Transient inhibition of 53BP1 increases the frequency of targeted integration in human hematopoietic stem and progenitor cells.

Ron Baik, M Kyle Cromer, Steve E Glenn, Christopher A Vakulskas, Kay O Chmielewski, Amanda M Dudek, William N Feist, Julia Klermund, Suzette Shipp, Toni Cathomen, Daniel P Dever, Matthew H Porteus
Author Information
  1. Ron Baik: Institute for Stem Cell Biology and Regenerative Medicine, Stanford University School of Medicine, Lorry I. Lokey Stem Cell Research Building, 265 Campus Drive, Stanford, CA, USA. ORCID
  2. M Kyle Cromer: Institute for Stem Cell Biology and Regenerative Medicine, Stanford University School of Medicine, Lorry I. Lokey Stem Cell Research Building, 265 Campus Drive, Stanford, CA, USA. ORCID
  3. Steve E Glenn: Integrated DNA Technologies, Inc., Coralville, IA, USA.
  4. Christopher A Vakulskas: Integrated DNA Technologies, Inc., Coralville, IA, USA. ORCID
  5. Kay O Chmielewski: Institute for Transfusion Medicine and Gene Therapy, Medical Center - University of Freiburg, 79106, Freiburg, Germany.
  6. Amanda M Dudek: Institute for Stem Cell Biology and Regenerative Medicine, Stanford University School of Medicine, Lorry I. Lokey Stem Cell Research Building, 265 Campus Drive, Stanford, CA, USA.
  7. William N Feist: Institute for Stem Cell Biology and Regenerative Medicine, Stanford University School of Medicine, Lorry I. Lokey Stem Cell Research Building, 265 Campus Drive, Stanford, CA, USA. ORCID
  8. Julia Klermund: Institute for Transfusion Medicine and Gene Therapy, Medical Center - University of Freiburg, 79106, Freiburg, Germany. ORCID
  9. Suzette Shipp: Institute for Stem Cell Biology and Regenerative Medicine, Stanford University School of Medicine, Lorry I. Lokey Stem Cell Research Building, 265 Campus Drive, Stanford, CA, USA.
  10. Toni Cathomen: Institute for Transfusion Medicine and Gene Therapy, Medical Center - University of Freiburg, 79106, Freiburg, Germany. ORCID
  11. Daniel P Dever: Institute for Stem Cell Biology and Regenerative Medicine, Stanford University School of Medicine, Lorry I. Lokey Stem Cell Research Building, 265 Campus Drive, Stanford, CA, USA.
  12. Matthew H Porteus: Institute for Stem Cell Biology and Regenerative Medicine, Stanford University School of Medicine, Lorry I. Lokey Stem Cell Research Building, 265 Campus Drive, Stanford, CA, USA. mporteus@stanford.edu. ORCID

Abstract

Genome editing by homology directed repair (HDR) is leveraged to precisely modify the genome of therapeutically relevant hematopoietic stem and progenitor cells (HSPCs). Here, we present a new approach to increasing the frequency of HDR in human HSPCs by the delivery of an inhibitor of 53BP1 (named "i53") as a recombinant peptide. We show that the use of i53 peptide effectively increases the frequency of HDR-mediated genome editing at a variety of therapeutically relevant loci in HSPCs as well as other primary human cell types. We show that incorporating the use of i53 recombinant protein allows high frequencies of HDR while lowering the amounts of AAV6 needed by 8-fold. HDR edited HSPCs were capable of long-term and bi-lineage hematopoietic reconstitution in NSG mice, suggesting that i53 recombinant protein might be safely integrated into the standard CRISPR/AAV6-mediated genome editing protocol to gain greater numbers of edited cells for transplantation of clinically meaningful cell populations.

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Grants

  1. P30 CA008748/NCI NIH HHS
  2. R01 HL135607/NHLBI NIH HHS

MeSH Term

Humans
Animals
Mice
Gene Editing
Hematopoietic Stem Cells
Hematopoietic Stem Cell Transplantation
Recombinant Proteins
Peptides
CRISPR-Cas Systems

Chemicals

Recombinant Proteins
Peptides