The vast majority of prokaryotes have not yet been cultivated due to several factors, including low abundance, slow growth rates, unknown growth requirements, dependency or interactions with other organisms (Gutleben et al., 2018; Overmann et al., 2017; Vartoukian et al., 2010; Lewis et al., 2021). Additionally, the immense biodiversity and unexplored habitats in which these organisms exist, along with their potential disinclination for cultivation using conventional methods, have made the study of these uncultivated prokaryotes a critical frontier in microbiology, unveiling extensive and previously unexplored microbial diversity (Rinke et al., 2013; Huber et al., 2007; Parks et al., 2017; Lloyd et al., 2018). Despite significant challenges, recent advancements in omics technologies have provided invaluable insights into the ecological roles, systematics, and metabolic capacities of these elusive microorganisms (Garza and Dutilh, 2015; Lewis et al., 2021). Traditionally, many prokaryotes have been considered difficult or even impossible to culture using conventional methods, discouraging many microbiologists from studying them and leaving much of the microbial diversity undiscovered. However, innovative approaches leveraging metagenome-assembled genomes (MAGs) and single-cell amplified genomes (SAGs) are now shedding light on their biology, potentially guiding the development of tailored cultivation strategies and challenging the long-held paradigm of “uncultivability.” These techniques significantly broaden our understanding of microbial diversity, ecological interactions and roles, and evolutionary history (Gutleben et al., 2018; Lewis and Ettema, 2019; Lewis et al., 2021; Xie et al., 2021; Liu et al., 2022; Laugier, 2023). Coupled with innovative culturing techniques such as co-cultivation strategies, microfluidics, and synthetic biology, these developments are establishing culturomics as a valuable complement to omics-based studies. Further pushing the boundaries of microbial discovery is essential for unraveling the functioning of complex microbial communities that have long been unknown or have evaded traditional cultivation methods (Lagier et al., 2012; Nowrotek et al., 2019).

The seven studies presented in this Research Topic highlight the dynamic roles of uncultivated prokaryotes across diverse ecological settings, progress in their genomic characterization, and implications for systematics. These papers illustrate how advances in omics technologies are deepening our understanding of microbial diversity, ecological significance, and taxonomy. They emphasize the growing importance of genomic data in unraveling the complex ecological functions of uncultivated taxa and their potential contributions to improve applications in biotechnology and environmental science.

These studies collectively demonstrate the growing significance of omics in advancing our understanding of microbial diversity, ecological significance, and systematics of uncultivated taxa. As research continues to explore these uncharted microbial realms, it is becoming increasingly clear that the uncultivated prokaryotic world holds the keys too many crucial ecological processes and evolutionary mysteries. This collection of research not only enhances our knowledge of microbial systems but also opens a wealth of new possibilities for biotechnology and environmental management.

In conclusion, exploring uncultivated prokaryotes offers a vital perspective for understanding life's complexities across diverse environments. As these studies demonstrate, the future of microbiology lies not only in studying cultivated microbes but also in deciphering the genomes, functioning, and ecological roles of those yet to be cultured.