ArticleFrontiers in immunology2026
Characterization and diversity of defense systems in
Article in Frontiers in immunology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Introduction: Methods: We present a comprehensive pan-genomic analysis of antiviral defense systems across 73 complete genomes (or chromosomes) of Results: We reveal a diverse and complex defense repertoire dominated by restriction-modification systems and CRISPR-Cas Class 1 Type I-F, with significant contributions from toxin-antitoxin, GAPS2, PsyrTA, and Mokosh systems. Notably, defense genes are non-randomly distributed, often clustering into genomic islands suggestive of horizontal acquisition. Expanded analysis confirms conservation of core defense profiles across assembly types, supporting the utility of lower-quality data when complete genomes are scarce. Comparative analysis uncovers species-specific differences, with Discussion: Our findings unveil a multi-layered, modular immune architecture in Providencia, providing crucial insights into its genome plasticity, phage resistance, and adaptation in clinical environments. This work establishes a foundation for understanding the role of defense systems in the evolution and pathogenicity of the
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