Biology subjects

Hoque, M. A.

Publications and source records attributed to Hoque, M. A..

6 recordsLinked to original sources

bioRxiv2023

Amplification of avian influenza viruses along poultry marketing chains in Bangladesh: a controlled field experiment

The prevalence of avian influenza viruses (AIVs) is commonly found to increase dramatically from farms to live bird markets (LBMs). Viral transmission dynamics along marketing chains is, however, poorly understood. To address this gap, we implemented a field experiment altering chicken supply to an LBM in Chattogram, Bangladesh. Chickens traded along altered (intervention) and conventional (control) marketing chains were tested for AIVs. Upon arrival at the LBM, the odds of detecting AIVs did not differ between control and intervention groups. However, 12 hours later, intervention group odds were lower, particularly for broiler chickens, indicating that viral shedding in LBM resulted partly from infections during transport and trade. Curtailing AIV prevalence in LBMs requires mitigating risk in marketing chain nodes preceding chickens delivery at LBMs. Article Summary LineThe high prevalence of avian influenza viruses in marketed chickens cannot be solely attributed to viral transmission within live bird markets but is also influenced by infections occurring prior to the chickens supply to these markets.

ecology↗

bioRxiv2023

EPINEST, an agent-based model to simulate epidemic dynamics in large-scale poultry production and distribution networks

The rapid intensification of poultry production raises important concerns about the associated risks of zoonotic infections. Here, we introduce EPINEST (EPI-demic NEtwork Simulation in poultry Transportation systems): an agent-based modelling designed to simulate pathogen transmission within realistic poultry production and distribution networks. The modular structure of the model allows for easy parameterization to suit specific countries and system configurations. Moreover, the framework enables the replication of a wide range of eco-epidemiological scenarios by incorporating diverse pathogen life-history traits, modes of transmission and interactions between multiple strains and/or pathogens. EPINEST was developed in the context of an interdisciplinary multicentre study conducted in Bangladesh, India, Vietnam and Sri Lanka, and will facilitate the investigation of the spreading patterns of various health hazards such as avian influenza, Campylobacter, Salmonella and antimicrobial resistance in these countries. Furthermore, this modelling framework holds potential for broader application in veterinary epidemiology and One Health research, extending its relevance beyond poultry to encompass other livestock species and disease systems.

bioinformatics↗

bioRxiv2022

Piezo1 mechanosensing regulates integrin-dependent chemotactic migration in human T cells

T cells are crucial for efficient antigen-specific immune responses and thus their migration within the body, to inflamed tissues from circulating blood or to secondary lymphoid organs, play a very critical role. T cell extravasation in inflamed tissues depends on chemotactic cues and interaction between endothelial adhesion molecules and cellular integrins. A migrating T cell is expected to sense diverse external and membrane-intrinsic mechano-physical cues, but molecular mechanisms of such mechanosensing in cell migration are not established. We explored if the professional mechanosensor Piezo1 play any role during integrin-dependent chemotaxis of human T cells. We found that deficiency of Piezo1 in human T cells interfered with integrin-dependent cellular motility on ICAM-1-coated surface. Piezo1 recruitment at the leading edge of moving T cells is dependent on and follows focal adhesion formation at the leading edge and local increase in membrane tension on chemokine receptor activation. Piezo1 recruitment and activation, followed by calcium influx and calpain activation, in turn are crucial for the integrin LFA-1 (CD11a/CD18) recruitment at the leading edge of the chemotactic human T cells. Thus, we find that Piezo1 activation in response to local mechanical cues constitutes a membrane-intrinsic component of the outside-in signaling in human T cells, migrating in response to chemokines, that mediates integrin recruitment to the leading edge.

