Identification and gene expression of multiple peptidoglycan recognition proteins (PGRPs) in the deep-sea mussel Bathymodiolus azoricus, involvement in symbiosis?
2017
The relationship between the
deep-seamussel
Bathymodiolusazoricus and its thiotrophic (
SOX) and
methanotrophic(MOX) symbionts has been ecologically and functionally well studied.
Endosymbiosisis common in
deep-sea
hydrothermal ventfauna, yet little is known about the molecular mechanisms underlying the regulation of interactions between host and symbionts. In this study we focused on a group of
pattern recognition receptors(PRR), called PGRPs that are able to recognize the
peptidoglycanof bacterial cell wall. We first characterised the different PGRPs isoforms in B. azoricus
gillsand identified five paralogs. Among them two displayed a
signal peptide. Then, specific probes designed for each paralog were used to perform real-time PCR quantification in
gillsof individuals showing various bacterial content as a result of in situ experimental procedures. Overall we found a decrease of PGRPs expression when symbionts amount decreases, suggesting an implication of PGRPs in the regulation of symbionts in B. azoricus
gills. We therefore hypothesize that secreted proteins could act as cooperation signals to induce colonisation of symbiotic tissue while non-secreted proteins may regulate the density of endosymbionts within the
gilltissue.
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