Different Types of Ribosomes Found to Produce Specific Proteins

The ribosome, a crucial molecular machine responsible for producing proteins in the human body, has been discovered to have a more intricate role than previously believed, according to researchers from the University of Copenhagen. Contrary to the assumption that ribosomes functioned similarly with all mRNA, the study revealed that different types of ribosomes produce specific proteins.

Led by Professor Anders H. Lund, the team made the discovery by examining cancer cells, which were found to have distinct ribosomes compared to other cells. This observation led them to investigate further and explore why various ribosome types exist and how they contribute to the body's development. Their findings were published in Developmental Cell.

The study involved analyzing mouse brains at various developmental stages and human stem cells capable of differentiating into multiple cell types. The researchers observed that ribosomes changed during development, suggesting their role in regular cellular development. Notably, ribosomes have a specific pattern with 114 chemical modifications that change during cell differentiation, potentially forming a code that determines the proteins the ribosome produces.

By removing a single modification and differentiating stem cells into nerve cells, the researchers noticed that the ribosomes produced different types of nerve cells than usual. This discovery demonstrates that ribosomes actively regulate the production of proteins, rather than being passive "translators" of mRNA into proteins.

The newfound knowledge holds significant implications for regenerative medicine, where specific cell types are created and transplanted into patients to restore normal body function. Understanding the regulatory function of ribosomes could lead to better control of this process and improve treatments for diseases like diabetes or Parkinson's. Moreover, the findings may pave the way for novel treatments for cancer, as the researchers suggest that specific ribosomes abundant in cancer cells could be targeted and inhibited, offering new therapeutic possibilities.