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. 1987 Jan;7(1):68–75. doi: 10.1128/mcb.7.1.68

Alterations in the adenine-plus-thymine-rich region of CEN3 affect centromere function in Saccharomyces cerevisiae.

A Gaudet, M Fitzgerald-Hayes
PMCID: PMC365042  PMID: 3550426

Abstract

Centromere DNA from 11 of the 16 chromosomes of the yeast Saccharomyces cerevisiae have been analyzed and reveal three sequence elements common to each centromere, referred to as conserved centromere DNA elements (CDE). The adenine-plus-thymine (A + T)-rich central core element, CDE II, is flanked by two short conserved sequences, CDE I (8 base pairs [bp]) and CDE III (25 bp). Although no consensus sequence exists among the different CDE II regions, they do have three common features of sequence organization. First, the CDE II regions are similar in length, ranging from 78 to 86 bp measured from CDE I to the left boundary of CDE III. Second, the base composition is always greater than 90% A + T. Finally, the A and T residues in these segments are often arranged in runs of A and runs of T residues, sometimes with six or seven bases in a stretch. We constructed insertion, deletion, and replacement mutations in the CDE II region of the centromere from chromosome III, CEN3, designed to investigate the length and sequence requirements for function of the CDE II region of the centromere. We analyzed the effect of these altered centromeres on plasmid and chromosome segregation in S. cerevisiae. Our results show that increasing the length of CDE II from 84 to 154 bp causes a 100-fold increase in chromosome nondisjunction. Deletion mutations removing segments of the A + T-rich CDE II DNA also cause aberrant segregation. In some cases partial function could be restored by replacing the deleted DNA with fragments whose primary sequence or base composition is very different from that of the wild-type CDE II DNA. In addition, we found that identical mutations introduced into different positions in CDE II have very similar effects.

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Selected References

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