Exploring the genomes of Frankia

The recent determination of the genome sequence of three Frankia strains has highlighted the evolutionary forces that have shaped the genetic makeup of the actinorhizal symbionts and it has opened up many avenues of research. Instances of gene duplication, gene loss and gene acquisition through late...

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Bibliographic Details
Published in:Physiologia Plantarum (København. 1948) 2007-07, Vol.130 (3), p.331-343
Main Authors: Normand, Philippe, Queiroux, Clothilde, Tisa, Louis S, Benson, David R, Rouy, Zoé, Cruveiller, Stéphane, Médigue, Claudine
Format: Article
Language:English
Subjects:
Biochemistry, Molecular Biology
Biodiversity and Ecology
Biological and medical sciences
Environmental Sciences
Frankia
Fundamental and applied biological sciences. Psychology
Genes. Genome
Genomics
Life Sciences
Molecular and cellular biology
Molecular genetics
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Summary:The recent determination of the genome sequence of three Frankia strains has highlighted the evolutionary forces that have shaped the genetic makeup of the actinorhizal symbionts and it has opened up many avenues of research. Instances of gene duplication, gene loss and gene acquisition through lateral transfer show that the three Frankia genomes are dynamic and have evolved as a function of their host characteristics and biogeography. No convincing nod gene cluster or significant symbiotic island could be discerned. All the genes presently known to be involved in the symbiosis (nif, hup1 and hup2, shc) are found spread over the genome in at least four clusters. The results will be discussed with emphasis on understanding the mechanisms underlying the interaction and link between evolutionary forces and ecological adaptation to different biotopes.
ISSN:0031-9317
1399-3054
DOI:10.1111/j.1399-3054.2007.00918.x