Three Faces of Fragile X

Area of Science:

• Genetics
• Neurology
• Physical Therapy

Background:

• Fragile X syndrome (FXS) is linked to FMR1 gene dysfunction.
• FXS is one of three fragile X-associated disorders (FXDs), including FXPOI and FXTAS.
• FXDs share a genetic defect but manifest as distinct conditions with varied impairments.

Purpose of the Study:

• Discuss the genetic basis of FMR1 gene dysfunction.
• Describe the health conditions associated with FMR1 mutations.
• Introduce physical therapy assessment and intervention strategies for FXDs.

Main Methods:

• Literature review on FMR1 gene dysfunction.
• Analysis of clinical manifestations of FXDs.
• Exploration of physical therapy's role in managing FXDs.

Main Results:

• FMR1 gene mutations cause a spectrum of FXDs.
• FXDs present with diverse impairments like motor delays, low muscle tone, ataxia, and neurodegeneration.
• Physical therapy may benefit individuals with FXDs, but evidence is limited.

Conclusions:

• Understanding FMR1 mutations is crucial for diagnosing and treating FXDs.
• Physical therapy interventions require further research for efficacy in FXDs.
• Intergenerational effects and lifespan expression of FMR1 mutations are key considerations.