Nano-volume drop patterning for rapid on-chip neuronal connect-ability assays

Area of Science:

• Neuroscience
• Cell Biology
• Biotechnology

Background:

• Neuronal "connect-ability" is vital for brain function but altered in neuropathologies.
• Current methods for quantifying neuronal connections are time-consuming.
• Developing rapid assays is crucial for neuropathology research and drug development.

Purpose of the Study:

• To present and characterize a novel, rapid on-chip assay for quantifying neuronal connect-ability.
• To demonstrate the assay's sensitivity and reliability in assessing neuronal connections.
• To apply the assay to identify connect-ability defects in a mouse model of 22q11.2 deletion syndrome.

Main Methods:

• Utilizing an on-chip substrate with patterned adhesion protein spots (poly-d-lysine) at controlled inter-spot distances.
• Culturing primary rodent neurons on the patterned substrate and observing connect-ability based on inter-spot separation.
• Comparing neuronal connect-ability between wild-type and 22q11.2 deletion syndrome mouse model neurons.

Main Results:

• Neuronal connect-ability was found to be strictly dependent on the inter-spot distance on the chip.
• The on-chip assay allowed for rapid documentation of neuronal connections via simple optical read-outs.
• Connect-ability defects were successfully identified in neurons from a 22q11.2 deletion syndrome mouse model.

Conclusions:

• The novel on-chip approach provides a sensitive and reliable method for assessing neuronal connect-ability.
• This technique significantly speeds up the quantification of neuronal connections compared to traditional methods.
• The assay is validated for rapid assessment of neuronal connect-ability defects in neuropathologies, including 22q11.2 deletion syndrome.