IBBM   21076
INSTITUTO DE BIOTECNOLOGIA Y BIOLOGIA MOLECULAR
Unidad Ejecutora - UE
capítulos de libros
Título:
Horizontal Gene Transfer, generalities and lessons from rhizobia
Autor/es:
TORRES TEJERIZO, G. A.; GIUSTI, M. A.; DEL PAPA M. F.; LOZANO, M. J.; DRAGHI, W. O.; JOFRE, E.; LAGARES A.; PISTORIO, M.
Libro:
Bacterial Populations: Basic and Applied Aspects of Their Structure and Evolution
Editorial:
Transworld Research Network
Referencias:
Lugar: Kerala, India; Año: 2010; p. 66 - 89
Resumen:
One of the evolutionary mechanisms that defy the
understanding of the dynamics of bacterial genome is Horizontal
Gene Transfer (HGT), which has been most recently evident with
the massive sequencing of genomes. The HGT material together
with the processes of transposition and recombination are the
principal mechanisms that operate in prokaryote genome evolution.
The acquisition of new DNA via horizontal genetic transfer can
even promote speciation among bacterial lineages The HGT
between bacteria is accomplished by at least three known
mechanisms: transformation, transduction and conjugation. Within
this context, special attention has been paid to the transfer of
genetic material in bacteria via plasmid conjugation since this
mechanism is considered one of most efficient means of
DNA exchange among prokaryotes. In several rhizobia, bacteria that
inhabit the soil in free-living conditions and associate in symbiosis with the root of
legumes as nitrogen-fixing organisms, plasmid DNA could constitute a very high
percentage of the genome. Conjugal transfer of rhizobial plasmids has been well
documented since decades ago both for symbiotic and for cryptic plasmids or
mobilizable. The wide distribution of mobile genetic elements in rhizobia makes the
functional and phenotypic study of them a relevant focus of analysis to understand the
mechanisms of adaptation, speciation and the genomes plasticity of soil
microorganisms.
inhabit the soil in free-living conditions and associate in symbiosis with the root of
legumes as nitrogen-fixing organisms, plasmid DNA could constitute a very high
percentage of the genome. Conjugal transfer of rhizobial plasmids has been well
documented since decades ago both for symbiotic and for cryptic plasmids or
mobilizable. The wide distribution of mobile genetic elements in rhizobia makes the
functional and phenotypic study of them a relevant focus of analysis to understand the
mechanisms of adaptation, speciation and the genomes plasticity of soil
microorganisms.
inhabit the soil in free-living conditions and associate in symbiosis with the root of
legumes as nitrogen-fixing organisms, plasmid DNA could constitute a very high
percentage of the genome. Conjugal transfer of rhizobial plasmids has been well
documented since decades ago both for symbiotic and for cryptic plasmids or
mobilizable. The wide distribution of mobile genetic elements in rhizobia makes the
functional and phenotypic study of them a relevant focus of analysis to understand the
mechanisms of adaptation, speciation and the genomes plasticity of soil
microorganisms.