Hebrew University Researchers Identify RNA Dicing Mechanism Creating Dangerous Cancer Driving Protein Fragments

Scientists identify RNA dicing as a hidden mechanism fueling cancer. Learn how truncated JAK1 proteins drive tumors and reveal new therapeutic vulnerabilities.

By: AXL Media

Published: Apr 29, 2026, 6:21 AM EDT

Source: Information for this report was sourced from The Hebrew University of Jerusalem via Eurekalert

The Discovery of Genetic Slicing Mechanisms

A scientific team led by Dr. Yuval Malka and Dr. William Faller has identified a biological shortcut that allows cancer cells to bypass traditional protein synthesis. This mechanism, dubbed RNA dicing, involves the physical cutting of RNA molecules into smaller, functional pieces. According to the research published in Cell Reports, these fragments do not merely represent cellular waste but instead serve as templates for creating shortened proteins that can drastically alter cellular behavior. This finding suggests that the path from gene to protein is significantly more versatile and potentially more hazardous than previously documented in academic literature.

The Role of the JAK1 Gene in Tumor Progression

The investigation focused primarily on the JAK1 gene, a well-known regulator of immune signaling and cellular division. While a standard JAK1 protein helps maintain physiological equilibrium, the researchers found that RNA dicing produces a stripped down version of the molecule. This truncated form consists mainly of the JH1 kinase domain, which functions as the active engine of the protein. According to the study authors, this fragment operates independently of the regulatory controls that usually govern full length proteins, effectively pushing cells toward a state of uncontrolled and rapid growth.

Mutational Imbalances in Endometrial Malignancies

The research highlights how specific genetic errors, known as nonsense mutations, act as a catalyst for this destructive process. In a typical scenario, these mutations would serve to disable a gene, but in the context of RNA dicing, they appear to suppress the helpful, tumor-suppressing form of JAK1 while simultaneously boosting the shorter, oncogenic version. This imbalance is particularly evident in endometrial cancers, where the presence of these diced protein fragments may be a primary driver behind more aggressive and difficult to treat tumor phenotypes.