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Applied and Environmental Microbiology, December 2004, p. 7210-7219, Vol. 70, No. 12
0099-2240/04/$08.00+0     DOI: 10.1128/AEM.70.12.7210-7219.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Allelic Diversity and Population Structure in Oenococcus oeni as Determined from Sequence Analysis of Housekeeping Genes

Blanca de las Rivas, Ángela Marcobal, and Rosario Muñoz*

Instituto de Fermentaciones Industriales, CSIC, Madrid, Spain

Received 8 June 2004/ Accepted 20 July 2004

Oenococcus oeni is the organism of choice for promoting malolactic fermentation in wine. The population biology of O. oeni is poorly understood and remains unclear. For a better understanding of the mode of genetic variation within this species, we investigated by using multilocus sequence typing (MLST) with the gyrB, pgm, ddl, recP, and mleA genes the genetic diversity and genetic relationships among 18 O. oeni strains isolated in various years from wines of the United States, France, Germany, Spain, and Italy. These strains have also been characterized by ribotyping and restriction fragment length polymorphism (RFLP) analysis of the PCR-amplified 16S-23S rRNA gene intergenic spacer region (ISR). Ribotyping grouped the strains into two groups; however, the RFLP analysis of the ISRs showed no differences in the strains analyzed. In contrast, MLST in oenococci had a good discriminatory ability, and we have found a higher genetic diversity than indicated by ribotyping analysis. All sequence types were represented by a single strain, and all the strains could be distinguished from each other because they had unique combinations of alleles. Strains assumed to be identical showed the same sequence type. Phylogenetic analyses indicated a panmictic population structure in O. oeni. Sequences were analyzed for evidence of recombination by split decomposition analysis and analysis of clustered polymorphisms. All results indicated that recombination plays a major role in creating the genetic heterogeneity of O. oeni. A low standardized index of association value indicated that the O. oeni genes analyzed are close to linkage equilibrium. This study constitutes the first step in the development of an MLST method for O. oeni and the first example of the application of MLST to a nonpathogenic food production bacteria.

* Corresponding author. Mailing address: Departamento de Microbiología, Instituto de Fermentaciones Industriales, CSIC, Juan de la Cierva 3, 28006 Madrid, Spain. Phone: 34 91 562 2900. Fax: 34 91 564 4853. E-mail: rmunoz{at}ifi.csic.es.

Applied and Environmental Microbiology, December 2004, p. 7210-7219, Vol. 70, No. 12
0099-2240/04/$08.00+0     DOI: 10.1128/AEM.70.12.7210-7219.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.



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