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- W4225378045 abstract "The enteric nervous system regulates the functions of the gastrointestinal system, which include food transportation, digestion, nutrient and liquid absorption and expulsion of waste. The enteric nervous system is comprised of neurons and glia that are primarily derived from a multipotent, migratory population of cells called neural crest cells. Defects in the formation, migration and or differentiation of neural crest cells can lead to incomplete colonization of the gastrointestinal tract and perturbed ENS development resulting in Hirschsprung disease. Hirschsprung disease is a congenital disorder characterized by the absence of ganglia in variable regions of the gastrointestinal tract and ~50% of the known cases of Hirschsprung disease have an unknown genetic diagnosis. This makes it imperative to identify other genes and biological processes that contribute to the etiology and pathogenesis of Hirschsprung disease. We have identified three new genes, Tcof1, Polr1a and Polr1c, and the process of rDNA transcription which is a rate-limiting step in ribosome biogenesis, as novel regulators of neural crest cell development, enteric nervous system formation and the etiology of Hirschsprung disease. Loss of function mutation of Tcof1, Polr1a and Polr1c in neural crest cells results in total intestinal aganglionosis, the most severe form of Hirschsprung disease in mice. Mechanistically, downregulation of Tcof1, Polr1a and Polr1c results in reduced rRNA synthesis, which leads to increased p53-dependent NCC apoptosis, and insufficient NCC to colonize the gut. This led us to hypothesize that inhibition of p53 could rescue the Hirschsprung phenotype in the mutants, and we are currently testing this and other and other approaches as potential preventative therapies." @default.
- W4225378045 created "2022-05-05" @default.
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- W4225378045 date "2022-05-01" @default.
- W4225378045 modified "2023-09-23" @default.
- W4225378045 title "Novel roles for rRNA and ribosome biogenesis associated factors in neural crest cell colonization of the gut and in the pathogenesis of Hirschsprung disease" @default.
- W4225378045 doi "https://doi.org/10.1096/fasebj.2022.36.s1.r2190" @default.
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