Gene Expression Factors Associated with Rubella-Specific Humoral Immunity After a Third MMR Vaccine Dose

Area of Science:

• Immunology
• Vaccinology
• Molecular Biology

Background:

• Rubella infection during pregnancy can cause severe fetal complications, including congenital rubella syndrome.
• Maintaining protective immunity in women of childbearing age is critical to prevent rubella-related adverse pregnancy outcomes.
• The Measles, Mumps, and Rubella (MMR) vaccine is essential for rubella prevention.

Purpose of the Study:

• To identify transcriptional factors and gene expression signatures associated with rubella-specific immune responses after a third MMR vaccine dose.
• To explore potential biomarkers for assessing rubella immunity in women of reproductive age.

Main Methods:

• Analysis of gene expression profiles (transcriptional factors) in women of reproductive age before and after a third MMR vaccination.
• Assessment of rubella-specific immune outcomes including IgG binding antibody and avidity, neutralizing antibody, and memory B cell ELISpot response.
• Identification of differentially expressed genes and enriched KEGG pathways related to immune responses.

Main Results:

• Identified baseline and differentially expressed genes associated with rubella-specific immune outcomes.
• The transferrin receptor 2 (TFR2) gene was identified as a key factor regulating iron homeostasis and macrophage activity, linked to immune responses.
• Enriched KEGG pathways included "cell adhesion molecules", "antigen processing and presentation", "natural killer cell-mediated cytotoxicity", and "immune network for IgA production".

Conclusions:

• Novel insights into the molecular mechanisms underlying rubella-specific immunity following vaccination in women of childbearing age.
• Identification of potential biomarkers, including TFR2 and specific immune pathways, for rubella-specific immunity.
• Findings support strategies for enhancing and monitoring rubella immunity in women of reproductive age.