Convergent evolution of squid photophores and transcriptomes
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This PhD thesis by Sabrina Pankey examines bacteriogenic photophores, light-emitting organs found in some cephalopods that evolved independently through convergent evolution. The thesis finds that while photophores evolved multiple times, the transcriptomes of convergent photophores are unexpectedly similar. It analyzes gene expression and symbiotic bacteria in photophores of distantly related squid species, finding that convergent transcriptomes are as similar as homologous traits despite the organs evolving separately, supporting the idea that molecular convergence can follow phenotypic convergence.
Convergent evolution of squid photophores and transcriptomes
- 1. Cephalopods Tale (PhD thesis of Sabrina Pankey) What are bacteriogenic photophores, what do they do? They evolved more than once in cephalopods Transcriptomes of convergent photophores are unexpectedly, predictably similar
- 2. What IfWe Could Replay the Tape
- 3. Does molecular convergence follow phenotypic convergence?
- 4. What are bacteriogenic photophores, what do they do?
- 5. Photophores of Squid House a Vibrio symbiosis
- 6. Physiological Morphological (Response to light) R-opsin Gq PLC TRP Phototransduction Genes Tong,Rosas,Oakley,Mitchell,Colley,McFall-Ngai. PNAS (2009) Transcription factors Pax6, Dac, Eya, Six Peyer, Pankey, Oakley,McFall-Ngai. Mech Dev (2014)
- 7. Bacteriogenic photophores evolved more than once.
- 8. A phylogenetic hypothesis for convergent origins
- 9. A phylogenetic hypothesis for convergent origins
- 10. Distantly related squid harboring bioluminescent symbionts
- 11. Distantly related squid harboring bioluminescent symbionts
- 12. Distantly related squid harboring bioluminescent symbionts
- 13. Distantly related squid harboring bioluminescent symbionts
- 14. Overall gene expression in convergent photophores is unexpectedly similar.
- 15. How does overall gene expression in convergent traits compare to expression in homologous traits?
- 16. Most variation in gene expression is species differences
- 17. Photophores cluster together based on gene expression
- 18. Convergent Transcriptomes as similar as Homologous Transcriptomes Pankey et al PNAS (2014)
- 19. Conclusions
- 20. A Replay of the Tape yielded remarkably similar outcomes
- 21. Does molecular convergence follow phenotypic convergence?