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Mol Cell Biol. 1991 April; 11(4): 2206-2215

Identification of DNA regions required for mitotic and meiotic functions within the centromere of Schizosaccharomyces pombe chromosome I.

K M Hahnenberger, J Carbon and L Clarke

Department of Biological Sciences, University of California, Santa Barbara 93106.

ABSTRACT

We have determined the structural organization and functional roles of centromere-specific DNA sequence repeats in cen1, the centromere region from chromosome I of the fission yeast Schizosaccharomyces pombe. cen1 is composed of various classes of repeated sequences designated K', K"(dgl), L, and B', arranged in a 34-kb inverted repeat surrounding a 4- to 5-kb nonhomologous central core. Artificial chromosomes containing various portions of the cen1 region were constructed and assayed for mitotic and meiotic centromere function in S. pombe. Deleting K' and L from the distal portion of one arm of the inverted repeat had no effect on mitotic centromere function but resulted in greatly increased precocious sister chromatid separation in the first meiotic division. A centromere completely lacking K' and L, but containing the central core, one copy of B' and K" in one arm, and approximately 2.5 kb of the core-proximal portion of B' in the other arm, was also fully functional mitotically but again did not maintain sister chromatid attachment in meiosis I. However, deletion of K" from this minichromosome resulted in complete loss of centromere function. Thus, one copy of at least a portion of the K" (dgl) repeat is absolutely required but is not sufficient for S. pombe centromere function. The long centromeric inverted-repeat region must be relatively intact to maintain sister chromatid attachment in meiosis I.

Mol Cell Biol. 1991 April; 11(4): 2206-2215




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