Factors Associated With the Microbiome in Moderate-Late Preterm Babies: A Cohort Study From the DIAMOND Randomized Controlled TrialOriginal paper
Karen Pendergrass is a microbiome researcher specializing in microbiome-targeted interventions (MBTIs). She systematically analyzes scientific literature to identify microbial patterns, develop hypotheses, and validate interventions. As the founder of the Microbiome Signatures Database, she bridges microbiome research with clinical practice. In 2012, based on her own investigative research, she became the first documented case of FMT for Celiac Disease, four years before the first published case study.
Read MoreWhat was studied?
This cohort study asked how nutrition, the perinatal medical environment, and social factors shape the gut microbiome of moderate-late preterm babies. It drew on infants in the DIAMOND randomized nutrition trial in New Zealand. Stool was collected at day-10 and four-months corrected age. Samples underwent 16S ribosomal RNA amplicon sequencing, with shotgun metagenomics on a subset. Diversity and taxon abundance were linked to socioeconomic status, ethnicity, feeding, hospital, and medication use.
Who was studied?
The study included 227 moderate-late preterm babies born between 32 and 36 weeks gestation across four Auckland hospitals in New Zealand. Mean birth weight was about 2,106 grams. A total of 320 stool samples underwent 16S sequencing; 94 four-month samples had shotgun metagenomics. Roughly 64 percent were delivered by Cesarean section. Rich metadata covered socioeconomic status, maternal ethnicity (including Maori, Pacifica, Asian, European), education, feeding type, and antibiotic or probiotic use.
What were the most important findings?
Babies from lower socioeconomic areas had significantly higher day-10 microbial diversity (Wilcoxon p = 0.021). Babies of mothers self-reporting as Maori also had higher day-10 diversity than those of European mothers (p = 0.04). Breastmilk-fed infants had lower diversity at four months than mixed-fed (p = 0.024) or formula-fed (p = 0.029) babies. Maternal antibiotic (p = 0.013) and probiotic (p = 0.04) use lowered day-10 diversity. Hospital of birth explained 5.2 percent of four-month variance (PERMANOVA p = 0.038). Infant probiotic use was linked to a higher level of a commonly used probiotic taxon at day-10.
What are the greatest implications of this study?
In moderate-late preterm babies, socioeconomic status, maternal ethnicity, hospital environment, and feeding all leave marks on the early gut microbiome. Diet and immediate surroundings dominate by four months. Many day-10 differences faded by four months, suggesting early social and delivery effects are transient. Male and female microbiomes related to growth differently, so the authors urge analyzing sexes separately. The study is observational with confounding between ethnicity, deprivation, and education, so it maps associations rather than proving cause.