STX3 and microvillus inclusion disease: A severe form of hereditary diarrhea called microvillus inclusion disease (MVID, OMIM 251850) (Vogel et al. 2016) was described in five individuals with biallelic mutations of the syntaxin 3 gene (STX3, OMIM 600876) by us and by others (Alsaleem et al. 2017; Julia et al. 2019; Wiegerinck et al. 2014).