RAB35 is required for murine hippocampal development and functions by regulating neuronal cell distribution

Area of Science:

• Neuroscience
• Developmental Biology
• Cell Biology

Background:

• Rab35 is a small GTPase involved in cellular processes like endocytosis and cytokinesis.
• Its specific role in mammalian development and neurological function is not well understood.

Purpose of the Study:

• To investigate the physiological functions of Rab35 during mammalian development.
• To determine the impact of Rab35 deficiency on brain structure and behavior.

Main Methods:

• Generation of Rab35-knockout mice, including brain-specific knockouts.
• Analysis of embryonic development, hippocampal and cerebral cortex formation.
• Behavioral tests for spatial memory and anxiety.
• Quantitative proteomics to identify affected molecular pathways.

Main Results:

• Rab35 is essential for early embryogenesis.
• Brain-specific Rab35 knockout mice show severe hippocampal lamination defects due to impaired pyramidal neuron distribution.
• These mice exhibit deficits in spatial memory and altered anxiety-related behaviors.
• Loss of Rab35 affects levels of other RAB proteins and neural cell adhesion molecules like contactin-2.

Conclusions:

• Rab35 plays a critical role in the precise neuronal distribution within the developing hippocampus.
• Regulation of cell adhesion molecules by Rab35 is key to its function in hippocampal development.
• Rab35 deficiency impacts neuronal organization, leading to cognitive and behavioral deficits.