Scientists from Scripps Research and UC San Diego have developed a new technology that maps protein production in individual brain cells. The technique, called Ribo-STAMP, was used to analyze nearly 20,000 cells in the mouse hippocampus, a region important for learning and memory. Their findings were published in Nature on February 18, 2026.
"This gave us an entirely different angle to look at the hippocampus, and we found a lot of new and exciting things," said Giordano Lippi, associate professor at Scripps Research and co-leader of the study. "This sort of foundational work is needed to eventually understand what goes wrong at the onset of brain diseases."
Protein production in cells begins when DNA is transcribed into messenger RNA (mRNA), which then serves as a template for making proteins. While scientists often measure mRNA levels to estimate protein production, this method has limitations in brain cells because mRNA can be stored for later use rather than being immediately translated into proteins.
"It's been difficult to measure mRNA translation in single cells, despite the field of single cell transcriptomics expanding across tissues, conditions and diseases," said Yeo. "We developed this technology in hopes that it will lead to a more complete picture."
Ribo-STAMP works by attaching an enzyme to ribosomes—the structures responsible for translating mRNA into proteins. As translation occurs, the enzyme marks changes on the RNA strand that can later be detected through standard sequencing methods.
Applying Ribo-STAMP to brain tissue revealed unexpected differences between types of neurons involved in memory. For example, CA3 pyramidal neurons produced proteins at much higher rates than CA1 neurons, even though both play similar roles in memory circuits. This suggests that these neuron types are less alike than previously thought and highlights the importance of translation in memory processes.
The research also explored how different versions of mRNA from the same gene—called isoforms—affect protein output. The team found that isoforms with longer regulatory regions were translated more efficiently into proteins within hippocampal neurons. This could help explain why changes in isoform expression are linked with neurological disorders.
"Previous work has shown how changes in isoform expression strongly correlate with neurological disorders, but the reason behind that hasn't been well-understood," said Lippi. "Our work suggests that if cells prefer one isoform over another, they may actually be changing protein levels."
Another finding showed that individual neurons can exist in distinct "high" or "low" translation states. Neurons with high translation activity produced more proteins related to communication and energy production compared to those with low activity.
Yeo stated that their dataset provides an initial look at the brain's "translatome," referring to all mRNAs actively being made into proteins. He noted this research opens up further investigation into how healthy brain cells manage protein production and its implications for disease.
