<p>The degradation of cellulose, a pivotal component of plant cell walls, is predominantly mediated by a range of microbial enzymes and genetic pathways. This comprehensive analysis seeks to elucidate the genetic mechanisms underlying cellulose degradation, focusing on the enzyme-encoding genes and their regulatory networks in various organisms, including bacteria, fungi, and ruminants. Through a systematic review of recent studies, the diversity of cellulolytic enzymes, such as endoglucanases, exoglucanases, β-glucosidases, alongside their specific genetic regulations, is highlighted. Furthermore, the horizontal gene transfer (HGT) events that facilitate the acquisition of cellulose degradation capabilities among microorganisms, enabling ecological adaptability, are also explored. The findings underscore the importance of genomic and transcriptomic approaches to understanding the complex interactions and evolutionary adaptations that shape cellulose degradation pathways. This knowledge holds significant implications for biotechnology, particularly in biofuel production and waste management processes, where efficient cellulose breakdown is crucial for converting biomass into fermentable sugars. Ultimately, this analysis contributes to a deeper understanding of the genetic frameworks that govern cellulose degradation and highlights potential biotechnological applications that can leverage microbial cellulolytic systems.</p>