• AMR-Diag: Neural network based genotype-to-phenotype prediction of resistance towards β-lactams in Escherichia coli and Klebsiella pneumoniae 

      Avershina, Ekaterina; Sharma, Priyanka; Taxt, Arne Michael; Singh, Harpreet; Frye, Stephan Alfons; Paul, Kolin; Kapil, Arti; Naseer, Mohammed Umaer; Kaur, Punit; Ahmad, Rafi (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-03-29)
      Antibiotic resistance poses a major threat to public health. More effective ways of the antibiotic prescription are needed to delay the spread of antibiotic resistance. Employment of sequencing technologies coupled with the use of trained neural network algorithms for genotype-to-phenotype prediction will reduce the time needed for antibiotic susceptibility profile identification from days to ...
    • Chronic obstructive pulmonary disease does not impair responses to resistance training 

      Mølmen, Knut Sindre; Hammarström, Jens Konrad Daniel; Falch, Gunnar Slettaløkken; Grundtvig, Morten; Koll, Lise; Hanestadhaugen, Marita; Khan, Yusuf; Ahmad, Rafi; Malerbakken, Bente; Rødølen, Tore Jørgen; Lien, Roger; Rønnestad, Bent; Raastad, Truls; Ellefsen, Stian (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-07-06)
      <i>Background</i> - Subjects with chronic obstructive pulmonary disease (COPD) are prone to accelerated decay of muscle strength and mass with advancing age. This is believed to be driven by disease-inherent systemic pathophysiologies, which are also assumed to drive muscle cells into a state of anabolic resistance, leading to impaired abilities to adapt to resistance exercise training. Currently, ...
    • Clinical Diagnostics of Bacterial Infections and Their Resistance to Antibiotics—Current State and Whole Genome Sequencing Implementation Perspectives 

      Avershina, Ekaterina; Khezri, Abdolrahman; Ahmad, Rafi (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-04-19)
      Antimicrobial resistance (AMR), defined as the ability of microorganisms to withstand antimicrobial treatment, is responsible for millions of deaths annually. The rapid spread of AMR across continents warrants systematic changes in healthcare routines and protocols. One of the fundamental issues with AMR spread is the lack of rapid diagnostic tools for pathogen identification and AMR detection. ...
    • A culture-, amplification-independent, and rapid method for identification of pathogens and antibiotic resistance profile in bovine mastitis milk 

      Ahmadi, Asal; Khezri, Abdolrahman; Nørstebø, Håvard; Ahmad, Rafi (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-01-06)
      Introduction: Rapid and accurate diagnosis of causative pathogens in mastitis would minimize the imprudent use of antibiotics and, therefore, reduce the spread of antimicrobial resistance. Whole genome sequencing offers a unique opportunity to study the microbial community and antimicrobial resistance (AMR) in mastitis. However, the complexity of milk samples and the presence of a high amount ...
    • Distribution of siderophore gene systems on a Vibrionaceae phylogeny: Database searches, phylogenetic analyses and evolutionary perspectives 

      Thode, Sunniva Katharina; Rojek, Ewelina; Kozlowski, Mikolaj; Ahmad, Rafi; Haugen, Peik (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-02-14)
      Siderophores are small molecules synthesized and secreted by bacteria and fungi to scavenge iron. Extracellular ferri-siderohores are recognized by cognate receptors on the cell surface for transport over membranes. Several siderophore systems from <i>Vibrionaceae</i> representatives are known and well understood, e.g., the molecular structure of the siderophore, the biosynthesis gene cluster ...
    • DNA methylation patterns vary in boar sperm cells with different levels of DNA fragmentation 

      Khezri, Abdolrahman; Narud, Birgitte; Stenseth, Else-Berit; Johannisson, Anders; Myromslien, Frøydis Deinboll; Gaustad, Ann Helen; Wilson, Robert C.; Lyle, Robert; Morrell, Jane M.; Kommisrud, Elisabeth; Ahmad, Rafi (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-11-27)
      <i>Background</i> - Sperm DNA integrity is considered essential for successful transmission of the paternal genome, fertilization and normal embryo development. DNA fragmentation index (DFI, %) has become a key parameter in the swine artificial insemination industry to assess sperm DNA integrity. Recently, in some elite Norwegian Landrace boars (boars with excellent field fertility records), a higher ...
    • Expression profiling reveals Spot 42 small RNA as a key regulator in the central metabolism of Aliivibrio salmonicida 

      Hansen, Geir Åsmund; Ahmad, Rafi; Hjerde, erik; Fenton, Christopher Graham; Willassen, Nils Peder; Haugen, Peik (Journal article; Tidsskriftartikkel; Peer reviewed, 2012)
      Spot 42 was discovered in Escherichia coli nearly 40 years ago as an abundant, small and unstable RNA. Its biological role has remained obscure until recently, and is today implicated in having broader roles in the central and secondary metabolism. Spot 42 is encoded by the spf gene. The gene is ubiquitous in the Vibrionaceae family of gamma-proteobacteria. One member of this family, Aliivibrio ...
    • Highly sensitive quantitative phase microscopy and deep learning aided with whole genome sequencing for rapid detection of infection and antimicrobial resistance 

