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Updated: May 23, 2026

Dissecting Cell-Autonomous Function of Fragile X Mental Retardation Protein in an Auditory Circuit by In Ovo Electroporation

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Age-dependent structural connectivity effects in fragile x premutation.

Jun Yi Wang¹, David H Hessl, Randi J Hagerman

¹Departments of Psychiatry and Behavioral Sciences, University of California–Davis, Sacramento, CA, USA.

Archives of Neurology

|April 12, 2012

Summary

This summary is machine-generated.

Fragile X premutation alleles impact brain connectivity in males, especially those with fragile X-associated tremor/ataxia syndrome (FXTAS). Diffusion tensor imaging reveals widespread white matter changes in affected individuals, with subtle alterations in unaffected carriers.

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Area of Science:

Neuroscience
Genetics
Radiology

Background:

Fragile X premutation alleles are associated with an increased risk of developing fragile X-associated tremor/ataxia syndrome (FXTAS) in males.
Individuals with premutation alleles may experience subtle cognitive, social, and emotional disturbances prior to clinical manifestation of FXTAS.

Purpose of the Study:

To investigate the effects of fragile X premutation alleles on major brain fiber tracts in males.
To assess structural connectivity changes in relation to FXTAS and age.

Main Methods:

Cross-sectional study involving younger and older male carriers of fragile X premutation alleles, older unaffected carriers, and age-matched controls.
Diffusion tensor imaging (DTI) was used to reconstruct and quantify eleven major fiber tracts.
Tract-based spatial statistics were applied to analyze white matter integrity.

Main Results:

Younger carriers showed accelerated age-related connectivity decline in the extreme capsule.
Older unaffected carriers had no significant structural alterations.
Older carriers with FXTAS exhibited connectivity loss in 5 tracts, greater age-related decline in all 11 tracts, and increased white matter variability in 9 tracts.

Conclusions:

Fragile X premutation alleles lead to widespread structural connectivity alterations in males with FXTAS.
Unaffected carriers show preserved or subtle changes in white matter connectivity.
DTI is a sensitive tool for detecting white matter pathology in FXTAS.