Interconnected cavernous structure of bacterial fruiting bodies

Area of Science:

• Microbiology
• Developmental Biology
• Biophysics

Background:

• Myxobacteria exhibit multicellular self-organization, forming spore-filled fruiting bodies.
• Studied as models for collective motion and developmental morphogenesis.
• Sporulation requires cell signaling for timely differentiation.

Purpose of the Study:

• Investigate the internal structure of myxobacteria fruiting bodies.
• Elucidate the mechanism behind spore density pocket formation.
• Integrate experimental and computational approaches for pattern formation insights.

Main Methods:

• Infrared Optical Coherence Tomography (OCT) for 3D imaging.
• Computer simulations and modeling to test hypothesized mechanisms.
• Analysis of cell-cell signaling and collective motion.

Main Results:

• OCT revealed interconnected pockets of high and low spore density within fruiting bodies.
• Simulations supported a mechanism of self-propelled cells aligning and signaling via end-to-end contact.
• This mechanism explains the observed clustered spore pattern.

Conclusions:

• Novel OCT imaging provides unprecedented detail of M. xanthus fruiting body structure.
• A signaling-driven mechanism explains the formation of spore density patterns.
• Findings offer insights applicable to other self-organizing biological systems.