A sex-specific switch in a single glial cell patterns the apical extracellular matrix

Area of Science:

• Cell biology
• Developmental biology
• Neuroscience

Background:

• The apical extracellular matrix (aECM) forms a crucial interface between tissues and their environment.
• The mechanisms underlying the diverse, tissue-specific patterning of the aECM remain largely unknown.

Approach:

• Investigated a male-specific genetic switch in a single C. elegans glial cell.
• Identified key genetic regulators, including shared neuronal-glial factors (mab-3, lep-2, lep-5) and potentially glia-specific factors (nfya-1, bed-3, jmjd-3.1).
• Examined the role of male-specific Hedgehog-related protein GRL-18 in aECM pore formation.

Key Points:

• A male-specific genetic switch in a glial cell patterns the aECM into a ~200 nm pore.
• This pore enables a male sensory neuron to access the external environment.
• Male-specific expression of GRL-18 localizes to nanoscale rings at pore formation sites.

Conclusions:

• A single glial cell's gene expression switch is necessary and sufficient for aECM structural patterning.
• This mechanism provides a novel insight into how cellular communication shapes tissue interfaces.
• The findings highlight the role of glia in regulating neuronal access to the environment via aECM modification.