Mar 25, 2020

Dissecting Hes-centered transcriptional networks in neural stem cell maintenance and tumorigenesis in Drosophila

BioRxiv : the Preprint Server for Biology
S. S. MagadiChristos Delidakis

Abstract

Neural stem cells divide during embryogenesis and post embryonic development to generate the entire complement of neurons and glia in the nervous system of vertebrates and invertebrates. Studies of the mechanisms controlling the fine balance between neural stem cells and more differentiated progenitors have shown that in every asymmetric cell division progenitors send a Delta-Notch signal back to their sibling stem cells. Here we show that excessive activation of Notch or overexpression of its direct targets of the Hes family causes stem-cell hyperplasias in the Drosophila larval central nervous system, which can progress to malignant tumours after allografting to adult hosts. We combined transcriptomic data from these hyperplasias with chromatin occupancy data for Dpn, a Hes transcription factor, to identify genes regulated by Hes factors in this process. We show that the Notch/Hes axis represses a cohort of transcription factor genes. These are excluded from the stem cells and promote early differentiation steps, most likely by preventing the reversion of immature progenitors to a stem-cell fate. Our results suggest that Notch signalling sets up a network of mutually repressing stemness and anti-stemness transcription factors...Continue Reading

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Mentioned in this Paper

Study
Environment
Nucleic Acid Sequencing
Laboratory
Gene Delivery Systems
Sequencing
Extraction
Microbiome
Microbiota (Procedure)
Microbial

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