Newborn Liver Cells Boost Paediatric Gene Therapy
Tiny Liver Cells, Big Hope: New Gene Therapy Strategies for Children
For families facing the daunting reality of inherited liver diseases in their children, a beacon of hope shines brighter thanks to groundbreaking research from the San Raffaele Telethon Institute for Gene Therapy (SR-Tiget). Scientists have discovered that a surprisingly small group of liver cells, called clonogenic hepatocytes, are the powerhouses behind the organ’s growth, driving over 90% of its development. This discovery, published in the esteemed Journal of Hepatology, could revolutionize how we approach gene therapy for young patients.
Think of the liver as a vast construction site. This research pinpoints the key builders - the clonogenic hepatocytes – among the many workers. By understanding how these cells operate, scientists can develop more precise and effective gene therapies to correct inherited liver diseases early in life, possibly offering long-lasting solutions.
The SR-Tiget team used cutting-edge technologies to map the intricate landscape of the developing liver.They combined single-cell analysis, spatial mapping, and mathematical models to understand how liver cells multiply and mature after birth.This thorough approach allowed them to not only identify the crucial clonogenic cells but also to decipher the molecular signals that control their activity.
“Imagine having a GPS for liver cells,” explains Dr.Michela Milani, co-first author of the study. “Spatial transcriptomics allowed us to pinpoint the exact location and identity of hepatocytes during postnatal liver growth. It gave us an unprecedented view into how diffrent liver cell types multiply and mature.”
The research revealed that gene editing, specifically a process called homology-directed repair (HDR), is particularly effective within these clonogenic hepatocytes. This means that targeting these cells with gene therapy can lead to a significant expansion of healthy, gene-edited liver tissue.
However, the study also highlighted the importance of timing and location. Lentiviral vectors, another method of gene delivery, spread more evenly across the liver but are less effective in certain areas as the liver matures. dr. Francesco Starinieri, co-first author, emphasizes the importance of this finding: “Knowing that the liver becomes less receptive to gene transfer in specific zones as it matures helps us refine not just what cells to target, but also when to treat.”
Intriguingly, the researchers discovered