[Inflammatory bowel disease: genetic or environmental diseases?]

Area of Science:

• Gastroenterology and Immunology
• Molecular Biology and Genetics

Context:

• Inflammatory bowel diseases (IBD) are complex conditions influenced by genetic predisposition and environmental triggers.
• Epidemiological data show variations in IBD incidence and prevalence over time and geography, suggesting environmental roles.
• Established risk factors include smoking and appendectomy, while genetic factors are supported by twin and family studies.

Purpose:

• To explore the interplay between genetic susceptibility, environmental factors, and immune dysregulation in IBD pathophysiology.
• To investigate the potential role of the gut microbiota and modern environmental influences in IBD development.

Summary:

• IBD pathogenesis involves genetic susceptibility interacting with environmental factors, leading to aberrant intestinal immune responses and lesions.
• While genetics play a role (evidenced by twin/family studies and mutations like NOD2/CARD15), environmental factors are crucial.
• Emerging hypotheses highlight the gut microbiota's role, potentially influenced by modern lifestyle factors such as hygiene, diet, and pollution.

Impact:

• Identifies key areas for future research into IBD etiology, focusing on environmental exposures and the gut microbiome.
• Provides a framework for understanding how modern environmental changes may contribute to the increasing burden of IBD.
• Suggests potential avenues for novel therapeutic strategies targeting the gut microbiota and immune pathways in IBD.