Genetics of Hirschsprung disease: Rare variants, in vivo analysis and expression profiling

Duco Schriemer

    Research output: ThesisThesis fully internal (DIV)

    1521 Downloads (Pure)

    Abstract

    Hirschsprung disease (HSCR) is characterized by the absence of neurons in the distal region of the colon. Due to the lack of neuronal innervation, the muscles in the colon are unable to relax, causing life-threatening obstipation. HSCR is a heritable disease. Over 15 genes have been associated with the disease, but mutations in these genes are found in only a quarter of all patients. We aimed to identify new disease genes for HSCR by focusing on de novo mutations. De novo mutations are new genetic variations that are found in a child, but not in the parents. We investigated whether genes carrying de novo mutations in HSCR patients are involved in the development of the nervous system in the gut. To this end we inactivated these genes one by one in a zebrafish model in which the cells of the nervous system are fluorescently labeled. This led to the identification of four new genes for HSCR. We employed the same zebrafish model to show that overexpression of a particular gene on chromosome 21 possibly explains the high prevalence of HSCR among patients with Down syndrome. Additionally, we studied which genes are important for the development of the nervous system in the gastrointestinal tract of the mouse. We identified several genes that are critical for this developmental process, and these genes are excellent candidate genes for HSCR.
    Original languageEnglish
    QualificationDoctor of Philosophy
    Awarding Institution
    • University of Groningen
    Supervisors/Advisors
    • Hofstra, Robert, Supervisor
    • Eggen, Bart, Co-supervisor
    • Laman, Jon Daniel, Assessment committee
    • Tam, P. K. H., Assessment committee, External person
    • Veltman, Joris A., Assessment committee, External person
    Award date20-Jun-2016
    Place of Publication[Groningen]
    Publisher
    Print ISBNs978-90-367-8900-4
    Electronic ISBNs978-90-367-8899-1
    Publication statusPublished - 2016

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