“Perfect” designer chromosome V and behavior of a ring derivative.
Open accessAbstract
INTRODUCTION The Saccharomyces cerevisiae 2.0 project (Sc2.0) aims to modify the yeast genome with a series of densely spaced designer changes. Both a synthetic yeast chromosome arm (synIXR) and the entirely synthetic chromosome (synIII) function with high fitness in yeast. For designer genome synthesis projects, precise engineering of the physical sequence to match the specified design is important for the systematic evaluation of underlying design principles. Yeast can maintain nuclear chromosomes as rings, occurring by chance at repeated sequences, although the cyclized format is unfavorable in meiosis given the possibility of dicentric chromosome formation from meiotic recombination. Here, we describe the de novo synthesis of synthetic yeast chromosome V (synV) in the “Build-A-Genome China” course, perfectly matching the designer sequence and bearing loxPsym sites, distinguishable watermarks, and all the other features of the synthetic genome. We generated a ring synV derivative with user-specified cyclization coordinates and characterized its performance in mitosis and meiosis. RATIONALE Systematic evaluation of underlying Sc2.0 design principles requires that the final assembled synthetic genome perfectly match the designed sequence. Given the size of yeast chromosomes, synthetic chromosome construction is performed iteratively, and new mutations and unpredictable events may occur during synthesis; even a very small number of unintentional nucleotide changes across the genome could have substantial effects on phenotype. Therefore, precisely matching the physical sequence to the designed sequence is crucial for verification of the design principles in genome synthesis. Ring chromosomes can extend those design principles to provide a model for genomic rearrangement, ring chromosome evolution, and human ring chromosome disorders. RESULTS We chemically synthesized, assembled, and incorporated designer chromosome synV (536,024 base pairs) of S. cerevisiae according to Sc2.0 principles, based on the complete nucleotide sequence of native yeast chromosome V (576,874 base pairs). This work was performed as part of the “Build-A-Genome China” course in Tianjin University. We corrected all mutations found—including duplications, substitutions, and indels—in the initial synV strain by using integrative cotransformation of the precise desired changes and by means of a clustered regularly interspaced short palindromic repeats (CRISPR)/CRISPR-associated protein 9 (Cas9)–based method. Altogether, 3331 corrected base pairs were required to match to the designed sequence. We generated a strain that exactly matches all designer sequence changes that displays high fitness under a variety of culture conditions. All corrections were verified with whole-genome sequencing; RNA sequencing revealed only minor changes in gene expression—most notably, decreases in expression of genes relocated near synthetic telomeres as a result of design. We constructed a functional circular synV (ring_synV) derivative in yeast by precisely joining both chromosome ends (telomeres) at specified coordinates. The ring chromosome showed restoration of subtelomeric gene expression levels. The ring_synV strain exhibited fitness comparable with that of the linear synV strain, revealed no change in sporulation frequency, but notably reduced spore viability. In meiosis, heterozygous or homozygous diploid ring_wtV and ring_synV chromosomes behaved similarly, exhibiting substantially higher frequency of the formation of zero-spore tetrads, a type that was not seen in the rod chromosome diploids. Rod synV chromosomes went through meiosis with high spore viability, despite no effort having been made to preserve meiotic competency in the design of synV. CONCLUSION The perfect designer-matched synthetic chromosome V provides strategies to edit sequence variants and correct unpredictable events, such as off-target integration of extra copies of synthetic DNA elsewhere in the genome. We also constructed a ring synthetic chromosome derivative and evaluated its fitness and stability in yeast. Both synV and synVI can be circularized and can power yeast cell growth without affecting fitness when gene content is maintained. These fitness and stability phenotypes of the ring synthetic chromosome in yeast provide a model system with which to probe the mechanism of human ring chromosome disorders. Synthesis, cyclization, and characterization of synV . ( A ) Synthetic chromosome V (synV, 536,024 base pairs) was designed in silico from native chromosome V (wtV, 576,874 base pairs), with extensive genotype modification designed to be phenotypically neutral. ( B ) CRISPR/Cas9 strategy for multiplex repair. ( C ) Colonies of wtV, synV, and ring_synV strains.
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Owe to fast developments in large-scale oligo synthesis, route A became more advanced in terms of cost and labor intensity and has been applied widely in recent studies.
