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MicroRNAs01:22

MicroRNAs

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MicroRNA (miRNA) are short, regulatory RNA transcribed from introns (non-coding regions of a gene) or intergenic regions (stretches of DNA present between genes). Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself, forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After the pre-miRNA...
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Zika Virus Infectious Cell Culture System and the In Vitro Prophylactic Effect of Interferons
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Strain Variation Can Significantly Modulate the miRNA Response to Zika Virus Infection.

Suwipa Ramphan1, Chanida Chumchanchira2, Wannapa Sornjai1

  • 1Institute of Molecular Biosciences, Mahidol University, Nakhon Pathom 73170, Thailand.

International Journal of Molecular Sciences
|November 25, 2023
PubMed
Summary
This summary is machine-generated.

Zika virus (ZIKV) infection alters host cell microRNA (miRNA) profiles, impacting antiviral defenses. Strain-specific miRNA responses highlight the need to consider viral variations in ZIKV research.

Keywords:
HSP70ZIKVheat shock protein 70 kDamiR-34amiRNAmicroRNA

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Area of Science:

  • Virology
  • Molecular Biology
  • Immunology

Background:

  • Zika virus (ZIKV) poses a significant public health threat, linked to neurological disorders.
  • ZIKV infection alters host cell microRNA (miRNA) expression, influencing viral replication.
  • Understanding miRNA roles in ZIKV infection is crucial for developing therapeutic strategies.

Purpose of the Study:

  • To investigate the impact of ZIKV infection on miRNA expression in human A549 cells.
  • To determine the antiviral roles of specific miRNAs against ZIKV.
  • To explore strain-specific differences in miRNA-mediated ZIKV response.

Main Methods:

  • Infection of human A549 cells with two distinct ZIKV isolates.
  • Quantification of 22 miRNA expression levels at various time points.
  • Manipulation of miRNA expression using anti-miRNA oligonucleotides and miRNA mimics.
  • Analysis of mRNA and protein targets (HSP70) for miR-34a and miR-128.

Main Results:

  • Significant changes in the expression of 22 miRNAs were observed post-ZIKV infection.
  • 18 miRNAs showed distinct expression patterns between the two ZIKV strains.
  • Four key miRNAs (miR-21, miR-34a, miR-128, miR-155) demonstrated antiviral activity.
  • HSP70 was identified as a strain-specific target of miR-34a.

Conclusions:

  • Host miRNA profiles are significantly altered by ZIKV infection in a strain-dependent manner.
  • Specific miRNAs play a critical role in modulating antiviral responses to ZIKV.
  • Viral strain variation must be considered when studying miRNA roles in ZIKV and other viral infections.