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Molecular analysis of an Integrative Conjugative Element, ICEH, present in the chromosome of different strains of Mycoplasma hyopneumoniae

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Molecular analysis of an Integrative Conjugative Element, ICEH, present in the chromosome of different strains of Mycoplasma hyopneumoniae

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Título Molecular analysis of an Integrative Conjugative Element, ICEH, present in the chromosome of different strains of Mycoplasma hyopneumoniae
Autor Pinto, Paulo Marcos
Carvalho, Marcos Oliveira de
Alves Júnior, Leonardo
Brocchi, Marcelo
Schrank, Irene Silveira
Abstract Diversification of bacterial species and pathotypes is largely caused by lateral gene transfer (LGT) of diverse mobile DNA elements such as plasmids, phages, transposons and genomic islands. Thus, acquisition of new phenotypes by LGT is very important for bacterial evolution and relationship with hosts. This paper reports a 23 kb region containing fourteen CDSs with similarity to the previous described Integrative Conjugal Element of Mycoplasma fermentans (ICEF). This element, named ICEH, is present as one copy at distinct integration sites in the chromosome of 7448 and 232 pathogenic strains and is absent in the type strain J (non-pathogenic). Notable differences in the nucleotide composition of the insertion sites were detected, and could be correlated to a lack of specificity of the ICEH integrase. Although present in strains of the same organism, the ICEH elements are more divergent than the typical similarity between other chromosomal locus of Mycoplasma hyopneunomiae, suggesting an accelerated evolution of these constins or an ongoing process of degeneration, while maintaining conservation of the tra genes. An extrachromosomal form of this element had been detected in the 7448 strain, suggesting a possible involvement in its mobilization and transference of CDSs to new hosts.
Contido em Genetics and molecular biology. Ribeirão Preto. Vol. 30, n. 1 suppl. (mar. 2007), p. 256-263
Assunto Genética
Genoma
Mycoplasma hyopneumoniae
[en] Constins
[en] LGT
Origem Nacional
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/23399
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