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Related Concept Videos

Taxonomy01:31

Taxonomy

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Taxonomy is the science of defining and naming groups of biological organisms based on shared characteristics. It uses a hierarchy of increasingly inclusive categories with Latin names. The smallest units of taxonomy, species and genus, are used to assign a formal, taxonomic name to each species in a system. This classification system, referred to as binomial nomenclature, was formalized by Carolus Linnaeus in the 18th century.
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Advancements in molecular biology have revolutionized the identification and characterization of bacteria, with multiple methods leveraging DNA sequencing for enhanced precision. As sequencing technologies improve and costs decline, these approaches are increasingly used in clinical, environmental, and evolutionary studies.Multilocus Sequence Typing (MLST) examines several housekeeping genes, essential chromosomal genes encoding cellular functions, to distinguish strains. Approximately...
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Molecular taxonomy has revolutionized the understanding and classification of bacteria, providing precise insights into their diversity, evolutionary relationships, and ecological roles. By utilizing molecular techniques such as DNA sequencing and fingerprinting, researchers have made significant strides in various fields related to bacterial studies.Resolving Taxonomic AmbiguitiesMolecular taxonomy has been instrumental in distinguishing closely related bacterial species initially thought to...
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Nursing Interventions I: Taxonomy of Nursing Interventions01:03

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Nursing interventions are chosen as part of the planning process to achieve patient outcomes. Once nursing diagnoses are determined, the goals and outcomes are specified, then the nursing interventions are selected and individualized according to the patient's situation.
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Ribosome Profiling02:24

Ribosome Profiling

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Ribosome profiling or ribo-sequencing is a deep sequencing technique that produces a snapshot of active translation in a cell. It selectively sequences the mRNAs protected by ribosomes to get an insight into a cell’s translation landscape at any given point in time.
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Plaquing of Herpes Simplex Viruses
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ICTV Virus Taxonomy Profile: Deltavirus.

Lars Magnius1, John Taylor2, William S Mason2

  • 11​Ulf Lundahls Foundation, 10061 Stockholm, Sweden.

The Journal of General Virology
|October 13, 2018
PubMed
Summary

Hepatitis delta virus (HDV) is a unique human pathogen with a small RNA genome encoding a key antigen. HDV relies on hepatitis B virus for its envelope to create infectious particles.

Keywords:
DeltavirusICTV reporthelper virushepatitishepatitis B virushepatitis delta virustaxonomy

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Area of Science:

  • Virology
  • Molecular Biology
  • Pathogen Discovery

Background:

  • Hepatitis delta virus (HDV) is the sole member of the Deltavirus genus, representing a distinct human pathogen.
  • HDV possesses a unique ~1.7 kb circular, negative-sense RNA genome encoding the hepatitis delta antigen (HDAg) in small and large forms.

Purpose of the Study:

  • To summarize the International Committee on Taxonomy of Viruses (ICTV) report on Deltavirus taxonomy.
  • To provide an overview of HDV's genomic structure, replication strategy, and dependence on hepatitis B virus (HBV).

Main Methods:

  • Review of the ICTV Deltavirus Report.
  • Analysis of HDV's genomic and protein characteristics.
  • Description of HDV replication mechanisms and helper virus dependence.

Main Results:

  • HDV utilizes host RNA polymerase II for replication through a double rolling circle mechanism.
  • Newly synthesized linear RNAs undergo autocatalytic cleavage and ligation to form circular genomes.
  • HDV requires the envelope proteins of hepatitis B virus (HBV) to assemble infectious virions.

Conclusions:

  • HDV is a taxonomically unique virus with a complex replication cycle.
  • HDV's reliance on HBV highlights a unique co-infection dependency in virology.
  • Understanding HDV's biology is crucial for its classification and potential therapeutic strategies.