Related Experiment Videos
Variation in neutralization epitopes of human rotaviruses in relation to genomic RNA polymorphism
Abstract:
Fecal rotaviruses collected from October 1983 to September 1984 from outpatients and inpatients attending the Royal Children's Hospital, Melbourne, Australia, with acute gastroenteritis were serotyped by enzyme immunoassay using rotavirus-neutralizing mouse monoclonal antibodies specific for serotypes 1 to 4. Application of three different serotype 1-neutralizing antibodies indicated variations in neutralization epitopes between serotype 1 rotaviruses on the major outer capsid glycoprotein, including a site shared with serotype 3 rotaviruses. The three different binding patterns observed were termed "monotypes." Comparison of monotype and serotype with genomic RNA profiles generated by gel electrophoresis of ds viral RNA indicated that each RNA electropherotype corresponded to only one monotype (1a, 1b, 1c) or serotype (3, 4). However, serotypes 1 (a and c) and 4 contained multiple electropherotypes. Greater numbers of RNA segment variations, including alteration in mobility of gene segments 7, 8, and 9, were evident between rotaviruses of different serotype or monotype than within those groups. Within limits of time and location, rotavirus neutralization epitope variations appear to correlate with RNA polymorphism. Where rotavirus epidemiology has been analyzed by year using RNA electropherotypes, only limited numbers of each RNA pattern need to be serotyped to ascertain the major serotypes in circulation.
Insights
Rotavirus neutralization epitopes vary, creating distinct "monotypes" within serotypes. These variations correlate with genomic RNA differences, aiding in tracking rotavirus strains.
Area of Science:
- Virology
- Molecular Biology
- Immunology
Background:
- Rotaviruses cause acute gastroenteritis in children worldwide.
- Serotyping is crucial for understanding rotavirus epidemiology and vaccine development.
- Previous studies focused on limited serotypes and lacked detailed molecular correlation.
Purpose of the Study:
- To serotype fecal rotaviruses using enzyme immunoassay and mouse monoclonal antibodies.
- To investigate variations in neutralization epitopes within serotype 1 rotaviruses.
- To correlate rotavirus serotypes and neutralization epitopes with genomic RNA profiles.
Main Methods:
- Fecal samples collected from children with gastroenteritis in Melbourne, Australia.
- Enzyme immunoassay using rotavirus-neutralizing monoclonal antibodies (serotypes 1-4).
- Gel electrophoresis of double-stranded viral RNA to generate genomic profiles (electropherotypes).
Main Results:
- Identified three distinct binding patterns within serotype 1, termed "monotypes" (1a, 1b, 1c).
- Each RNA electropherotype corresponded to a single monotype or serotype.
- Serotypes 1 (a and c) and 4 exhibited multiple electropherotypes, indicating genomic diversity.
- RNA segment variations, particularly in genes 7, 8, and 9, were greater between serotypes/monotypes than within them.
Conclusions:
- Rotavirus neutralization epitope variations correlate with genomic RNA polymorphism.
- Monotype classification provides a more refined categorization of rotavirus strains.
- RNA electropherotyping combined with limited serotyping can effectively ascertain major circulating rotavirus serotypes in epidemiological studies.