Blog Posts - DEROME LABORATORY

New Paper in Molecular Ecology

7/23/2019

in collaboration with A. Luis Val and colleagues (INPA, Brazil), a new article from our our research group was published in Molecular Ecology. It discusses the composition patterns of fish-associated microbiota along the unique hydrochemical gradient of the Metting of Two Waters in the Amazon river.

Amazon fish bacterial communities show structural convergence along widespread hydrochemical gradients
François-Étienne Sylvain, Aleicia Holland, Émie Audet‐Gilbert, Adalberto Luis Val and Nicolas Derome
Mol Ecol (Epub ahead of print). https://doi.org/10.1111/mec.15184

NEW PhD Research Opportunities @ Derome Lab

6/21/2019

-- THESE OFFERS ARE NOW CLOSED. Sorry! --

New Book: Microbial Communities in Aquaculture Ecosystems

6/14/2019

A new collaborative textbook, edited by Nicolas Derome, has now been published in Springer Nature:

Microbial Communities in Aquaculture Ecosystems: Improving productivity and sustainability

It overviews state-of-the-art knowledge on free-living and host-associated microbiota and their importance on both fish health and the long-term sustainability of fish farming.
It also addresses high throughput techniques to monitor those host-microbiota interactions. Applications that resulted from microbiota monitoring studies (e.g. improve water quality, prevent opportunistic infections and improving fish performance) are also discussed.

New PhD Position - Black Soldier Fly Microbiomics

2/8/2019

Goal: Developing an instant, high throughput and integrative insect larvae model to decipher the interplay of factors controlling host-microbiota interactions for biotransforming waste biomass into high value biochemicals.

Skills: Background in molecular biology and bioinformatics, excellent communication and teamwork skills. Salary: CAD $21,000 per year, for 3 years.

[ THIS OFFER IS NOW CLOSED. ]

New Publication

8/7/2018

A brief history of bioinformatics
Jeff Gauthier, Antony T. Vincent, Steve J Charette and Nicolas Derome

Briefings in Bioinformatics | https://doi.org/10.1093/bib/bby063

To access the article, click here.
(for personal use only, do not redistribute this link)

Here we present an integrative timeline of key events in bioinformatics and related fields during the past half-century, as well as some background on parallel advances in molecular biology and computer science, and some reflections on the future of bioinformatics.

Team Highlights - Sentinel North Scholarship

5/14/2018

Congratulations to Amine Chaabane, who was awarded a Sentinel North scholarship for international graduate students.

Through this program, Sentinel North seeks to attract new talent, foster the development of young international scientists able to tackle and help resolve complex northern issues, and encourage the sharing of knowledge and experience across borders.

Amine's project aims to study two populations of Arctic char (Salvelinus alpinus) from the North region of Canada and trying to observe the impact of climate change and physiological parameters differences on this microbiota.
For more information about the Sentinel North international scholarship program, click here.

New Publication

5/12/2018

Deleterious interaction between honeybees (Apis mellifera) and its microsporidian intracellular parasite Nosema ceranae was mitigated by administrating either endogenous or allochthonous gut microbiota strains.

Sarah El Khoury, Nicolas Derome, Pierre Giovenazzo, Andrée Rousseau, Alexandre Lecoeur, Pierre-Luc Mercier, Bachar Cheaib, Sidki Bouslama, Vanessa Demey and Mathieu Castex

Frontiers in Ecology and Evolution | doi: 10.3389/fevo.2018.00058
(Full-text will be available on Frontiers soon)

ABSTRACT: Honey bees (Apis mellifera) are facing multiple stressors affecting their lifespan, health and productivity. Among them, Nosema ceranae is an intracellular microsporidian parasite, which plays a major impact on honey bees colonies. However, both efficiency and innocuity of current treatment against N. ceranae are observed, thus raising the urgent need to develop alternative prophylactic and curative strategies. Endogenous microbial...

New Publication in Frontiers

5/9/2018

Source: USGS // Public Domain.

Taxon-Function Decoupling as an Adaptive Signature of Lake Microbial Metacommunities Under a Chronic Polymetallic Pollution Gradient
Bachar Cheaib, Malo Le Boulch, Pierre-Luc Mercier et Nicolas Derome
Frontiers in Microbiology // 03 May 2018

Abstract: Adaptation of microbial communities to anthropogenic stressors can lead to reductions in microbial diversity and disequilibrium of ecosystem services. Such adaptation can change the molecular signatures of communities with differences in taxonomic and functional composition. Understanding the relationship between taxonomic and functional variation remains a critical issue in microbial ecology. Here, we assessed the taxonomic and functional diversity of a lake metacommunity system along a polymetallic pollution gradient caused by 60 years of chronic exposure to acid mine drainage (AMD). Our results highlight three adaptive signatures. First, a signature of taxon—function decoupling was detected in the microbial communities of moderately and highly polluted lakes. Second, parallel shifts in taxonomic composition occurred between polluted and unpolluted lakes. Third, variation in the abundance of functional modules suggested a gradual deterioration of ecosystem services (i.e., photosynthesis) and secondary metabolism in highly polluted lakes. Overall, changes in the abundance of taxa, function, and more importantly the polymetallic resistance genes such as copA, copB, czcA, cadR, cCusA, were correlated with trace metal content (mainly Cadmium) and acidity. Our findings highlight the impact of polymetallic pollution gradient at the lowest trophic levels.

New Publication in Front. Microbiol.

12/20/2017

Image: Northwest Fisheries Science Center

Strong Genomic and Phenotypic Heterogeneity in the Aeromonas sobria Species Complex
Jeff Gauthier, Antony T. Vincent, Steve J. Charette and Nicolas Derome
Front. Microbiol., 08 December 2017

Aeromonas sobria is a mesophilic motile aeromonad for which, despite increasing evidence of mutualistic interactions in salmonid fish, the determinants of its host-microbe associations remain poorly understood. The ongoing confusion between A. sobria (sensu stricto) and A. veronii bv. sobria further increases this knowledge gap.

In this new publication, we assessed the genomic and phenotypic heterogeneity among five A. sobria strains. Two clinical isolates recovered from infected fish (JF2635 and CECT 4245), one from an infected amphibian (08005) and two recently isolated brook charr probionts (TM12 and TM18) which inhibit in vitro growth of A. salmonicida subsp. salmonicida (a salmonid fish pathogen).

[To read the article click here]

New Publication in Frontiers

7/18/2017

Image: NOAA // CC BY-SA

Walleye Autochthonous Bacteria as Promising Probiotic Candidates against Flavobacterium columnare
Hamza Seghouani, Carlos Enrique Garcia Rangel, Jérémie Füller, Jeff Gauthier and Nicolas Derome
Frontiers in Microbiology / Aquatic Microbiology, 18 July 2017

In this publication, we report two novel Pseudomonas fluorescens strains isolated from the walleye gut microbiota. Those two strains improved by 54% the survival of walleye juveniles infected by Flavobacterium columnare, a major opportunistic pathogen of walleye and salmonid fish.

(To view this article, click on the title above.)