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. 1990 Jan;124(1):27–38. doi: 10.1093/genetics/124.1.27

Genetic Instability of Clathrin-Deficient Strains of Saccharomyces Cerevisiae

S K Lemmon 1, C Freund 1, K Conley 1, E W Jones 1
PMCID: PMC1203907  PMID: 2407603

Abstract

Saccharomyces cerevisiae strains carrying a mutation in the clathrin heavy chain gene (CHC1) are genetically unstable and give rise to heterogeneous populations of cells. Manifestations of the instability include increases in genome copy number as well as compensatory genetic changes that allow better growing clathrin-deficient cells to take over the population. Increases in genome copy number appear to result from changes in ploidy as well as alterations in normal nuclear number. Genetic background influences the frequency at which cells with increased genome content are observed in different Chc(-) strains. We cannot distinguish whether genetic background affects the rate at which aberrant nuclear division events occur or a growth advantage of cells with increased nuclear and/or genome content. However, survival of chc1-Δ cells does not require an increase in genome copy number. The clathrin heavy chain gene was mapped 1-2 cM distal to KEX1 on the left arm of chromosome VII by making use of integrated 2μ plasmid sequences to destabilize distal chromosome segments and allow ordering of the genes.

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Selected References

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