      Ahmad, Azeem; Hettiarachchi, Ramith; Khezri, Abdolrahman; Ahluwalia, Balpreet Singh; Wadduwage, Dushan; Ahmad, Rafi (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-04-12)
      Current state-of-the-art infection and antimicrobial resistance (AMR) diagnostics are based on culture-based methods with a detection time of 48–96 h. Therefore, it is essential to develop novel methods that can do real-time diagnoses. Here, we demonstrate that the complimentary use of label-free optical assay with whole-genome sequencing (WGS) can enable rapid diagnosis of infection and AMR. Our ...
    • Hybrid Assembly Provides Improved Resolution of Plasmids, Antimicrobial Resistance Genes, and Virulence Factors in Escherichia coli and Klebsiella pneumoniae Clinical Isolates 

      Khezri, Abdolrahman; Avershina, Ekaterina; Ahmad, Rafi (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-12-10)
      Emerging new sequencing technologies have provided researchers with a unique opportunity to study factors related to microbial pathogenicity, such as antimicrobial resistance (AMR) genes and virulence factors. However, the use of whole-genome sequence (WGS) data requires good knowledge of the bioinformatics involved, as well as the necessary techniques. In this study, a total of nine Escherichia ...
    • Increased biological relevance of transcriptome analyses in human skeletal muscle using a model-specific pipeline 

      Khan, Yusuf; Hammarström, Jens Konrad Daniel; Rønnestad, Bent; Ellefsen, Stian; Ahmad, Rafi (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-11-30)
      <i>Background</i> - Human skeletal muscle responds to weight-bearing exercise with significant inter-individual differences. Investigation of transcriptome responses could improve our understanding of this variation. However, this requires bioinformatic pipelines to be established and evaluated in study-specific contexts. Skeletal muscle subjected to mechanical stress, such as through resistance ...
    • Increased growth temperature and vitamin B12 supplementation reduces the lag time for rapid pathogen identification in BHI agar and blood cultures 

      Ali, Jawad; Joshi, Mukund; Ahmadi, Asal; Strætkvern, Knut Olav; Ahmad, Rafi (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-02-03)
      Background: The rapid diagnostics of pathogens is essential to prescribe appropriate and early antibiotic therapy. The current methods for pathogen detection require the bacteria to grow in a culture medium, which is time-consuming. This increases the mortality rate and the global burden of antimicrobial resistance. Culture-free detection methods are still under development and are not used in the ...
    • Normalization of gene expression data revisited: the three viewpoints of the transcriptome in human skeletal muscle undergoing load-induced hypertrophy and why they matter 

      Khan, Yusuf; Hammarström, Daniel; Ellefsen, Stian; Ahmad, Rafi (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-06-18)
      Background - The biological relevance and accuracy of gene expression data depend on the adequacy of data normalization. This is both due to its role in resolving and accounting for technical variation and errors, and its defining role in shaping the viewpoint of biological interpretations. Still, the choice of the normalization method is often not explicitly motivated although this choice may be ...
    • Plasmid Identification and Plasmid-Mediated Antimicrobial Gene Detection in Norwegian Isolates 

      Khezri, Abdolrahman; Avershina, Ekaterina; Ahmad, Rafi (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-12-27)
      Norway is known for being one of the countries with the lowest levels of antimicrobial resistance (AMR). AMR, through acquired genes located on transposons or conjugative plasmids, is the horizontal transmission of genes required for a given bacteria to withstand antibiotics. In this work, bioinformatic analysis of whole-genome sequences and hybrid assembled data from Escherichia coli, and Klebsiella ...
    • Rapid identification of pathogens, antibiotic resistance genes and plasmids in blood cultures by nanopore sequencing 

      Taxt, Arne Michael; Avershina, Ekaterina; Frye, Stephan Alfons; Naseer, Mohammed Umaer; Ahmad, Rafi (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-05-06)
      Bloodstream infections (BSI) and sepsis are major causes of morbidity and mortality worldwide. Blood culture-based diagnostics usually requires 1–2 days for identification of bacterial agent and an additional 2–3 days for phenotypic determination of antibiotic susceptibility pattern. With the escalating burden of antimicrobial resistance (AMR) rapid diagnostics becomes increasingly important to ...
    • Vitamin D3 supplementation does not enhance the effects of resistance training in older adults 

      Mølmen, Knut Sindre; Hammarström, Jens Konrad Daniel; Pedersen, Karianne; Lie, Anne Cecilie Lian; Steile, Ragnvald B.; Nygård, Håvard; Khan, Yusuf; Hamarsland, Håvard; Koll, Lise; Hanestadhaugen, Marita; Eriksen, Atle Lie; Grindaker, Eirik; Whist, Jon Elling; Buck, Daniel; Ahmad, Rafi; Strand, Tor Arne; Rønnestad, Bent R.; Ellefsen, Stian (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-03-31)
      Background: Lifestyle therapy with resistance training is a potent measure to counteract age-related loss in muscle strength and mass. Unfortunately, many individuals fail to respond in the expected manner. This phenomenon is particularly common among older adults and those with chronic diseases (e.g. chronic obstructive pulmonary disease, COPD) and may involve endocrine variables such as vitamin ...