Optogenetics
Optogenetics (from Greek, Modern optikós, meaning 'seen, visible') is a biological technique that involves the use of light to control cells in living tissue, typically neurons, that have been genetically modified to express light-sensitive ion channels. It is a neuromodulation method that uses a combination of techniques from optics and genetics to control and monitor the activities of individual neurons in living tissue—even within freely-moving animals—and to precisely measure these manipulation effects in real-time.[1] The key reagents used in optogenetics are light-sensitive proteins. Neuronal control is achieved using optogenetic actuators like channelrhodopsin, halorhodopsin, and archaerhodopsin, while optical recording of neuronal activities can be made with the help of optogenetic sensors for calcium (GCaMP), vesicular release (synapto-pHluorin), neurotransmitter (GluSnFRs), or membrane voltage (arc lightning, ASAP1).[2][3] Control (or recording) of activity is restricted to genetically defined neurons and performed in a spatiotemporal-specific manner by light.
In 2010, optogenetics was chosen as the "Method of the Year" across all fields of science and engineering by the interdisciplinary research journal Nature Methods.[4] At the same time, optogenetics was highlighted in the article on "Breakthroughs of the Decade" in the academic research journal Science.[5] These journals also referenced recent public-access general-interest video Method of the year video and textual SciAm summaries of optogenetics.
Contents
History[edit]
The "far-fetched" possibility of using light for selectively controlling precise neural activity (action potential) patterns within subtypes of cells in the brain was thought of by Francis Crick in his Kuffler Lectures at the University of California in San Diego in 1999.[6] An earlier use of light to activate neurons was carried out by Richard Fork,[7] who demonstrated laser activation of neurons within intact tissue, although not in a genetically-targeted manner. The earliest genetically targeted method that used light to control rhodopsin-sensitized neurons was reported in January 2002, by Boris Zemelman and Gero Miesenböck, who employed Drosophila rhodopsin cultured mammalian neurons.[8] In 2003, Zemelman and Miesenböck developed a second method for light-dependent activation of neurons in which single inotropic channels TRPV1, TRPM8 and P2X2 were gated by photocaged ligands in response to light.[9] Beginning in 2004, the Kramer and Isacoff groups developed organic photoswitches or "reversibly caged" compounds in collaboration with the Trauner group that could interact with genetically introduced ion channels.[10][11] TRPV1 methodology, albeit without the illumination trigger, was subsequently used by several laboratories to alter feeding, locomotion and behavioral resilience in laboratory animals.[12][13][14] However, light-based approaches for altering neuronal activity were not applied outside the original laboratories, likely because the easier to employ channelrhodopsin was cloned soon thereafter.[15]
Peter Hegemann, studying the light response of green algae at the University of Regensburg, had discovered photocurrents that were too fast to be explained by the classic g-protein-coupled animal rhodopsins.[16] Teaming up with the electrophysiologist Georg Nagel at the Max Planck Institute in Frankfurt, they could demonstrate that a single gene from the alga Chlamydomonas produced large photocurents when expressed in the oocyte of a frog.[17] To identify expressing cells, they replaced the cytoplasmic tail of the algal protein with the fluorescent protein YFP, generating the first generally applicable optogenetic tool.[15]
Zhuo-Hua Pan of Wayne State University, researching on restore sight to blindness, thought about using channelrhodopsin when it came out in late 2003. By February 2004, he was trying channelrhodopsin out in ganglion cells—the neurons in our eyes that connect directly to the brain—that he had cultured in a dish. Indeed, the transfected neurons became electrically active in response to light. In 2005, Zhuo-Hua Pan reported successful in-vivo transfection of channelrhodopsin in retinal ganglion cells of mice, and electrical responses to photostimulation in retinal slice culture[18]
In April 2005, Susana Lima and Miesenböck reported the first use of genetically-targeted P2X2 photostimulation to control the behaviour of an animal.[19] They showed that photostimulation of genetically circumscribed groups of neurons, such as those of the dopaminergic system, elicited characteristic behavioural changes in fruit flies.
