One of the defining environmental challenges of the industrial era is hydrocarbon pollution. Petroleum-derived compounds such as polycyclic aromatic hydrocarbons (PAHs) were not present in nature at the concentrations generated by human activities and therefore represent, from an evolutionary perspective, a relatively recent ecological novelty. Most organisms lack the biochemical machinery needed to transform these complex and often toxic molecules. Microorganisms, however, possess an extraordinary capacity to evolve and diversify their metabolic pathways, allowing some bacterial lineages to convert hydrocarbons into progressively simpler, less harmful compounds.
At first glance, this appears to offer a straightforward biological solution to oil pollution. The reality is more complex. Very few microorganisms possess the complete set of enzymes required to fully degrade highly recalcitrant compounds such as pyrene and other PAHs. Instead, biodegradation is typically a cooperative process in which different microbial species perform distinct metabolic steps. One organism may transform the original contaminant into an intermediate metabolite, which another member of the community can then further process, creating a sequential degradation pathway that ultimately leads to complete remediation.
This challenge lies at the heart of the fellowship project conducted by Penélope Raposeiras Aldorino, which seeks to understand how natural microbial consortia assemble into effective biodegradation systems and, more specifically, to identify the functional role of each microbial member in the degradation of pyrene.
Carried out at Mónica Cala's laboratory at MetCore, Universidad de los Andes, the study examined the metabolites that appeared, accumulated, or disappeared throughout the degradation process. These metabolites act as molecular fingerprints of microbial activity and provide clues about which organism is responsible for each step of the degradation pathway.
The preliminary results reinforce the idea that effective bioremediation depends on cooperative microbial interactions rather than individual organisms acting alone.
Recent communications from UNU-BIOLAC have highlighted metabolomics as a powerful tool for sustainable development. This project provides an excellent example of that concept in practice. For that, we thank CINDEFI-UNLP and MetCore and Penélope Raposeiras Aldorino's supervisors and mentors, Sabrina Festa and Mónica Cala, whose expertise and guidance were instrumental to the success of this work.
