Provided herein are methods of producing an adeno-associated virus (AAV) product and methods of purifying adeno-associated virus. AAV is loaded onto an affinity resin, wash steps are undertaken at room temperature, and AAV is eluted from the affinity resin at a lower temperature. Various buffers are disclosed for use in the wash steps and elution.

The present disclosure provides sensitive and robust assays for determining the potency of payloads encoded by recombinant viral vectors. Particularly, the present disclosure provides assays to determine the potency of SMN polypeptide as expressed by recombinant viral vectors used for the treatment of spinal muscular atrophy. The present description encompasses, inter alia, methods for determining potency (e.g., biological activity), e.g., relative potency, of a recombinant viral vector.

Methods to prepare recombinant adeno-associated virus (AAV) capsids with altered tropism and compositions having AAVs with altered tropism are provided.

Methods for separating AAV empty capsids from mixtures of AAV vector particles and AAV empty capsids are described. The methods use column chromatography techniques and provide for commercially viable levels of recombinant AAV virions.

The present invention relates to a recombinant expression cassette comprising a polynucleotide encoding a SMN protein. This cassette can be included in a gene therapy vector and used in a method for the treatment of spinal muscular atrophy (SMA).

The present disclosure provides enzyme replacement therapy using gene therapy vectors, such as adeno-associated virus (AAV) vectors expressing human Cystathionine Beta-Synthase (CBS) to reduce the amount of serum homocysteine (Hcy) and increase the amount of downstream metabolites, such as cystathionine and cysteine (Cys), which can be used for treatment of diseases, such as homocystinuria and homocysteine remethylation disorders.

Provided herein are methods of improving rAAV production in cells, the method comprising increasing the salt concentration in the media in which the cells are infected or transfected, cultured, or in which they produce AAV. Aspects of the disclosure relate to improved methods of rAAV production by co-infecting suspension adapted cells (e.g., suspension adapted HEK293 cells) with viruses that encode one or more AAV components for producing rAAV particles within the suspension adapted cells.

The present disclosure describes methods and systems for use in the production of adeno-associated virus (AAV) particles, including recombinant adeno-associated virus (rAAV) particles. In certain embodiments, the production process and system use Baculoviral Expression Vectors (BEVs) in the production of AAV particles. In certain embodiments, the production process and system use Spodoptera frugiperda insect cells (such as Sf9 or Sf21) as viral production cells. In certain embodiments, the production process and system use BEVs which lacks a portion or an entirety of the v-cath gene or includes a mutationally inactivated version of the v-cath gene.

The present disclosure provides a variant AAV capsid protein that confers tropism to lung cells and recombinant adeno-associated viruses comprising the variant AAV and pharmaceutical compositions comprising same and their use in the delivery of heterologous nucleic acids to lung cells for the treatment of pulmonary disorders.

Provided herein are recombinant adeno-associated virus (rAAV) compositions that can restore phenylalanine hydroxylase (PAH) gene function in cells, and methods for using the same to treat diseases associated with reduction of PAH gene function (e.g., PKU). Also provided are nucleic acids, vectors, packaging systems, and methods for making the adeno-associated virus compositions.