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Related Experiment Videos

The fragile X premutation: into the phenotypic fold.

Randi J Hagerman1, Paul J Hagerman

  • 1The MIND Institute and Department of Pediatrics, University of California, Davis, Medical Center, Sacramento, California 95817, USA. randi.hagerman@ucdmc.ucdavis.edu

Current Opinion in Genetics & Development
|June 22, 2002
PubMed
Summary

Fragile X premutation alleles in the FMR1 gene are linked to genetic instability and distinct clinical issues. Research shows these premutation alleles directly cause symptoms like premature ovarian failure and tremor/ataxia syndrome.

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Psychiatric and Cognitive Features in Italian Women With the FMR1 Premutation: A Comprehensive Assessment Using SCID-5 and Standardized Cognitive Measures.

American journal of medical genetics. Part B, Neuropsychiatric genetics : the official publication of the International Society of Psychiatric Genetics·2026

Area of Science:

  • Genetics
  • Neuroscience
  • Reproductive Biology

Background:

  • Fragile X mental retardation 1 (FMR1) gene premutation alleles (55-200 CGG repeats) are associated with genetic instability.
  • These alleles can transmit full mutations (>200 repeats), leading to the classic fragile X phenotype.
  • Emerging evidence suggests premutation alleles themselves cause clinical manifestations.

Purpose of the Study:

  • To investigate the direct clinical impact of FMR1 gene premutation alleles.
  • To explore the association between premutation alleles and specific syndromes.
  • To examine the role of FMR1 gene dysregulation in premutation carriers.

Main Methods:

  • Analysis of FMR1 gene CGG repeat counts.
  • Clinical assessment of carriers for fragile X-associated disorders.

Related Experiment Videos

  • Molecular studies to evaluate FMR1 gene expression and regulation.

    • Main Results:

    • Premutation alleles are linked to premature ovarian failure in female carriers.
    • A tremor/ataxia syndrome is observed in older male carriers of premutation alleles.
    • Evidence indicates dysregulation of the FMR1 gene in the premutation range.

    Conclusions:

    • FMR1 gene premutation alleles have direct pathogenic effects.
    • These alleles contribute to distinct clinical phenotypes beyond transmitting full mutations.
    • Gene dysregulation in the premutation range is a key mechanism for observed symptoms.