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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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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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Viruses of Archaea01:29

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Archaeal viruses play a crucial role in the ecosystems of extremophilic archaea, particularly those belonging to the phyla Euryarchaeota and Crenarchaeota. By shaping host evolution and facilitating gene transfer, these viruses influence microbial communities and contribute to genetic diversity in extreme environments. The archaea they infect thrive in acidic hot springs and hydrothermal vents characterized by high temperatures and low pH. Archaeal viruses exhibit remarkable structural...
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Size and Structure of Viral Genomes01:26

Size and Structure of Viral Genomes

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Viral genomes exhibit remarkable diversity in size, structure, and composition, influencing their replication strategies and interactions with host cells. These genomes consist of either DNA or RNA and may be linear or circular. Additionally, they can be single-stranded or double-stranded, with each configuration affecting how the virus propagates within a host. RNA viruses, for instance, generally have smaller genomes than DNA viruses, a factor that contributes to their high mutation rates and...
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What are Viruses?00:50

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Retroviruses02:33

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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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Coronaviridae-Old friends, new enemy!

Jair Carneiro Leao1, Teresa Paula de Lima Gusmao2, Adriana Machado Zarzar1

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Coronaviruses have evolved over 60 years, causing mild to severe respiratory illnesses. Understanding coronavirus history and zoonotic risks is crucial for preventing future pandemics, necessitating measures like banning wild animal trade.

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Area of Science:

  • Virology
  • Epidemiology
  • Public Health

Background:

  • Coronaviridae are single-stranded positive-enveloped RNA viruses.
  • Coronaviruses have caused significant human health issues, including epidemics and the current global pandemic.
  • Understanding the history and evolution of coronaviruses is essential for pandemic preparedness.

Purpose of the Study:

  • To review the history of Coronaviridae over the past 60 years.
  • To identify lessons learned from past coronavirus outbreaks.
  • To inform strategies for preventing future zoonotic infections.

Main Methods:

  • A comprehensive review of the PubMed database was conducted.
  • The review focused on taxonomy, classification, virology, genetic recombination, host adaptation, and symptoms.
  • Data from the last 60 years of coronavirus research were analyzed.

Main Results:

  • Coronaviruses include strains causing mild respiratory infections (229-E, OC43, NL63, HKU1) and severe diseases (SARS-CoV, MERS-CoV, SARS-CoV-2).
  • SARS-CoV-2 is responsible for the ongoing global pandemic.
  • Coronaviruses exhibit significant diversity in wildlife, with continuous evolution and host adaptation.

Conclusions:

  • Future outbreaks are inevitable due to the diversity and evolution of coronaviruses.
  • Restricting or banning wild animal trade in wet markets is a necessary measure to reduce zoonotic infections.
  • Lessons from past coronavirus history are vital for mitigating future pandemic risks.