| CPC C12N 15/86 (2013.01) [C12N 7/00 (2013.01); C12Q 1/701 (2013.01); C12N 2750/14143 (2013.01); C12N 2750/14152 (2013.01); C12Q 2600/158 (2013.01)] | 19 Claims |

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1. A producer cell preparation for producing one or more recombinant adeno-associated virus particles, the producer cell preparation comprising:
a first nucleic acid vector containing a first construct, the first construct comprising a heterologous nucleic acid region encoding a first protein or polypeptide, and
a second nucleic acid vector containing a second construct, the second construct comprising a heterologous nucleic acid region encoding a second protein or polypeptide, wherein the first nucleic acid vector and the second nucleic acid vector are present at an initial ratio,
wherein the producer cell preparation is configured to produce a particle preparation comprising:
a first rAAV particle comprising the first construct, and
a second rAAV particle comprising the second construct, wherein the particle preparation comprises a target ratio of the first rAAV particle to the second rAAV particle within 15% of the initial ratio of the first nucleic acid vector to the second nucleic acid vector.
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