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Amn1 governs post-mitotic cell separation in Saccharomyces cerevisiae.

Ou Fang1,2,3, Xiaohua Hu1, Lin Wang1

  • 1Laboratory of Population and Quantitative Genetics, Institute of Biostatistics and Genetics, School of Life Sciences, Fudan University, Shanghai, China.

Plos Genetics
|October 2, 2018
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Summary

Researchers identified AMN1 as a key gene regulating cell separation in yeast. AMN1 controls the Ace2 protein, impacting cell division and preventing yeast clumping, with conserved functions across species.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genetics

Background:

  • Post-mitotic cell separation is crucial for eukaryotic cell cycles but remains incompletely understood.
  • The budding yeast Saccharomyces cerevisiae serves as a model for studying fundamental biological processes.

Purpose of the Study:

  • To identify and characterize genes involved in post-mitotic cell separation in Saccharomyces cerevisiae.
  • To elucidate the molecular mechanisms by which cell separation is regulated.

Main Methods:

  • Utilized Saccharomyces cerevisiae (budding yeast) as a model organism.
  • Employed ChIP assays and site-specific mutation experiments.
  • Investigated gene regulation and protein interactions, including proteolysis via the ubiquitin proteasome system.

Main Results:

  • Identified AMN1 as a major gene regulating cell separation in a natural yeast strain (YL1C).
  • Defined a novel 11-residue domain in Amn1 for Ace2 binding and demonstrated Amn1 induces Ace2 proteolysis, down-regulating septum hydrolysis genes.
  • Showed Ste12 and the a1-α12 heterodimer directly regulate AMN1, with a1-α12 preventing Ste12-mediated inactivation, highlighting cell-type dependency.
  • Confirmed AMN1368D as a dominant allele in S. cerevisiae, conserved in K. lactis and C. glabrata.

Conclusions:

  • AMN1 plays a critical role in inhibiting cell separation and causing haploid yeast cell clumping by regulating Ace2.
  • AMN1's regulation by Ste12 and a1-α12 demonstrates cell-type-specific control of cell separation.
  • The identified dominant allele and conserved nature of AMN1 suggest its evolutionary significance in yeast species.