[SSPE virus and pathogenesis]

Hak Hotta1, Da-Peng Jiang, Motoko Nagano-Fujii

  • 1Division of Microbiology, Kobe University Graduate School of Medicine.

Insights

Subacute sclerosing panencephalitis (SSPE) is a rare neurological condition caused by measles virus mutants. These mutants exhibit unique genetic changes and protein alterations, leading to persistent, neurotoxic infections.

Area of Science:

  • Virology
  • Neuroscience
  • Genetics

Context:

  • Subacute sclerosing panencephalitis (SSPE) is a severe, progressive neurological disease.
  • It is a rare but fatal complication of measles virus infection.
  • SSPE typically manifests years after the initial measles illness.

Purpose:

  • To elucidate the genetic and molecular characteristics of the measles virus mutants responsible for SSPE.
  • To understand the mechanisms underlying the neuropathogenicity and long-term persistence of the SSPE virus.
  • To explore the viral factors contributing to the unique features of SSPE.

Summary:

  • Subacute sclerosing panencephalitis (SSPE) is caused by specific measles virus mutants, termed SSPE virus.
  • SSPE virus is characterized by defective particle production, neurotoxicity, and prolonged in vivo persistence.
  • Key viral features include biased hypermutation in the M, F, and H genes, resulting in mutated M, F, and H proteins.

Impact:

  • This research provides critical insights into the pathogenesis of SSPE.
  • Understanding these viral mutants may pave the way for novel therapeutic strategies.
  • The findings contribute to the broader knowledge of persistent viral infections and their neurological consequences.

Related Concept Videos

Encephalitis ll: Pathophysiology01:26

Encephalitis ll: Pathophysiology

Encephalitis is inflammation of the brain parenchyma caused by direct viral invasion or immune-mediated mechanisms triggered by infections or tumors. Both processes lead to neuronal injury, disrupted neurotransmission, and diverse neurological symptoms, often with overlapping clinical and pathological features.Autoimmune EncephalitisIn autoimmune encephalitis, antibodies target neuronal antigens on cell surfaces, synapses, or within neurons. A key example is anti-NMDAR encephalitis, which can...
Bacterial Meningitis II: Pathophysiology01:26

Bacterial Meningitis II: Pathophysiology

Bacterial meningitis typically begins when pathogens such as Neisseria meningitidis and Streptococcus pneumoniae colonize the nasopharynx and invade the bloodstream. This process is facilitated by bacterial virulence factors, such as polysaccharide capsules, which resist phagocytosis and complement-mediated killing. Less commonly, bacteria reach the central nervous system via contiguous spread from infections like otitis media or sinusitis, through congenital or acquired dural defects, or...
Subviral Agents01:29

Subviral Agents

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...
Infection01:20

Infection

When a pathogen enters the body and reproduces, it can cause an infection, damage body cells, and cause illness symptoms that eventually lead to disease. Therefore, its prevention requires breaking the chain of infection.
The chain begins with pathogens: bacteria, viruses, fungi, prions, or parasites such as protozoa helminths. These can be present on the skin as transient or resident flora, or they can be acquired from the environment. Identifying and treating the type of infection and...
Respiratory Syncytial Virus Disease01:29

Respiratory Syncytial Virus Disease

Human respiratory syncytial virus (RSV) is a widespread pathogen that primarily targets infants and young children but also poses a serious health risk to elderly and immunocompromised individuals. Belonging to the Pneumoviridae family, RSV is a negative-sense, single-stranded RNA virus within the Pneumovirus genus. Its global health burden is significant, with millions of cases annually resulting in hospitalizations and mortality, particularly in resource-limited settings. Although most...
Fungal Phylum Microsporidia01:28

Fungal Phylum Microsporidia

Microsporidia are a group of obligate intracellular fungi that were initially classified as protists but were later reclassified based on phylogenetic, molecular, and structural evidence linking them to the Chytridiomycota. These unicellular, non-motile organisms are highly specialized parasites that infect a wide range of animal hosts, including humans. They have evolved extensive genomic and metabolic reductions, making them highly dependent on their hosts for survival.Morphology and Genomic...