Temporal dynamics of gut microbiota and virome in preterm infants: insights from longitudinal metagenomic analysis.

Staphylococcus epidermidis exhibited a significant decline in relative abundance between 14 and 28 days post-birth in preterm infants.

• Study employed metagenomic shotgun sequencing to characterize bacterial communities longitudinally.
• 12 preterm neonates were sampled at two time points: 14 and 28 days post-birth.
• The decline was described as statistically significant between the two time points.
• S. epidermidis was identified as one of the key bacterial species showing dynamic colonization patterns.

Enterococcus faecalis and its associated bacteriophages showed progressive enrichment, becoming predominant by day 28 in preterm infants.

• Both bacterial and virome (bacteriophage) components associated with E. faecalis increased over the study period.
• E. faecalis became the predominant organism by day 28 post-birth.
• Co-occurrence network analysis was used to characterize the relationship between E. faecalis and its associated bacteriophages.
• The enrichment of E. faecalis may indicate its opportunistic colonization potential in the preterm gut.

The relative abundances of Clostridioides difficile and Klebsiella pneumoniae remained statistically stable between 14 and 28 days post-birth.

• Both C. difficile and K. pneumoniae showed no statistically significant change between the two time points.
• This stability contrasted with the dynamic changes observed for S. epidermidis and E. faecalis.
• These pathogens were identified through metagenomic shotgun sequencing across 12 preterm neonates.
• Findings suggest that not all potentially pathogenic species undergo the same temporal colonization dynamics in preterm guts.

Co-occurrence network analysis identified key bacterial species and bacteriophages associated with clinical parameters in preterm neonates.

• Metagenomic shotgun sequencing combined with co-occurrence network analysis was the primary methodological approach.
• The study characterized both the virome and bacterial communities simultaneously.
• 12 preterm neonates were sampled longitudinally at 14 and 28 days post-birth.
• The approach enabled identification of dynamic microbial colonization patterns linked to clinical variables including antibiotic exposure and delivery mode.

Microbial changes during the first month of life in preterm infants may reflect a combination of host developmental processes and external influences such as antibiotic exposure or delivery mode.

• Multiple clinical variables including prematurity, antibiotic exposure, and feeding modalities were considered as factors influencing gut microbiota establishment.
• The study identified microbial signatures providing 'preliminary insights into early gut microbiota and virome development in preterm infants.'
• The authors note that 'functional relevance and long-term stability require confirmation in larger, well-powered longitudinal studies with denser temporal sampling.'
• The underdeveloped immune systems and immature gastrointestinal tract of preterm infants were cited as factors heightening vulnerability.