CRISPR-AuNP: physicochemical optimization of a gold nanoparticle platform for cost-effective and modular non-viral gene editing in HSPCs.

Efficient delivery of CRISPR ribonucleoproteins into primary hematopoietic stem and progenitor cells (HSPCs) is essential for durable gene editing therapies but remains challenging. Here, we advance a modular, benchtop-assembled gold-polymer hybrid nanoparticle (CRISPR-AuNP) platform that enables non-viral delivery of multiple CRISPR systems into HSPCs. Guided by a mechanistic understanding of Cas9's interaction with gold surfaces, we engineered the formulation by conjugating pre-formed RNP-polymer complexes, assembled using thiolated polyethyleneimine-polyethylene glycol, to gold nanoparticles. This system achieved efficient editing in primary CD34+ HSPCs for Cas9, Cas12a, and Cas12a-M29-1 without compromising cell viability. Notably, the nanoformulation can be assembled in under 2 h in a PCR tube for less than $70/million HSPCs treated. This work establishes a scalable, cost-effective, and accessible gene editing system with the potential to democratize CRISPR applications in HSPC research and therapy.