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Genetic dissection of centromere function

I G Schulman1, K Bloom

  • 1Department of Biology, University of North Carolina, Chapel Hill 27599-3280.

Molecular and Cellular Biology
|June 1, 1993
PubMed
Summary
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Researchers identified the minimal functional unit of Saccharomyces cerevisiae centromeres, CDE III, using a novel in vivo system. This unit is essential for DNA-protein complex assembly and plasmid copy number control, independent of chromosome segregation.

Area of Science:

  • Molecular Biology
  • Yeast Genetics
  • Chromosomal Dynamics

Background:

  • Centromeres are critical chromosomal regions essential for accurate DNA segregation during cell division.
  • Understanding the minimal functional unit of centromeres is key to deciphering their complex roles in genome stability.
  • Previous studies have focused on centromere function in segregation, often overlooking pre-segregation assembly steps.

Purpose of the Study:

  • To develop and utilize a novel in vivo system for detecting minimal centromere function in Saccharomyces cerevisiae.
  • To identify the essential DNA elements and protein interactions required for centromere function independent of chromosome segregation.
  • To investigate the impact of centromere assembly on plasmid copy number control and its potential trans-acting effects on chromosome segregation.

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Main Methods:

  • Development of a system to detect minimal centromere function in vivo using Saccharomyces cerevisiae.
  • Analysis of centromere DNA mutants in a plasmid copy number control assay.
  • Assessment of the ability of CDE III to assemble DNA-protein complexes and its effect on artificial chromosome stability.

Main Results:

  • A minimal centromere unit, CDE III, was identified and shown to be active in plasmid copy number control independently of segregation.
  • Centromere-mediated plasmid copy number control directly correlates with the assembly of a DNA-protein complex involving CDE III.
  • Excess CDE III copies led to increased loss of an artificial chromosome, demonstrating negative trans-acting effects on segregation.

Conclusions:

  • The study defines CDE III as the minimal centromere unit responsible for DNA-protein complex assembly and copy number control.
  • The plasmid copy number control assay effectively characterizes centromere assembly steps preceding chromosome segregation.
  • Segregationally impaired centromeres can exert dominant negative effects on the segregation of other chromosomes.