Sex-Specific ADHD-like Behaviour, Altered Metabolic Functions, and Altered EEG Activity in Sialyltransferase...

Area of Science:

• Neuroscience
• Biochemistry
• Genetics

Background:

• Gangliosides are crucial for brain development and function.
• Deficiency in ST3GAL5 enzyme impairs GM3-derived ganglioside production, linked to neuropathology.
• Previous studies showed ST3GAL5 knockout mice lack specific gangliosides without overt neurological issues.

Purpose of the Study:

• To investigate if ST3GAL5 knockout mice exhibit attention-deficit/hyperactivity disorder (ADHD)-like behaviors.
• To evaluate metabolic and electroencephalogram (EEG) abnormalities in these mice.
• To explore the role of brain gangliosides in ADHD and related conditions.

Main Methods:

• Behavioral testing (locomotor activity, impulsivity, neophobia, anxiety).
• Glucose tolerance tests and measurement of insulin receptor (IR) isoforms.
• Electroencephalogram (EEG) analysis.

Main Results:

• ST3GAL5 knockout mice displayed hyperactivity, impulsivity, neophobia, and anxiety.
• Altered blood glucose levels, glucose tolerance, and sex-biased differences in body mass and peripheral IR expression were observed.
• EEG analysis revealed increased amplitude in ST3GAL5 knockout mice.

Conclusions:

• ST3GAL5 knockout mice exhibit a phenotype consistent with ADHD-like behaviors.
• These mice present with metabolic and EEG abnormalities, offering a model for studying ganglioside function in ADHD.
• Findings highlight the potential contribution of brain gangliosides to ADHD and its comorbidities.