4.5 Review

Contributions of the early-life microbiome to childhood atopy and asthma development

Journal

SEMINARS IN IMMUNOLOGY
Volume 69, Issue -, Pages -

Publisher

ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.smim.2023.101795

Keywords

Atopy; Asthma; Microbiome; Immunity

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The rapid increase in atopy and asthma in industrialized nations has led to research on the influence of early life environmental factors, particularly on the human microbiome. Microbes play a crucial role in tuning and training host immunity, and their composition is influenced by various factors including those known to affect allergy and asthma risk. This review highlights the importance of studying the microbiome and its impact on childhood atopy and asthma, offering insights into microbial mediators of maladaptive immunity and chronic inflammatory disease in childhood.
The rapid rise in atopy and asthma in industrialized nations has led to the identification of early life environmental factors that promote these conditions and spurred research into how such exposures may mediate the trajectory to childhood disease development. Over the past decade, the human microbiome has emerged as a key determinant of human health. This is largely due to the increasing appreciation for the myriad of non-mutually exclusive mechanisms by which microbes tune and train host immunity. Microbiomes, particularly those in early life, are shaped by extrinsic and intrinsic factors, including many of the exposures known to influence allergy and asthma risk. This has led to the over-arching hypothesis that such exposures mediate their effect on childhood atopy and asthma by altering the functions and metabolic productivity of microbiomes that shape immune function during this critical developmental period. The capacity to study microbiomes at the genetic and molecular level in humans from the pre-natal period into childhood with well-defined clinical outcomes, offers an unprecedented opportunity to identify early-life and inter-generational determinants of atopy and asthma outcomes. Moreover, such studies provide an integrative microbiome research framework that can be applied to other chronic inflammatory conditions. This review attempts to capture key studies in the field that offer insights into the developmental origins of childhood atopy and asthma, providing novel insights into microbial mediators of maladaptive immunity and chronic inflammatory disease in childhood.

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