The Father’s Microbiome: A Hidden Contributor to Fetal and Long-Term Child Health

The influence of paternal microbiota on offspring health is an emerging research area that challenges the traditional focus on maternal factors. Recent evidence suggests that paternal gut microbial communities contribute to the early colonization of the neonatal gut. The composition of both gut and seminal microbiota can be shaped by environmental exposures such as diet, endocrine-disrupting chemicals, and lifestyle. These factors may also alter the sperm epigenome, affecting DNA methylation, histone modifications, and small non-coding RNAs. Microbial metabolites may influence these epigenetic pathways, potentially mediating transgenerational effects. This supports the hypothesis of a "gut-germline axis", primarily investigated in animal models. Through such epigenetic modifications, the paternal microbiota may influence offspring neurodevelopment, metabolic status, and gastrointestinal health. However, longitudinal human studies assessing paternal programming mediated by the microbiome are still lacking. Understanding the role of the paternal microbiome may open new paths for targeted preconception interventions to enhance reproductive outcomes and promote offspring health.