EP47: Egg Activation: Molecular Mechanisms with Dr. Mariana Wolfner

The Future Conceived

The Future Conceived
EP47: Egg Activation: Molecular Mechanisms with Dr. Mariana Wolfner
Nov 20, 2025 Episode 47
SSR Podcast

Join host Cameron A. Schmidt, PhD, as he kicks off a new series celebrating the vital role of the egg in sexual reproduction. This episode features a conversation with pioneering developmental biologist Dr. Mariana Wolfner of Cornell University.

Dr. Wolfner has spent nearly fifty years utilizing the powerful genetics of the vinegar fly, Drosophila melanogaster, to dissect the fundamental mechanisms guiding sex determination and development, spanning from genetics and molecular biology to evolutionary development.

Key Topics in this Episode:

  • The Power of Model Organisms: Discover why Drosophila is an indispensable tool for uncovering conserved biological mechanisms shared across diverse species, including mammals.
  • Defining Conservation: Dr. Wolfner explores the difference between biochemical functional conservation and developmental functional conservation in evolutionary biology.
  • The Mystery of Egg Activation: Learn about this critical, yet poorly understood, process where a terminally differentiated egg transitions into a totipotent cell capable of creating an entire organism.
    • The Calcium Signal: Discuss the pivotal role of calcium in triggering activation and how the initiating impulse differs between organisms like mammals (sperm-delivered enzyme) and insects (mechanical/environmental cues upon ovulation).
  • Sexual Conflict and Cooperation: An updated perspective on the role of male accessory gland secretions (seminal fluid) and how molecules transferred during mating influence female physiology and behavior, challenging older interpretations of sexual conflict in favor of a more nuanced view of cooperation and cross-talk between the sexes.

This discussion offers a fascinating look at how small-scale molecular events ultimately inform large-scale developmental and evolutionary phenomena.

Episode Artwork EP47: Egg Activation: Molecular Mechanisms with Dr. Mariana Wolfner 1:09:14 Episode Artwork E46: Fuller W. Bazer Award with Marcella Pecora Milazzotto 18:23 Episode Artwork EP45: Sperm Capacitation: Intelligent Motion with Dr. Meisam Zaferani 57:18 Episode Artwork EP44: Alternative Careers in Reproductive Biology: Dr. Eglė Ortega, Senior Embryologist at Fertility Institute of Hawaii 21:18 Episode Artwork EP43: Sperm Capacitation: Energy Metabolism with Dr. Melanie Balbach 1:18:28 Episode Artwork E42: Sperm Capacitation: Molecular Mechanisms with Dr. Pablo Visconti 1:47:02 Episode Artwork EP 41: 2025 Training Mentoring Award Interview with Marisa Bartolomei 48:14 Episode Artwork EP 40: What's New at BOR? Expanded Scope, Special Issues, and More! 29:52 Episode Artwork EP 39: Interview with 2024 Roger V Short Medal Awardee Dr. Francesca Duncan 42:51 Episode Artwork EP 38: Interview with 2024 SSR Jansen Distinguished Leadership and Service Award Winner Dr. Katherine Loveland 43:54 Episode Artwork EP 37: Interview with 2024 Carl G. Hartman Award Winner Dr. Francesco DeMayo 42:34 Episode Artwork EP 36: Interview with 2024 Fuller W. Bazer SSR International Scientist Award Winner Islam Saadeldin 19:40 Episode Artwork EP 35: Interview with 2024 Janice Bahr Junior Scientist Travel Award Winner, Dr. Xiaoqiu Wang 18:47 Episode Artwork EP 34: Interview with 2024 SSR New Investigator Award Winner, Dr. Shuo Xiao 27:16 Episode Artwork EP 33: Interview with 2024 SSR Trainee Mentoring Award Winner, Dr. Paula Cohen 19:08 Episode Artwork EP 32: Fertility Studies and Reproductive Management in Cheetahs Part II 42:27 Episode Artwork EP 31: Challenging Scientific Dogma with Greg Johnson and Ky Pohler 33:27 Episode Artwork EP 30: Interview with 2024 SSR Research Award Winner, Dr. John Davis 14:13 Episode Artwork EP 29: Interview with 2023 Carl G. Hartman Award Winner, Dr. Bruce Murphy 23:16 Episode Artwork EP 28: Interview with 2023 Roger V Short Medal Winner, Dr. Niamh Forde 13:09 Episode Artwork EP 27: The world’s first successful IVF in white rhino, interview with Dr. Thomas Hildebrandt 33:05 Episode Artwork EP 26: Interview with Dr. Joy Pate, the 2021 Trainee Mentoring Awardee 22:10 Episode Artwork EP 25: Interview with 2023 SSR Jansen Distinguished Service Award Winner Mark Mirando 36:07 Episode Artwork EP 24: Interview with 2023 Virendra B. Mahesh New Investigator Award Winner Dr. Ahmed Balboula 16:10 Episode Artwork EP 23: Interview with 2023 Fuller W Bazer SSR International Scientist Awardee, Dr. Hefeng Huang 9:09