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J. Virol., Jan 1998, 309-319, Vol 72, No. 1
EA Rutledge, CL Halbert and DW Russell
Adeno-associated viruses (AAVs) are single-stranded dependent parvoviruses
being developed as transducing vectors. Although at least five serotypes
exist (AAV types 1 to 5 [AAV1 to -5]), only AAV2, AAV3, and AAV4 have been
sequenced, and the vectors in use were almost all derived from AAV2. Here
we report the cloning and sequencing of a second AAV3 genome and a new AAV
serotype designated AAV6 that is related to AAV1. AAV2, AAV3, and AAV6 were
82% identical at the nucleotide sequence level, and AAV4 was 75 to 78%
identical to these AAVs. Significant sequence variation was noted in
portions of the capsid proteins that presumably are responsible for
serotype-specific functions. Vectors produced from AAV3 and AAV6 differed
from AAV2 vectors in host range and serologic reactivity. The AAV3 and AAV6
vector serotypes were able to transduce cells in the presence of serum from
animals previously exposed to AAV2 vectors. Our results suggest that
vectors based on alternative AAV serotypes will have advantages over
existing AAV2 vectors, including the transduction of different cell types,
and resistance to neutralizing antibodies against AAV2. This could be
especially important for gene therapy, as significant immunity against AAV2
exists in human populations and many protocols will likely require multiple
vector doses.
Copyright © 1998, American Society for Microbiology
Infectious clones and vectors derived from adeno-associated virus (AAV) serotypes other than AAV type 2
Division of Hematology and Markey Molecular Medicine Center, University of Washington, Seattle 98195, USA.
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