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Single Nucleotide Polymorphisms-SNPs01:05

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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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Rous Sarcoma virus or RSV was discovered by F. Peyton Rous in the year 1911 as a filterable transmissible agent that could cause tumors in chickens. He won a Nobel Prize for this discovery in 1966. His experiments clearly demonstrated that some cancers could be caused by infectious agents and led to the discovery of many more cancer-causing viruses in animals as well as humans.
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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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Subviral agents are infectious entities that resemble viruses but lack one or more viral components, such as a capsid or essential replication machinery. These agents include viroids, prions, and satellites, each possessing distinct structural and functional characteristics that influence their mode of infection and replication.Viroids are the simplest subviral agents, consisting of circular, single-stranded RNA molecules without a protein coat. They exclusively infect plants, relying entirely...
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Related Experiment Video

Updated: Sep 23, 2025

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SARS-CoV-2 Omicron (B.1.1.529) Variant: No Time to Wait!

Shayan Rahmani1, Nima Rezaei2

  • 1Student Research Committee, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran. shayanrahmani1997@yahoo.com.

Acta Bio-Medica : Atenei Parmensis
|May 12, 2022
PubMed
Summary

The Omicron variant (B.1.1.529) of SARS-CoV-2 was identified as a variant of concern, prompting global health alerts. Its numerous mutations necessitate understanding its spread, pathogenicity, and immune evasion to control the COVID-19 pandemic.

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Area of Science:

  • Virology
  • Epidemiology
  • Public Health

Background:

  • A new severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) variant, B.1.1.529 (Omicron), was designated a variant of concern (VOC) by the WHO on November 26th.
  • Omicron's emergence triggered international concern due to its extensive mutations, potentially impacting transmissibility, disease severity, and immune escape.

Purpose of the Study:

  • To analyze the emergence and characteristics of the Omicron variant (B.1.1.529).
  • To assess the potential impact of Omicron on the ongoing COVID-19 pandemic.
  • To inform national and international strategies for controlling the spread of SARS-CoV-2.

Main Methods:

  • Review of WHO designations and scientific literature.
  • Analysis of mutation profiles of SARS-CoV-2 variants.
  • Epidemiological surveillance data interpretation.

Main Results:

  • The Omicron variant possesses a significant number of mutations compared to previous SARS-CoV-2 strains.
  • These mutations may confer advantages in terms of transmission and immune evasion.
  • The full extent of Omicron's impact on disease severity and vaccine effectiveness requires further investigation.

Conclusions:

  • The Omicron variant represents a significant development in the COVID-19 pandemic.
  • Urgent research and enhanced surveillance are crucial to understand and mitigate Omicron's threat.
  • Coordinated global and national responses are essential for effective pandemic control.