Abstract
The mother–bud neck is defined as the boundary between the mother cell and bud in budding microorganisms, wherein sequential morphological events occur throughout the cell cycle. This study was designed to quantitatively investigate the morphology of the mother–bud neck in budding yeast Saccharomyces cerevisiae. Observation of yeast cells with time-lapse microscopy revealed an increase of mother–bud neck size through the cell cycle. After screening of yeast non-essential gene-deletion mutants with the image processing software CalMorph, we comprehensively identified 274 mutants with broader necks during S/G2 phase. Among these yeasts, we extensively analyzed 19 representative deletion mutants with defects in genes annotated to six gene ontology terms (polarisome, actin reorganization, endosomal tethering complex, carboxy-terminal domain protein kinase complex, DNA replication, and maintenance of DNA trinucleotide repeats). The representative broad-necked mutants exhibited calcofluor white sensitivity, suggesting defects in their cell walls. Correlation analysis indicated that maintenance of mother–bud neck size is important for cellular processes such as cell growth, system robustness, and replicative lifespan. We conclude that neck-size maintenance in budding yeast is regulated by numerous genes and has several aspects that are physiologically significant.
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Acknowledgements
We would like to thank Bhumil Patel and Brian Kennedy for sharing unpublished data of RLS, and Satoshi Yoshida and staff of Signal Transduction for their helpful discussions. This work was supported by Grants-in-Aid of Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology, Japan (15H04402 to Y.O., 16H04898 to M.M.), and a National Institutes of Health Grant (GM115420 to E.B.).
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Communicated by M. Kupiec.
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Fig. S1
Lengths calculated from GFP-Ras2 signals were quantified every 3 or 4 min after bud emergence (0 min). Lines with different colors show approximately linear gamma distributions of the 15 different cells examined. (PDF 773 KB)
Fig. S2
Phenotypic potential of 114 wide-neck mutants detected during M phase and other mutants. Red and gray lines indicate regression lines of the 114 wide-neck mutants and others. * indicate significant differences at P < 0.01, as determined via t test. (PDF 3034 KB)
Table S1
Mutants with abnormal neck size. (XLSX 84 KB)
Table S2
CW-sensitivity and neck-width of the 28 mutants deleted with the genes annotated to the six GO terms. (XLSX 36 KB)
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Kubo, K., Okada, H., Shimamoto, T. et al. Implications of maintenance of mother–bud neck size in diverse vital processes of Saccharomyces cerevisiae. Curr Genet 65, 253–267 (2019). https://doi.org/10.1007/s00294-018-0872-2
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DOI: https://doi.org/10.1007/s00294-018-0872-2