In August 2005, Karl Deisseroth's laboratory in the Bioengineering Department at Stanford including graduate students Ed Boyden and Feng Zhang published the first demonstration of a single-component optogenetic system in cultured mammalian neurons,[20][21] using the channelrhodopsin-2(H134R)-eYFP construct from Nagel and Hegemann.[15]
The groups of Gottschalk and Nagel were first to use channelrhodopsin-2 for controlling neuronal activity in an intact animal, showing that motor patterns in the roundworm Caenorhabditis elegans could be evoked by light stimulation of genetically selected neural circuits (published in December 2005).[22] In mice, controlled expression of optogenetic tools is often achieved with cell-type-specific Cre/loxP methods developed for neuroscience by Joe Z. Tsien back in the 1990s[23] to activate or inhibit specific brain regions and cell-types in vivo.[24]
The primary tools for optogenetic recordings have been genetically encoded calcium indicators (GECIs). The first GECI to be used to image activity in an animal was cameleon, designed by Atsushi Miyawaki, Roger Tsien and coworkers.[25] Cameleon was first used successfully in an animal by Rex Kerr, William Schafer and coworkers to record from neurons and muscle cells of the nematode C. elegans.[26] Cameleon was subsequently used to record neural activity in flies[27] and zebrafish.[28] In mammals, the first GECI to be used in vivo was GCaMP,[29] first developed by Nakai and coworkers.[30] GCaMP has undergone numerous improvements, and GCaMP6[31] in particular has become widely used throughout neuroscience.
In 2010, Karl Deisseroth at Stanford University was awarded the inaugural HFSP Nakasone Award "for his pioneering work on the development of optogenetic methods for studying the function of neuronal networks underlying behavior". In 2012, Gero Miesenböck was awarded the InBev-Baillet Latour International Health Prize for "pioneering optogenetic approaches to manipulate neuronal activity and to control animal behaviour." In 2013, Ernst Bamberg, Ed Boyden, Karl Deisseroth, Peter Hegemann, Gero Miesenböck and Georg Nagel were awarded The Brain Prize for "their invention and refinement of optogenetics."[32][33] Karl Deisseroth was awarded the Else Kröner Fresenius Research Prize 2017 (4 million euro) for his "contributions to the understanding of the biological basis of psychiatric disorders".
Description[edit]
Optogenetics provides millisecond-scale temporal precision which allows the experimenter to keep pace with fast biological information processing (for example, in probing the causal role of specific action potential patterns in defined neurons). Indeed, to probe the neural code, optogenetics by definition must operate on the millisecond timescale to allow addition or deletion of precise activity patterns within specific cells in the brains of intact animals, including mammals (see Figure 1). By comparison, the temporal precision of traditional genetic manipulations (employed to probe the causal role of specific genes within cells, via "loss-of-function" or "gain of function" changes in these genes) is rather slow, from hours or days to months. It is important to also have fast readouts in optogenetics that can keep pace with the optical control. This can be done with electrical recordings ("optrodes") or with reporter proteins that are biosensors, where scientists have fused fluorescent proteins to detector proteins. An example of this is voltage-sensitive fluorescent protein (VSFP2).[37] Additionally, beyond its scientific impact optogenetics represents an important case study in the value of both ecological conservation (as many of the key tools of optogenetics arise from microbial organisms occupying specialized environmental niches), and in the importance of pure basic science as these opsins were studied over decades for their own sake by biophysicists and microbiologists, without involving consideration of their potential value in delivering insights into neuroscience and neuropsychiatric disease.[38]
Light-activated proteins: channels, pumps and enzymes
The hallmark of optogenetics therefore is introduction of fast light-activated channels, pumps, and enzymes that allow temporally precise manipulation of electrical and biochemical events while maintaining cell-type resolution through the use of specific targeting mechanisms. Among the microbial opsins which can be used to investigate the function of neural systems are the channelrhodopsins (ChR2, ChR1, VChR1, and SFOs) to excite neurons and anion-conducting channelrhodopsins for light-induced inhibition. Indirectly light-controlled potassium channels have recently been engineered to prevent action potential generation in neurons during blue light illumination.[39][40] Light-driven ion pumps are also used to inhibit neuronal activity, e.g. halorhodopsin (NpHR),[41] enhanced halorhodopsins (eNpHR2.0 and eNpHR3.0, see Figure 2),[42] archaerhodopsin (Arch), fungal opsins (Mac) and enhanced bacteriorhodopsin (eBR).[43]
