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Related Experiment Videos

Torque teno virus (TTV): current status.

Shigeo Hino1, Hironori Miyata

  • 1Department of Virology, Faculty of Medicine, Tottori University, Nishi, Yonago, Japan. hino@grape.med.tottori-u.ac.jp

Reviews in Medical Virology
|December 6, 2006
PubMed
Summary
This summary is machine-generated.

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Torque teno virus (TTV) and Torque teno mini virus (TTMV) exhibit extensive genetic diversity and are found globally in humans and animals. Their replication and pathogenicity remain largely uncharacterized, necessitating further research.

Area of Science:

  • Virology
  • Molecular Biology
  • Genetics

Background:

  • Torque teno virus (TTV), a member of the Circoviridae family, genus Anellovirus, is known for its extensive genetic diversity.
  • TTV and Torque teno mini virus (TTMV) possess circular single-stranded DNA genomes of varying sizes, with frequent recombination events observed among variants.
  • Despite widespread global prevalence (>90% in adults), TTV's pathogenicity and replication mechanisms are not fully understood, and a definitive culture system is lacking.

Purpose of the Study:

  • To review the current understanding of Torque teno virus (TTV) and Torque teno mini virus (TTMV) diversity, replication, and potential pathogenicity.
  • To highlight the unexplained genetic variation and the need for standardized epidemiological surveys and culture systems.
  • To discuss observed associations with certain diseases and TTV/TTMV presence in various animal species.

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Main Methods:

  • Literature review and synthesis of existing research on TTV and TTMV.
  • Analysis of genomic data regarding TTV and TTMV size and variant diversity.
  • Review of experimental infection studies and observations of viral load in different clinical conditions.

Main Results:

  • TTV and TTMV exhibit remarkable genetic diversity with multiple groups and frequent recombination.
  • High prevalence in humans and presence in diverse animal species, including primates, livestock, and birds.
  • Potential associations with idiopathic inflammatory myopathies, cancer, lupus, and acute respiratory diseases in infants, with higher viral loads observed.

Conclusions:

  • The extensive genetic diversity of TTV/TTMV remains unexplained, posing challenges for research and diagnostics.
  • Further research is needed to elucidate TTV/TTMV replication, pathogenicity, and host interactions.
  • Standardized methodologies are crucial for future epidemiological studies and clinical investigations involving TTV variants.