Penn Researchers Create Breakthrough Method for Designing Human Artificial Chromosomes
Researchers at the Perelman School of Medicine at the University of Pennsylvania have achieved a significant breakthrough in the field of human artificial chromosomes (HACs), potentially transforming gene therapies and laboratory research.
Their study, published in Science, introduces a novel method for constructing HACs using single, long DNA constructs, addressing a major challenge in the field: the tendency for DNA to form unpredictable multimers.
Traditional HAC production methods faced difficulties because DNA constructs often joined together in erratic patterns, complicating their application.
The Penn team’s new approach allows for more precise and efficient HAC creation. This advancement could speed up DNA research and, with effective delivery systems, improve gene therapies for diseases such as cancer.
The researchers used larger DNA constructs with complex centromeres to produce HACs more reliably. These constructs form HACs that can self-replicate during cell division. Additionally, a yeast-cell-based delivery system was employed to handle the larger DNA constructs.
This method overcomes previous limitations by increasing the size of the DNA input, which helps maintain it in a single copy rather than forming unpredictable multimers.
The resulting HACs provide a safer and more stable platform for gene expression compared to virus-based delivery systems, which can provoke immune responses and involve risky viral integrations.
The production also support the expression of large, complex gene sets, enabling the development of sophisticated protein machines.
The techniques developed could also be applied to other organisms, including plants, potentially leading to innovations in agriculture such as pest-resistant and high-yield crops.
The research involved collaborations with the J. Craig Venter Institute, the University of Edinburgh, and the Technical University Darmstadt and was supported by several National Institutes of Health grants.
