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Related Experiment Videos

Rare fragile sites.

G R Sutherland1

  • 1Department of Cytogenetics and Molecular Genetics, Women's and Children's Hospital, and University of Adelaide, Adelaide, Australia. grant.sutherland@adelaide.edu.au

Cytogenetic and Genome Research
|October 4, 2003
PubMed
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Rare folate-sensitive fragile sites, like Fragile X, involve trinucleotide repeat expansions. Only Fragile X sites A and E (FRAXA and FRAXE) are clinically significant, causing intellectual disability.

Area of Science:

  • Genetics
  • Molecular Biology
  • Human Disease

Background:

  • Rare folate-sensitive fragile sites are characterized by trinucleotide repeats.
  • Trinucleotide repeat expansion is a significant mutational mechanism in genetic disorders.
  • The androgen receptor CAG repeat and Fragile X (FRAXA) were early examples of this phenomenon.

Purpose of the Study:

  • To characterize the repeat elements in rare fragile sites.
  • To understand the molecular basis of fragile sites and their associated clinical significance.
  • To differentiate between folate-sensitive and folate-insensitive fragile sites.

Main Methods:

  • Molecular characterization of repeat elements in fragile sites.
  • Analysis of trinucleotide repeat sequences.

Related Experiment Videos

  • Clinical correlation of fragile site types with intellectual disability.

    • Main Results:

    • Folate-sensitive fragile sites are predominantly CCG repeat expansions, similar to Fragile X.
    • Folate-insensitive fragile sites exhibit more complex and longer repeat elements.
    • Only FRAXA and FRAXE fragile sites are unequivocally linked to intellectual disability.

    Conclusions:

    • Trinucleotide repeat expansions are fundamental to the nature of rare fragile sites.
    • The specific repeat type (CCG) and complexity influence clinical outcomes.
    • FRAXA and FRAXE represent key examples of fragile sites with direct clinical impact on cognitive function.