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    Synthetic yeast genome project (Sc2.0)

    Also known as Sc2.0, synthetic yeast project

    Sc2.0 is an international project to build the first synthetic eukaryotic genome, a redesigned Saccharomyces cerevisiae genome plus a new-to-nature tRNA neochromosome.[1] Its final synthetic chromosome, the 903-kilobase synXVI, was reported in Nature Communications on 20 January 2025, and debugging designed chromosomes produced reusable methods of its own.[2][3]

    Editor reviewedUpdated Synthetic biologyLife sciencesScience
    Key facts

    What it is

    Sc2.0 is a multi-laboratory effort to build the first synthetic eukaryotic genome: a redesigned version of the Saccharomyces cerevisiae genome, accompanied by a tRNA neochromosome that has no counterpart in nature.[1] Unlike a copy, the synthetic version is edited by design, with repeated elements removed and recombination sites added so that later experiments can scramble and rearrange the genome deliberately.[1]

    The final chromosome

    The chromosome set was completed with synXVI, a 903-kilobase synthetic chromosome reported in Nature Communications on 20 January 2025.[2] As with other chromosomes in the project, the published work covers both construction and iterative redesign rather than a single successful build.[2]

    Debugging as a deliverable

    The most transferable output of Sc2.0 may be its failure analysis. The teams used a CRISPR-based protocol, D-BUGS, to identify which specific design changes impaired growth and then correct them.[3] (For the editing chemistry itself, see how CRISPR works.) That reflects a general lesson of genome writing: a designed sequence is a hypothesis, and locating the broken part of a megabase-scale design is itself a research problem.[3] The same pattern appears in recoded bacteria, where building a four-megabase Escherichia coli genome with more than 101,000 codon changes required fixing regions where growth suffered.[4]

    Why it matters

    The project’s stated motivation is practical as well as fundamental: the team presents designed, debuggable chromosomes as a way to create more resilient organisms for food and medicine production.[5] Yeast is already an industrial workhorse, so improvements that make strains easier to redesign feed directly into fermentation-based manufacturing.[6]

    Dependencies

    Genome-scale projects consume synthetic DNA in bulk, which ties them to supplier economics: Twist Bioscience alone shipped about 369,000 genes in the quarter to June 2026.[7] Longer error-free constructs reduce the assembly burden, which is the pitch for enzymatic synthesis and its 50-kilobase clonal products.[8][9]

    What the project changed

    Sc2.0’s lasting contribution is less the artefact than the practice: design rules for a eukaryotic chromosome, a build process that tolerates error, and a debugging protocol that localises the design change responsible for a growth defect.[1][3] That package is reusable. Recoding work in bacteria follows the same build-and-fix pattern at megabase scale.[4][10]

    Genome writing in context

    Sc2.0 is one of several approaches to writing rather than editing genomes, and they make different bets. Sc2.0 redesigns a eukaryotic genome chromosome by chromosome and adds a new-to-nature tRNA neochromosome.[1] Recoding projects rewrite the genetic code itself: Syn57 is a four-megabase Escherichia coli genome with more than 101,000 codon changes that removes seven codons, four for serine, two for alanine and one stop codon, freeing them for non-canonical amino acids and virus resistance.[4][10][11] Minimisation strips a genome instead of rewriting it, leaving about 473 genes in JCVI-syn3.0.[12]

    A further approach appeared in 2026 that avoids large constructs altogether. Shotgun Genetic Engineering, published in Nature Biotechnology on 6 October 2026, delivers many barcoded small constructs into mammalian cells so that each cell carries a different synthetic pathway, and reads out the working combinations by sequencing barcodes from cells with the wanted phenotype.[13][14] Even there, the successful solutions needed 23 to 52 kilobases of synthetic DNA integrated per cell.[15] All of these styles rest on the same industrial base: commercial clonal constructs reach about 50 kilobases and conventional routes generally stop below about 10, which is why megabase projects stay fragment-and-recombine exercises with a debugging stage afterwards.[8][9][3]

    What to watch

    The outstanding scientific question is how a fully synthetic eukaryotic genome behaves when all synthetic chromosomes are combined and then deliberately rearranged, and whether the designed recombination system yields useful strains.[1][5] Published consolidation results are the thing to look for in the field’s minimal-genome and genome-writing literature over the next year.[16]

    Questions readers ask

    What is Sc2.0?

    An international project to build the world's first synthetic eukaryotic genome, a redesigned version of the baker's yeast genome plus a new-to-nature tRNA neochromosome.[1]

    Is the synthetic yeast genome finished?

