A differentiated β-globin gene replacement strategy uses heterologous introns to restore physiological expression.

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Tác giả: Gaia Andreoletti, Christopher Bandoro, Glen M Chew, Aishwarya R Churi, Lana Corbo, Daniel P Dever, Craig L Ennis, Trevor L Gerstenberg, Jane L Grogan, Kaisle A Hill, Shaheen Kabir, Timothy D Klasson, Kristina Krassovsky, Cassandra D Lalisan, William M Matern, James R Partridge, Juan A Perez-Bermejo, Matthew H Porteus, B Joy Quejarro, Brian J Silva, Yuri G Strukov, Sebastian Treusch, Jon E Vincelette, Kirby A Wallace, Beeke Wienert

Ngôn ngữ: eng

Ký hiệu phân loại:

Thông tin xuất bản: United States : Molecular therapy : the journal of the American Society of Gene Therapy , 2025

Mô tả vật lý:

Bộ sưu tập: NCBI

ID: 734810

β-hemoglobinopathies are common monogenic disorders. In sickle cell disease (SCD) a single mutation in the β-globin (HBB) gene results in dysfunctional hemoglobin protein, while in β-thalassemia, over 300 mutations distributed across the gene reduce β-globin levels and cause severe anemia. Genetic engineering replacing the whole HBB gene through homology directed repair (HDR) is an ideal strategy to restore a benign genotype and rescue HBB expression for most genotypes. However, this is technically challenging because 1) the insert must not be homologous to the endogenous gene and 2) synonymous codon-optimized, intron-less sequences may not reconstitute adequate β-globin levels. Here, we developed an HBB gene replacement strategy using CRISPR-Cas9 that successfully addresses these challenges. We determined that a DNA donor containing a diverged HBB coding sequence and heterologous introns to avoid sequence homology provides proper physiological expression. We identified a DNA donor that uses truncated γ-globin introns, results in 34% HDR, rescues β-globin expression in in vitro models of SCD and β-thalassemia in hematopoietic stem and progenitor cells (HSPCs). Furthermore, while HDR allele frequency dropped in vivo, it was maintained at ∼15%, demonstrating editing of long-term repopulating HSPCs. In summary, our HBB gene replacement strategy offers a differentiated approach by restoring naturally regulated adult hemoglobin expression.
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