Abstract: Described herein are ceDNA vectors having linear and continuous structure for delivery and expression of a transgene. ceDNA vectors comprise an expression cassette flanked by two ITR sequences, where the expression cassette comprises a codon optimized nucleic acid sequence encoding a PAH protein, in combination with particular promoter sequences and cis-regulatory elements. Further provided herein are methods and cell lines for reliable gene expression of PAH protein in vitro, ex vivo and in vivo using the ceDNA vectors. Also provided herein are methods and compositions comprising ceDNA vectors useful for the expression of PAH protein in a cell, tissue or subject, and methods of treatment of diseases with said ceDNA vectors expressing PAH protein. Such PAH protein can be expressed for treating disease, e.g., Phenylketonuria (PKU).

Abstract: Provided herein are lipid formulations comprising a lipid and a capsid free, non-viral vector (e.g. ceDNA). Lipid particles (e.g., lipid nanoparticles) of the invention include a lipid formulation that can be used to deliver a capsid-free, non-viral DNA vector to a target site of interest (e.g., cell, tissue, organ, and the like).