Genespire and the San Raffaele Telethon Institute for Gene Therapy announce publication in Nature Biotechnology on enhanced gene editing technique in hematopoietic stem cells
Italy, Milan, 30 June 2020: The San Raffaele Telethon Institute for Gene Therapy (SR-Tiget) and Genespire, a gene therapy company developing transformative therapies for genetic diseases, announce today the publication of data highlighting progress in the development of an improved targeted gene replacement technology in human hematopoietic stem cells (HSCs) in Nature Biotechnology.
The paper, entitled Efficient gene editing of human long-term hematopoietic stem cells validated by clonal tracking, outlines technology developed by Pr. Luigi Naldini and his team at SR-Tiget, which is included in the strategic alliance with Genespire. It shows increased homology directed recombination (HDR) efficiency in HSCs by forcing cell-cycle progression and transiently upregulating components of the HDR machinery. The findings are validated by clonal tracking of the edited HSCs in experimental transplantation models, which shows improved polyclonal engraftment by long-term repopulating HSCs.
People with genetic diseases affecting the hematopoietic lineage may benefit from corrective targeted gene therapy in HSCs. These cells are self renewing and can differentiate into all the cell types of the hematopoietic lineage, therefore providing the potential for a one-time therapy. As compared to standard gene replacement approaches, gene editing corrects the disease-causing mutation in situ, restoring both function and physiological expression control of the affected gene. In principle, this targeted strategy may fulfill the goal of precision medicine at the most stringent genetic level. Its realization in HSCs, however, has been hampered until now by low efficiency of HDR-driven repair, likely because of the quiescent state of the more primitive progenitors. Use of the improved gene editing technology developed by SR-Tiget has been shown to yield a greater percentage of gene-edited HSCs and increased clonality, or the number of modified cells transplanted and engrafted in the recipient. In a clinical setting this should lead to increased hematopoietic cells chimerism in the patient receiving the corrective HSC therapy, and could accelerate the hematopoietic recovery after conditioning and increase the size, long-term stability, and safety of the engineered cell graft.
This approach can be applied to genetic diseases originating in the hematopoietic lineage, including primary immune deficiencies (PIDs), a key area of focus for Genespire. Genespire will continue to work with SR-Tiget and apply this technology to its future pipeline of gene therapies.
Julia Berretta, Chief Executive Officer of Genespire, commented: The focus of Genespires alliance with SR-Tiget is to research and develop novel gene therapies, addressing severe diseases with high unmet medical need. We are pleased with the publication of these data in Nature Biotechnology, which provide valuable insights into this pioneering technology developed by SR-Tiget, and we look forward to our future work with them to translate cutting edge science into transformational therapies.
Professor Luigi Naldini, Director of SR-Tiget and scientific co-founder of Genespire, said Our findings elucidate and overcome two main biological barriers to efficient HDR-mediated gene editing in HSCs, and show by clonal tracking that our enhanced editing protocol preserves their multilineage and self-renewal capacity long term after serial transplant. We look forward to our future work with Genespire to explore its potential in primary immunodeficiencies.
The full publication details are below and can be accesed online here.
Efficient gene editing of human long-term hematopoietic stem cells validated by clonal tracking Samuele Ferrari, Aurelien Jacob, Stefano Beretta, Giulia Unali, Luisa Albano, Valentina Vavassori, Davide Cittaro, Dejan Lazarevic, Chiara Brombin, Federica Cugnata, Anna Kajaste-Rudnitski, Ivan Merelli, Pietro Genovese and Luigi Naldini
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About Genespire
Genespire is a biotechnology company focused on the development of transformative gene therapies for patients affected by genetic diseases, particularly primary immunodeficiencies and inherited metabolic diseases. Based in Milan, Italy, Genespire was founded in March 2020 by the gene therapy pioneer Prof. Luigi Naldini and Dr. Alessio Cantore, Fondazione Telethon and Ospedale San Raffaele. It is a spin-off of SR-Tiget, a world leading cell and gene therapy research institute and is backed by Sofinnova Partners. http://www.genespire.com
About SR-Tiget
Based in Milan, Italy, the San Raffaele-Telethon Institute for Gene Therapy (SR-Tiget) is a joint venture between the Ospedale San Raffaele and Fondazione Telethon. SR-Tiget was established in 1995 to perform research on gene transfer and cell transplantation and translate its results into clinical applications of gene and cell therapies for different genetic diseases. Over the years, the Institute has given a pioneering contribution to the field with relevant discoveries in vector design, gene transfer strategies, stem cell biology, identity and mechanism of action of innate immune cells. SR-Tiget has also established the resources and framework for translating these advances into novel experimental therapies and has implemented several successful gene therapy clinical trials for inherited immunodeficiencies, blood and storage disorders, which have already treated >115 patients and have led through collaboration with industrial partners to the filing and approval of novel advanced gene therapy medicines.
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Genespire and the San Raffaele Telethon Institute for Gene Therapy announce publication in Nature Biotechnology on enhanced gene editing technique in...
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