Opportunities to Improve Access to and Retention in the Child and Adult Care Food Program: Key Recommendations From Early Childcare Providers in Illinois, December 2020-July 2021.

To identify recommendations to improve access to and retention in the Child and Adult Care Food Program (CACFP) as critical strategies to address health equity for low-income children. We conducted a qualitative key informant study of early childcare center and home providers (n = 35) in low-income urban and rural census tracts in Illinois between December 2020 and July 2021. Interviews with providers were organized and analyzed by the study team in MAXQDA Qualitative Data Analysis software.

Tet2 deletion in CD4+ T cells disrupts Th1 lineage commitment in memory cells and enhances T follicular helper cell recall responses to viral rechallenge.

Following viral clearance, antigen-specific CD4+ T cells contract and form a pool of distinct Th1 and Tfh memory cells that possess unique epigenetic programs, allowing them to rapidly recall their specific effector functions upon rechallenge. DNA methylation programing mediated by the methylcytosine dioxygenase Tet2 contributes to balancing Th1 and Tfh cell differentiation during acute viral infection; however, the role of Tet2 in CD4+ T cell memory formation and recall is unclear. Using adoptive transfer models of antigen-specific wild type and knockout CD4+ T cells, we find that Tet2 is required for full commitment of CD4+ T cells to the Th1 lineage and that in the absence of Tet2, memory cells preferentially recall a Tfh like phenotype with enhanced expansion upon secondary challenge.

Tet2 coordinates with Foxo1 and Runx1 to balance T follicular helper cell and T helper 1 cell differentiation.

In response to various types of infection, naïve CD4 T cells differentiate into diverse helper T cell subsets; however, the epigenetic programs that regulate differentiation in response to viral infection remain poorly understood. Demethylation of CpG dinucleotides by Tet methylcytosine dioxygenases is a key component of epigenetic programing that promotes specific gene expression, cellular differentiation, and function. We report that following viral infection, Tet2-deficient CD4 T cells preferentially differentiate into highly functional germinal center T follicular helper (T) cells that provide enhanced help for B cells.