Metagenomics and development of the gut microbiota in infants

Y Vallès1, M J Gosalbes, L E de Vries

  • 1Unitat Mixta d'Investigació en Genòmica i Salut, Centre Superior d'Investigació en Salut Pública/UVEG-Institut Cavanilles, València, Spain.

Insights

Infant gut microbiota development is complex and influenced by antibiotics. This study uses metagenomics to explore microbial functions, antibiotic resistance, and population dynamics in infant gut microbiomes.

Area of Science:

  • Microbiology
  • Genomics
  • Infant Health

Background:

  • A balanced intestinal microbiota is crucial for human health.
  • Infant gut microbial colonization is complex and varies significantly between individuals.
  • The infant gut microbiota can be exposed to antibiotics, potentially harboring resistant strains and genes.

Purpose of the Study:

  • To investigate infant microbiota development using diverse metagenomic approaches.
  • To analyze the deployment of functional capabilities at the community level.
  • To assess antibiotic resistances and population dynamics of dominant genera in infant gut microbiomes.

Main Methods:

  • Utilizing diverse metagenomic approaches.
  • Analyzing functional gene content and metabolic pathways.
  • Characterizing the abundance and dynamics of microbial genera.
  • Identifying and quantifying antibiotic resistance genes.

Main Results:

  • Detailed characterization of microbial community structure and function in infants.
  • Identification of specific antibiotic resistance genes and their prevalence.
  • Understanding the population dynamics of key bacterial genera during early life.
  • Insights into the early establishment of the infant gut microbiome.

Conclusions:

  • Metagenomic analysis provides a comprehensive view of infant gut microbiota development.
  • Antibiotic resistance is a significant factor in the early infant gut microbiome.
  • Understanding these dynamics is crucial for infant health and potential interventions.

Related Concept Videos

Development of Human Microbiota01:30

Development of Human Microbiota

The human microbiota begins developing at birth and undergoes continual change as we age. Infancy marks a critical period of microbial sensitivity, offering a “window of opportunity” during which beneficial microbes help mature the immune system. By age three, children typically develop a more stable and diverse microbial community. Newborns acquire microbes from their immediate environment; vaginal delivery favors maternal vaginal microbes, while cesarean births favor microbes from the skin...
Development of the Oral Microbiota01:28

Development of the Oral Microbiota

The establishment of the oral microbiome begins before birth, challenging the long-held belief that the fetal oral cavity is sterile. The presence of oral microbes such as Streptococcus and Fusobacterium in amniotic fluid suggests that microbial exposure may occur in utero, potentially through translocation from the maternal oral or gastrointestinal tract. This early colonization primes the neonatal immune system and sets the stage for subsequent microbial succession. Maternal health,...
Anatomy of the Intestines01:23

Anatomy of the Intestines

Although digestion of proteins, carbohydrates, and lipids may begin in the stomach, it is completed in the intestine. The absorption of nutrients, water, and electrolytes from food and drink also occurs in the intestine. The intestines can be divided into two structurally distinct organs—the small and large intestines.
Small Intestines
The small intestine is an ~7 meter-long tube with an inner diameter of just 2.5 cm. Since most nutrients are absorbed here, the inner lining of the small...
Introduction to the Human Microbiota01:22

Introduction to the Human Microbiota

Microorganisms colonize various regions of the human body, including the mouth, nasal passages, throat, stomach, intestines, urogenital tract, and skin. The total number of microbial cells is estimated to range from 10¹³ to 10¹⁴—comparable to, or exceeding, the number of human somatic cells. This host–microbiome relationship has led to the conceptualization of humans as supraorganisms, wherein microbial communities perform vital roles in development, immunity, and disease...
Microbiota of the Large Intestine01:27

Microbiota of the Large Intestine

The large intestine hosts the most densely populated microbial ecosystem in the human body. This complex community primarily consists of anaerobic bacteria, with Bacillota (formerly Firmicutes) and Bacteroidota (formerly Bacteroidetes) as the predominant groups. The distribution of these microbes varies along different sections of the large intestine, influenced by local environmental factors such as oxygen availability and nutrient composition.The cecum, located at the beginning of the large...
Functions of the Gut Microbiota01:18

Functions of the Gut Microbiota

The gut microbiota includes trillions of microorganisms that colonize the human gastrointestinal tract, including bacteria, archaea, viruses, and fungi. This complex ecosystem plays a critical role in maintaining intestinal and systemic health. Most of these microbes inhabit the large intestine, establishing a relatively stable and diverse community that contributes to gut homeostasis through various metabolic, immunological, and protective mechanisms.Dominant bacterial phyla, such as...