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Figure 2.1 Developmental History of the Leopard Frog, Rana pipiens

Gametogenesis and Fertilization Unit Opportunity: Microtubules and motors Calcium mediated Membrane fusions Cell-Cell interaction – First example. Figure 2.1 Developmental History of the Leopard Frog, Rana pipiens. Gametogenesis (Germ cell specification and maturation).

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Figure 2.1 Developmental History of the Leopard Frog, Rana pipiens

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  1. Gametogenesis and FertilizationUnitOpportunity: Microtubules and motorsCalcium mediated Membrane fusions Cell-Cell interaction – First example

  2. Figure 2.1 Developmental History of the Leopard Frog, Rana pipiens

  3. Gametogenesis (Germ cell specification and maturation) • Germ line specification (g.l. stem cells first) • Germ line migration to the gonads • Meiosis • Gamete maturation

  4. Set aside as quiescent cells

  5. Gametogenesis (Germ cell specification and maturation) • Germ line specification (g.l. stem cells first) • Germ line migration to the gonads • Meiosis • Gamete maturation

  6. Mammalian

  7. Fruitfly Drosophila melanogaster

  8. Gametogenesis (Germ cell specification and maturation) • Germ line specification (g.l. stem cells first) • Germ line migration to the gonads • Meiosis • Gamete maturation

  9. Gametogenesis oogenesis spermatogenesis After fertilization, the zygote will essentially be an activated egg

  10. Frog oocyte

  11. 1. Oocytes’ massive bio-synthesis of macromolecules 2. Micro-pinocytosis – vesicle delivery from other cells

  12. Fruitfly Drosophila melanogaster

  13. Gametogenesis/Fertilization UnitOPPORTUNITY TO FOCUS ON MICROTUBULES

  14. Microtubles in mitosis/meiosis

  15. Movie1 Life of cell 2 Kinesins towards + Dyenins towards - http://biolog-e.ls.biu.ac.il/faculty/wides/80-557/movies/MCB1803ActinMyosin.MOV http://www.youtube.com/watch?v=4TGDPotbJV4 Kinesin walk

  16. Microtubles in oogenesis, creating assymetry in cytoplasm Transport via Microtubules- Assymetric placement of cytoplasmic components (RNA) Attachment later by vegetal Cortex microfilaments

  17. Figure 2.1 Developmental History of the Leopard Frog, Rana pipiens

  18. Gametogenesis spermatogenesis oogenesis

  19. First: Microtubles and the flagellum

  20. 9+2 micorotuble arrangement - in motile cilia - including most metazoans’ sperm flagella 9 dimer microtubules + 2 monomer microtubules Can see: http://www.youtube.com/watch?v=n40VTfWvh1Y

  21. http://www.youtube.com/watch?v=vQ3CdSiVzUkcilia

  22. Flagellum structure: Sperm and most eukaryotic flagella http://www.youtube.com/watch?v=5rqbmLiSkpk

  23. Centriole-> flagellum Acrosome Mitochondria to axoneme Cytoplasm

  24. Fertilization

  25. Figure 2.21 Major Evolutionary Divergences in Extant Animals

  26. Attraction of sea urchin sperm to egg in Sea water: Swimming along the gradient of the RESACT peptide

  27. Gametogenesis and FertilizationUnitOpportunity: Microtubules and motors1. Calcium mediated Membrane fusions (3) Cell-Cell interaction – First example2. Extracellular matrix (ECM) introduction

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