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Generation of Induced Progenitor-Like Cells from …

We have built civilization’s cornerstones on amorphous, impermanent stuff. Coasts, rivers, deltas and earthquake zones are places of dramatic upheaval. Shorelines are constantly being rewritten. Rivers fussily overtop their banks and reroute themselves. With one hand, earthquakes open the earth, and with the other they send it coursing down hillsides. We settled those places for good reason. What makes them attractive is the same thing that makes them dangerous. Periodic disruption and change is the progenitor of diversity, stability and abundance. Where there is disaster, there is also opportunity. Ecologists call it the “intermediate disturbance hypothesis.”

Nup153 Interacts with Sox2 to Enable ..

We have built civilization’s cornerstones on amorphous, impermanent stuff. Coasts, rivers, deltas and earthquake zones are places of dramatic upheaval. Shorelines are constantly being rewritten. Rivers fussily overtop their banks and reroute themselves. With one hand, earthquakes open the earth, and with the other they send it coursing down hillsides. We settled those places for good reason. What makes them attractive is the same thing that makes them dangerous. Periodic disruption and change is the progenitor of diversity, stability and abundance. Where there is disaster, there is also opportunity. Ecologists call it the “intermediate disturbance hypothesis.”

The Origin of Species: Chapter 9 - TalkOrigins Archive

Neural Stem Cells and the Origin of Gliomas — NEJM


But one potential issue with the radial unit hypothesis is that the ventricles should grow proportionally to the neocortical growth through evolution. This isn’t the case. To circumvent this problem, the intermediate progenitor hypothesis suggests that the immediate product of asymmetric radial glia division is an intermediate progenitor rather than a neuron (C above). These intermediate progenitors migrate to the SVZ just above the radial glia and divide symmetrically some more to produce a crop of intermediate progenitors. Wherever you want more cortical neurons you let more intermediate progenitors be produced. Eventually these cells in a way that produces differentiated neurons and they migrate up to their proper position in the cortex. My favorite piece of evidence for this hypothesis is shown below. You can sort of predict where a cortical fold will be by measuring the thickness of the SVZ early in development. Thinner SVZs will be below sulci, and thicker ones will be below gyri.

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