Non-viral gene delivery agent comprising lipopeptide (LP) compounds

Non- viral nucleic acid delivery agents and methods for the delivery or transfer of nucleic acid molecules to target cells are disclosed. The agents comprise a complex of a nucleic acid cargo for delivery, one or more lipopeptide compound, and one or more polymeric charge-neutralising agent, and the complex is in the form of a particle with substantially neutral or negative surface charge. The agents and methods may be useful in a variety of applications such as therapies (including gene therapies and nucleic acid vaccinations) for diseases and medical disorders.