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Gender Effects on the Clinical Phenotype in Japanese Patients with Spinal Muscular Atrophy.

BACKGROUND: Spinal muscular atrophy (SMA) is a neuromuscular disease caused by a mutation in SMN1. SMA is classified into three subtypes (types 1, 2, 3) based on achieved motor milestones. Although NAIP and SMN2 are widely accepted as SMA-modifying factors, gender-related modifying factors or gender effects on the clinical phenotype are still controversial.

METHODS: A total of 122 Japanese patients with SMA, of which SMN1 was homozygously deleted, were analyzed from the perspective of the achieved motor milestone, NAIP status and SMN2 copy number.

RESULTS: A predominance of male patients was observed in SMA type 3 (the walker group) without NAIP-deletion or with high SMN2 copy number (3 or 4 copies).

CONCLUSION: We suggest the presence of gender-related modifiers on disease severity in SMA patients. The modifiers may contribute only in the presence of NAIP and a high copy number of SMN2.

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