Multiplex HDR for disease and correction modeling of SCID by CRISPR genome editing in human HSPCs

Ortal Iancu, Daniel Allen, Orli Knop, Yonathan Zehavi, Dor Breier, Adaya Arbiv, Atar Lev, Yu Nee Lee, Katia Beider, Arnon Nagler, Raz Somech, Ayal Hendel

Research output: Contribution to journalArticlepeer-review


Severe combined immunodeficiency (SCID) is a group of disorders caused by mutations in genes involved in the process of lymphocyte maturation and function. CRISPR-Cas9 gene editing of the patient's own hematopoietic stem and progenitor cells (HSPCs) ex vivo could provide a therapeutic alternative to allogeneic hematopoietic stem cell transplantation, the current gold standard for treatment of SCID. To eliminate the need for scarce patient samples, we engineered genotypes in healthy donor (HD)-derived CD34+ HSPCs using CRISPR-Cas9/rAAV6 gene-editing, to model both SCID and the therapeutic outcomes of gene-editing therapies for SCID via multiplexed homology-directed repair (HDR). First, we developed a SCID disease model via biallelic knockout of genes critical to the development of lymphocytes; and second, we established a knockin/knockout strategy to develop a proof-of-concept single-allelic gene correction. Based on these results, we performed gene correction of RAG2-SCID patient-derived CD34+ HSPCs that successfully developed into CD3+ T cells with diverse TCR repertoires in an in vitro T cell differentiation platform. In summary, we present a strategy to determine the optimal configuration for CRISPR-Cas9 gene correction of SCID using HD-derived CD34+ HSPCs, and the feasibility of translating this gene correction approach in patient-derived CD34+ HSPCs.

Original languageEnglish
Pages (from-to)105-121
Number of pages17
JournalMolecular Therapy Nucleic Acids
StatePublished - 14 Mar 2023


  • CRISPR-Cas9
  • HSPCs
  • MT: RNA/DNA Editing
  • RAG2
  • SCID
  • gene regulation
  • genome editing
  • rAAV6

All Science Journal Classification (ASJC) codes

  • Drug Discovery
  • Molecular Medicine


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