The present disclosure describes methods and systems for use in the production of adeno-associated virus (AAV) particles, compositions, and formulations, including recombinant adeno-associated viruses (rAAV). The present disclosure presents cell culture mediums for use in producing adeno-associated viruses (AAV), such as AAV which comprise a polynucleotide encoding a payload. In certain embodiments, the cell culture medium comprises a hydrolysate mixture, L-glutamine, poloxamer 188 (e.g., 10% pluronic F-68), a lipid emulsion, and a cholesterol mixture. In certain embodiments, the production process and system use Spodoptera fmgiperda insect cells (such as Sf9 or Sf21) as viral production cells (VPCs). In certain embodiments, the production process and system use Baculo viral Expression Vectors (BEVs) and/or Baculoviral Infected Insect Cells (BIICs) in the production of rAAVs.

Disclosed are a novel recombinant transition vector for increasing expression of a foreign protein in a native form without fusion partners, and a method for mass production of a foreign target protein using the same. The recombinant transition vector according to the present disclosure may allow a large amount of a foreign target protein with a high therapeutic and prophylactic value to be expressed in an insect cell. In particular, the vector may increase the expression of the foreign target protein in an own form thereof, not fused with other fusion partners. Therefore, the use of the recombinant transition vector may produce useful proteins such as antigens in insect cells at low cost and high efficiency.

The present disclosure relates to a use of virus-like particles including Toxoplasma gondii apical membrane antigen 1 for serodiagnosing toxoplasmosis, wherein an enzyme-linked immunosorbent assay with an infected serum was conducted using virus-like particles expressing Toxoplasma gondii AMA1, and higher sensitivity than the existing Toxoplasma gondii antigen was observed using virus-like particles, and no false diagnosis such as false negatives and false positives appeared after a reaction with a malaria-infected serum and thus high specificity was identified.

Disclosed herein are nanoparticles suitable for use in vaccines. The nanoparticles present antigens from pathogens surrounded to and associated with a detergent core resulting in enhanced stability and good immunogenicity. Dosages, formulations, and methods for preparing the vaccines and nanoparticles are also disclosed.

A nucleic acid construct for improving an adeno-associated virus yield, and a construction method therefor. The nucleic acid construct includes: an adeno-associated virus (AAV) element, and a polynucleotide encoding an IE protein. Said AAV element includes a polynucleotide encoding a Cap protein, a polynucleotide encoding a Rep protein, and an AAV cis-regulatory element. The construction method includes integrating an AAV element carrying an exogenous target gene and a polynucleotide that encodes the IE protein into to a baculovirus vector backbone. The obtained recombinant adeno-associated virus (rAAV) has a low empty capsid rate, while the rAAV yield of a single cell and a unit volume culture is increased, the production cost is reduced, and the production is easy to scale up.

The present disclosure provides viral microparticles comprising genetically-engineered baculoviruses (at least partially) embedded in a polymeric matrix for the local delivery of therapeutic nucleic acid molecules to the cells of a vertebrate individual (optionally in combination with a medical implant such as vascular stent platform). The viral microparticles are especially useful for promoting the healing of a wound as well as the repair of a blood vessel and prevent pathological scarring. Also provided herein are processes for making the viral microparticles, pharmaceutical compositions comprising viral microparticles as well as sup-ports comprising the viral micro particles for the locating the viral microparticles in a wound or in the vicinity of a wound.

The present invention is directed to the expression and secretion the Zika virus envelope protein. Elements of the pre-membrane and envelope sequence have been modified to enhance the expression of the envelope protein as a secreted product in the culture medium of transformed insect cell lines. The expressed and purified product is suitable as a vaccine antigen.

Methods of determining the stoichiometry of a viral capsid and/or determining the heterogeneity of protein components in a viral capsid are disclosed.

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).

The present invention relates to production of proteins in insect cells whereby repeated coding sequences are used in baculoviral vectors. In particular the invention relates to the production of parvoviral vectors that may be used in gene therapy and to improvements in expression of the viral rep proteins that increase the productivity of parvoviral vectors.