Diversity in Indian equine rotaviruses: identification of genotype G10,P6[1] and G1 strains and a new VP7 genotype (G16) strain in specimens from diarrheic foals in India.
Abstract: Rotaviruses causing severe diarrhea in foals in two organized farms in northern India, during the period from 2003 to 2005, were characterized by electropherotyping, serotyping, and sequence analysis of the genes encoding the outer capsid proteins. Of 137 specimens, 47 (34.31%) were positive for rotavirus and exhibited at least five different electropherotypes (E), E1 to E5. Strains belonging to different electropherotypes exhibited either a different serotype/genotype specificity or a lack of reactivity to typing monoclonal antibodies (MAbs) used in this study. Strains belonging to E1, E2, and E5 exhibited genotype G10,P6[1], G3, and G1 specificities and accounted for 19.0, 42.9, and 9.5% of the isolates, respectively. Though they possessed G10-type VP7, the E1 strains exhibited high reactivity with the G6-specific MAb, suggesting that the uncommon combination of the outer capsid proteins altered the specificity of the conformation-dependent antigenic epitopes on VP7. E3 and E4 strains accounted for 28.6% of the isolates and were untypeable. Sequence analysis of VP7 from E4 strains (Erv92 and Erv99) revealed that they represent a new VP7 genotype, G16. The detection of unexpected bovine rotavirus-derived G10,P6[1] reassortants, G1 serotype strains, and a new genotype (G16) strain in two distant farms reveals an interesting epidemiological situation and diversity of equine rotaviruses in India.
Publication Date: 2006-11-29 PubMed ID: 17135436PubMed Central: PMC1829150DOI: 10.1128/JCM.01696-06Google Scholar: Lookup
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Summary
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This research explores the diversity and prevalence of unique and emerging strains of rotavirus in foals in India, identifying G10,P6[1], G1, and a new G16 genotype causing severe diarrhea.
About the Study
- The study focused on investigating rotavirus strains in foals in two organized farms in northern India between 2003 and 2005.
- The researchers targeted rotaviruses that cause severe diarrhea in foals.
- The team characterized the virus strains using electropherotyping, serotyping, and sequence analysis of the genes encoding the outer capsid proteins.
Results and Findings
- Results revealed that 47 out of 137 specimens (34.31%) were positive for rotavirus.
- The positive samples showed at least five distinct electropherotypes, designated E1 to E5, each being different in terms of their serotype/genotype specificity or lack of reactivity to typing monoclonal antibodies (MAbs).
- Strains E1, E2, and E5 exhibited genotypes G10,P6[1], G3, and G1 respectively, and these accounted for 19.0%, 42.9%, and 9.5% of the isolates.
- E1 strains, although possessing G10-type VP7, showed high reactivity with the G6-specific MAb, indicating altered specificity of antigenic epitopes on VP7 due to the unusual combination of the outer capsid proteins.
- The E3 and E4 strains, which accounted for 28.6% of the isolates, were untypeable.
- Further sequence analysis of VP7 from E4 strains led to the discovery of a new VP7 genotype, G16.
- Discovery of unexpected bovine rotavirus-derived G10,P6[1] reassortants, G1 serotype strains, and a new genotype (G16) strain marked new territory in the diversity of equine rotaviruses in India.
Implications
- This study highlights the emergence and prevalence of unique and diverse strains of equine rotavirus in India and the potential impact on equine health.
- The findings signal the complexity of rotavirus epidemiology and the significance of ongoing surveillance for emerging and divergent strains of the virus.
Cite This Article
APA
Gulati BR, Deepa R, Singh BK, Rao CD.
(2006).
Diversity in Indian equine rotaviruses: identification of genotype G10,P6[1] and G1 strains and a new VP7 genotype (G16) strain in specimens from diarrheic foals in India.
J Clin Microbiol, 45(3), 972-978.
https://doi.org/10.1128/JCM.01696-06 Publication
Researcher Affiliations
- National Research Centre on Equines, Sirsa Road, Hisar, Haryana, India.
MeSH Terms
- Amino Acid Sequence
- Animals
- Antigens, Viral / chemistry
- Antigens, Viral / genetics
- Capsid Proteins / chemistry
- Capsid Proteins / genetics
- Cattle
- Diarrhea / epidemiology
- Diarrhea / veterinary
- Diarrhea / virology
- Genotype
- Horse Diseases / epidemiology
- Horse Diseases / virology
- Horses / virology
- Humans
- India / epidemiology
- Molecular Sequence Data
- Rotavirus / classification
- Rotavirus / genetics
- Rotavirus / isolation & purification
- Rotavirus Infections / epidemiology
- Rotavirus Infections / veterinary
- Rotavirus Infections / virology
- Sequence Analysis, DNA
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