We haven’t been travelling much this year, but our collaborators have been busy!

Dearborn, D.C., A.B. Gager, A.G. McArthur, M.E. Gilmour, E. Mandzhukova, R.A. Mauck. 2017. How to get diverse MHC genotypes without disassortative mating. Presentation at the 2017 Annual Meeting of the Society for Integrative and Comparative Biology, New Orleans, Louisiana.

McLean, M., D. Theriault, M. Kelley, B.A. Lago, A.G. McArthur, & L. Williams. 2017. Role of Nfe2 and pro-oxidant exposure in inner ear development in zebrafish. Presentation at the Society of Toxicology 56rd Annual Meeting, Baltimore, Maryland.

Williams, L.M., B.A. Lago, A.G. McArthur, A.R. Raphenya, N. Pray, N. Saleem, S. Salas, K. Paulson, R.S. Mangar, Y. Liu, A.H. Vo, & J.A. Shavit. 2017. The transcription factor, Nuclear factor, erythroid 2 (Nfe2), is a regulator of the oxidative stress response during Danio rerio development. Presentation at the Society of Toxicology 56rd Annual Meeting, Baltimore, Maryland.

Winsor, G.L., C. Bertelli, K.K. Tsang, B. Alcock, A.G. McArthur, & F.S.L. Brinkman. 2017. Pseudomonas Genome Database 2017: Improved gene/AMR/VF/genomic island annotations, comparative genome analyses, and a platform for facilitating public health genomic epidemiology. Presentation at the 16th International Conference on Pseudomonas, Liverpool, United Kingdom.

 

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briony lagoThis month we say farewell to Briony Lago as she returns to her undergraduate studies in Chemical Biology at McMaster. Briony joined us as part of her Chemical Biology Co-Op program and worked on both human muscle atrophy and zebrafish toxicology transcriptome studies, as well a curation of the Comprehensive Antibiotic Resistance Database. Her publications are below, with more on the way. Briony was also awarded a 2016 IIDR Summer Student Fellowship for her work. Good luck Briony!

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Three of our undergraduate students gave poster presentations in the last month. Arjun Sharma (Biochemistry & Biomedical Sciences 3rd year) outlined his work on developing the Comprehensive Antibiotic Resistance Database’s (arpcard.mcmaster.ca) CARD*Shark text mining algorithms at the Michael G. DeGroote Institute for Infectious Disease Research (IIDR) Trainee Day while Kirill Pankov (Biomedical Discovery & Commercialization 4th year) presented the results of his summer NSERC Undergraduate Student Research Award (USRA) research in the Laboratory of Dr. Joanna Wilson into the origin of Cnidarian P450 enzymes, work he is continuing in our lab as part of his thesis research. Mohammad Khan (Biomedical Discovery & Commercialization 4th year), a thesis student in the Laboratory of Dr. Eric Brown that collaborates with our group, also presented a poster at IIDR Trainee Day on his work on chemical-genetic interaction database design.

Sharma, A.N., S. Doshi, A.R. Raphenya, B. Alcock, B.M. Dave, B.A. Lago, K.K. Tsang, & A.G. McArthur. 2016. CARDShark: Computer-assisted biocuration of the Comprehensive Antibiotic Resistance Database. Poster presentation at the 2016 Michael G. DeGroote Institute for Infectious Disease Research (IIDR) Trainee Day, Hamilton, Ontario, Canada.

Pankov, K., A.G. McArthur & J.Y. Wilson. 2016. The Cytochrome P450 (CYP) superfamily in the Cnidarian phylum. Poster presentation at the 2016 Undergraduate Student Research Awards (USRA) Poster Session, Hamilton, Ontario, Canada.

Khan, M.A., S. French, B. Aubie, A.G McArthur & E.D. Brown. 2016. Challenging common screening filters through analysis of a chemical-genetic screening database. Poster presentation at the 2016 Michael G. DeGroote Institute for Infectious Disease Research (IIDR) Trainee Day, Hamilton, Ontario, Canada.

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s0166445xWilliams LM, Lago BA, McArthur AG, Raphenya AR, Pray N, Saleem N, Salas S, Paulson K, Mangar RS, Liu Y, Vo AH, Shavit JA.

Aquat Toxicol. 2016 Oct 1;180:141-154.

