunctionandBuildingBetterContainment JasperRine I have taken the 1% Pilot to mean projects involving the synthesis of genomes or genomefragmentsthatarelessthan30megabases,focusingattentiononmicrobes andportionsofsinglechromosomesinotherspecies.Inreducingthegrandvision to practical and achievable goals, two issues provide initial foci. 1.) Safety and containment: Can we build reliable tools that would prevent a synthetic genome from ever emerging following hybridization with a natural genome? 2) What can we learn about the contribution of DNA sequence to chromatin and chromosome structureatamoremacrowaythanpreviouslypossible? The synthetic yeast and E.coli genomes can play vital roles. There will likely be substantialpushbackonthegoalsoftheGP-write.Butdemonstrationofaclassof questions that can only be answered by use of synthetic genomes may help the communitytoseethegoalsandopportunitiesthattheGP-writecouldbring. SafetyandContainment.Ifsyntheticgenomesaretoplayaroleinagriculture,we willfaceadauntingscaleissuegiventhatmillionsofacresareundercultivationfor thefewmajorcropsthathavebeenengineered(corn,soybean,cotton,andcanolain theUS).Whiletheprobabilityofanadverseeventislow,theopportunitiescouldbe enormous.Thecommonoccurrenceofhybridsinnaturesuggeststhatanysynthetic organismcouldfindawaytohybridizewithanaturalorganismatsomefrequency. So, I think methods should be developed that would ensure that no recombinants from such a hybrid would survive. The classic Drosophila balancer chromosomes provideonesuchinspiration.Thesyntheticyeastgenomeprovidesopportunityto observehowmuchcontainmentcanbeachievedinawell-understoodcontext.The projectwouldconsistofusingthegenomescramblingcapabilitybeingputintoSc2.0 to first scramble one chromosome and then multiple chromosomes to learn the efficiencies by which scrambled balancers could prevent meiotic survivors, and analyze failure modes allowing recombinant gamete survival. Ancillary activities 17 could include development of toxin-antidote combinations, e.g. restrictionmodification gene pairs that were inserted into centromeres such that, if the pair wereeverseparated,thecellwoulddie. Chromatin and Chromosome Structure. We have been relatively blind to a middle range of chromatin structures larger than nucleosomes, and beyond the limits of light microscopy. The various Chromosome Conformation Capture technologies,especiallyHi-Caswellassuper-resolutionOligopaints(21)aremaking a contribution, but to date they have been largely data collecting exercises rather than experiments. The Sc2.0 and scrambled derivatives provide a logical opportunity to determine the functional consequences of sequences, shapes and contact maps of these chromosomes. Drosophila polytene chromosomes are nature’s own magnifier of chromatin structure and provided the classic proof that chromatin structure was determined by underlying DNA sequence. If we could introduce substantial synthetic sequences into Drosophila, we could use polytene chromosomes to uncover principles behind how particular sequence creates particularstructure. EngineeringHumanOrganoidsWithTheHumanVariomeAsASubstrate, AdamArkin,GeorgeChurch Numerous GWAS studies and population genetic studies have identified variations inthehumangenomethatarecorrelatedwithkeydisease,aging,andsusceptibility phenotypes. Further, and either less or more interesting there is an increasing numberofhominidgenomesthatpresentpossibleevolutionaryvariationthatmay beimportantinunderstandingcurrenthumanfunction.Thesevariationsarelikely important for different responses to medical treatments and environmental challenges that have been difficult to resolve with complex clinical studies or the small number of cell lines used for clinical and drug research. A number of key innovationshaveleadtotheabilitytomakestructuredtissueswithpropertiesvery similartoanindividual'sorgantissueforanumberoforgansystems.Astepbeyond this would be to take a set of exemplar tissues we can make in this way and introduce into them with genome editing technology as many of the known importantallelicandgenomestructuralvariationsidentifiedaboveaspossible(20). Combinations could be those known from individuals that identify human and hominid subpopulations, or introduced somewhat randomly. The resultant synthetic tissue bank then becomes an excellent substrate for drug and environmental response screening. Validation that these tissues respond differentiallyinwayssimilartodifferenthumansubpopulationscouldbreedagreat deal of interest from the pharmaceutical industry. The existence of differential response of these tissues to chemical, microbial/viral, or other environmental challengethenprovidesandexcellentstartingpointformechanisticallyunravelling 18 themolecularbasisforthesedifferencesandwaystocontroltheseinteractionsand outcomes. ThroughTheLookingGlass:AnticipatingAndUnderstandingGovernance SystemsAndThePublic’sViewsOnHGP-Write,ToddKuiken Understanding and anticipating the governance issues around HGP-write will be a critical component for the project’s success which may include local, state and nationaloversightregimesbothattheresearchstageandfortheeventualapproval of any product/applications. In addition, establishing a public dialogue and outreach program to not just inform, but incorporate the public’s views into the research program, will better enable HGP-write to acquire and sustain funding which will span multiple administrations over time and enable public support to continuesuchfunding. ReferencesandNotes: 1. 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