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During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA.  Marilyn Kozak discovered that the sequence RCCAUGG (where R...
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Microorganisms play a fundamental role in vaccine development, gene therapy, and therapeutic production. Their biological properties are harnessed to advance medicine and public health. Beyond immunization, microorganisms contribute to gut health, antibiotic synthesis, and genetic disease treatment.Live Attenuated and Inactivated VaccinesLive attenuated vaccines, such as the measles, mumps, and rubella (MMR) vaccine, utilize weakened forms of pathogens to closely resemble natural infections.
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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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Simple proteins and protein complexes contain only amino acids. In contrast, many other proteins, called conjugated proteins, covalently bond with non-protein moieties.
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Before mRNAs are exported to the cytoplasm, it is crucial to check each mRNA for structural and functional integrity. Eukaryotic cells use several different mechanisms, collectively known as mRNA surveillance, to look for irregularities in mRNAs. Irregular or aberrant mRNA are rapidly degraded by various enzymes. If a defective mRNA escapes the surveillance, it would be translated into a protein which would either be non-functional or not function properly. One of the primary irregularities in...
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COVID-19 mRNA vaccines.

Qingrui Huang1, Jiawei Zeng2, Jinghua Yan2

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The COVID-19 pandemic necessitates rapid vaccine development. This review covers keynotes in messenger RNA (mRNA) vaccine development, focusing on clinical trial data for COVID-19 mRNA vaccines and future challenges.

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Area of Science:

  • Vaccinology
  • Molecular Biology
  • Infectious Diseases

Background:

  • The COVID-19 pandemic has caused significant global disruption, emphasizing the need for effective vaccines.
  • Messenger RNA (mRNA) vaccine technology offers rapid development and versatility.
  • Two mRNA vaccines against COVID-19 have shown positive results in late-stage clinical trials.

Purpose of the Study:

  • To review key developments in mRNA vaccine technology.
  • To discuss recent clinical trial data for COVID-19 mRNA vaccine candidates.
  • To analyze potential future challenges in mRNA vaccine development.

Main Methods:

  • Literature review of published data on COVID-19 mRNA vaccines.
  • Focus on vaccine candidates currently in clinical trials.
  • Analysis of the advantages and challenges of mRNA vaccine technology.

Main Results:

  • mRNA vaccines have demonstrated rapid development and positive late-stage clinical trial outcomes for COVID-19.
  • The versatility of mRNA platforms is a key advantage.
  • Several COVID-19 mRNA vaccine candidates are progressing through clinical evaluation.

Conclusions:

  • mRNA technology is a promising platform for rapid vaccine development, as evidenced by COVID-19 candidates.
  • Continued research and development are crucial to address future challenges.
  • mRNA vaccines represent a significant advancement in combating infectious disease outbreaks.