Random exploration of the Kluyveromyces lactis genome and comparison with that of Saccharomyces cerevisiae - PubMed

Comparative Study

Random exploration of the Kluyveromyces lactis genome and comparison with that of Saccharomyces cerevisiae

O Ozier-Kalogeropoulos et al. Nucleic Acids Res. 1998.

Abstract

The genome of the yeast Kluyveromyces lactis was explored by sequencing 588 short tags from two random genomic libraries (random sequenced tags, or RSTs), representing altogether 1.3% of the K. lactis genome. After systematic translation of the RSTs in all six possible frames and comparison with the complete set of proteins predicted from the Saccharomyces cerevisiae genomic sequence using an internally standardized threshold, 296 K.lactis genes were identified of which 292 are new. This corresponds to approximately 5% of the estimated genes of this organism and triples the total number of identified genes in this species. Of the novel K.lactis genes, 169 (58%) are homologous to S.cerevisiae genes of known or assigned functions, allowing tentative functional assignment, but 59 others (20%) correspond to S.cerevisiae genes of unknown function and previously without homolog among all completely sequenced genomes. Interestingly, a lower degree of sequence conservation is observed in this latter class. In nearly all instances in which the novel K.lactis genes have homologs in different species, sequence conservation is higher with their S.cerevisiae counterparts than with any of the other organisms examined. Conserved gene order relationships (synteny) between the two yeast species are also observed for half of the cases studied.

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