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Evidence for a new chromosome in Saccharomyces cerevisiae.

ABSTRACT

The current yeast map has 16 chromosomes, each originally defined by a centromere-linked gene unlinked to previously defined centromere markers. We examined four genes, cly2, KRB1, AMY2, and tsm0115, each centromere linked, but previously thought to be not on chromosomes I to XVI. We found that AMY2 is linked to cly2, and both are on chromosome II. tsm0115 is on the left arm of chromosome XVI. We confirm the earlier evidence that KRB1 is not on chromosomes I through XVI. This gene thus defines a new chromosome XVII. We also report meiotic linkage of met4 and pet8 (on chromosome XIV), confirming the connection between the petx-kex2 fragment of XIV and the centromere of XIV.