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Evaluation of Heterologous ARS Activity in S. Cerevisiae Using Cloned DNA from S. Pombe

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Specialty Biochemistry
Date 1985 May 24
PMID 3892482
Citations 31
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Abstract

Cloned segments of Schizosaccharomyces pombe genomic DNA were screened for ARS activity in the native host, S. pombe, using high frequency transformation, phenotypic instability and extrachromosomal maintenance of unrearranged plasmid sequences as criteria for ARS function. This analysis revealed 12 ARS elements in a total of 230 kb of chromosomal DNA, indicating an average frequency of one ARS every 19 kb of genomic DNA. We then used these clones to assess the reliability of the S. cerevisiae assay for detecting ARS elements in heterologous DNA. The results show that not only does the S. cerevisiae assay fail to detect a large proportion of true ARS elements but it also wrongly identifies a significant proportion of clones which did not display ARS activity in the native host. We would therefore recommend restraint when extrapolating from observed ARS function of heterologous DNA in S. cerevisiae to a presumed analogous role in the original host.

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