Optogenetic control of well-defined biochemical events within behaving mammals is now also possible. Building on prior work fusing vertebrate opsins to specific G-protein coupled receptors[44] a family of chimeric single-component optogenetic tools was created that allowed researchers to manipulate within behaving mammals the concentration of defined intracellular messengers such as cAMP and IP3 in targeted cells.[45] Other biochemical approaches to optogenetics (crucially, with tools that displayed low activity in the dark) followed soon thereafter, when optical control over small GTPases and adenylyl cyclases was achieved in cultured cells using novel strategies from several different laboratories.[46][47][48][49][50] This emerging repertoire of optogenetic probes now allows cell-type-specific and temporally precise control of multiple axes of cellular function within intact animals.[51]
Hardware for light application
Another necessary factor is hardware (e.g. integrated fiberoptic and solid-state light sources) to allow specific cell types, even deep within the brain, to be controlled in freely behaving animals. Most commonly, the latter is now achieved using the fiberoptic-coupled diode technology introduced in 2007,[52][53][54] though to avoid use of implanted electrodes, researchers have engineered ways to inscribe a "window" made of zirconia that has been modified to be transparent and implanted in mice skulls, to allow optical waves to penetrate more deeply to stimulate or inhibit individual neurons.[55] To stimulate superficial brain areas such as the cerebral cortex, optical fibers or LEDs can be directly mounted to the skull of the animal. More deeply implanted optical fibers have been used to deliver light to deeper brain areas. Complementary to fiber-tethered approaches, completely wireless techniques have been developed utilizing wirelessly delivered power to headborne LEDs for unhindered study of complex behaviors in freely behaving organisms.[56]
Expression of optogenetic actuators
Optogenetics also necessarily includes the development of genetic targeting strategies such as cell-specific promoters or other customized conditionally-active viruses, to deliver the light-sensitive probes to specific populations of neurons in the brain of living animals (e.g. worms, fruit flies, mice, rats, and monkeys). In invertebrates such as worms and fruit flies some amount of all-trans-retinal (ATR) is supplemented with food. A key advantage of microbial opsins as noted above is that they are fully functional without the addition of exogenous co-factors in vertebrates.[54]
Technique[edit]
The technique of using optogenetics is flexible and adaptable to the experimenter's needs. For starters, experimenters genetically engineer a microbial opsin based on the gating properties (rate of excitability, refractory period, etc..) required for the experiment.
There is a challenge in introducing the microbial opsin, an optogenetic actuator, into a specific region of the organism in question. A rudimentary approach is to introduce an engineered viral vector that contains the optogenetic actuator gene attached to a recognizable promoter such as CAMKIIα. This allows for some level of specificity as cells that already contain and can translate the given promoter will be infected with the viral vector and hopefully express the optogenetic actuator gene.
Another approach is the creation of transgenic mice where the optogenetic actuator gene is introduced into mice zygotes with a given promoter, most commonly Thy1. Introduction of the optogenetic actuator at an early stage allows for a larger genetic code to be incorporated and as a result, increases the specificity of cells to be infected.
A third and rather novel approach that has been developed is creating transgenic mice with Cre recombinase, an enzyme that catalyzes recombination between two lox-P sites. Then by introducing an engineered viral vector containing the optogenetic actuator gene in between two lox-P sites, only the cells containing the Cre recombinase will express the microbial opsin. This last technique has allowed for multiple modified optogenetic actuators to be used without the need to create a whole line of transgenic animals every time a new microbial opsin is needed.
After the introduction and expression of the microbial opsin, depending on the type of analysis being performed, application of light can be placed at the terminal ends or the main region where the infected cells are situated. Light stimulation can be performed with a vast array of instruments from light emitting diodes (LEDs) or diode-pumped solid state (DPSS). These light sources are most commonly connected to a computer through a fiber optic cable. Recent advances include the advent of wireless head-mounted devices that also apply LED to targeted areas and as a result give the animal more freedom of mobility to reproduce in vivo results.[58][59]
Issues[edit]
Although already a powerful scientific tool, optogenetics, according to Doug Tischer & Orion D. Weiner of the University of California San Francisco, should be regarded as a "first-generation GFP" because of its immense potential for both utilization and optimization.[60] With that being said, the current approach to optogenetics is limited primarily by its versatility. Even within the field of Neuroscience where it is most potent, the technique is less robust on a subcellular level.[61]
Selective expression[edit]
One of the main problems of optogenetics is that not all the cells in question may express the microbial opsin gene at the same level. Thus, even illumination with a defined light intensity will have variable effects on individual cells. Optogenetic stimulation of neurons in the brain is even less controlled as the light intensity drops exponentially from the light source (e.g. implanted optical fiber).