immunology↗

bioRxiv2021

Australia as a global sink for the genetic diversity of avian influenza A virus

Most of our understanding of the ecology and evolution of avian influenza A virus (AIV) in wild birds is derived from studies conducted in the northern hemisphere on waterfowl, with a substantial bias towards dabbling ducks. However, relevant environmental conditions and patterns of avian migration and reproduction are substantially different in the southern hemisphere. Through the sequencing and analysis of 333 unique AIV genomes collected from wild birds collected over 15 years we show that Australia is a global sink for AIV diversity and not integrally linked with the Eurasian gene pool. Rather, AIV are infrequently introduced to Australia, followed by decades of isolated circulation and eventual extinction. The number of co-circulating viral lineages varies per subtype. AIV haemagglutinin (HA) subtypes that are rarely identified at duck-centric study sites (H8-12) had more detected introductions and contemporary co-circulating lineages in Australia. Combined with a lack of duck migration beyond the Australian-Papuan region, these findings suggest introductions by long-distance migratory shorebirds. In addition, we found no evidence of directional or consistent patterns in virus movement across the Australian continent. This feature corresponds to patterns of bird movement, whereby waterfowl have nomadic and erratic rainfall-dependant distributions rather than consistent intra-continental migratory routes. Finally, we detected high levels of virus gene segment reassortment, with a high diversity of AIV genome constellations across years and locations. These data, in addition to those from other studies in Africa and South America, clearly show that patterns of AIV dynamics in the Southern Hemisphere are distinct from those in the temperate north. Author SummaryA result of the ever-growing poultry industry is a dramatic global increase in the incidence of high pathogenicity avian influenza virus outbreaks. In contrast, wild birds are believed to be the main reservoir for low pathogenic avian influenza A virus. Due to intensive research and surveillance of AIV in waterfowl in the Northern Hemisphere, we have a better understanding of AIV ecology and evolution in that region compared to the Southern Hemisphere, which are characterised by different patterns of avian migration and ecological conditions. We analysed 333 unique AIV genomes collected from wild birds in Australia to understand how Australia fits into global AIV dynamics and how viruses are maintained and dispersed within the continent of Australia. We show that the Southern Hemisphere experiences differing evolutionary dynamics to those seen in Northern Hemisphere with Australia representing a global sink for AIV.

evolutionary biology↗

bioRxiv2019

Arbuscular mycorrhizal fungi, selenium, sulfur, silica-gel and biochar reduce arsenic uptake in plant biomass and improve nutritional quality in Pisum sativum

Arsenic (As) is a carcinogenic substance. It increased in crop grown in field soil from ground water irrigation. Subsequently As transport into the human body through food chains. The reduction of As transport in root, shoot and grain of pea genotypes is significantly important to protect human health. This research is focused on the biomass growth and alleviation of As accumulation in root, shoot and grain of pea genotypes in high As soil (30mgkg-1) amended with arbuscular mycorrhizal fungi (AMF), biochar (BC) of rice husk and saw dust, selenium (Se), silica- gel (Si), and sulfur (S). Shoot length, root, shoot and pod mass were generally higher in pea crops grown in soil amended with AMF, Se, Si- gel and S. Rice husk and saw dust BC less consistently increased some growth parameters, particularly in genotype BARI Motor 2. However, the BCs more often reduced growth and pod mass. All treatments significantly reduced As concentration in tissues; As in grains was reduced on average 60% by any of the soil amendments. AMF, Se and Si- gel all were found more effective than BC for the reduction of As uptake in pea crops. As in grains was reduced 77% by AMF, 71% by Se and 69% by Si- gel on average. As in root, shoot, and grain was also affected by variety; in control treatments, total As uptake in plants pot-1 of BARI Motor 1 and 3 was found 60 to 70% higher than BARI Motor 2. Comparing the variety and treatment with most As in grains (BARI Motor 1 control, 0.35 mg As kg-1) and least As in grains (BARI motor 1, 2 & 3 with AMF with 0.07 mg As kg-1), the choice of variety and soil amendment could reduce human intake of As through pea by 80%. It is recommended that choice of pea variety and soil amendment with AMF and Se have great potential for improving the nutritional quality of pea grown in As contaminated soil, as well as reducing As transfer to human bodies through food chains in pea crops.

microbiology↗

bioRxiv2019

Arbuscular Mycorrhizal Fungus (AMF) and reduction of arsenic uptake in lentil crops

Arsenic (As) is a carcinogenic and hazardous substance that poses a serious risk to human health. Physiological studies have shown that growth of lentil crop have been impaired due to arsenic toxicity, and is transportable into human food chains. Our research focused on the transportation of As in lentil crops and its mitigation using Arbuscular Mycorrhizal Fungus (AMF). Shoot length, fresh and dry weight of shoot and root were found comparatively higher in 5 and 15 mgkg-1 arsenic treated lentil seedlings than in a 100 mgkg-1 As concentrated soil. As accumulation in lentils pods of BARI Mashur 1 were found higher than others; but As uptake in root and shoot were increased significantly in all BARI released lentil genotypes. Biomass growth of lentil was found higher in AMF treated soils in compare to non-AMF. AMF effectively reduced the arsenic uptake in root and shoot at 8 and 45 mgkg-1 As concentrated soils compared. As free lentil seeds are significantly important for human consumption through mitigation of As accumulation in lentil roots shoots and pods. AMF shows great potential in providing As free lentil seeds throughout the world.

microbiology↗