Record ID No. |
6125 |
Author(s) |
Salvioli di Fossalunga A.*, Lipuma J., Venice F., Dupont L. and Bonfante P. , 2017 |
Affiliation |
*Department of Life Sciences and Systems Biology, University of Torino, Torino, Italy. |
Title |
The endobacterium of an arbuscular mycorrhizal fungus modulates the expression of its toxin-antitoxin systems during he life cycle of its host. |
Source. Vol.(no):Page |
The ISME Journal. 11(10): 2394-2398. |
Categories |
Arbuscular Mycorrhiza |
Subjects |
Biological Interaction Genetics |
Host |
NA |
Organism |
Candidatus Glomeribacter gigasporarum |
Country |
Italy |
Abstracts |
Arbuscular mycorrhizal fungi (AMF) are widespread root symbionts that perform important ecological services, such as improving plant nutrient and water acquisition. Some AMF from the Gigasporaceae family host a population of endobacteria, Candidatus Glomeribacter gigasporarum (Cagg). The analysis of the Cagg genome identified six putative toxin–antitoxin modules (TAs), consisting of pairs of stable toxins and unstable antitoxins that affect diverse physiological functions. Sequence analysis suggested that these TA modules were acquired by horizontal transfer. Gene expression patterns of two TAs (yoeB/yefM and chpB/chpS) changed during the fungal life cycle, with the expression during the pre-symbiotic phase higher than during the symbiosis with the plant host. The heterologous expression in Escherichia coli demonstrated the functionality only for the YoeB–YefM pair. On the basis of these observations, we speculate that TA modules might help Cagg adapt to its intracellular habitat, coordinating its proliferation with the physiological state of the AMF host. |