ALPI deficiency causes refractory Inflammation Bowel Disease

Study ID Alternative Stable ID Type
EGAS00001003350 Other

Study Description

Herein, we report the first identification of biallelic-inherited mutations in ALPI as a Mendelian cause of inflammatory bowel disease in two unrelated patients. ALPI encodes for intestinal phosphatase alkaline, a brush border metalloenzyme that hydrolyses phosphate from the lipid A moiety of lipopolysaccharides and thereby drastically reduces Toll-like receptor 4 agonist activity. Prediction tools and structural modelling indicate that all mutations affect critical residues or inter-subunit interactions, and heterologous expression in HEK293T cells demonstrated that all ALPI mutations were loss of function. ALPI mutations impaired either stability or catalytic activity of ALPI and rendered it unable to detoxify lipopolysaccharide-dependent signalling. Furthermore, ALPI expression was reduced in patients' biopsies, and ALPI activity was undetectable in ALPI-deficient patient's stool. Our findings highlight the crucial role of ALPI in regulating host-microbiota interactions and restraining host inflammatory responses. These results indicate that ALPI mutations should be included in ... (Show More)

Study Datasets 1 dataset.

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Dataset ID Description Technology Samples
This project focused on identifying rare coding variation that substantially increases risk of VEOIBD by exome sequencing of VEOIBD patients and some of their family members. Here you can find BAM files from an affected proband (P2) and his unaffected parents. In this study ALPI mutations were identified as a likely cause of the disease.
Illumina HiSeq 2500 3

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