What is Sonogenetics?

An emerging neuroscience technique that uses genetically encoded ultrasound-sensitive proteins to control neural activity with focused ultrasound, potentially enabling non-invasive, deep-brain neuromodulation.

What category does Sonogenetics belong to in BCI?

Sonogenetics is a Emerging Technology concept in brain-computer interface science.

Sonogenetics — BCI Glossary

Sonogenetics combines genetic engineering with ultrasound technology to achieve targeted neural modulation. Neurons are genetically modified to express mechanosensitive ion channels that respond to ultrasound waves. When focused ultrasound is applied, only the modified neurons are activated — combining the cell-type specificity of optogenetics with the deep tissue penetration of ultrasound.

Principle

Sonogenetics relies on mechanosensitive proteins — ion channels that open in response to mechanical forces (pressure waves). Candidate proteins include:

MscL (Mechanosensitive channel of Large conductance): A bacterial mechanosensitive channel that can be expressed in mammalian neurons
TRPA1 and TRPV1: Mammalian ion channels with mechanosensitive properties
Prestin and other engineered variants: Modified proteins optimized for ultrasound sensitivity

When focused ultrasound is applied to tissue containing sonogenetically modified neurons, the pressure waves mechanically activate these channels, producing ion flow that depolarizes (excites) the neurons.

Advantages

Sonogenetics addresses key limitations of optogenetics:

Deep tissue penetration: Ultrasound penetrates through the skull and deep into brain tissue (centimeters), while light is absorbed within 1-2 mm of the source
Non-invasive delivery: Focused ultrasound can be delivered through the intact skull without implanted light sources
Spatial precision: Focused ultrasound can target volumes of a few cubic millimeters deep within the brain

Current Status

Sonogenetics is at an early research stage. Proof-of-concept demonstrations have been published in C. elegans and mice, showing that ultrasound can selectively activate neurons expressing mechanosensitive channels. The Bhatt and Bhatt labs at Salk Institute have been pioneering this work. Significant challenges remain: improving the sensitivity of mechanosensitive channels to clinically relevant ultrasound intensities, ensuring cell-type specificity, and demonstrating safety of chronic focused ultrasound exposure.

BCI Potential

If sonogenetics can be translated to humans, it could enable a truly non-invasive bidirectional BCI: EEG or other non-invasive recording for the read side, and focused ultrasound sonogenetic stimulation for the write side — with cell-type specificity and spatial precision far exceeding current non-invasive stimulation methods. This remains a long-term aspiration.