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Related Concept Videos

Viruses with RNA Genomes01:29

Viruses with RNA Genomes

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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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Viral Mutations00:36

Viral Mutations

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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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Overview of Cell Death01:30

Overview of Cell Death

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Cell death is an essential process where the body gets rid of old or damaged cells. Cell proliferation and death need to be balanced, as an imbalance between the two may lead to cancer or autoimmune diseases.
Cell death was observed in the early 19th century, but there was no experimental evidence to prove it. In 1842, Carl Vogt first discovered cell death in a metamorphic toad; however, it was not termed ‘cell death.’ Scientists discovered different cell death pathways only in the...
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Viral Recombination00:57

Viral Recombination

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Cells are sometimes infected by more than one virus at once. When two viruses disassemble to expose their genomes for replication in the same cell, similar regions of their genomes can pair together and exchange sequences in a process called recombination. Alternatively, viruses with segmented genomes can swap segments in a process called reassortment.
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Introduction to Virus01:28

Introduction to Virus

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Viruses are unique biological entities that blur the boundary between living and non-living systems. Although they lack cellular structure and metabolic processes, they can exhibit characteristics of life when infecting a host. Their defining feature is a nucleic acid core, composed of either DNA or RNA, encapsulated within a protein coat called a capsid. This simple structure allows them to invade host cells and use their machinery for replication efficiently.Viral Structure and...
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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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Updated: Dec 18, 2025

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Overview of lethal human coronaviruses.

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Coronaviruses like SARS-CoV, MERS-CoV, and SARS-CoV-2 cause severe respiratory illness. Understanding virus-host interactions and developing targeted therapies are crucial for preventing future pandemics.

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Area of Science:

  • Virology
  • Infectious Diseases
  • Public Health

Background:

  • Seven human coronaviruses identified, including SARS-CoV, MERS-CoV, and SARS-CoV-2.
  • Recent outbreaks of SARS-CoV, MERS-CoV, and the ongoing COVID-19 pandemic highlight the threat of coronaviruses.
  • Limited specific therapeutic treatments exist for coronavirus infections.

Purpose of the Study:

  • To review recent studies on SARS-CoV, MERS-CoV, and SARS-CoV-2.
  • To focus on virus-host interactions, therapeutic strategies, and diagnostic advancements.
  • To provide insights into minimizing the impact of viral pandemics.

Main Methods:

  • Literature review of recent studies.
  • Focus on summarizing research on virus-host interactions.
  • Analysis of vaccine-based and drug-targeted therapies.

Main Results:

  • Coronaviruses exhibit genetic diversity, posing challenges for treatment development.
  • Understanding pathogenic mechanisms is key to controlling viral spread.
  • Advancements in clinical diagnosis and treatment are under development.

Conclusions:

  • Further research into virus-host interactions is essential.
  • Development of specific antiviral therapies and vaccines is critical.
  • Enhanced diagnostic and treatment strategies are needed to combat coronavirus pandemics.