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Single-Stranded γPNAs for In Vivo Site-Specific Genome Editing via Watson-Crick Recognition

[ Vol. 14 , Issue. 5 ]

Author(s):

Raman Bahal, Elias Quijano, Nicole A. McNeer, Yanfeng Liu, Dinesh C. Bhunia, Francesco Lopez-Giraldez, Rachel J. Fields, William M. Saltzman, Danith H. Ly and Peter M. Glazer   Pages 331 - 342 ( 12 )

Abstract:


Triplex-forming peptide nucleic acids (PNAs) facilitate gene editing by stimulating recombination of donor DNAs within genomic DNA via site-specific formation of altered helical structures that further stimulate DNA repair. However, PNAs designed for triplex formation are sequence restricted to homopurine sites. Herein we describe a novel strategy where next generation single-stranded gamma PNAs (γPNAs) containing miniPEG substitutions at the gamma position can target genomic DNA in mouse bone marrow at mixed-sequence sites to induce targeted gene editing. In addition to enhanced binding, γPNAs confer increased solubility and improved formulation into poly(lactic-co-glycolic acid) (PLGA) nanoparticles for efficient intracellular delivery. Single-stranded γPNAs induce targeted gene editing at frequencies of 0.8% in mouse bone marrow cells treated ex vivo and 0.1% in vivo via IV injection, without detectable toxicity. These results suggest that γPNAs may provide a new tool for induced gene editing based on Watson-Crick recognition without sequence restriction.

Keywords:

β-globin, genome editing, GFP, nanoparticle, PLGA, PNA.

Affiliation:

Yale School of Medicine, Dept. of Therapeutic Radiology, P.O. Box 208040, New Haven, Connecticut 06520-8040, USA.



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