Werner syndrome: a model for sarcopenia due to accelerated aging

Area of Science:

• Gerontology
• Genetics
• Metabolic Diseases

Background:

• Werner syndrome (WS) is a rare genetic disorder characterized by premature aging.
• WS is linked to mutations in the WRN gene, affecting DNA repair.
• Limited data exists on body composition and mobility changes in WS patients.

Purpose of the Study:

• To precisely describe body composition, including muscle and fat mass.
• To evaluate mobility and functional status in individuals with Werner syndrome.
• To investigate age and sex-specific differences in body composition and mobility in WS.

Main Methods:

• Recruited nine Japanese patients with Werner syndrome (WS).
• Assessed body composition using dual-energy X-ray absorptiometry (DXA) and computed tomography (CT).
• Evaluated hand grip strength and mobility via the two-step test, stand-up test, and Geriatric Locomotive Function Scale (GLFS).

Main Results:

• All WS patients met the diagnostic criteria for sarcopenia, indicated by a mean skeletal muscle index (SMI) of 4.0±0.6 kg/m².
• Sarcopenia was observed even in patients younger than 40 years.
• All participants demonstrated decreased mobility and functional capacity.

Conclusions:

• Patients with Werner syndrome experience significant muscle mass loss (sarcopenia) and reduced mobility, regardless of age (even <40 years).
• These findings underscore the profound impact of WS on musculoskeletal health.
• Further research into sarcopenia in WS may reveal novel insights and therapeutic targets for age-related muscle decline.