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- inflammatory bowel disease
- paediatric gastroenterology
- Crohn's disease
- enteral nutrition
- genetic testing
We read with interest the recent paper by Plantinga et al showing a role for the threonine to alanine (T300A)-variant of ATG16L1 in regulating the expression of ATG16L1 and cytokine production in response to a NOD2-ligand.1 ATG16L1, notably T300A (rs2241880) in exon 9, was first implicated in Crohn's disease (CD) susceptibility in a non-synonymous single nucleotide polymorphism (SNP) study, followed by a tagging SNP study and regression analysis.2 These authors were unable to demonstrate differences in ATG16L1 expression based on T300A-genotype or intestinal inflammation.
ATG16L1 consists of a N-terminal Atg5-interacting domain, a coiled-coil domain (involved in self-dimerisation, containing the T300A variant) and seven WD-domains (putatively interacting with NOD2) at the C-terminus. In ATG16L1-deficient and hypomorphic mice, canonical and bacteria-induced autophagy, Paneth-cell homeostasis and interleukin-1β secretion were dependent on ATG16L1.3 ,4 By contrast, studies focusing on T300A have shown conflicting results.1 , …
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