<i>Nocardia</i> genomes are a large reservoir of diverse gene content, biosynthetic gene clusters, and species-specific genes

Understanding the genomic diversity and biosynthetic potential of microorganisms is instrumental for addressing issues in microbial evolution, natural product discovery, and host-microbe interactions. <i>Nocardia</i>, a bacterial genus known for its opportunistic pathogenicity, represents an underexplored group of immense genomic diversity and biosynthetic capabilities. This study employed genome mining to reveal the open pangenome of <i>Nocardia</i> and identified an extensive repertoire of BGCs, including novel clusters with the potential to produce therapeutically significant compounds such as prodigiosin-related compounds. By integrating genome mining, phylogenetics, and synteny analysis, this study provides insights into how genomic plasticity, species-specific genes, and evolutionary changes such as gene gains and losses that contribute to <i>Nocardia</i>'s biosynthetic diversity and evolution. These findings contribute to advancing microbial genomics, evolution, and biotechnology by uncovering the potential of <i>Nocardia</i> to address challenges in infectious diseases and natural product discovery. This study exemplifies how genome mining can illuminate the ecological and clinical significance of microbial diversity.