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Related Concept Videos

Cytomegalovirus Disease01:27

Cytomegalovirus Disease

59
Cytomegalovirus (CMV) disease is caused by human cytomegalovirus, a double-stranded DNA virus of the Herpesviridae family. While primary CMV infection is often asymptomatic in immunocompetent individuals, the virus can cause severe disease in neonates and immunocompromised patients. CMV is the most common cause of congenital viral infection in the United States, and a major pathogen in solid organ and hematopoietic stem cell transplant recipients.CMV is transmitted via bodily fluids, sexual...
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Hepatitis01:25

Hepatitis

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Hepatitis is an inflammatory condition of the liver most commonly caused by hepatotropic viruses (A–E), though non-infectious causes such as alcohol and drugs also exist.Hepatitis AHepatitis A virus (HAV) is a non-enveloped RNA virus of the Picornaviridae family. It is primarily transmitted via the fecal-oral route, typically through ingestion of contaminated food or water. After ingestion, HAV enters the bloodstream through the oropharynx or intestinal epithelium and reaches the liver.
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Human cytomegalovirus: taking the strain.

Gavin W G Wilkinson1, Andrew J Davison, Peter Tomasec

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Research on human cytomegalovirus (HCMV) strains AD169 and Towne is limited by genetic compromises. Developing new HCMV treatments requires studying wild-type strains and their natural genetic diversity.

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Area of Science:

  • Virology
  • Genetics
  • Molecular Biology

Background:

  • Human cytomegalovirus (HCMV) research heavily relies on high-passage strains like AD169 and Towne.
  • These strains have compromised genetic integrity, limiting their utility for developing new HCMV treatments.
  • Wild-type HCMV strains are difficult to propagate in vitro, and mutations arise during isolation.

Purpose of the Study:

  • To evaluate the limitations of commonly used HCMV strains.
  • To explore methods for studying wild-type HCMV and its natural genetic variation.
  • To develop tools for research into HCMV treatments.

Main Methods:

  • Cloning the HCMV Merlin strain genome as a bacterial artificial chromosome (BAC).
  • Repairing the Merlin BAC to match the original clinical viral sequence.
  • Analyzing the effects of restoring specific genes (UL128L, RL13) on viral growth.
  • Characterizing the Merlin transcriptome and proteome.
  • Considering high-throughput whole-genome sequencing for strain variation analysis.

Main Results:

  • Restoring UL128L to wild type impaired fibroblast growth; restoring RL13 affected growth in all tested cell types.
  • Conditional expression of both regions was necessary for stable propagation of phenotypically wild-type virus.
  • The Merlin strain's transcriptome and proteome were characterized in detail.
  • High interstrain variation exists in circulating wild-type HCMV.

Conclusions:

  • Genetically compromised HCMV strains limit research and treatment development.
  • Bacterial artificial chromosome (BAC) technology enables the creation of stable, genetically defined HCMV strains.
  • Studying natural variation in wild-type HCMV requires new systems, such as BAC clones of diverse clinical strains.
  • Further research is needed to understand the biological and clinical significance of natural HCMV diversity.