Sex Difference in Spinal Muscular Atrophy Patients - are Males More Vulnerable?

Area of Science:

• Neuroscience
• Genetics
• Pediatrics

Background:

• Sex is a known risk factor in neurodegenerative disorders, yet its role in spinal muscular atrophy (SMA) remains understudied.
• Understanding sex differences in SMA can inform the development of targeted therapies for improved patient outcomes.
• SMA is a leading genetic cause of infant mortality with a wide spectrum of disease severity.

Purpose of the Study:

• To systematically investigate sex differences in SMA incidence, symptom severity, and motor function across different SMA types.
• To examine sex-specific developmental patterns in SMA Type 1 patients.

Main Methods:

• Aggregated data from the TREAT-NMD Global SMA Registry and Cure SMA membership database were analyzed.
• Data were compared with publicly available standard data and published literature.

Main Results:

• A correlation between the male/female ratio and SMA incidence/prevalence was observed in certain datasets.
• Males exhibited more severe symptoms in SMA types 2 and 3b, while females showed better motor function in SMA types 1, 3a, and 3b.
• Male SMA Type 1 patients displayed a more pronounced impact on head circumference.

Conclusions:

• Certain registry data suggest males may be more vulnerable to SMA.
• Variability in findings highlights the need for further investigation into sex differences in SMA epidemiology.
• Understanding these differences is crucial for developing sex-specific, targeted SMA treatments.