Convergent evolution of squid photophores and transcriptomes
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Transcript of Convergent evolution of squid photophores and transcriptomes
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Cephalopod’s 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
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What If…We Could “Replay the Tape””
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Does molecular convergence follow phenotypic convergence?
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What are bacteriogenic photophores, what do they do?
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Photophores of Squid House a Vibrio symbiosis
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Physiological(Response to light)Morphological
Gq
R-opsin
TRP
PLC
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)
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Bacteriogenic photophores evolved more than once.
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A phylogenetic hypothesis for convergent origins
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A phylogenetic hypothesis for convergent origins
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Distantly related squid harboring bioluminescent symbionts
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Distantly related squid harboring bioluminescent symbionts
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Distantly related squid harboring bioluminescent symbionts
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Distantly related squid harboring bioluminescent symbionts
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Overall gene expression in convergent photophores is unexpectedly similar.
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How does overall gene expression in convergent traits compare to expression in
homologous traits?
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Most variation in gene expression is species differences
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Photophores cluster together based on gene expression
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Convergent Transcriptomes as similar as Homologous Transcriptomes
Pankey et al PNAS (2014)
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Conclusions
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A ‘Replay of the Tape’ yielded remarkably similar outcomes
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Does molecular convergence follow phenotypic convergence?