Moreover, mathematical modelling shows that selective expression of opsin in specific cell types can dramatically alter the dynamical behavior of the neural circuitry. In particular, optogenetic stimulation that preferentially targets inhibitory cells can transform the excitability of the neural tissue from Type 1 — where neurons operate as integrators — to Type 2 where neurons operate as resonators.[62] Type 1 excitable media sustain propagating waves of activity whereas Type 2 excitable media do not. The transformation from one to the other explains how constant optical stimulation of primate motor cortex elicits gamma-band (40–80 Hz) oscillations in the manner of a Type 2 excitable medium. Yet those same oscillations propagate far into the surrounding tissue in the manner of a Type 1 excitable medium.[63]
Nonetheless, it remains difficult to target opsin to defined subcellular compartments, e.g. the plasma membrane, synaptic vesicles, or mitochondria.[61][64] Restricting the opsin to specific regions of the plasma membrane such as dendrites, somata or axon terminals would provide a more robust understanding of neuronal circuitry.[61]
Kinetics and synchronization[edit]
An issue with channelrhodopsin-2 is that its gating properties don't mimic in vivo cation channels of cortical neurons. A solution to this issue with a protein's kinetic property is introduction of variants of channelrhodopsin-2 with more favorable kinetics.[55][56]
Another one of the technique's limitations is that light stimulation produces a synchronous activation of infected cells and this removes any individual cell properties of activation among the population affected. Therefore, it is difficult to understand how the cells in the population affected communicate with one another or how their phasic properties of activation may relate to the circuitry being observed.
Optogenetic activation has been combined with functional magnetic resonance imaging (ofMRI) to elucidate the connectome, a thorough map of the brain’s neural connections. The results, however, are limited by the general properties of fMRI.[61][65] The readouts from this neuroimaging procedure lack the spatial and temporal resolution appropriate for studying the densely packed and rapid-firing neuronal circuits.[65]
Excitation spectrum[edit]
The opsin proteins currently in use have absorption peaks across the visual spectrum, but remain considerable sensitivity to blue light.[61] This spectral overlap makes it very difficult to combine opsin activation with genenetically encoded indictors (GEVIs, GECIs, GluSnFR, synapto-pHluorin), most of which need blue light excitation. Opsins with infrared activation would, at a standard irradiance value, increase light penetration and augment resolution through reduction of light scattering.
Additional data indicates that the absorption spectra of organic dyes and fluorescent proteins, used in optogenetics applications, extends from around 250 nm to around 600 nm. Particular organic compounds used in discrete portions of this range include: retinals, flavins, folates, p-coumaric acids, phytochrome chromophotes, cobalamins, and at least six fluorescent proteins including mOrange and mCherry.[66]
Applications[edit]
The field of optogenetics has furthered the fundamental scientific understanding of how specific cell types contribute to the function of biological tissues such as neural circuits in vivo (see references from the scientific literature below). Moreover, on the clinical side, optogenetics-driven research has led to insights into Parkinson's disease[67][68] and other neurological and psychiatric disorders. Indeed, optogenetics papers in 2009 have also provided insight into neural codes relevant to autism, Schizophrenia, drug abuse, anxiety, and depression.[43][69][70][71]
Identification of particular neurons and networks[edit]
Amygdala[edit]
Optogenetic approaches have been used to map neural circuits in the amygdala that contribute to fear conditioning.[72][73][74][75] One such example of a neural circuit is the connection made from the basolateral amygdala to the dorsal-medial prefrontal cortex where neuronal oscillations of 4 Hz have been observed in correlation to fear induced freezing behaviors in mice. Transgenic mice were introduced with channelrhodoposin-2 attached with a parvalbumin-Cre promoter that selectively infected interneurons located both in the basolateral amygdala and the dorsal-medial prefrontal cortex responsible for the 4 Hz oscillations. The interneurons were optically stimulated generating a freezing behavior and as a result provided evidence that these 4 Hz oscillations may be responsible for the basic fear response produced by the neuronal populations along the dorsal-medial prefrontal cortex and basolateral amygdala.[76]
Olfactory bulb[edit]
Optogenetic activation of olfactory sensory neurons was critical for demonstrating timing in odor processing[77] and for mechanism of neuromodulatory mediated olfactory guided behaviors (e.g. aggression, mating)[78] In addition, with the aid of optogenetics, evidence has been reproduced to show that the "afterimage" of odors is concentrated more centrally around the olfactory bulb rather than on the periphery where the olfactory receptor neurons would be located. Transgenic mice infected with channel-rhodopsin Thy1-ChR2, were stimulated with a 473 nm laser transcranially positioned over the dorsal section of the olfactory bulb. Longer photostimulation of mitral cells in the olfactory bulb led to observations of longer lasting neuronal activity in the region after the photostimulation had ceased, meaning the olfactory sensory system is able to undergo long term changes and recognize differences between old and new odors.[79]
