Lack of positional requirements for autonomously replicating sequence elements on artificial yeast chromosomes.

R. J. Wellinger, V. A. Zakian

Research output: Contribution to journalArticle

36 Scopus citations

Abstract

In the yeast Saccharomyces cerevisiae, origins of replication (autonomously replicating sequences; ARSs), centromeres, and telomeres have been isolated and characterized. The identification of these structures allows the construction of artificial chromosomes in which the architecture of eukaryotic chromosomes may be studied. A common feature of most, and possibly all, natural yeast chromosomes is that they have an ARS within 2 kilobases of their physical ends. To study the effects of such telomeric ARSs on chromosome maintenance, we introduced artificial chromosomes of approximately 15 and 60 kilobases into yeast cells and analyzed the requirements for telomeric ARSs and the effects of ARS-free chromosomal arms on the stability of these molecules. We find that terminal blocks of telomeric repeats are sufficient to be recognized as telomeres. Moreover, artificial chromosomes containing telomere-associated Y' sequences and telomeric ARSs were no more stable during both mitosis and meiosis than artificial chromosomes lacking terminal ARSs, indicating that yeast-specific blocks of telomeric sequences are the only cis-acting requirement for a functional telomere during both mitotic growth and meiosis. The results also show that there is no requirement for an origin of replication on each arm of the artificial chromosomes, indicating that a replication fork may efficiently move through a functional centromere region.

Original languageEnglish (US)
Pages (from-to)973-977
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Volume86
Issue number3
DOIs
StatePublished - Feb 1989

All Science Journal Classification (ASJC) codes

  • General

Fingerprint Dive into the research topics of 'Lack of positional requirements for autonomously replicating sequence elements on artificial yeast chromosomes.'. Together they form a unique fingerprint.

Cite this