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Chimeras and ConsciousnessEvolution of the Sensory Self$
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Lynn Margulis, Celeste A. Asikainen, and Wolfgang E. Krumbein

Print publication date: 2011

Print ISBN-13: 9780262015394

Published to MIT Press Scholarship Online: August 2013

DOI: 10.7551/mitpress/9780262015394.001.0001

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(p.34) (p.35) 3 Alarmones
Chimeras and Consciousness

Antonio Lazcano

Arturo Becerra

Luis Delaye

The MIT Press

This chapter addresses the significance of alarmones, analogous to plant and animal hormones. It considers the remarkable conservation of cyclic adenosine monophosphate (cAMP), a social hormone related to sensation and action. It also places the roots of sensation in alarmones. This chapter suggests that alarmones may have first appeared during an early evolutionary stage. It shows that cAMP was already present in the Last Common Ancestor (LCA). It also reveals that the genes involved in cAMP synthesis may have undergone branch-specific gene duplications, lateral transfer events, and secondary losses, and may have evolved independently in different prokaryotes.

Keywords:   alarmones, cyclic adenosine monophosphate, sensation, Last Common Ancestor, gene duplications, lateral transfer events, secondary losses, prokaryotes

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