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Episode 12 15.03.2015
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How does the brain build itself from a handful of precursor cells into billions of neurons organized in precise layers? Developmental neurobiologist Stephen Noctor explains the remarkable choreography of cell division, migration, and differentiation in the ventricular zone , where future neurons bounce up and down like yo-yos before embarking on journeys equivalent to climbing four Empire State Buildings. Subscribe for more from the Convergent Science Network podcast series. Stephen Noctor joins Paul Verschure and Tony Prescott at the BCBT summer school to describe his research on the precursor cells that generate the cerebral cortex. Using fluorescent labeling and time-lapse imaging in rat brain slices, Noctor has captured the movements of individual precursor cells as they undergo interkinetic nuclear migration , rapidly descending to the ventricular surface to divide, then slowly rising back through the ventricular zone in a process that may be largely passive. His movies reveal surprising behaviors: cells that pause, reverse direction, and emit transient processes that may serve as feedback conduits during migration. The discussion traces cortical construction from its earliest stages. Excitatory neurons are generated in the ventricular and subventricular zones and migrate radially outward, while inhibitory interneurons originate in the ganglionic eminences and travel tangentially. Noctor estimates fewer than ten distinct precursor cell types, which become progressively restricted in their output as development proceeds. He describes the inside-out lamination of the cortex, where later-born neurons migrate past earlier-born ones to settle just beneath the marginal zone , a process dependent on the signaling molecule reelin, without which the cortex inverts. Key topics include the orientation of cell division planes and what they reveal about fate determination, the role of radial glial fibers as scaffolds for migration, why the human brain generates roughly five billion cortical neurons over the course of pregnancy, the forgotten discoveries of Frederick Sauer from 1935, and how understanding normal development establishes a foundation for investigating neurodevelopmental disorders. Part of the Convergent Science Network podcast series from the BCBT Summer School.
Tagged as:
Brain Cell Division cortical development Migration Neurons precursor cells Stephen Noctor Ventricular Zone
About the author call_made
Both the triumphs of humanity and its most evil deeds have resulted from collaboration. In a time where humanity is required to aspire to the former and minimize the latter, the question arises of how collaboration arises and why it fails. Surprisingly, this phenomenon, so central to who we are, is not well understood. Hence, a collaborative effort is required to understand collaboration in its full biological, psychological, sociological, cultural, and economic complexity and to translate this understanding into operational impact. This series of podcasts is one step toward achieving these complementary goals. The Collaboration Podcast presents interviews with people who are central orchestrators of collaboration in various domains including business, government, science, art, health, sustainability, and the military. The discussions were conducted by Prof. Dr. Paul F.M.J. Verschure and members of the Program Advisory Committee of the Ernst Strungmann Forum on Collaboration (https://www.esforum.de/forums/ESF32_Collaboration.html) during 2021 and had the goal to sketch a map of opportunities, challenges, and obstacles in human collaboration. The forum took place in May 2022, and now we would like to share this series of interviews with a broader audience. The full report of the Forum will be published in 2023 by MIT Press. The podcast was produced by the Convergent Science Network (https://www.convergentsciencenetwork.org/). Context: The stability of social systems depends critically on realizing sustainable methods of “collaboration,” yet how and by which means collaboration is achieved is not clearly understood; neither are the conditions or processes that lead to its breakdown or failure. Collaboration can be understood as cooperation between agents toward mutually constructed goals. Part of the reason for our lack of understanding is that the phenomenon of collaboration is, by nature, a highly multidisciplinary problem, and effective research into its complexities has been difficult to achieve across the broad range of scientific and technical disciplines involved. The need for a fundamental understanding of collaboration, however, has become increasingly important. Not only does humankind demand answers as it attempts to address critical challenges at multiple scales (e.g., climate change, migration, enhanced automation, social and economic inequality), but ever-increasing technological and economic means of interconnecting people and societies are disrupting long-established, familiar patterns of how we interact. Radical technological changes that are ongoing have the potential to reshape collaboration in ways that are currently hard to predict or influence (e.g., by altering configurations in interaction, information creation, and modes of communication). On one hand, such changes could disrupt hitherto stable forms of collaboration by affecting critical communication channels and traditional roles, as can be observed in the rapidly changing patterns in governance, commerce, and social interaction. Conversely, technology could lead to the emergence of novel, successful forms of collaboration that deviate from traditional “hierarchical” architectures. Evidence of this can be seen in areas as diverse as highly automated manufacturing plants, the open science movement, collaborative software repositories, user-centered services, and the sharing of economy-based modes of organization. Without a fundamental understanding of the mechanisms, processes, and boundary conditions of collaboration, it is not possible to evaluate or predict which of these possible scenarios are sustainable or even plausible. The Forum “How Collaboration Arises and Why it Fails” (May 8–13, 2022, Location: Frankfurt am Main, Germany) Chairs: Andreas Roepstorff and Paul Verschure Program Advisory Committee: Jenna Bednar, Julia R. Lupp, Bhavani R. Rao , Andreas Roepstorff, Ferdinand von Siemens, and Paul Verschure
15.03.2015
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