The Yak Mutation That Could Help Repair the Brain (EP 56)

<p>What can a yak living thousands of meters above sea level teach us about repairing the human brain?</p><p>In Episode 56 of <em>From First Principles</em>, Lester Nare and Krishna Choudhary break down a new Neuron paper that traces an evolutionary adaptation found in high-altitude animals to a previously hidden pathway involved in building and repairing myelin.</p><p><strong>Summary</strong></p><ul><li>What myelin actually does and why losing it disrupts neural communication</li><li>How multiple sclerosis damages myelin and why the brain’s natural repair process eventually fails</li><li>Why oligodendrocyte precursor cells can remain present in damaged tissue without successfully rebuilding myelin</li><li>Why current therapies are better at slowing further damage than restoring what has already been lost</li><li>The challenge of getting drugs across the blood-brain barrier while maintaining target specificity</li><li>How evolutionary pharmacology has previously produced medicines from adaptations found in snakes and Gila monsters</li><li>The RETSAT Q247R variant identified in animals adapted to the hypoxic environment of the Tibetan Plateau</li><li>How researchers engineered the high-altitude variant into mice and tested its effect on myelin</li><li>The surprising discovery that neurons — rather than the myelin-producing cells themselves — generate the key repair signal</li><li>How RETSAT increases ATDR, which neurons convert into ATDRA</li><li>How ATDRA activates RXR-γ in oligodendrocyte precursor cells and promotes their differentiation</li><li>How administration of ATDR promoted remyelination across multiple preclinical models</li><li>Why the result is scientifically promising but still far from a proven human treatment</li></ul><p><strong>Featured Paper</strong></p><p><em>A gain-of-function Retsat variant from high-altitude adaptation promotes myelination via a neuronal dihydroretinoic acid-RXR-γ pathway</em><br />Neuron, 2026<br />DOI: 10.1016/j.neuron.2026.01.013</p><p><br /></p><p><strong>Explore FFP</strong>ffppod.comffppod.com/fundingffppod.com/transfersffppod.com/America250</p><p><strong>Support the show</strong>ffppod.com/donate</p><p><strong>Follow</strong>@FFPPod on X / Instagram / TikTok / Facebook</p>