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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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Viruses are extraordinarily diverse in shape and size, but they all have several structural features in common. All viruses have a core that contains a DNA- or RNA-based genome. The core is surrounded by a protective coat of proteins called the capsid. The capsid is composed of subunits called capsomeres. The capsid and genome-containing core are together known as the nucleocapsid.
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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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Bacteriophages, or phages, are viruses that specifically infect bacteria, utilizing their genetic material to hijack host cellular machinery for replication. DNA bacteriophages employ single-stranded DNA (ssDNA) or double-stranded DNA (dsDNA) genomes. These phages exhibit diverse replication strategies and host interactions, influencing their ecological roles and applications in biotechnology and medicine.ssDNA BacteriophagesssDNA phages, with their small genomes, utilize unique strategies to...
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Viral Replication: Lytic Cycle01:20

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Bacteriophages, or phages, are viruses that specifically infect bacteria. Among them, T-even bacteriophages, such as T4, exhibit a well-characterized lytic replication cycle in Escherichia coli (E. coli). This process ensures the rapid proliferation of the virus while ultimately leading to the destruction of the bacterial host.Attachment and DNA InjectionThe infection process begins with the recognition and binding of the T4 phage to the E. coli cell surface. Tail fibers of the phage...
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Bacteriophages, also known as phages, are specialized viruses that infect bacteria. A key characteristic of phages is their distinctive “head-tail” morphology. A phage begins the infection process (i.e., lytic cycle) by attaching to the outside of a bacterial cell. Attachment is accomplished via proteins in the phage tail that bind to specific receptor proteins on the outer surface of the bacterium. The tail injects the phage’s DNA genome into the bacterial cytoplasm. In the...
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A Quantitative Dot Blot Assay for AAV Titration and Its Use for Functional Assessment of the Adeno-associated Virus Assembly-activating Proteins
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Alphavirus Virulence Determinants.

Margarita V Rangel1, Kenneth A Stapleford1

  • 1Department of Microbiology, New York University Grossman School of Medicine, New York, NY 10016, USA.

Pathogens (Basel, Switzerland)
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PubMed
Summary
This summary is machine-generated.

Alphaviruses cause widespread disease, but no treatments exist. This review details genetic factors influencing alphavirus (alphavirus) infection, crucial for developing new therapies and vaccines.

Keywords:
alphaviruspathogenesistransmissionvirulence factors

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Area of Science:

  • Virology
  • Molecular Biology
  • Immunology

Background:

  • Alphaviruses are significant global pathogens causing diverse diseases in humans and animals.
  • Alphavirus infections range from acute febrile illnesses to severe conditions like encephalitis and myocarditis.
  • Current therapeutic and vaccine options against alphaviruses are lacking, posing a substantial public health challenge.

Purpose of the Study:

  • To review and summarize known genetic determinants of alphavirus virulence.
  • To highlight molecular factors influencing disease development, immune response, and virus transmission.
  • To provide a foundation for developing novel antiviral strategies and vaccines.

Main Methods:

  • Literature review of published research on alphavirus genetic determinants.
  • Analysis of studies identifying genomic RNA elements, protein residues, and domains involved in alphavirus pathogenesis.
  • Synthesis of information on how these determinants impact viral infection dynamics.

Main Results:

  • Identified various genetic determinants, including RNA elements and protein features, that significantly impact alphavirus virulence.
  • Described the roles of these determinants in disease progression, host immune response modulation, and viral transmissibility.
  • Compiled a comprehensive overview of current knowledge on molecular determinants of alphavirus infection.

Conclusions:

  • Understanding alphavirus genetic determinants is essential for combating these pathogens.
  • Knowledge of molecular factors can guide the development of targeted antiviral therapies.
  • Further research into these determinants will facilitate the creation of effective alphavirus vaccines.