Abstract:
AIM:To determine the structure of the chimeric chromosome X of bottom-fermenting yeasts. METHODS AND RESULTS:Eight cosmid clones carrying DNA from chromosome X of bottom-fermenting yeasts were selected by end-sequencing. Four of the cosmid clones had Saccharomyces cerevisiae (SC)-type and Saccharomyces bayanus (SB)-type chimeric ends, two had SC-type ends and two had SB-type ends. Sequencing revealed that the bottom-fermenting yeast strains in this study had four types of chromosome X: SC-SC, SC-SB, SB-SC and SB-SB. The translocation site in the chimeric chromosome is conserved among bottom-fermenting yeast strains, and was created by homologous recombination within a region of high sequence identity between the SC-type sequence and the SB-type sequence. CONCLUSIONS:Existing bottom-fermenting yeast strains share a common ancestor in which the chimeric chromosome X was generated. SIGNIFICANCE AND IMPACT OF THE STUDY:The knowledge gained in this study sheds light on the evolution of bottom-fermenting yeasts.
journal_name
J Appl Microbioljournal_title
Journal of applied microbiologyauthors
Ogata T,Izumikawa M,Tadami Hdoi
10.1111/j.1365-2672.2009.04289.xsubject
Has Abstractpub_date
2009-10-01 00:00:00pages
1098-107issue
4eissn
1364-5072issn
1365-2672pii
JAM4289journal_volume
107pub_type
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