DISC1 immunoreactivity at the light and ultrastructural level in the human neocortex

Area of Science:

• Neuroscience
• Genetics
• Cell Biology

Background:

• Disrupted-In-Schizophrenia 1 (DISC1) gene is linked to schizophrenia risk.
• DISC1 is found in mammalian brains, but its localization in human neocortex is unstudied.
• Immunocytochemistry is a key technique for visualizing protein distribution.

Purpose of the Study:

• To investigate the anatomical localization of DISC1 in the normal human neocortex using immunocytochemistry.
• To elucidate the cellular and subcellular distribution of DISC1.
• To infer the functional roles of DISC1 based on its localization.

Main Methods:

• Immunocytochemical analysis of DISC1 in human frontal and parietal cortex (BAs 4, 9, 39, 46).
• Light and electron microscopy to examine DISC1 immunoreactivity.
• Identification of labeled cellular structures and synapses.

Main Results:

• DISC1 immunoreactivity was prominent in the neuropil, various cell populations, and white matter.
• At the ultrastructural level, DISC1 was found in synaptic structures, including axon terminals and postsynaptic densities.
• Labeled axon terminals formed asymmetric and symmetric synapses with dendrites and spines.
• DISC1 was also localized in ribosomes, chromatin, dendritic shafts, and microtubules.
• Absence of staining in the Golgi apparatus and multivesicular bodies was noted.

Conclusions:

• DISC1 is present in diverse synaptic types, suggesting involvement in corticocortical and thalamocortical connections.
• The localization indicates DISC1's participation in synaptic activity and microtubule function.
• These findings align with existing data on DISC1's adult functions.