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Memórias do Instituto Oswaldo Cruz

versão impressa ISSN 0074-0276versão On-line ISSN 1678-8060


DINIZ-MENDES, Leonardo; DEVALLE, Sylvie  e  NIEL, Christian. Genomic characterization of a Brazilian TT Virus isolate closely related to SEN virus-F. Mem. Inst. Oswaldo Cruz [online]. 2004, vol.99, n.3, pp.301-306. ISSN 0074-0276.

SEN virus (SENV) is a circular, single stranded DNA virus that has been first characterized in the serum of a human immunodeficiency virus type 1 (HIV-1)-infected patient. Eight genotypes of SENV (A-H) have been identified and further recognized as variants of TT virus (TTV) in the family Circoviridae. Here we describe the first genomic characterization of a SENV isolate (5-A) from South America. Using 'universal' primers, able to amplify most, if not all, TTV/SENV genotypes, a segment of > 3 kb was amplified by polymerase chain reaction from the serum of an HIV-1 infected patient. The amplicon was cloned and a 3087-nucleotide sequence was determined, that showed a high (85%) homology with the sequence of the Italian isolate SENV-F. Proteins encoded by open reading frames (ORFs) 1 to 4 consisted of 758, 129, 276, and 267 amino acids, respectively. By phylogenetic analysis, isolate 5-A was classified into TTV genotype 19 (phylogenetic group 3), together with SENV-F and TTV isolate SAa-38.

Palavras-chave : hepatitis; human immunodeficiency virus type 1; nucleotide sequencing; open reading frames 1-4; SEN virus-F; TT virus.

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