Gut Microbes in Early Life Linked to Allergy Development

Childhood allergies are a significant public health concern, with nearly one in three children now experiencing at least one allergic disease, such as eczema, allergic rhinitis, or asthma . Recent research from the Technical University of Denmark (DTU) sheds light on the crucial role of intestinal microorganisms in the first months of life in determining a child’s susceptibility to allergies.

The Start Study: Tracking Toddler Microbiomes

A study led by Professor Susanne Brix Pedersen of DTU Bioengineering and immunologist Rasmus Kaae Delhi followed 147 children from birth to age five . This period is critical for both immune system development and the establishment of the gut microbiota.

The Role of Bifidobacteria and 4-OH-PLA

The research highlights the importance of Bifidobacteria, naturally present in the gut of some infants. These bacteria produce a metabolite called 4-hydroxyphenyl lactate (4-OH-PLA) during the first few weeks of life. This compound demonstrably slows down allergic reactions by reducing the production of immunoglobulin E (IgE) – the antibodies responsible for allergic responses – by up to 60%, without negatively impacting other essential antibodies needed for immunity.

Factors Promoting Beneficial Gut Bacteria

The Begin study as well investigated factors that encourage the colonization of the gut with these beneficial bacteria. These include vaginal birth, exclusive breastfeeding, and early interactions with other children. Children born vaginally are up to fourteen times more likely to acquire these essential Bifidobacteria from their mothers.

Genetic Analysis and the Microbiome-Immune System Connection

Genetic analysis of stool samples allowed researchers to precisely identify the bacterial species involved, establishing a biological link between the gut microbiota and the maturation of the immune system. This underscores the importance of these early months in shaping a child’s immune health.

DTU’s Research in Microbiology and Bioengineering

The Department of Biotechnology and Biomedicine (DTU Bioengineering) at the Technical University of Denmark is at the forefront of research into microbiology, biomedicine, and biotechnology . DTU also houses DTU Bright, a science innovation hub focused on biomanufacturing technologies, including microbial foods and agriculture . Tine Rask Licht, institute director at the DTU National Food Institute, is a professor of gut microbiology and holds an Executive MBA .