Integrated genetic and functional analyses reveal the pathogenic effects of a novel STXBP3 variant in very-early-onset inflammatory bowel disease with immunodeficiency

Background

Very early onset inflammatory bowel disease (VEOIBD) is frequently driven by monogenic defects. Pathogenic variants in the syntaxin-binding protein 3 (STXBP3) gene have been implicated in VEOIBD; however, the relationship between specific variant types and clinical manifestations remains incompletely understood. This study aimed to identify the genetic cause in a patient with VEOIBD and explore the possible genotype-phenotype correlations of STXBP3-related disorders.