DNA Methylation, Inflammation, and Neurobehavior in Preterm Infants.

Objectives: Inflammation contributes to disparate neurodevelopmental outcomes between preterm and term-born infants. In this context, DNA methylation may contribute to inflammation by affecting gene expression. Brain-derived neurotrophic factor (BDNF) and nuclear factor-kappa-B-inhibitor alpha (NFKBIA) are important genes for targeted DNA methylation analysis. The aims of this study were to (1) identify associations between inflammatory factors and BDNF and NFKBIA methylation, and (2) identify associations between BDNF and NFKBIA methylation and early neurobehavior in preterm infants. Methods: In a longitudinal cohort study of preterm infants born 28-31 weeks gestational age, blood samples were collected weekly for the quantification of inflammatory factors. We extracted DNA from saliva samples and quantified methylation of six BDNF cytosine-phosphate-guanine (CpG) sites and five NFKBIA CpG sites. Neurobehavior was assessed using the Neurobehavioral Assessment of the Preterm Infant. Results: Sixty-five infants were included in the analysis. In females, inflammatory factors were positively associated with BDNF methylation of most CpG sites. Interleukin-1 receptor antagonist was negatively associated with NFKBIA methylation at two CpG sites. In males, interleukin-6 was negatively associated with BDNF and NFKBIA methylation at most CpG sites. In females, BDNF methylation at two sites was inversely associated with motor performance. In males, NFKBIA methylation at one site was inversely associated with motor performance. Conclusion: This study provides evidence for the relationship between inflammation and neurobehavior in preterm infants, working mechanistically through DNA methylation. The finding of a difference between males and females suggests that female infants are potentially more vulnerable to inflammation and warrants future study.

Barriers and Facilitators of Parent Presence in the Neonatal Intensive Care Unit.

PURPOSE: The purpose of this study was to describe system-level and personal factors influencing parent presence in the neonatal intensive care unit (NICU) and identify differences in factors by sociodemographic characteristics. STUDY DESIGN AND METHODS: In a cross-sectional national survey study using social media recruitment, participants rated the frequency of 13 potential barriers and 12 potential facilitators using a 5-point Likert scale. Experiences of discrimination and parent-staff engagement were also measured. RESULTS: Valid responses were analyzed from 152 participants. Uncomfortable facilities and home responsibilities were the most highly reported system-level and personal barriers, respectively. Encouragement to participate in caregiving and social support were the most highly reported system-level and personal facilitators, respectively. Participants reported low to moderate levels of discrimination and moderate levels of parent-staff engagement. Latent class analysis revealed three sociodemographic clusters. Differences in barriers, facilitators, discrimination, and engagement were found among clusters. CLINICAL IMPLICATIONS: NICU facilities are uncomfortable and may discourage parent presence. Allowing support persons to accompany parents, providing comfortable facilities, and engaging parents in caregiving may promote greater parent presence and improved parent and child outcomes. Studies of potential bias toward parents with lower education and income and effects on parent presence and infant outcomes are needed.