ABCA13 dysfunction associated with psychiatric disorders causes impaired cholesterol trafficking

Area of Science:

• Biochemistry
• Neuroscience
• Genetics

Background:

• ATP-binding cassette subfamily A member 13 (ABCA13) is the largest ABC protein, implicated in psychiatric disorders.
• Its precise molecular functions and role in these conditions remain largely unknown.

Purpose of the Study:

• To investigate the biochemical activity and physiological roles of ABCA13.
• To understand how ABCA13 dysfunction contributes to psychiatric disorder pathophysiology.

Main Methods:

• HEK293 cells were transfected with mouse ABCA13 to assess its biochemical activity.
• CRISPR/Cas9 was used to generate Abca13 knockout (KO) mice for physiological studies.
• Primary cortical neuron cultures from Abca13 KO mice were analyzed.

Main Results:

• ABCA13 expression induced cholesterol and ganglioside internalization, dependent on its N-terminal region and ATP hydrolysis.
• Abca13 KO mice showed prepulse inhibition deficits.
• Impaired vesicular cholesterol accumulation and synaptic vesicle endocytosis were observed in Abca13 KO neurons.
• Mutations linked to psychiatric disorders disrupted ABCA13 localization and cholesterol trafficking.

Conclusions:

• ABCA13 facilitates cholesterol internalization via endocytic retrograde transport in neurons.
• Loss of ABCA13 function contributes to the pathophysiology of psychiatric disorders.