中科院在沪宣布：我国实现生物学里程碑式突破 - 2018年08月03日

Local scientists have created the world’s first strain of yeast with only one chromosome, a breakthrough intended to support research on human cell aging and genetic mutation.
The team behind the new strain was led by Dr Qin Zhongjun, a molecular biologist from a Shanghai-based research center affiliated with the Chinese Academy of Sciences. Dr Qin and his fellow researchers spent four years on the yeast, and conducted 15 rounds of end-to-end fusion to create a single-chromosome strain.
Other strains of yeast have 16 linear chromosomal pairs.