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Determination01:51

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During embryogenesis, cells become progressively committed to different fates through a two-step process: specification followed by determination. Specification is demonstrated by removing a segment of an early embryo, “neutrally” culturing the tissue in vitro—for example, in a petri dish with simple medium—and then observing the derivatives. If the cultured region gives rise to cell types that it would normally generate in the embryo, this means that it is specified. In contrast, determination...
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Where Top-Down Meets Bottom-Up: Cell-Type Specific Connectivity Map of the Whisker System.

Nicolas Rault1, Tido Bergmans2, Natasja Delfstra2

  • 1Donders Institute for Brain, Cognition and Behaviour, Radboud University, Nijmegen, The Netherlands. n.rault@neurophysiology.nl.

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|May 20, 2024
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Summary

Researchers mapped top-down neuromodulatory control circuits in the mouse whisker system. This reveals new connections and identifies key integration hubs, advancing our understanding of active sensing and sensorimotor computation.

Keywords:
ConnectivityGraph analysisNeuromodulatorsSensorimotor integration

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Systems Neuroscience

Background:

  • Sensorimotor computation integrates sensory input with internal goals for action planning.
  • Neuromodulatory neurotransmitters critically influence sensorimotor control, particularly in the rodent whisker system.
  • Understanding top-down neuromodulatory control circuits is essential for elucidating active sensing mechanisms.

Purpose of the Study:

  • To map the circuits of top-down neuromodulatory control within the mouse whisker system.
  • To identify novel connections and cell-type-specific pathways involved in whisker-related sensorimotor processing.
  • To update the sensorimotor connectivity map and analyze the network properties of neuromodulatory projections.

Main Methods:

  • Developed a neuroinformatic pipeline utilizing the Allen Institute's Mouse Brain Connectivity Atlas.
  • Employed network connectivity analysis and graph network analysis.
  • Anatomically confirmed new monosynaptic connections and mapped cell-type-specific projections.

Main Results:

  • Identified 42 previously unknown monosynaptic connections within the whisker system.
  • Created the first cell-type-specific map of 157 projections across 18 principal nuclei.
  • Revealed cell-type specific hubs, sources, and sinks, with inhibitory projections throughout the ascending pathway.
  • Demonstrated that neuromodulatory projections enhance overall network connectivity.

Conclusions:

  • Neuromodulatory networks in the whisker system possess circuit connectivity features enabling sensory and motor integration.
  • These findings expand the known connectome of the mouse whisker system and highlight the role of neuromodulation in sensorimotor computation.
  • The study provides a foundational cell-type-specific map for future investigations into active sensing mechanisms.