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Nobel Prize in Medicine 2026 Explained: Optogenetics (EP 61)

Nobel Prize in Medicine 2026 Explained: Optogenetics (EP 61)

From First Principles vor 1 Monat

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How do you prove what a brain cell actually does? The 2026 Nobel
Prize in Medicine celebrates a remarkable answer: give cells a
light-sensitive protein, then switch their activity on or off with
light. In Episode 61 of From First Principles, Lester Nare and
Krishna Choudhary explain optogenetics from the ground up and trace
the discoveries of Peter Hegemann, Georg Nagel and Karl Deisseroth.
We follow the story from algae swimming toward light to
channelrhodopsins, precisely controlled neurons, and experiments
probing memory, reward and behavior. Then we explore heart-brain
connections, early attempts to restore vision, and what these
experiments can and cannot tell us. CHAPTERS 00:00 The discovery
that put brain cells under light control 02:34 Hello Internet 03:28
2026 Medicine Nobel and optogenetics 05:38 Understanding the brain
08:42 From correlation to causation 18:13 Controlling neurons with
light 21:25 Early optogenetics and the chARGe system 24:17
Light-sensitive microbial proteins 26:26 Algae and phototaxis 31:42
Discovering channelrhodopsins 34:42 Nagel and light-gated ion
channels 40:55 Controlling mammalian neurons 50:19 Expanding the
optogenetic toolkit 56:10 Neural circuits and behavior 59:02
Memory, reward and reinforcement 1:02:53 Heart rhythm and emotion
1:04:02 Beyond the brain and toward medical treatments 1:06:56
Implications and limits 1:09:10 Closing and Nobel week RESEARCH
& FURTHER READING Full paper list:
https://ffppod.com/episodes/ep61 Nobel Prize announcement and
background:
https://www.nobelprize.org/prizes/medicine/2026/summary/ Optical
control of neurons: https://doi.org/10.1038/nn1525 Memory recall in
mice: https://doi.org/10.1038/nature11028 Partial visual recovery:
https://doi.org/10.1038/s41591-021-01351-4 EDITORIAL NOTES
On-screen clarifications are included at these timestamps: 13:46
The Jennifer Aniston neuron was recorded in human patients.
Selective firing alone did not establish that it causes
recognition. 30:34 Vertebrate rhodopsin is a GPCR. In rods and
cones, light closes cGMP-gated channels and causes
hyperpolarization. 35:12 Xenopus oocytes are immature frog egg
cells, not embryos. 39:52 Calcium entry triggers neurotransmitter
release; neurotransmitters carry the signal across the synapse.
ChR2 conducts several positive ions, not just calcium. 52:17
Halorhodopsin is a light-driven chloride pump, not a channel.
1:03:18 The heart-pacing study expressed ChRmine in mouse heart
muscle cells, not neurons. Animal studies and early clinical
results are distinguished from established treatments. WATCH &
LISTEN Watch this episode: https://youtu.be/PKAYqhy8xf8 Our Nobel
predictions:
https://open.spotify.com/episode/4xuoH7WhM5svq8vEJPL3Ce Support:
https://ffppod.com/donate Contact: https://ffppod.com/contact
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