September 22, 2019  |  

Creating a functional single-chromosome yeast.

Authors: Shao, Yangyang and Lu, Ning and Wu, Zhenfang and Cai, Chen and Wang, Shanshan and Zhang, Ling-Li and Zhou, Fan and Xiao, Shijun and Liu, Lin and Zeng, Xiaofei and Zheng, Huajun and Yang, Chen and Zhao, Zhihu and Zhao, Guoping and Zhou, Jin-Qiu and Xue, Xiaoli and Qin, Zhongjun

Eukaryotic genomes are generally organized in multiple chromosomes. Here we have created a functional single-chromosome yeast from a Saccharomyces cerevisiae haploid cell containing sixteen linear chromosomes, by successive end-to-end chromosome fusions and centromere deletions. The fusion of sixteen native linear chromosomes into a single chromosome results in marked changes to the global three-dimensional structure of the chromosome due to the loss of all centromere-associated inter-chromosomal interactions, most telomere-associated inter-chromosomal interactions and 67.4% of intra-chromosomal interactions. However, the single-chromosome and wild-type yeast cells have nearly identical transcriptome and similar phenome profiles. The giant single chromosome can support cell life, although this strain shows reduced growth across environments, competitiveness, gamete production and viability. This synthetic biology study demonstrates an approach to exploration of eukaryote evolution with respect to chromosome structure and function.

Journal: Nature
DOI: 10.1038/s41586-018-0382-x
Year: 2018

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