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Review
. 2017 Oct;53(5):675-683.
doi: 10.1007/s11262-017-1487-2. Epub 2017 Jul 15.

Getting genetic access to natural adenovirus genomes to explore vector diversity

Wenli Zhang  1 , Anja Ehrhardt  2
Affiliations
Review

Getting genetic access to natural adenovirus genomes to explore vector diversity

Wenli Zhang et al. Virus Genes. 2017 Oct.

Abstract

Recombinant vectors based on the human adenovirus type 5 (HAdV5) have been developed and extensively used in preclinical and clinical studies for over 30 years. However, certain restrictions of HAdV5-based vectors have limited their clinical applications because they are rather inefficient in specifically transducing cells of therapeutic interest that lack the coxsackievirus and adenovirus receptor (CAR). Moreover, enhanced vector-associated toxicity and widespread preexisting immunity have been shown to significantly hamper the effectiveness of HAdV-5-mediated gene transfer. However, evolution of adenoviruses in the natural host is driving the generation of novel types with altered virulence, enhanced transmission, and altered tissue tropism. As a consequence, an increasing number of alternative adenovirus types were identified, which may represent a valuable resource for the development of novel vector types. Thus, researchers are focusing on the other naturally occurring adenovirus types, which are structurally similar but functionally different from HAdV5. To this end, several strategies have been devised for getting genetic access to adenovirus genomes, resulting in a new panel of adenoviral vectors. Importantly, these vectors were shown to have a host range different from HAdV5 and to escape the anti-HAdV5 immune response, thus underlining the great potential of this approach. In summary, this review provides a state-of-the-art overview of one essential step in adenoviral vector development.

Keywords: Adenovirus; Adenovirus diversity, cloning; Gene medicine; Vectorization.

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