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Related Experiment Videos

Direct DNA testing for fragile X syndrome

F J Ramos1, D L Eunpu, B Finucane

  • 1Department of Pediatrics, Albert Einstein Medical Center, Philadelphia, PA.

American Journal of Diseases of Children (1960)
|November 1, 1993
PubMed
Summary

Researchers identified amplified CGG repeats in the FMR-1 gene, aiding fragile X syndrome diagnosis. This study analyzed 396 individuals, clarifying carrier status and mutation risks for at-risk families.

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Area of Science:

  • Genetics and Molecular Biology
  • Human Genetics
  • Neurodevelopmental Disorders

Background:

  • Fragile X syndrome is linked to amplified trinucleotide (cytosine guanine guanine) repeats in the FMR-1 gene.
  • Understanding mutation status is crucial for at-risk individuals and families.
  • Previous risk assessments relied on linkage analysis, which can be ambiguous.

Purpose of the Study:

  • To investigate the prevalence and characteristics of FMR-1 gene mutations in a large cohort.
  • To evaluate the utility of trinucleotide repeat analysis for diagnosing fragile X syndrome.
  • To re-evaluate and clarify carrier status and genetic risk assessments.

Main Methods:

  • Analysis of trinucleotide (cytosine guanine guanine) repeat expansions in the FMR-1 gene.

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  • Restriction fragment size analysis (delta) to quantify repeat amplification.
  • Study included 396 patients and 35 normal controls, encompassing individuals with and without family history.

    • Main Results:

    • Full mutation (≥500 bp increase) observed in all cytogenetically positive males and females.
    • Premutation (100-500 bp increase) identified in normal obligate carrier females.
    • Identified full mutations in 2.2% of mentally impaired patients without a family history and premutations in males and females with unknown family history.

    Conclusions:

    • Trinucleotide repeat analysis of the FMR-1 gene is effective for diagnosing fragile X syndrome.
    • This method allows for unambiguous determination of carrier status and genetic risk.
    • The findings aid in refining risk assessments for families affected by fragile X syndrome.