Nucleus accumbens[edit]
Optogenetics, freely moving mammalian behavior, in vivo electrophysiology, and slice physiology have been integrated to probe the cholinergic interneurons of the nucleus accumbens by direct excitation or inhibition. Despite representing less than 1% of the total population of accumbal neurons, these cholinergic cells are able to control the activity of the dopaminergic terminals that innervate medium spiny neurons (MSNs) in the nucleus accumbens.[80] These accumbal MSNs are known to be involved in the neural pathway through which cocaine exerts its effects, because decreasing cocaine-induced changes in the activity of these neurons has been shown to inhibit cocaine conditioning. The few cholinergic neurons present in the nucleus accumbens may prove viable targets for pharmacotherapy in the treatment of cocaine dependence[43]
Prefrontal cortex[edit]
In vivo and in vitro recordings (by the Cooper laboratory) of individual CAMKII AAV-ChR2 expressing pyramidal neurons within the prefrontal cortex demonstrated high fidelity action potential output with short pulses of blue light at 20 Hz (Figure 1).[34] The same group recorded complete green light-induced silencing of spontaneous activity in the same prefrontal cortical neuronal population expressing an AAV-NpHR vector (Figure 2).[34]
Heart[edit]
Optogenetics was applied on atrial cardiomyocytes to end spiral wave arrhythmias, found to occur in atrial fibrillation, with light.[81] This method is still in the development stage. A recent study explored the possibilities of optogenetics as a method to correct for arrythmias and resynchronize cardiac pacing. The study introduced channelrhodopsin-2 into cardiomyocytes in ventricular areas of hearts of transgenic mice and performed in vitro studies of photostimulation on both open-cavity and closed-cavity mice. Photostimulation led to increased activation of cells and thus increased ventricular contractions resulting in increasing heart rates. In addition, this approach has been applied in cardiac resynchronization therapy (CRT) as a new biological pacemaker as a substitute for electrode based-CRT.[82] Lately, optogenetics has been used in the heart to defibrillate ventricular arrhythmias with local epicardial illumination,[83] a generalized whole heart illumination[84] or with customized stimulation patterns based on arrhythmogenic mechanisms in order to lower defibrillation energy.[85]
Spiral ganglion[edit]
Optogenetic stimulation of the spiral ganglion in deaf mice restored auditory activity.[86][87] Optogenetic application onto the cochlear region allows for the stimulation or inhibition of the spiral ganglion cells (SGN). In addition, due to the characteristics of the resting potentials of SGN's, different variants of the protein channelrhodopsin-2 have been employed such as Chronos and CatCh. Chronos and CatCh variants are particularly useful in that they have less time spent in their deactivated states, which allow for more activity with less bursts of blue light emitted. The result being that the LED producing the light would require less energy and the idea of cochlear prosthetics in association with photo-stimulation, would be more feasible.[88]
Brainstem[edit]
Optogenetic stimulation of a modified red-light excitable channelrhodopsin (ReaChR) expressed in the facial motor nucleus enabled minimally invasive activation of motoneurons effective in driving whisker movements in mice.[89] One novel study employed optogenetics on the Dorsal Ralphe Nucleus to both activate and inhibit dopaminergic release onto the ventral tegmental area. To produce activation transgenic mice were infected with channelrhodopsin-2 with a TH-Cre promoter and to produce inhibition the hyperpolarizing opsin NpHR was added onto the TH-Cre promoter. Results showed that optically activating dopaminergic neurons led to an increase in social interactions, and their inhibition decreased the need to socialize only after a period of isolation.[90]
Precise temporal control of interventions[edit]
The currently available optogenetic actuators allow for the accurate temporal control of the required intervention (i.e. inhibition or excitation of the target neurons) with precision routinely going down to the millisecond level. Therefore, experiments can now be devised where the light used for the intervention is triggered by a particular element of behavior (to inhibit the behavior), a particular unconditioned stimulus (to associate something to that stimulus) or a particular oscillatory event in the brain (to inhibit the event). This kind of approach has already been used in several brain regions:
Hippocampus[edit]
Sharp waves and ripple complexes (SWRs) are distinct high frequency oscillatory events in the hippocampus thought to play a role in memory formation and consolidation. These events can be readily detected by following the oscillatory cycles of the on-line recorded local field potential. In this way the onset of the event can be used as a trigger signal for a light flash that is guided back into the hippocampus to inhibit neurons specifically during the SWRs and also to optogenetically inhibit the oscillation itself[91] These kinds of "closed-loop" experiments are useful to study SWR complexes and their role in memory.
