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Related Experiment Videos

Trinucleotide repeat expansion and human disease

C T Ashley1, S T Warren

  • 1Department of Biochemistry, Emory University School of Medicine, Atlanta, Georgia 30322, USA.

Annual Review of Genetics
|January 1, 1995
PubMed
Summary
This summary is machine-generated.

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Trinucleotide repeat expansions cause genetic disorders. These mutations, often lengthening during transmission, explain disease severity variations and anticipation in affected families.

Area of Science:

  • Genetics
  • Molecular Biology
  • Human Disease

Background:

  • Eleven human genetic loci are associated with nine distinct diseases.
  • These diseases are characterized by an unusual mutation type: trinucleotide repeat expansions.

Purpose of the Study:

  • To investigate the nature and implications of trinucleotide repeat expansions in human genetic disorders.
  • To correlate repeat length variations with disease phenotypes and inheritance patterns.

Main Methods:

  • Analysis of polymorphic CGG/CCG and CAG/CTG repeats at specific human loci.
  • Quantification of repeat lengths, comparing normal polymorphic ranges with expanded alleles.
  • Examination of the meiotic stability and transmission patterns of expanded alleles.

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Main Results:

  • Trinucleotide repeats expand to 2-3 or 10-1000 times normal lengths.
  • Smaller expansions in polyglutamine genes link to neurodegenerative diseases.
  • Larger expansions associate with fragile sites or untranslated gene regions.

Conclusions:

  • Expanded trinucleotide repeats exhibit significant meiotic instability, often increasing in length upon transmission.
  • Abnormal repeat lengths correlate with incomplete penetrance and variable expressivity.
  • Repeat elongation across generations explains genetic anticipation observed in these disorders.