Publications by authors named "Abdelkader Behdenna"

Background: Variability in datasets is not only the product of biological processes: they are also the product of technical biases. ComBat and ComBat-Seq are among the most widely used tools for correcting those technical biases, called batch effects, in, respectively, microarray and RNA-Seq expression data.

Results: In this technical note, we present a new Python implementation of ComBat and ComBat-Seq.

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  • Dietary studies in birds of prey, especially vultures, require direct observation and analyzing food remains, which can be time-consuming and biased; this study instead utilized stable isotopes to estimate diet composition more efficiently.
  • Researchers hypothesized that vulture diet varies with location and that they primarily forage on grazing ungulates between Serengeti National Park and Selous Game Reserve; results confirmed a diet mostly consisting of herbivores, particularly grazers.
  • The study emphasized the importance of repeated sampling and advanced modeling techniques for accurate dietary assessments, while also indicating limited vulture movement between the sites; further research is needed to better understand these findings and their implications for vulture ecology and conservation.
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  • An evolutionary process involves changes in traits over time, but a deeper understanding of evolution can emerge from studying correlated evolution—when multiple evolutionary processes influence each other.
  • The authors propose a minimal likelihood framework that models the joint evolution of two traits using fewer parameters, making it more efficient than previous methods which required extensive computing.
  • This framework can assess independence between evolutionary processes, identify their interactions, and estimate the most likely model, and it's demonstrated to work effectively even with less than 100 species using data from $\gamma$-enterobacteria.
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  • * A retrospective study in France from 2014 to 2017 reviewed 760 febrile neutropenia cases, identifying 310 documented BSIs with low prevalence of MDR bacteria (only 2.9%) and no deaths related to these infections.
  • * The findings suggest that a 48-hour step-down approach to antibiotic therapy is effective, supported by parental and nursing efforts to minimize infection risks and reduce instances of staphylococcal infections.
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Serology is a core component of the surveillance and management of viral zoonoses. Virus neutralization tests are a gold standard serological diagnostic, but requirements for large volumes of serum and high biosafety containment can limit widespread use. Here, focusing on Rabies lyssavirus, a globally important zoonosis, we developed a pseudotype micro-neutralization rapid fluorescent focus inhibition test (pmRFFIT) that overcomes these limitations.

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Understanding multi-host pathogen maintenance and transmission dynamics is critical for disease control. However, transmission dynamics remain enigmatic largely because they are difficult to observe directly, particularly in wildlife. Here, we investigate the transmission dynamics of canine parvovirus (CPV) using state-space modelling of 20 years of CPV serology data from domestic dogs and African lions in the Serengeti ecosystem.

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The host innate immune response mediated by type I interferon (IFN) and the resulting up-regulation of hundreds of interferon-stimulated genes (ISGs) provide an immediate barrier to virus infection. Studies of the type I 'interferome' have mainly been carried out at a single species level, often lacking the power necessary to understand key evolutionary features of this pathway. Here, using a single experimental platform, we determined the properties of the interferomes of multiple vertebrate species and developed a webserver to mine the dataset.

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Evolutionary events co-occurring along phylogenetic trees usually point to complex adaptive phenomena, sometimes implicating epistasis. While a number of methods have been developed to account for co-occurrence of events on the same internal or external branch of an evolutionary tree, there is a need to account for the larger diversity of possible relative positions of events in a tree. Here we propose a method to quantify to what extent two or more evolutionary events are associated on a phylogenetic tree.

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Microsatellites are widely used in population genetics to uncover recent evolutionary events. They are typically genotyped using capillary sequencer, which capacity is usually limited to 9, at most 12 loci for each run, and which analysis is a tedious task that is performed by hand. With the rise of next-generation sequencing (NGS), a much larger number of loci and individuals are available from sequencing: for example, on a single run of a GS Junior, 28 loci from 96 individuals are sequenced with a 30X cover.

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