Cellular biology/cell signaling pathways[edit]
The optogenetic toolkit has proven pivotal for the field of neuroscience as it allows precise manipulation of neuronal excitability. Moreover, this technique has been shown to extend outside neurons to an increasing number of proteins and cellular functions.[60] Cellular scale modifications including manipulation of contractile forces relevant to cell migration, cell division and wound healing have been optogenetically manipulated.[92] The field has not developed to the point where processes crucial to cellular and developmental biology and cell signaling including protein localization, post-translational modification and GTP loading can be consistently controlled via optogenetics.[60]
Photosensitive proteins utilized in various cell signaling pathways[edit]
While this extension of optogenetics remains to be further investigated, there are various conceptual methodologies that may prove to immediately robust. There is a considerable body of literature outlining photosensitive proteins that have been utilized in cell signaling pathways.[60] CRY2, LOV, DRONPA and PHYB are photosynthetic proteins involved in inducible protein association whereby activation via light can induce/turn off a signaling cascade via recruitment of a signaling domain to its respective substrate.[93][94][95][96] LOV and PHYB are photosensitive proteins that engage in homodimerization and/or heterodimerization to recruit some DNA-modifying protein, translocate to the site of DNA and alter gene expression levels.[97][98][99] CRY2, a protein that inherently clusters when active, has been fused with signaling domains and subsequently photoactivated allowing for clustering-based activation.[100] Proteins LOV and Dronpa have also been adapted to cell signaling manipulation; exposure to light induces conformational changes in the photosensitive protein which can subsequently reveal a previously obscured signaling domain and/or activate a protein that was otherwise allosterically inhibited.[101][102] LOV has been fused to caspase 3 to produce a construct capable of inducing apoptosis upon light stimulation.[103]
Optogenetic temporal control of signals[edit]
A different set of signaling cascades respond to stimulus timing duration and dynamics.[104] Adaptive signaling pathways, for instance, adjust in accordance to the current level of the projected stimulus and display activity only when these levels change as opposed to responding to absolute levels of the input.[105] Stimulus dynamics also can trigger activity; treating PC12 cells with epidermal growth factor (inducing a transient profile of ERK activity) leads to cellular proliferation whereas introduction of nerve growth factor (inducing a sustained profile of ERK activity) is associated with a different cellular decision whereby the PC12 cells differentiate into neuron-like cells.[106] This discovery was guided pharmacologically but the finding was replicated utilizing optogenetic inputs instead.[107] This ability to optogenetically control signals for various time durations is being explored to elucidate various cell signaling pathways where there is not a strong enough understanding to utilize either drug/genetic manipulation.[60]
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Further reading[edit]
This article's further reading may not follow Wikipedia's content policies or guidelines. Please improve this article by removing less relevant or redundant publications with the same point of view; or by incorporating the relevant publications into the body of the article through appropriate citations. (August 2014) (Learn how and when to remove this template message) |
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External links[edit]
This article's use of external links may not follow Wikipedia's policies or guidelines. (October 2013) (Learn how and when to remove this template message) |
- Optogenetics: shedding light on the brain's secrets Scientifica
- Optogenetics Resource Center, maintained by the Deisseroth lab.
- Synthetic Neurobiology Group, MIT, the portal of the Boyden lab.
- OpenOptogenetics.org, an optogenetics wiki, and its companion blog.
- Molecular Neurogenetics and Optophysiology Laboratory,"Optogenetic activation and silencing recordings of individual prefrontal cortical neurons in vivo and in vitro.
- Sohal lab portal
- Nurmikko lab portal
- Lab of Dr. Zhuo-Hua Pan
- Optophysiology at the Tyler lab
- Video: Ed Boyden on Optogenetics -- selective brain stimulation with light (SPIE Newsroom, April 2011)