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Updated: Jul 15, 2025
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Tactile Semiautomatic Passive-Finger Angle Stimulator TSPAS
Published on: July 30, 2020
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Activity-dependent development of the body's touch receptors
Celine Santiago1, Nikhil Sharma2, Nusrat Africawala1
1Department of Neurobiology, Howard Hughes Medical Institute, Harvard Medical School, Boston, MA, 02115, USA.
Biorxiv : the Preprint Server for Biology
|October 4, 2023
Summary
Mechanically evoked neuronal activity is crucial for developing touch-sensing neurons. Deleting Piezo2 or the sodium channel Nav1.6 disrupts sensory neuron development and function, impacting the sense of gentle touch.
Area of Science:
- Neuroscience
- Developmental Biology
- Sensory Physiology
Background:
- The development of somatosensory neurons, responsible for touch sensation, is complex.
- The role of neuronal activity in shaping these sensory systems is not fully understood.
Purpose of the Study:
- To investigate the role of mechanically evoked neuronal activity in the development of primary sensory neurons.
- To determine how the mechanosensitive ion channel Piezo2 and voltage-gated sodium channel Nav1.6 influence somatosensory neuron maturation.
Main Methods:
- Genetic deletion of Piezo2 and Nav1.6 (Scn8a) in somatosensory neurons.
- Analysis of mechanosensory end organ structure and central targeting of neurons.
- Single-cell RNA sequencing to assess gene expression changes.
- Electrophysiological recordings to evaluate neuronal responses to mechanical stimuli.
Main Results:
- Deletion of Piezo2 led to significant alterations in mechanosensory end organ formation and neuron central targeting.
- Single-cell RNA sequencing revealed altered gene expression in light mechanical force-sensitive neurons of Piezo2 mutants.
- Scn8a mutants exhibited disrupted somatosensory neuron morphology and altered electrophysiological responses.
Conclusions:
- Mechanically evoked neuronal activity plays a critical role in the early maturation of mechanosensory end organs.
- This activity shapes the development of neural circuits underlying the sense of gentle touch.
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