Development is a complex and well-defined process characterized by rapid cell proliferation and apoptosis. At this stage in life, a developmentally young organism is more sensitive to toxicants as compared to an adult. In response to pro-oxidant exposure, members of the Cap’n’Collar (CNC) basic leucine zipper (b-ZIP) transcription factor family (including Nfe2 and Nfe2-related factors, Nrfs) activate the expression of genes whose protein products contribute to reduced toxicity. Here, we studied the role of the CNC protein, Nfe2, in the developmental response to pro-oxidant exposure in the zebrafish (Danio rerio). Following acute waterborne exposures to diquat or tert-buytlhydroperoxide (tBOOH) at one of three developmental stages, wildtype (WT) and nfe2 knockout (KO) embryos and larvae were morphologically scored and their transcriptomes sequenced. Early in development, KO animals suffered from hypochromia that was made more severe through exposure to pro-oxidants; this phenotype in the KO may be linked to decreased expression of alas2, a gene involved in heme synthesis. WT and KO eleutheroembryos and larvae were phenotypically equally affected by exposure to pro-oxidants, where tBOOH caused more pronounced phenotypes as compared to diquat. Comparing diquat and tBOOH exposed embryos relative to the WT untreated control, a greater number of genes were up-regulated in the tBOOH condition as compared to diquat (tBOOH: 304 vs diquat: 148), including those commonly found to be differentially regulated in the vertebrate oxidative stress response (OSR) (e.g. hsp70.2, txn1, and gsr). When comparing WT and KO across all treatments and times, there were 1170 genes that were differentially expressed, of which 33 are known targets of the Nrf proteins Nrf1 and Nrf2. More specifically, in animals exposed to pro-oxidants a total of 968 genes were differentially expressed between WT and KO across developmental time, representing pathways involved in coagulation, embryonic organ development, body fluid level regulation, erythrocyte differentiation, and oxidation-reduction, amongst others. The greatest number of genes that changed in expression between WT and KO occurred in animals exposed to diquat at 2h post fertilization (hpf). Across time and treatment, there were six genes (dhx40, cfap70, dnajb9b, slc35f4, spi-c, and gpr19) that were significantly up-regulated in KO compared to WT and four genes (fhad1, cyp4v7, nlrp12, and slc16a6a) that were significantly down-regulated. None of these genes have been previously identified as targets of Nfe2 or the Nrf family. These results demonstrate that the zebrafish Nfe2 may be a regulator of both primitive erythropoiesis and the OSR during development.

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Kara Tsang krishna

Kara Tsang (graduate, McMaster BDC) – Kara did her BiomedDC 4A15 thesis in the lab, focused on Pseudomonas resistome prediction and cystic fibrosis-associated metagenomic sequencing and starts September 2016 as MSc student in the area of clinical AMR analytics, particularly metagenomics. Her work will be part of our recently funded Genome Canada grants, as well as part of McMaster’s clinical genome sequencing efforts.

Krishna Srinivasan (graduate, McMaster Biology) – Krishna just finished his undergraduate degree in McMaster’s Biology department, with a thesis in environmental toxicology. He starts as a MSc student September 2016, collaborating with the Jenny lab (UAlabama) on our recently funded NIH grant examining the role of MTF-1 in lens development and cataractogenesis.

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cihr logoUnknown-1

CIHR (G. Steinberg, McMaster University, Canada) Gene Environment Team on Brown/beige Adipose Tissue (GET_BAT). In this project we will conduct studies in cells, mice and humans to examine how agricultural and food processing practices may regulate brown adipose tissue metabolic activity directly or indirectly by altering the billions of bacteria that reside within our gastrointestinal tract.

NIH/NIEHS (M. Jenny, University of Alabama, USA) The role of MTF-1 as a mediator of ocular toxicity. The major goals of this project are to characterize the role of MTF-1 in regulating genes involved in eye development.

NIH/NIEHS (A. Timme-Laragy, University of Massachusetts Amherst) Activation of Nrf2 during embryonic development: mechanisms and consequences. Examining the possible regulatory role of Nrf2 in early embryonic development, with emphasis upon molecular responses to oxidative stress.

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briony lagoBriony Lago has joined the lab as part of her McMaster Chemical Biology Co-Op program. She will be working on our ‘Omic’ Responses & Inactivity in Aging project (a collaboration with colleagues in Kinesiology & Chemistry, see here) as well as our collaboration with Bates College on the role of Nfe2 in the oxidative stress response during zebrafish development (see here).

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Larissa-williams-2012-300x200A new NIH-funded collaboration with Dr. Larissa Williams, Bates College, USA that applies transcriptomic approaches to examination of the role Nfe2 in oxidative stress response during development of the model species Danio rerio (zebrafish).

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INN_CFI_ENB_2C_RGBThe McArthurLab receives funding from the Canadian Foundation for Innovation: Twelve McMaster research projects receive more than $2.4-million

 

 

fwiDr. McArthur to be a @McMasterU Learning Portfolio Fellow! Continuing the collaboration with @TweetDrD & @McMaster_MIIETL: Meet the 2015/2016 Learning Portfolio Fellows

 

 

blue301logoDr. McArthur will be spending August 2015 at the Woods Hole Oceanographic Institution as a Guest Investigator of Dr. Mark Hahn, continuing a long standing collaboration in ecotoxicogenomics.

 

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