Related Experiment Video

Updated: Aug 22, 2026

Generating a Reproducible Model of Mid-Gestational Maternal Immune Activation using Poly(I:C) to Study Susceptibility and Resilience in Offspring
09:09

Generating a Reproducible Model of Mid-Gestational Maternal Immune Activation using Poly(I:C) to Study Susceptibility and Resilience in Offspring

Published on: August 17, 2022

The gestational ecosystem: decoding mechanistic links between the maternal microbiome, obstetric outcomes, and

Lelin Chen1,2

  • 1Zhujin Community Health Service Center, Shantou, Guangdong, China Longhu District.

Journal of Obstetrics and Gynaecology : the Journal of the Institute of Obstetrics and Gynaecology
|August 20, 2026
PubMed

Pregnancy is now recognised as a dynamic gestational ecosystem where maternal microbial communities influence maternal physiology, obstetric outcomes, and offspring health. This review synthesises recent advances in understanding the maternal microbiome's role in this process.

We examine the spatial and temporal dynamics of the maternal microbiome, highlighting niche-specific remodelling in the gut, vagina, and oral cavity, and critically appraise the controversial evidence for a placental microbiome. We explore cutting-edge mechanistic pathways, including immunomodulation via short-chain fatty acids (SCFAs) and histamine, metabolic cross-talk through bile acids and neurotransmitters, vascular disruption via metabolites like trimethylamine N-oxide (TMAO), and the role of biofilm-associated infection. These pathways link microbial dysbiosis to adverse outcomes such as preterm birth, preeclampsia, and gestational diabetes. Furthermore, we detail how maternal microbes program offspring metabolic, immune, and neurodevelopmental trajectories through vertical transmission and metabolite-mediated epigenetic regulation.

This review shows that the maternal microbiome is a modifiable axis that influences pregnancy outcomes and offspring health through immune, metabolic, and epigenetic pathways. Translation to practice will require stronger causal evidence, contamination-aware low-biomass methods, and carefully designed intervention trials, including next-generation probiotics, postbiotics, and precision lifestyle strategies.

Keywords:
Maternal microbiomeobstetric outcomesoffspring programmingprecision interventionsshort-chain fatty acids

Related Concept Videos

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,...
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...
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 Modulation by Antibiotics01:21

Microbiota Modulation by Antibiotics

Antibiotics have revolutionized modern medicine by saving countless lives from bacterial infections. However, their widespread use has inadvertently harmed the delicate balance of the human gut microbiota. The gut microbiota, a complex community of bacteria, archaea, viruses, and fungi, plays a vital role in regulating metabolism, immune responses, and maintaining intestinal health. Antibiotics, especially broad-spectrum types, disrupt this ecosystem by eradicating both harmful and beneficial...
The Oral Microbiota01:27

The Oral Microbiota

The oral microbiome includes a complex ecosystem comprising over 700 microbial species, identified through genomic sequencing and culture-based analyses to date. This community includes a core microbiome, found universally among individuals, and a variable component influenced by environmental factors such as diet, lifestyle, and host genetics. Site-specific conditions, including oxygen gradients, pH levels, and nutrient availability, determine the spatial distribution of these microorganisms...
Gut-Brain Axis01:22

Gut-Brain Axis

The gut–brain axis is a bidirectional communication system that connects the gastrointestinal tract and the brain. This interaction is mediated through multiple pathways, including the vagus nerve, hormonal signals, immune responses, and chemical messengers produced by gut microbes.Microbial Contributions to Brain FunctionGut microbiota contributes significantly to brain function by producing neuroactive compounds. These include neuroactive compounds that influence neurotransmitters such as...