“Owe to the fast developments in large-scale oligo synthesis, route A became more advanced in terms of cost and labor intensity and has been applied widely in recent studies”
From Large-Scale de Novo Oligonucleotide Synthesis for Whole-Genome Synthesis and Data Storage: Challenges and Opportunities (2021) · cites this paper as Xie et al., 2017
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- Authors
- Xie, Z.-X., Li, B.-Z., Mitchell, L. A., Wu, Y., Qi, X., Jin, Z., Jia, B., Wang, X., Zeng, B.-X., Liu, H.-M., Wu, X.-L., Feng, Q., Zhang, W.-Z., Liu, W., Ding, M.-Z., Li, X., Zhao, G.-R., Qiao, J.-J., Cheng, J.-S., Zhao, M., Kuang, Z., Wang, X., Martin, J. A., Stracquadanio, G., Yang, K., Bai, X., Zhao, J., Hu, M.-L., Lin, Q.-H., Zhang, W.-Q., Shen, M.-H., Chen, S., Su, W., Wang, E.-X., Guo, R., Zhai, F., Guo, X.-J., Du, H.-X., Zhu, J.-Q., Song, T.-Q., Dai, J.-J., Li, F.-F., Jiang, G.-Z., Han, S.-L., Liu, S.-Y., Yu, Z.-C., Yang, X.-N., Chen, K., Hu, C., Li, D.-S., Jia, N., Liu, Y., Wang, L.-T., Wang, S., Wei, X.-T., Fu, M.-Q., Qu, L.-M., Xin, S.-Y., Liu, T., Tian, K.-R., Li, X.-N., Zhang, J.-H., Song, L.-X., Liu, J.-G., Lv, J.-F., Xu, H., Tao, R., Wang, Y., Zhang, T.-T., Deng, Y.-X., Wang, Y.-R., Li, T., Ye, G.-X., Xu, X.-R., Xia, Z.-B., Zhang, W., Yang, S.-L., Liu, Y.-L., Ding, W.-Q., Liu, Z.-N., Zhu, J.-Q., Liu, N.-Z., Walker, R., Luo, Y., Wang, Y., Shen, Y., Yang, H., Cai, Y., Ma, P.-S., Zhang, C.-T., Bader, J. S., Boeke, J. D., & Yuan, Y.-J.
- Affiliations
- Tianjin University (CN)
- NYU Langone Health (US)
- Key Laboratory of Systems Bioengineering (Ministry of Education), School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, PR China.
- University of Essex (GB)
- Johns Hopkins University (US)
- BGI Group (China) (CN)
- University of Edinburgh (GB)
- Corresponding author
- Xie, Ze-Xiong
- Li, Bing-Zhi
- Yuan, Ying-Jin
- ORCID
- Xie, Ze-Xiong
- Li, Bing-Zhi
- Mitchell, Leslie A.
- Wu, Yi
- Jia, Bin
- Wang, Xia
- Zeng, Bo-Xuan
- Liu, Hui-Min
- Zhang, Wen-Zheng
- Liu, Wei
- Ding, Ming-Zhu
- Li, Xia
- Zhao, Guang-Rong
- Cheng, Jing-Sheng
- Zhao, Meng
- Kuang, Zheng
- Wang, Xuya
- Martin, J. Andrew
- Stracquadanio, Giovanni
- Yang, Kun
- Bai, Xue
- Zhao, Juan
- Chen, Si
- Zhai, Fang
- Song, Tian-Qing
- Chen, Ken
- Hu, Cheng
- Jia, Nan
- Liu, Yue
- Wang, Su
- Wei, Xiao-Tong
- Xin, Si-Yu
- Liu, Ting
- Xu, Hang
- Tao, Ran
- Li, Ting
- Xu, Xiao-Ran
- Zhang, Wei
- Liu, Zhen-Ning
- Walker, Roy
- Luo, Yisha
- Wang, Yun
- Shen, Yue
- Yang, Huanming
- Cai, Yizhi
- Zhang, Chun-Ting
- Bader, Joel S.
- Boeke, Jef D.
- Yuan, Ying-Jin
- Venue
- Science
- Published
- 2017-03-10
- Volume
- 355
- Issue
- 6329
- ISSN
- 0036-8075 (ISSN-L)
- 1095-9203
- OpenAlex
- W2607040243
- Cited by
- 255
- References
- 38
- Citations by year
- 2026: 13 · 2025: 17 · 2024: 22 · 2023: 21 · 2022: 33 · 2021: 33 · 2020: 18 · 2019: 33 · 2018: 38 · 2017: 27
- FWCI
- 12.96
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Science (publishedVersion)
- PubMed (publishedVersion)
- Open Access at Essex (University of Essex) (submittedVersion)
- Funders
- National Science Foundation (award287207)
- National Natural Science Foundation of China (award287208)
- Ministry of Science and Technology of the People’s Republic of China (award287209)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Fungal and yeast genetics research
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Microbial Metabolic Engineering and Bioproduction
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › CRISPR and Genetic Engineering
- Keywords
- genome synthesis, ring chromosomes, cyclization, meiosis, mitosis, CRISPR/Cas9 genome editing, sequence verification, genome rearrangement, synthetic biology education, dicentric chromosomes
- MeSH terms
- Gene Editing, CRISPR-Associated Protein 9, Bacterial Proteins, Endonucleases, Meiosis, Models, Genetic, Saccharomyces cerevisiae, Transformation, Genetic, Gene Rearrangement, Genome, Fungal, Chromosomes, Artificial, Yeast, Synthetic Biology, Clustered Regularly Interspaced Short Palindromic Repeats
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