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Journal of Virology, June 2003, p. 6799-6810, Vol. 77, No. 12
0022-538X/03/$08.00+0     DOI: 10.1128/JVI.77.12.6799-6810.2003

Cloning of an Avian Adeno-Associated Virus (AAAV) and Generation of Recombinant AAAV Particles

Ioannis Bossis and John A. Chiorini*

Gene Therapy and Therapeutics Branch, NIDCR, NIH, Bethesda, Maryland 20892

Received 2 December 2002/ Accepted 28 March 2003

Recent studies have proposed that adeno-associated viruses (AAVs) are not evolutionarily linked to other mammalian autonomous parvoviruses but are more closely linked to the autonomous parvoviruses of birds. To better understand the relationship between primate and avian AAVs (AAAVs), we cloned and sequenced the genome of an AAAV (ATCC VR-865) and generated recombinant AAAV particles. The genome of AAAV is 4,694 nucleotides in length and has organization similar to that of other AAVs. The entire genome of AAAV displays 56 to 65% identity at the nucleotide level with the other known AAVs. The AAAV genome has inverted terminal repeats of 142 nucleotides, with the first 122 forming the characteristic T-shaped palindromic structure. The putative Rep-binding element consists of a tandem (GAGY)4 repeat, and the putative terminal resolution site (trs), CCGGT/CG, contains a single nucleotide substitution relative to the AAV2 trs. The Rep open reading frame of AAAV displays 50 to 54% identity at the amino acid level with the other AAVs, with most of the diversity clustered at the carboxyl and amino termini. Comparison of the capsid proteins of AAAV and the primate dependoviruses indicate that divergent regions are localized to surface-exposed loops. Despite these sequence differences, we were able to produce recombinant AAAV particles carrying a lacZ reporter gene by cotransfection in 293T cells and were able to examine transduction efficiency in both chicken primary cells and several cell lines. Our findings indicate that AAAV is the most divergent AAV described to date but maintains all the characteristics unique to the genera of dependovirus.

* Corresponding author. Mailing address: NIH 10/1N113, 10 Center Dr., MSC 1190, Bethesda, MD 20892-1190. Phone: (301) 496-4279. Fax: (301) 402-1228. E-mail: Jchiorini{at}dir.nidcr.nih.gov.

Journal of Virology, June 2003, p. 6799-6810, Vol. 77, No. 12
0022-538X/03/$08.00+0     DOI: 10.1128/JVI.77.12.6799-6810.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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