1887

Abstract

A human adenovirus (HAdV) species D, was isolated from a hospitalised child with severe lower respiratory infection. It was initially detected in the nasopharyngeal aspirate of the child followed by conventional PCR amplification of the hexon, penton base, and fibre genes. Sanger DNA sequencing and phylogenetic analyses showed characteristics of a recombinant genome not described before. Next Generation Sequencing analysis was performed to reconstruct its complete DNA genome after viral isolation in adenocarcinoma human cell line (A549). A complete genomic sequence of 35.2 kb in length, with a G+C content of 57 % was obtained, related to HAdV-D29 (96 % identity). Imputed serology analysis demonstrated its novel type with a nucleotide sequence identity of 95.3 % (hexon loop 1) and 96 % (hexon loop 2) to HAdV-D9. The penton base gene showed a novel sequence, distantly related to HAdV-D44. The E3 and E4 regions evolved significantly from their ancestors. The fibre gene was almost identical to the knob region of HAdV-D15 but showed an unrelated shaft sequence. In conclusion the genomics of this novel HAdV, designated the HAdV-D83 [P83H9F15] prototype and bearing a new penton base gene, supports the importance of viral evolution to understand modified tissue tropism, enhanced transmission, or altered virulence.

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2017-10-17
2019-10-17
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