    The final synthetic chromosome, the 903-kilobase synXVI, was reported in Nature Communications on 20 January 2025.[2]

    What happens when a designed chromosome does not work?

    It is debugged. The team used a CRISPR-based protocol called D-BUGS to locate and correct design changes that impaired yeast growth.[3]

    What is the point of rewriting a genome that already works?

    The team presents engineered chromosomes as a route to more resilient organisms for food and medicine production.[5]

    Sources

    Each numbered claim is a statement we checked against the sources listed with it. Status shows how well established it is.

    1. [1]

      Sc2.0 is an international project to build the first synthetic eukaryotic genome, a redesigned version of the Saccharomyces cerevisiae genome plus a new-to-nature tRNA neochromosome. confirmedas of 2025-01-22

    2. [2]

      The final synthetic chromosome of the Sc2.0 project, the 903-kilobase synXVI, was reported in Nature Communications on 20 January 2025. confirmedas of 2025-01-22

    3. [3]

      The Sc2.0 team used a CRISPR-based debugging protocol, D-BUGS, to locate and correct design errors in synthetic chromosomes that impaired yeast growth. confirmedas of 2025-01-22

    4. [4]

      Syn57 is an Escherichia coli strain whose 4-megabase genome was built by total synthesis with more than 101,000 codon changes, giving it a 57-codon genetic code; the work was published in Science in 2025. confirmedas of 2025-08-01

    5. [5]

      The Sc2.0 team presents engineered chromosomes as a route to more resilient organisms for food and medicine production. reportedas of 2025-01-22· interpretation

    6. [6]

      Onego Bio's Bioalbumen is ovalbumin with the same amino acid sequence as chicken egg white protein, made by precision fermentation in the filamentous fungus Trichoderma reesei. confirmedas of 2025-09-24

    7. [7]

      Twist Bioscience shipped about 369,000 synthetic genes in the third quarter of fiscal 2026, against about 237,000 in the same quarter of fiscal 2025. confirmedas of 2026-08-05

    8. [8]

      Ansa Biotechnologies announced commercial availability of clonal DNA constructs up to 50 kilobases made on its enzymatic DNA synthesis platform, roughly 100 times longer than its first product. reportedas of 2025-10-01

    9. [9]

      Ansa Biotechnologies says industry-standard DNA synthesis approaches generally cannot produce constructs longer than about 10 kilobases. reportedas of 2025-10-01

    10. [10]

      Syn57 removes seven codons from the genetic code: four that encode serine, two that encode alanine and one stop codon. confirmedas of 2025-08-01

    11. [11]

      The Syn57 team gives two intended uses for freed codons: incorporating non-canonical amino acids to make new polymers and macrocycles, and making production strains resistant to viral infection. confirmedas of 2025-08-01

    12. [12]

      JCVI-syn3.0, derived from Mycoplasma mycoides subspecies capri, carries about 473 genes and is described as the simplest bacterium capable of autonomous growth in axenic culture. confirmedas of 2025-06-02

    13. [13]

      Nature Biotechnology published "Highly multiplexed mammalian metabolic engineering with a shotgun approach" on 6 October 2026. confirmedas of 2026-10-06

    14. [14]

      Shotgun Genetic Engineering delivers many barcoded small DNA constructs into mammalian cells rather than one large construct, so each cell carries a different synthetic pathway and functional combinations are identified by sequencing barcodes from cells with the wanted phenotype. confirmedas of 2025-07-08

    15. [15]

      The shotgun engineering authors screened millions of pathway combinations in CHO and Jurkat cells, reaching near-wild-type growth in valine-free medium and isoleucine prototrophy in CHO cells, with successful solutions requiring 23 to 52 kilobases of synthetic DNA. confirmedas of 2025-07-08

    16. [16]

      More than 90 research groups have used or studied the JCVI minimal cell and related strains since the 2016 publication. confirmedas of 2025-06-02

    17. [17]

      Twist Bioscience's DNA Synthesis and Protein Solutions revenue reached $56.6 million in the third quarter of fiscal 2026, up from $40.8 million a year earlier. confirmedas of 2026-08-05

    Revision history (2)
    1. Page created.
    2. Refresh: added the comparison with recoded bacterial genomes and with 2026 high-throughput mammalian pathway engineering, and the synthesis-length constraint behind genome-scale projects.

    Created Oct 10, 2026. Last reviewed by an editor on Oct 10, 2026. Next scheduled review: Jan 10, 2027.

    Cite this page

    "Synthetic yeast genome project (Sc2.0)." ContentLora, updated Oct 10, 2026. https://contentlora.com/wiki/synthetic-yeast-genome-project

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