Overview
During my PhD, I worked on the impact of biochemical activities of a bacterial genotoxin (Cytolethal Distending Toxin, CDT) on its toxicity. I joined Dr Van Houte's lab to work on CRISPR/anti-CRISPR interactions.
Qualifications
2019: PhD - Biochemistry - "Study of the activity of Cytolethal Distending Toxin and damages induced during mitosis" (Université de Toulouse, France/Toxalim Research Center in Food Toxicology, France)
2016: Biochemical Engineering Degree (INSA Toulouse, France)
Links
Research group links
Publications
Key publications | Publications by category | Publications by year
Publications by category
Journal articles
Pons BJ, Westra ER, van Houte S (2023). Determination of Acr-mediated immunosuppression in Pseudomonas aeruginosa.
MethodsX,
10Abstract:
Determination of Acr-mediated immunosuppression in Pseudomonas aeruginosa.
Bacteria have a broad array of defence mechanisms to fight bacteria-specific viruses (bacteriophages, phages) and other invading mobile genetic elements. Among those mechanisms, the 'CRISPR-Cas' (Clustered Regularly Interspaced Short Palindromic Repeats - CRISPR-associated) system keeps record of previous infections to prevent re-infection and thus provides acquired immunity. However, phages are not defenceless against CRISPR-based bacterial immunity. Indeed, they can escape CRISPR systems by encoding one or several anti-CRISPR (Acr) proteins. Acr proteins are among the earliest proteins produced upon phage infection, as they need to quickly inhibit CRISPR-Cas system before it can destroy phage genetic material. As a result, Acrs do not perfectly protect phage from the CRISPR-Cas system, and infection often fails. However, even if the infection fails, Acr can induce a lasting inactivation of the CRISPR-Cas system. The method presented here aims to assess the lasting CRISPR-Cas inhibition in Pseudomonas aeruginosa induced by Acr proteins by:•Infecting the P. aeruginosa strain with a phage carrying an acr gene.•Making the cell electrocompetent while eliminating the phage•Transforming the cells with a plasmid targeted by the CRISPR-Cas system and a non-targeted one to measure the relative transformation efficiency of the plasmids. This method can be adapted to measure which parameters influence Acr-induced immunosuppression in different culture conditions.
Abstract.
Author URL.
He Z, Gharaibeh RZ, Newsome RC, Pope JL, Dougherty MW, Tomkovich S, Pons B, Mirey G, Vignard J, Hendrixson DR, et al (2018). Campylobacter jejuni promotes colorectal tumorigenesis through the action of cytolethal distending toxin. Gut, 68(2).
Publications by year
In Press
Pons BJ, Dimitriu T, Westra ER, van Houte S (In Press). Antibiotics that affect translation can antagonize phage infectivity by interfering with the deployment of counter-defences.
Abstract:
Antibiotics that affect translation can antagonize phage infectivity by interfering with the deployment of counter-defences
AbstractIt is becoming increasingly clear that antibiotics can both positively and negatively impact the infectivity of bacteriophages (phage), but the underlying mechanisms often remain unclear. Here we demonstrate that antibiotics that target the protein translation machinery can fundamentally alter the outcome of bacteria-phage interactions by interfering with the production of phage-encoded counter-defence proteins. Specifically, using Pseudomonas aeruginosa PA14 and phage DMS3vir as a model, we show that bacteria with CRISPR-Cas immune systems have elevated levels of immunity against phage that encode anti-CRISPR (acr) genes when translation inhibitors are present in the environment. CRISPR-Cas are highly prevalent defence systems that enable bacteria to detect and destroy phage genomes in a sequence-specific manner. In response, many phages encode acr genes that are expressed immediately following infection to inhibit key steps of the CRISPR-Cas immune response. Our data show that while phage carrying acr genes can amplify efficiently on bacteria with CRISPR-Cas immune systems in the absence of antibiotics, the presence of antibiotics that act on protein translation prevents phage amplification, while protecting bacteria from lysis. These results help to understand how antibiotics-phage synergy and antagonism depend on the molecular interactions that define phage infectivity and host immunity.
Abstract.
2023
Pons BJ, Westra ER, van Houte S (2023). Determination of Acr-mediated immunosuppression in Pseudomonas aeruginosa.
MethodsX,
10Abstract:
Determination of Acr-mediated immunosuppression in Pseudomonas aeruginosa.
Bacteria have a broad array of defence mechanisms to fight bacteria-specific viruses (bacteriophages, phages) and other invading mobile genetic elements. Among those mechanisms, the 'CRISPR-Cas' (Clustered Regularly Interspaced Short Palindromic Repeats - CRISPR-associated) system keeps record of previous infections to prevent re-infection and thus provides acquired immunity. However, phages are not defenceless against CRISPR-based bacterial immunity. Indeed, they can escape CRISPR systems by encoding one or several anti-CRISPR (Acr) proteins. Acr proteins are among the earliest proteins produced upon phage infection, as they need to quickly inhibit CRISPR-Cas system before it can destroy phage genetic material. As a result, Acrs do not perfectly protect phage from the CRISPR-Cas system, and infection often fails. However, even if the infection fails, Acr can induce a lasting inactivation of the CRISPR-Cas system. The method presented here aims to assess the lasting CRISPR-Cas inhibition in Pseudomonas aeruginosa induced by Acr proteins by:•Infecting the P. aeruginosa strain with a phage carrying an acr gene.•Making the cell electrocompetent while eliminating the phage•Transforming the cells with a plasmid targeted by the CRISPR-Cas system and a non-targeted one to measure the relative transformation efficiency of the plasmids. This method can be adapted to measure which parameters influence Acr-induced immunosuppression in different culture conditions.
Abstract.
Author URL.
2018
He Z, Gharaibeh RZ, Newsome RC, Pope JL, Dougherty MW, Tomkovich S, Pons B, Mirey G, Vignard J, Hendrixson DR, et al (2018). Campylobacter jejuni promotes colorectal tumorigenesis through the action of cytolethal distending toxin. Gut, 68(2).
Benoit_Pons Details from cache as at 2023-02-06 02:06:16
Refresh publications
