title: Genomic structural variation contributes to phenotypic change of industrial bioethanol yeast Saccharomyces cerevisiae.
abstract: Genomic structural variation (GSV) is a ubiquitous phenomenon observed in the genomes of Saccharomyces cerevisiae strains with different genetic backgrounds; however, the physiological and phenotypic effects of GSV are not well understood. Here, we first revealed the genetic characteristics of a widely used industrial S. cerevisiae strain, ZTW1, by whole genome sequencing. ZTW1 was identified as an aneuploidy strain and a large-scale GSV was observed in the ZTW1 genome compared with the genome of a diploid strain YJS329. These GSV events led to copy number variations (CNVs) in many chromosomal segments as well as one whole chromosome in the ZTW1 genome. Changes in the DNA dosage of certain functional genes directly affected their expression levels and the resultant ZTW1 phenotypes. Moreover, CNVs of large chromosomal regions triggered an aneuploidy stress in ZTW1. This stress decreased the proliferation ability and tolerance of ZTW1 to various stresses, while aneuploidy response stress may also provide some benefits to the fermentation performance of the yeast, including increased fermentation rates and decreased byproduct generation. This work reveals genomic characters of the bioethanol S. cerevisiae strain ZTW1 and suggests that GSV is an important kind of mutation that changes the traits of industrial S. cerevisiae strains.
authors.affiliation: College of Life Science, Zhejiang University, Hangzhou 310058, Zhejiang Province, China.
authors.forename: Ke
authors.initials: K
authors.lastname: Zhang
authors.affiliation: College of Life Science, Zhejiang University, Hangzhou 310058, Zhejiang Province, China.
authors.forename: Li-Jie
authors.initials: LJ
authors.lastname: Zhang
authors.affiliation: College of Life Science, Zhejiang University, Hangzhou 310058, Zhejiang Province, China.
authors.forename: Ya-Hong
authors.initials: YH
authors.lastname: Fang
authors.affiliation: College of Life Science, Zhejiang University, Hangzhou 310058, Zhejiang Province, China.
authors.forename: Xin-Na
authors.initials: XN
authors.lastname: Jin
authors.affiliation: Ocean College, Zhejiang University, Hangzhou 310058, Zhejiang Province, China.
authors.forename: Lei
authors.initials: L
authors.lastname: Qi
authors.affiliation: College of Life Science, Zhejiang University, Hangzhou 310058, Zhejiang Province, China.
authors.forename: Xue-Chang
authors.initials: XC
authors.lastname: Wu
authors.affiliation: Ocean College, Zhejiang University, Hangzhou 310058, Zhejiang Province, China zhengdaoqiong@zju.edu.cn.
authors.forename: Dao-Qiong
authors.initials: DQ
authors.lastname: Zheng
mesh_terms: D000431:Ethanol / Q000378:metabolism*; D018628:Gene Dosage; D056914:Genomic Structural Variation; D053858:Metabolic Networks and Pathways / Q000235:genetics*; D010641:Phenotype; D011003:Ploidies; D012441:Saccharomyces cerevisiae / Q000235:genetics* / Q000378:metabolism*; D017422:Sequence Analysis, DNA
chemical_list: D000431:Ethanol
keywords: Saccharomyces cerevisiae; and stress tolerance; ethanol fermentation; genomic structural variation; whole-genome sequencing