• Queuosine, a rare micronutrient from food and gut bacteria, is critical for brain function, memory, stress response and cancer defense—but until now, scientists didn't know how our bodies absorb it.

• Researchers at University of Florida and Trinity College Dublin discovered the SLC35F2 gene, the long-sought "transporter" that allows queuosine to enter cells, solving a 30-year scientific mystery.

• Queuosine fine-tunes gene expression by modifying transfer RNA, influencing everything from learning to tumor suppression—yet most people have never heard of it.

• The breakthrough could lead to new therapies for neurological disorders, cancer and metabolic diseases by leveraging queuosine's role in cellular health.

• The study highlights the power of the microbiome and diet in regulating genetic activity, opening doors for nutrition-based medical interventions.

For over 30 years, scientists knew that queuosine—a vitamin-like micronutrient found in trace amounts in foods like dairy, meat and fermented products—played a crucial role in human health. It modifies transfer RNA (tRNA), the molecular machines that help translate genetic code into proteins, influencing everything from memory formation to cancer suppression. Yet one glaring question remained unanswered: How does queuosine get into our cells?

This week, an international team of researchers—led by the University of Florida (UF) and Trinity College Dublin—published a groundbreaking study in the Proceedings of the National Academy of Sciences (PNAS) that finally solves the puzzle. They identified SLC35F2, a gene that acts as the gatekeeper, transporting queuosine into cells where it can work its magic.