2026 Nobel Prize: Optogenetics and a New Era in Neuroscience

2026 Nobel Prize in Physiology or Medicine: Optogenetics

Why in News?

• Karl Deisseroth, Peter Hegemann and Georg Nagel have been awarded the 2026 Nobel Prize in Physiology or Medicine for discoveries that led to the development of optogenetics. 
• The three laureates will share the prize equally. 
• Optogenetics allows scientists to control specific nerve cells using light, helping them understand how the brain influences behaviour, emotions and movement. 

What is Optogenetics?

• Optogenetics combines genetic methods and light to control selected cells, especially neurons. 
• Scientists introduce genes that produce light-sensitive proteins into specific nerve cells. 
• When light is applied, these proteins open or close channels in the cell membrane. 
• This changes the electrical activity of neurons. 
• In simple terms, optogenetics acts like a light-controlled switch for nerve cells. 

How was it Developed?

• In the 1990s, Peter Hegemann studied the microscopic alga Chlamydomonas and found that light could trigger electrical signals in the organism. 
• Hegemann and Georg Nagel later identified light-sensitive proteins called channelrhodopsins. 
• Channelrhodopsin-2 could open within about 0.2 milliseconds when exposed to light. 
• They also showed that introducing the relevant gene into mammalian cells could make those cells respond to light. 
• At Stanford University, Karl Deisseroth realised that this discovery could be used to control specific groups of neurons. 
• His team demonstrated the technique in animal neurons and later used light to activate selected neurons in living mice. 
• The term “optogenetics” came into use in 2006. 

Significance

• Optogenetics has enabled researchers to study specific brain circuits linked to Memory, Emotions, Behaviour, Movement, Pain, Attention, Sleep, Social behaviour. 
• It has improved research on conditions such as schizophrenia, depression, Alzheimer’s and Parkinson’s diseases. 
• The technique is also being explored for restoring vision and hearing. 
• In one experimental approach, light-sensitive proteins were introduced into the retina of a blind person, helping restore limited visual functions. 

Nobel Prize

• Alfred Nobel was a Swedish inventor, scientist, entrepreneur and businessman. He also wrote poetry and drama. 
• He established the Nobel Prizes through his will in 1895. 
• Nobel is best known for inventing dynamite and held 355 patents. 
• The first Nobel Prizes were awarded in 1901. They have generally been awarded annually, except in some years, particularly during the World Wars. 
• 10 December, the anniversary of Alfred Nobel’s death, is observed as Nobel Day, when the prizes are presented. 

Nobel Prize Categories

The original five categories mentioned in Nobel’s will were:

1. Physics 
2. Chemistry 
3. Physiology or Medicine 
4. Literature 
5. Peace 

• In 1968, Sweden’s central bank established the Sveriges Riksbank Prize in Economic Sciences in Memory of Alfred Nobel. 
• It is not an original Nobel Prize category and was created separately from Nobel’s will. 
• There are no Nobel Prizes specifically for Mathematics, Engineering, Biology or Environmental Science. 

Important Facts

• A Nobel Prize consists of a medal, diploma and prize money. 
• A prize can generally be shared by up to three individuals. 
• The Nobel Prize is not normally awarded posthumously. However, if a laureate dies after the announcement, the prize can still be awarded. 
• Self-nomination is not allowed; candidates must be nominated by eligible nominators. 
• Malala Yousafzai became the youngest Nobel laureate when she received the Peace Prize in 2014 at the age of 17. 
• John B. Goodenough was the oldest Nobel laureate at the time of his Chemistry Prize in 2019, at the age of 97. 
• Marie Curie is the only person to have received Nobel Prizes in two different scientific categories: Physics (1903) and Chemistry (1911).

Q. With reference to the 2026 Nobel Prize in Physiology or Medicine and optogenetics, consider the following statements:

1. Optogenetics combines genetic methods with light to regulate the electrical activity of selected neurons. 
2. The discovery of channelrhodopsins demonstrated that light-sensitive proteins could make mammalian cells responsive to light. 
3. The Economic Sciences prize is one of the five original Nobel Prize categories specified in Alfred Nobel’s will. 
4. The Nobel Prize can be shared by more than three individuals when the award is given for a scientific discovery. 

Which of the statements given above are incorrect?

(a) 1 and 2 only
(b) 1, 2 and 3 only
(c) 3 and 4 only
(d) 1, 2, 3 and 4

Answer: (c) 3 and 4 only

Explanation

• Optogenetics combines genetic methods and light to control selected neurons by changing their electrical activity. Hence, Statement 1 is Correct. 
• Hegemann and Nagel showed that introducing the gene for a light-sensitive protein into mammalian cells could make them respond to light. Hence, Statement 2 is Correct. 
• The Economic Sciences prize was established by Sweden’s central bank in 1968 and was not part of Alfred Nobel’s original five categories. Hence, Statement 3 is Incorrect.
• A Nobel Prize can generally be shared by a maximum of three individuals. Hence, Statement 4 is Incorrect.

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