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Related Concept Videos

Single Nucleotide Polymorphisms-SNPs01:05

Single Nucleotide Polymorphisms-SNPs

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A single nucleotide polymorphism or SNP is a single nucleotide variation at a specific genomic position in a large population. It is the most prevalent type of sequence variation found in the human genome. Point mutations that occur in more than 1% of the population qualify as SNPs. These are present once every 1000 nucleotides on an average in the human genome. Replacement of a purine with another purine (A/G) or a pyrimidine with another pyrimidine (C/T) is known as a transition. In contrast,...
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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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Evolutionary Relationships through Genome Comparisons02:54

Evolutionary Relationships through Genome Comparisons

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Genome comparison is one of the excellent ways to interpret the evolutionary relationships between organisms. The basic principle of genome comparison is that if two species share a common feature, it is likely encoded by the DNA sequence conserved between both species. The advent of genome sequencing technologies in the late 20th century enabled scientists to understand the concept of conservation of domains between species and helped them to deduce evolutionary relationships across diverse...
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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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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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Phylogeny01:23

Phylogeny

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Phylogeny is concerned with the evolutionary diversification of organisms or groups of organisms. A group of organisms with a name is called a taxon (singular). Taxa (plural) can span different levels of the evolutionary hierarchy. For instance, the group containing all birds is a taxon (comprising the class Aves), and the group of all species of daisies (the genus Bellis) is a taxon. Phylogenies can likewise include just one genus (i.e., depict species relationships) or span an entire kingdom.
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Human coronaviruses: Clinical features and phylogenetic analysis.

Shih-Wen Li1, Cheng-Wen Lin1

  • 1Department of Medical Laboratory Science and Biotechnology, China Medical University, Taichung, Taiwan.

Biomedicine
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Summary

Human coronaviruses (HCoV) cause common colds but can lead to severe illness in vulnerable groups. This review examines HCoV genome differences, pathogenesis, and potential therapeutic agents for infections.

Keywords:
human betacoronavirus 2c EMC2012human coronavirusphylogenetic treesevere acute respiratory syndrome coronavirus (SARS-CoV)

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Area of Science:

  • Virology
  • Infectious Diseases
  • Respiratory Medicine

Background:

  • Common human coronaviruses (HCoV) like HCoV-OC43, HCoV-229E, HCoV-NL63, and HCoV-HKU1 typically cause mild upper respiratory and gastrointestinal infections.
  • Severe manifestations, including lower respiratory tract infections and febrile seizures, can occur in infants, the elderly, and immunocompromised individuals.
  • Emergence of novel HCoV strains, such as SARS-CoV in 2002 and human betacoronavirus 2c EMC/2012 in 2012, highlights the potential for severe outbreaks.

Purpose of the Study:

  • To review the genomic variations among different human coronavirus strains.
  • To explore the pathogenesis of HCoV infections.
  • To discuss recent advancements in developing therapeutic agents for HCoV infections.

Main Methods:

  • Review of existing literature on human coronavirus genomics, pathogenesis, and therapeutics.
  • Phylogenetic analysis of conserved and non-conserved genes between HCoV strains, specifically human betacoronavirus 2c EMC/2012 and SARS-CoV.
  • Synthesis of current research on therapeutic strategies for HCoV infections.

Main Results:

  • Identification of highly conserved sequences in ORF1ab, spike, nucleocapsid, and envelope protein genes between human betacoronavirus 2c EMC/2012 and SARS-CoV.
  • Demonstration of significant genomic differences, particularly in membrane protein genes, between these strains.
  • Overview of the diverse clinical presentations and pathogenic mechanisms of various HCoV strains.

Conclusions:

  • Understanding HCoV genomic diversity is crucial for comprehending their varied pathogenesis.
  • Continued research into therapeutic agents is essential for managing HCoV infections, especially those caused by novel or severe strains.
  • The review provides insights into the evolutionary relationships and potential treatment avenues for human coronaviruses.