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Identification and genomic characterization of a novel human torque teno virus of 3.2 kb

¹ Division of Virology, Department of Infection and Immunity, Jichi Medical University School of Medicine, Tochigi-Ken 329-0498, Japan
² Department of Gastroenterology, Tohoku University Graduate School of Medicine, Sendai 980-8574, Japan
³ International Research and Educational Institute for Integrated Medical Sciences, Tokyo Women's Medical University, Tokyo 162-8666, Japan

Correspondence
Hiroaki Okamoto
hokamoto{at}jichi.ac.jp

In the process of searching for the recently described small anelloviruses 1 and 2 (SAVs) with the genomic DNA length of 2.2 or 2.6 kb in human sera, we isolated a novel virus with its genomic organization resembling those of torque teno virus (TTV) of 3.8–3.9 kb and torque teno mini virus (TTMV) of 2.8–2.9 kb. The entire genomic sequence of three isolates (MD1-032, MD1-073 and MD2-013), which comprised 3242–3253 bases and exhibited 76–99 % identities with the SAVs within the overlapping sequence, was determined. Although the MD1-032, MD1-073 and MD2-013 isolates differed by 10–28 % from each other over the entire genome, they segregated into the same cluster and were phylogenetically distinguishable from all reported TTVs and TTMVs. These results suggest that SAVs are deletion mutants of the novel virus with intermediate genomic length between those of TTV and TTMV and that the novel virus can be classified into a third group of the genus Anellovirus.

The GenBank/EMBL/DDBJ accession numbers for the nucleotide sequences reported in this paper are AB290917–AB290925.

Supplementary material is available with the online version of this paper.

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