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Antibody response to the rubella virus structural proteins in infants with the congenital rubella syndrome
Insights
Congenital rubella syndrome (CRS) infants show distinct antibody responses to rubella virus proteins compared to naturally infected adults. Their immune sera primarily target E1 and E2 glycoproteins, differing from adult immunity patterns.
Area of Science:
- Virology
- Immunology
- Pediatrics
Background:
- Congenital rubella syndrome (CRS) results from maternal rubella infection during pregnancy.
- Understanding the immune response in CRS is crucial for diagnosis and management.
- Rubella virus has three structural proteins: E1, E2, and C.
Purpose of the Study:
- To characterize the antibody spectrum against rubella virus structural proteins in infants with CRS.
- To compare the antibody profiles in CRS patients with those of naturally infected adults.
Main Methods:
- Immunoprecipitation assay was used to analyze antibody binding to rubella virus proteins.
- Serum samples from 31 infants with CRS and 25 naturally immune adults were tested.
- Antibody levels and ratios (E1/E2) were quantified and correlated with clinical data.
Main Results:
- Most CRS sera showed low or no E2 protein-specific antibodies; some had higher E2 than E1 antibodies.
- The E1/E2 antibody ratio decreased over time in serial samples from CRS patients.
- CRS sera exhibited different immunoprecipitation patterns compared to naturally immune adults, who recognized all three viral proteins.
- No correlation was found between IgG hemagglutination inhibition titers and the E1/E2 ratio, but high neutralizing antibody titers correlated with E2 immunoprecipitation in some cases.
- CRS sera showed poor reactivity with the C protein.
Conclusions:
- Infants with CRS mount a distinct antibody response to rubella virus structural proteins, primarily targeting E1 and E2 glycoproteins.
- The antibody profile in CRS differs significantly from that observed in adults with natural rubella immunity.
- These findings highlight unique immunological characteristics of congenital rubella syndrome.
Abstract:
Forty-five serum samples from 31 newborns and infants with the congenital rubella syndrome (CRS) were tested by immunoprecipitation to determine their antibody spectra to each of the structural proteins of rubella virus. Most sera (37/45) contained little or no E2 protein-specific antibody, but some (6/45) precipitated a greater amount of the E2 glycoprotein than the E1 glycoprotein. The relative E1/E2 ratio was found to decrease with time when serial serum samples from the same patient were tested. No correlation between the IgG class hemagglutination inhibition antibody titers and the E1/E2 ratio could be demonstrated. However, in some serum specimens relatively high neutralizing antibody titers were correlated with immunoprecipitation of the E2 glycopolypeptide. None of the CRS sera reacted well with the C protein. The immunoprecipitation patterns found in CRS sera were qualitatively different from those observed in a series of 25 sera from young adults with conventional serologic evidence of rubella immunity following natural infection. All of the natural immune sera recognized each of the three structural polypeptides of rubella virus.