Adding to hottod's informative post, from what I understand of the process of certain 'viral vector' delivery of genes. A virus cell (such as adeno virus/ AAV) has it's own viral gene removed and replaced with a therapeutic gene that is capable of replacing the target defective gene within a cell nucleus. The AAV then transports the therapeutic gene though the cell wall and to the nucleus where it is released. These carriers are not peptides, they are virus cells that have their genes replaced with therapeutic genes.
Here is a video on AAVs
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(20min delay)