Dinosaurs and the mammal longevity gap, Evolutionary Biology - Guest Associate Professor Molly Burke

The Longevity Bottleneck Hypothesis, DNA repair mechanisms, and the evolutionary shadows cast by the Mesozoic Era lead our journey into why mammals age the way they do. We dive into a provocative theory suggesting that 150 million years of being "dino-snacks" might have permanently shortened our ancestral lifespans.

Dr. Molly Burke, an evolutionary biologist from Oregon State University, joins the show to explain how natural selection acts like a "tuner" for longevity. We discuss experimental evolution using fruit flies and yeast, exploring how shifting the age of reproduction can increase or decrease lifespan in just a few generations.

Topics

The Mesozoic Bottleneck: Hypothesis that early mammals lost long-life genes because rapid reproduction was the only way to survive

Experimental Evolution: How scientists study evolution by subjecting model organisms to specific environmental pressures

Senescence & Natural Selection: Defining aging as a decline in physiology and why natural selection "stops caring" once we’ve finished reproducing.

Genetic Drift vs. Selection: Understanding how random chance can cause beneficial traits (eg., DNA repair) to disappear

Orthologs: Why messing with a fruit fly's genes can tell us something profound about human biology.

Chapters

(00:00) Bad Puns and Mesozoic Beginnings

(01:30) Mammals: From Shrews to Humans

(02:45) Longevity Bottleneck: Blaming Dinos

(04:00) "Biodegraded" Biology Jokes

(05:15) Evolution in Real Time with Dr. Molly Burke

(08:00) Evolutionary Pressure and Genetic Drift

(09:45) A, G, C, T: Four Letters of Your Blueprint

(11:15) Fruit Flies and Yeast are Scientific Rockstars

(15:30) Cloning vs. Diversity: Evolution Experiments

(18:45) Anti-Aging: Cryotherapy to Donkey Milk

(22:00) Senescence: Why Our Bodies Break Down

(23:45) Longevity and Postponing Reproduction

(27:00) Speed Evolution: 2 x Lifespans in 10 Generations

(30:00) Orthologs: Connecting Fly Genes to Humans

(32:45) Possum Study: Predators and Life Expectancy

(36:00) Asimov’s "That’s Funny": Best Phrase in Science

Links

The longevity bottleneck hypothesis: Could dinosaurs have shaped ageing in present-day mammals?” João Pedro de Magalhães

https://ib.oregonstate.edu/directory/molly-k-burke

Email: whimsical.wavelengths@gmail.com

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Whimsical Wavelengths: Deep-dive conversations where a working scientist unpacks how we know what we know, one paper, one idea, or whimsical detour at a time. Hosted by Dr. Jeffrey Zurek (P.Geo)