In Situ Modification of Tissue Stem and Progenitor Cell Genomes

Cell Rep. 2019 Apr 23;27(4):1254-1264.e7. doi: 10.1016/j.celrep.2019.03.105.

Abstract

In vivo delivery of genome-modifying enzymes holds significant promise for therapeutic applications and functional genetic screening. Delivery to endogenous tissue stem cells, which provide an enduring source of cell replacement during homeostasis and regeneration, is of particular interest. Here, we use a sensitive Cre/lox fluorescent reporter system to test the efficiency of genome modification following in vivo transduction by adeno-associated viruses (AAVs) in tissue stem and progenitor cells. We combine immunophenotypic analyses with in vitro and in vivo assays of stem cell function to reveal effective targeting of skeletal muscle satellite cells, mesenchymal progenitors, hematopoietic stem cells, and dermal cell subsets using multiple AAV serotypes. Genome modification rates achieved through this system reached >60%, and modified cells retained key functional properties. This study establishes a powerful platform to genetically alter tissue progenitors within their physiological niche while preserving their native stem cell properties and regulatory interactions.

Keywords: AAV; dermal; gene modification; hematopoietic; mesenchymal; muscle; progenitor; satellite cell; stem cell.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Cell Differentiation*
  • Cell Movement
  • Dependovirus / classification
  • Dependovirus / genetics*
  • Female
  • Gene Transfer Techniques
  • Genetic Therapy
  • Genome*
  • Hematopoietic Stem Cells / cytology*
  • Hematopoietic Stem Cells / metabolism
  • Humans
  • Male
  • Mice, Inbred C57BL
  • Mice, Inbred mdx
  • Satellite Cells, Skeletal Muscle / cytology*
  • Satellite Cells, Skeletal Muscle / metabolism
  • Skin / cytology*
  • Skin / metabolism