Associations of Maternal Breastmilk MicroRNAs and Infant Obesity Status at 1 Year

Overview

Journal Genes (Basel)

Publisher MDPI

Date 2024 Jun 27

PMID 38927748

Authors

Emily Van Syoc

Molly Stegman

Rhea Sullivan

Alexandra Confair

Kaitlyn Warren

Steven D Hicks

Affiliations

Soon will be listed here.

Abstract

Infant consumption of human milk (HM) is associated with a reduced risk of overweight and obesity, but the reasons for this relationship are not completely understood. There is emerging evidence that micro RNAs (miRNAs) regulate infant development and metabolism, but the associations between HM miRNAs and infant growth remain poorly understood. We examined the relationship between HM miRNA consumption and infant obesity in 163 mother-infant dyads to determine (1) if miRNA profiles differentiate infants with obesity, and (2) if individual miRNAs accurately predicted infant obesity status at one year of age. Infant obesity was categorized as weight-for-length (WFL) Z scores or conditional weight gain (CWG) in the 95th percentile. HM miRNA profile was associated with infant age (r = 6.4%, = 0.001), but not maternal obesity status (r = 1.5%, = 0.87) or infant weight status (WFL Z-score) at birth (r = 0.6%, = 0.4), 1 month (r = 0.5%, = 0.6), or 4 months (r = 0.8%, = 0.2). Nine HM miRNAs were associated with either 12-month CWG or 12-month WFL Z scores. Among these 9 miRNAs, miR-224-5p remained significant in a logistic regression model that accounted for additional demographic factors (estimate = -27.57, = 0.004). These findings suggest involvement of HM miRNAs and particularly miR-224-5p in infant growth, warranting further investigation. To our knowledge, this is the largest study of HM miRNAs and early-life obesity and contributes to the understanding of the relationship between HM miRNAs and infant growth.

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