Long-term live imaging of the Drosophila adult midgut reveals real-time dynamics of division, differentiation, and loss
Abstract
Organ renewal is governed by the dynamics of cell division, differentiation, and loss. To study these dynamics in real time, we present a platform for extended live imaging of the adult Drosophila midgut, a premier genetic model for stem cell-based organs. A window cut into a living animal allows the midgut to be imaged while intact and physiologically functioning. This approach prolongs imaging sessions to 12-16 hours and yields movies that document cell and tissue dynamics at vivid spatiotemporal resolution. Applying a pipeline for movie processing and analysis, we uncover new, intriguing cell behaviors: that mitotic stem cells dynamically re-orient, that daughter cells use slow kinetics of Notch activation to reach a fate-specifying threshold, and that enterocytes extrude via ratcheted constriction of a junctional ring. By enabling real-time study of midgut phenomena that were previously inaccessible, our platform opens a new realm for dynamic understanding of adult organ renewal.
Data availability
All data generated or analyzed during this study are included in the manuscript and supporting files. Source data files for figures have also been uploaded to Dryad (https://dx.doi.org/10.5061/dryad.1v1g1b0).
-
Data from: Long-term live imaging of the Drosophila adult midgut reveals real-time dynamics of division, differentiation, and lossDryad Digital Repository, doi:10.5061/dryad.1v1g1b0.
Article and author information
Author details
Funding
National Institutes of Health (R01GM116000-01A1)
- Judy Lisette Martin
- Erin Nicole Sanders
- Paola Moreno-Roman
- Leslie Ann Jaramillo Koyama
- Shruthi Balachandra
- XinXin Du
- Lucy Erin O'Brien
National Institutes of Health (1F31GM123736-01)
- Leslie Ann Jaramillo Koyama
National Institutes of Health (Stanford Discovery Fund Innovation Program)
- Lucy Erin O'Brien
Stanford University (Center for Biomedical Imaging at Stanford Seed Grant)
- Judy Lisette Martin
- Lucy Erin O'Brien
National Science Foundation (GRFP DGE-1656518)
- Erin Nicole Sanders
National Institutes of Health (2T32GM00779038)
- Erin Nicole Sanders
- Leslie Ann Jaramillo Koyama
William K. Bowes, Jr. Foundation (Stanford Bio X Bowes Graduate Fellowship)
- Paola Moreno-Roman
Stanford University (Stanford DARE (Diversifying Academia Recruiting Excellence) Fellowship)
- Paola Moreno-Roman
National Institutes of Health (NRSA 1F32GM115065)
- XinXin Du
Stanford University (Stanford Dean's Postdoctoral Fellowship)
- XinXin Du
The funders had no role in study design, data collection and interpretation, or the decision to submit the work for publication.
Reviewing Editor
- Allan C Spradling, Howard Hughes Medical Institute, Carnegie Institution for Science, United States
Version history
- Received: February 27, 2018
- Accepted: November 12, 2018
- Accepted Manuscript published: November 14, 2018 (version 1)
- Version of Record published: December 3, 2018 (version 2)
Copyright
© 2018, Martin et al.
This article is distributed under the terms of the Creative Commons Attribution License permitting unrestricted use and redistribution provided that the original author and source are credited.
Metrics
-
- 8,217
- views
-
- 950
- downloads
-
- 54
- citations
Views, downloads and citations are aggregated across all versions of this paper published by eLife.
Download links
Downloads (link to download the article as PDF)
Open citations (links to open the citations from this article in various online reference manager services)
Cite this article (links to download the citations from this article in formats compatible with various reference manager tools)
Further reading
-
- Neuroscience
- Stem Cells and Regenerative Medicine
Neural stem cells (NSCs) are multipotent and correct fate determination is crucial to guarantee brain formation and homeostasis. How NSCs are instructed to generate neuronal or glial progeny is not well understood. Here we addressed how murine adult hippocampal NSC fate is regulated and describe how Scaffold Attachment Factor B (SAFB) blocks oligodendrocyte production to enable neuron generation. We found that SAFB prevents NSC expression of the transcription factor Nuclear Factor I/B (NFIB) by binding to sequences in the Nfib mRNA and enhancing Drosha-dependent cleavage of the transcripts. We show that increasing SAFB expression prevents oligodendrocyte production by multipotent adult NSCs, and conditional deletion of Safb increases NFIB expression and oligodendrocyte formation in the adult hippocampus. Our results provide novel insights into a mechanism that controls Drosha functions for selective regulation of NSC fate by modulating the post-transcriptional destabilization of Nfib mRNA in a lineage-specific manner.
-
- Stem Cells and Regenerative Medicine
Retinitis pigmentosa (RP), a heterogenous group of inherited retinal disorder, causes slow progressive vision loss with no effective treatments available. Mutations in the rhodopsin gene (RHO) account for ~25% cases of autosomal dominant RP (adRP). In this study, we describe the disease characteristics of the first-ever reported mono-allelic copy number variation (CNV) in RHO as a novel cause of adRP. We (a) show advanced retinal degeneration in a male patient (68 years of age) harboring four transcriptionally active intact copies of rhodopsin, (b) recapitulated the clinical phenotypes using retinal organoids, and (c) assessed the utilization of a small molecule, Photoregulin3 (PR3), as a clinically viable strategy to target and modify disease progression in RP patients associated with RHO-CNV. Patient retinal organoids showed photoreceptors dysgenesis, with rod photoreceptors displaying stunted outer segments with occasional elongated cilia-like projections (microscopy); increased RHO mRNA expression (quantitative real-time PCR [qRT-PCR] and bulk RNA sequencing); and elevated levels and mislocalization of rhodopsin protein (RHO) within the cell body of rod photoreceptors (western blotting and immunohistochemistry) over the extended (300 days) culture time period when compared against control organoids. Lastly, we utilized PR3 to target NR2E3, an upstream regulator of RHO, to alter RHO expression and observed a partial rescue of RHO protein localization from the cell body to the inner/outer segments of rod photoreceptors in patient organoids. These results provide a proof-of-principle for personalized medicine and suggest that RHO expression requires precise control. Taken together, this study supports the clinical data indicating that RHO-CNV associated adRPdevelops as a result of protein overexpression, thereby overloading the photoreceptor post-translational modification machinery.