X-linked neuronal migration disorders: Gender differences and insights for genetic screening

Area of Science:

• Neuroscience
• Genetics
• Developmental Biology

Background:

• Neuronal migration disorders (NMDs) are characterized by cortical defects, leading to neurocognitive impairment, developmental delay, and seizures.
• Cortical developmental disorders account for 25% of childhood epilepsy cases, but their epidemiology and causes are poorly understood.
• X-linked NMDs, often familial, include conditions like lissencephaly, periventricular nodular heterotopia, and polymicrogyria.

Purpose of the Study:

• To review X-linked neuronal migration disorders (NMDs), focusing on their genetic basis and pathophysiology.
• To highlight prominent genes involved in X-linked NMDs, such as DCX, ARX, FLNA, FMR1, L1CAM, SRPX2, DDX3X, NSHDL, CUL4B, and OFD1.
• To emphasize the clinical significance of recognizing X-linked NMDs, particularly the milder phenotypes in females and their reproductive implications.

Main Methods:

• Literature review of X-linked neuronal migration disorders.
• Analysis of genetic mutations and their associated pathophysiological mechanisms.
• Summary of current knowledge on gene prevalence and function in NMDs.

Main Results:

• Identified key genes (DCX, ARX, FLNA, etc.) implicated in X-linked NMDs.
• Outlined the pathophysiology underlying these genetic mutations.
• Noted that females often exhibit milder phenotypes, increasing survival to reproductive age and potential for transmission.

Conclusions:

• X-linked NMDs are crucial to recognize due to their familial inheritance and potential for milder phenotypes in females.
• Understanding gene mutations and functions is vital for effective genetic screening, prevention, and treatment.
• This review provides a knowledge base and directions for future research in NMDs for scientists and clinicians.