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Structural and functional analysis of a yeast centromere (CEN3).
Journal of Cell Science. Supplement
|January 1, 1984
Summary
Researchers analyzed yeast centromere function by altering DNA sequences. They identified a minimal 289 bp DNA fragment essential for centromere activity, crucial for accurate chromosome segregation during cell division.
Area of Science:
- Molecular Biology
- Genetics
- Cell Biology
Background:
- Centromeres are essential chromosomal regions for accurate segregation during cell division.
- Understanding yeast centromere structure is key to deciphering fundamental mechanisms of chromosome inheritance.
Purpose of the Study:
- To perform structure-function analysis of the yeast centromere 3 (CEN3) by modifying its DNA sequence.
- To identify the minimal DNA fragment required for CEN3 function.
Main Methods:
- Construction of a centromere substitution vector (pJC3-13) for replacing the native CEN3 with assayed DNA sequences.
- Transformation of yeast strains with linear DNA fragments to assess centromere activity.
- Analysis of chromosome behavior during mitotic and meiotic divisions.
Main Results:
- A 289 base-pair (bp) DNA fragment from the CEN3 region retains full centromere function.
- Centromere function is orientation-independent, and CEN11 can substitute for CEN3.
- Specific regions (II and III) within the centromere are critical for function; alterations lead to partial activity and abnormal meiotic segregation.
Conclusions:
- The minimal functional unit of the yeast centromere has been defined.
- Specific DNA elements within the centromere are indispensable for proper chromosome segregation.
- Deviations in centromere structure can result in aneuploidy and meiotic instability.