Higher Promoter Methylation of the Ubiquitin-Associated and SH3 Domain Containing A ( UBASH3A ) Gene Is Associated With T-Lymphocyte Ontogeny and Reduced Susceptibility to Early-Onset Sepsis

We investigated the genetic and epigenetic regulation of the UBASH3A gene and its association with early-onset sepsis. Using matched whole blood DNA methylation, gene expression, genotypes, and immune cell counts from the EPIC-HIPC newborn cohort, we report that promoter methylation was negatively correlated (Pearson r = -0.5, P < 2.2 × 10-16) with ontogenetic changes in UBASH3A gene expression and circulating CD3+ T-cell numbers. Higher promoter methylation at birth was associated with lower UBASH3A expression and reduced early-onset sepsis risk (odds ratio, 0.26; P = .015). Genetic variation significantly influenced variations in baseline UBASH3A methylation (132 cis-meQTL, false discovery rate <0.05).