Title

Genetic and genomic analysis of the AT-rich centromere DNA element II of Saccharomyces cerevisiae

UMMS Affiliation

Department of Molecular Genetics and Microbiology

Publication Date

8-5-2005

Document Type

Article

Subjects

AT Rich Sequence; Base Composition; Base Sequence; Centromere; Chromosomes, Fungal; Computational Biology; DNA Primers; DNA, Fungal; Gene Library; Genomics; Molecular Sequence Data; Saccharomyces cerevisiae; Sequence Analysis, DNA

Disciplines

Life Sciences | Medicine and Health Sciences

Abstract

Centromere DNA element II (CDEII) of budding yeast centromeres is an AT-rich sequence essential for centromere (CEN) function. Sequence analysis of Saccharomyces cerevisiae CDEIIs revealed that A(5-7)/T(5-7) tracts are statistically overrepresented at the expense of AA/TT and alternating AT. To test the hypothesis that this nonrandom sequence organization is functionally important, a CEN library in which the CDEII sequences were randomized was generated. The library was screened for functional and nonfunctional members following centromere replacement in vivo. Functional CENs contained CDEIIs with the highly biased A(n)/T(n) run distribution of native centromeres, while nonfunctional CDEIIs resembled those picked from the library at random. Run content, defined as the fraction of residues present in runs of four or more nucleotides, of the functional and nonfunctional CDEII populations differed significantly (P < 0.001). Computer searches of the genome for regions with an A + T content comparable to CDEIIs revealed that such loci are not unique to centromeres, but for 14 of the 16 chromosomes the AT-rich locus with the highest A(n > or =4) + T(n > or =4) run content was the centromere. Thus, the distinctive and nonrandom sequence organization of CDEII is important for centromere function and possesses informational content that could contribute to the determination of centromere identity.

Rights and Permissions

Citation: Genetics. 2005 Dec;171(4):1463-75. Epub 2005 Aug 3. Link to article on publisher's site

Related Resources

Link to Article in PubMed

Journal/Book/Conference Title

Genetics

PubMed ID

16079225