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Related Concept Videos

Retroviruses02:33

Retroviruses

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Retroviruses and retrotransposons both insert copies of their genetic elements into the genome of the host cell. Thus, the viral genes are passed on when the host genome is replicated or translated. A typical retroviral DNA sequence contains 3-4 genes that encode the different proteins required for its structural assembly and function as a molecular parasite. This DNA is transcribed into a single mRNA, which is very similar in structure to conventional mRNAs, i.e., it is capped at the 5’...
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A mutation is a change in the sequence of bases of DNA or RNA in a genome. Some mutations occur during replication of the genome due to errors made by the polymerase enzymes that replicate DNA or RNA. Unlike DNA polymerase, RNA polymerase is prone to errors because it is not capable of “proofreading” its work. Viruses with RNA-based genomes, like HIV, therefore accrue mutations faster than viruses with DNA-based genomes. Because mutation and recombination provide the raw material...
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History of Microbiology

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Microbiology, a scientific field dedicated to the study of microorganisms, has undergone profound development since its inception in the 17th century. Its history is marked by key discoveries and technological advancements that have shaped our understanding of life at the microscopic level and transformed medicine, agriculture, and industry.Early Foundations of MicrobiologyThe early foundations of microbiology were built on groundbreaking observations and the development of pioneering...
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RNA viruses are categorized into positive-strand, negative-strand, or double-stranded groups based on their genomic structure and replication mechanisms. This classification dictates how they exploit host cellular machinery for protein synthesis and replication. Some RNA viruses also utilize reverse transcription as part of their life cycle, further diversifying their replication strategies.Positive-Strand RNA VirusesPositive-strand RNA viruses have genomes that function directly as messenger...
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Retroviruses have a single-stranded RNA genome that undergoes a special form of replication. Once the retrovirus has entered the host cell, an enzyme called reverse transcriptase synthesizes double-stranded DNA from the retroviral RNA genome. This DNA copy of the genome is then integrated into the host’s genome inside the nucleus via an enzyme called integrase. Consequently, the retroviral genome is transcribed into RNA whenever the host’s genome is transcribed, allowing the...
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Assays for the Identification of Novel Antivirals against Bluetongue Virus
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Historical Perspectives on Flavivirus Research.

Michael R Holbrook1

  • 1NIAID Integrated Research Facility, 8200 Research Plaza, Ft. Detrick, Frederick, MD 21702, USA. Michael.holbrook@nih.gov.

Viruses
|May 5, 2017
PubMed
Summary

Flaviviruses, transmitted by mosquitoes and ticks, cause significant global human diseases like West Nile and Zika. Despite long recognition, much remains unknown about these arboviruses and their medical countermeasures.

Keywords:
Japanese encephalitisWest NileZikadengueflavivirustick-borne encephalitisyellow fever

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Area of Science:

  • Virology
  • Epidemiology
  • Public Health

Background:

  • Flaviviruses are single-stranded RNA viruses transmitted by arthropod vectors, commonly known as arboviruses.
  • These viruses are globally distributed and responsible for a substantial burden of human illness, ranging from mild symptoms to severe hemorrhagic fevers and encephalitis.

Observation:

  • Emerging flaviviruses, such as West Nile virus and Zika virus, have heightened public and scientific awareness of mosquito-borne viral threats.
  • While some flavivirus diseases have been known for centuries, recent outbreaks underscore significant knowledge gaps in flavivirus biology.

Findings:

  • This review provides an overview and historical context of key flaviviruses causing significant human disease.
  • It also discusses current medical countermeasures and highlights critical areas where understanding of flavivirus biology is lacking.

Implications:

  • Understanding flavivirus transmission, pathogenesis, and host-vector interactions is crucial for developing effective interventions.
  • Addressing knowledge gaps is essential for mitigating the impact of current and future flavivirus epidemics and pandemics.