ArticleBMC medical genomics2024
MYO5B gene mutations may promote the occurrence of very early onset inflammatory bowel disease: a case report.
Article in BMC medical genomics, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.
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Who cites it
4 citing papers in PubMed.
- MYO5B deficiency is associated with altered MUC13 localization and DMBT1 accumulation in intestinal epithelial cells.American journal of physiology. Gastrointestinal and liver physiology · 2026Article
- Clinical Phenotypes and Genetic Findings in Very-Early-Onset Inflammatory Bowel Disease: A Vietnamese Pediatric Cohort Study.Children (Basel, Switzerland) · 2026Article
- Monogenic forms of inflammatory bowel disease: Genetic mechanisms, models, and clinical implications.Molecular medicine (Cambridge, Mass.) · 2026Review
- Advances in Understanding Intestinal Homeostasis: Lessons from Inflammatory Bowel Disease and Monogenic Intestinal Disorder Pathogenesis.International journal of molecular sciences · 2025Review
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6 authors.
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Abstract
backgroundWith recent advances in gene sequencing technology, more than 60 genetic mutations associated with very early onset inflammatory bowel disease (VEO-IBD) have been reported. Most of the genes are associated with immune deficiencies. The Myosin 5B (MYO5B) gene is primarily involved in cell motility and material transport which is associated with congenital intractable diarrhea and cholestasis. No studies have examined the relationship between the MYO5B gene and VEO-IBD. We report a case of a child with a mutation in the MYO5B gene who was diagnosed with VEO-IBD, then we investigated the association between the MYO5B gene and VEO-IBD. CASE PRESENTATION: A 7-month-old baby girl with a chief complaint of "blood in the stool for more than 4 months and vaginal pus and blood discharge for 3 weeks" was diagnosed with VEO-IBD, and her symptoms improved after treatment with mesalazine. The whole-exome sequencing was performed with peripheral blood. Immunohistochemistry was performed on the terminal ileal tissue. Western blotting, quantitative polymerase chain reaction (Q-PCR) and immunofluorescence were performed with cultured organoid tissue from the terminal ileum. Whole-exome sequencing identified heterozygous missense of MYO5B variant of unknown significance (p. [I769N]; [T1546M]). Immunohistochemistry revealed a significant decrease in the expression of MYO5B protein in the terminal ileum of the child with MYO5B mutation; Q-PCR revealed a decrease in the mRNA levels of occludin and ZO-1 and both the mRNA levels and protein levels of MYO5B was downregulated in the patient. Immunofluorescence images showed that MYO5B gene mutation disrupted the apical delivery of transporters SGLT1, NHE3 and AQP7.
conclusionsMYO5B gene mutation leading to the downregulation of MYO5B protein may promote the occurrence of VEO-IBD by decreasing mRNA and protein levels of intestinal tight junction genes and dislocating the apical transporters.
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