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Genetic diversity and population structure of Aeromonas hydrophila , Aer. bestiarum , Aer. salmonicida and Aer. popoffii by multilocus enzyme electrophoresis (MLEE)
Author(s) -
MiñanaGalbis David,
Farfán Maribel,
Fusté M. Carme,
Lorén J. Gaspar
Publication year - 2004
Publication title -
environmental microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.954
H-Index - 188
eISSN - 1462-2920
pISSN - 1462-2912
DOI - 10.1046/j.1462-2920.2004.00554.x
Subject(s) - biology , genetic diversity , genetic distance , aeromonas salmonicida , locus (genetics) , population , genetics , allele , aeromonas hydrophila , population genetics , genetic variation , genetic structure , zoology , bacteria , gene , demography , sociology
Summary Genetic diversity, genetic relationship, identification and population structure of 120 Aeromonas strains (including Aer. hydrophila , Aer. bestiarum , Aer. salmonicida and Aer. popoffii ) isolated from various sources were studied by analysis of 15 genetic loci by multilocus enzyme electrophoresis (MLEE). All 15 loci were polymorphic, with an average of 9.4 alleles per locus and a mean genetic diversity ( H ) of 0.64. Cluster analysis defined at H ≤ 0.7 differentiated most of the taxa analysed except the Aer. popoffii and Aer. bestiarum strains, which showed a close genetic relationship. Allelic frequencies of five loci (EST1, HEX, IDH, LDH1 and MDH) identified 94% of the strains. The index of association ( I A ) for the total sample was 2.38 and I A values calculated for the different populations were always significantly different from zero. These results suggest that the population structure of this Aeromonas sample is strongly clonal, confirm the taxonomic status of the analysed species in population genetics terms, and show the usefulness of MLEE for identifying Aeromonas species.