Optogenetics is a scientific technique that uses light to control and manipulate the activity of cells in living organisms. It involves using specialized proteins that respond to light to activate or inhibit specific cells, allowing scientists to understand and study their functions. It can be thought of as a way to switch certain cells on or off using light.
Full definition
The cooperation partners in Switzerland — researchers from the ETH and the University of Zurich —
used optogenetic stimulation in combination with intensive rehabilitation training to restore the paralysed paw function in rats.
In total, the researchers applied the LITE system to 28 different genes to establish it as «a novel mode
of optogenetic control of endogenous cellular processes.»
In this web exclusive, the author offers a longer version of his December 2010 Scientific American article on how researchers can probe how the nervous system works in unprecedented detail, using a technique called optogenetics
This biomolecule is used
in optogenetic applications, which is deployed to control the activity of living cells with light.
«In parallel, the development of
optogenetic techniques for manipulating the activity of brain cells has made possible the demonstration of a causal relationship between these neural patterns and the associated mental activity.
They also provide probes that are engineered for single unit recording combined
with optogenetics with minimal photoelectric artifacts.
She characterises, for example, the properties of different light - sensitive proteins and identifies the ones that are best suited as
optogenetic tools.
Using light to control neurons, a technique known
as optogenetics pioneered by fellow NYSCF — Robertson Investigator Ed Boyden, further revealed the role of these neurons in loneliness and socializing.
Application of
optogenetic stimulation in zebrafish larvae does not require fiber optics, but it does require the correct wavelength (color) of light.
, opening up the possibility of adapting GFP lines
for optogenetics experiments in specific cell populations.
Neuroscientists have used
optogenetics methods to control the firing of neurons in animals, and others have also fused light - sensitive switches to enzymes, but this new approach goes beyond that to allow light to control a chosen gene, explains MIT neuroscientist Edward Boyden.
Next, the team used
optogenetic approaches to engineer these neurons so that they could either turn them on or off with light.
Additional evidence for the importance of stimulation specificity arises from
optogenetic studies in animals.
Witten and her research team performed
optogenetic experiments with the mice to isolate precisely which circuits of the brain are involved in social - spatial learning.
Postdoctoral researcher and first author Phillip Kyriakakis demonstrates the desktop system powered by the new
optogenetic switch researchers developed.
Here we compare the properties of memories formed
by optogenetic activation of individual DAN cell types.
Boyden's group published the first study
on optogenetics just 10 years ago this past summer.
This image shows a male fly being exposed to red light to trigger
optogenetic activation of CRZ neurons, which causes ejaculation.
Researchers could program the machine vision program on the computer to apply
optogenetic controls tied to certain behaviors, deliver vibrations or cause the fly's food to move to assess memory, motivation and other behaviors.
Optogenetics works by causing certain neurons in the brain to express a protein that is sensitive to light.
Methods
from optogenetics and machine learning should help improve treatment options for stroke patients.
The researchers in the present study used a light puff of air to stimulate either the right or left whiskers of mice, some of which had an especially low number of dopamine cells, while using a
new optogenetic tool called an optopatcher.
The first genetically encoded optical tool that can precisely control brain cells (neurons) by the millisecond,
optogenetics allows for light - induced control of neuronal activity, helping researchers understand how neurons form circuits that control behavior.
NLuc additonally allows researchers to convert FRET biosensors into more versatile BRET biosensors that can even be paired with
optogenetic regulators.
Boyden said three commercial firms now are
developing optogenetic methods to insert light - sensitive molecules into other cells in the eye that would transmit visual information directly to the brain.
Without optogenetic stimulation, rats would give longer looks at novel images than at familiar ones.
Casey writes that Prof. Edward Boyden was honored for his work
creating optogenetics, Prof. Joseph Formaggio and his team were honored for their research on neutrinos, and Profs. Larry Guth and Liang Fu won New Horizons Prizes.
Focusing on the neural pathway from the brain's prefrontal cortex to the amygdala, they
combined optogenetics — a technique that uses light to control the activity of neurons in living tissue — with behavioral testing, a methodology that allows researchers to study functional connections between different regions of the brain.
Finally, because light can be applied non-invasively, its use is not restricted to cultured cells but extends to freely moving animals, as established for
conventional optogenetic tools.»
The researchers have succeeded in controlling animal behavior
via optogenetic stimulation of f - VLEDs.
The human observers did not know whether the image was novel or familiar and were similarly blinded to whether and when the brains of the rats were stimulated with
optogenetic light.
To find out whether ejaculation produced an immediate pleasurable response, the researchers used an arena in which one side emitted a red light to
trigger optogenetic activation of CRZ neurons and tracked where male flies chose to spend their time.
However, when the nucleus accumbens shell neurons were turned off, using
optogenetic inhibition, the rats changed their behavior more quickly and began pushing the other lever sooner.
Ingaki and colleagues (8) were interested in using photoactivatable,
optogenetic accuators to depolarize or hyperpolarize membranes.
Direct optogenetic activation of phasic and tonic action - potential firing of NR neurons during memory acquisition enhanced or reduced memory generalization, respectively.
Although optogenetic control of human behavior may be years away, Deisseroth comments that the longer - range implications of the technology must be considered: «I'm not writing ethics papers, but I think about these issues every day, what it might mean to gain understanding and control over what is a desire, what is a need, what is hope.»
One area that has just come to the fore
involves optogenetic techniques, which allow neuroscientists to selectively manipulate the activity of specific neurons using light.
The wrongness of drone strikes and neuro - weapons research, the downside of psychiatric drugs and tests for cancer, hype
about optogenetics and deep brain stimulation and theories of cosmic creation.
Working with Deisseroth and fellow graduate student Ed Boyden, Zhang developed key elements of an approach
dubbed optogenetics, which uses light to control the activities of brain cells in living animals.
Eventually, he says, it might be possible to
extend optogenetics to synapses and use light to open and close connections, giving precise control over timing as well as location.
Pacing the Heart with Light Despite the fact that Deisseroth has focused on animal brains, the
first optogenetic implants — which could be ready for human trials in as little as a decade — will almost surely focus on other organs, where applications are less risky.
Phrases with «optogenetics»