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[Triple expansion diseases: a new mutational concept].

D F Schorderet1

  • 1Division autonome de génétique médicale, CHUV, Lausanne. Daniel.Schorderet@chuv.hospvd.ch

Revue Medicale De La Suisse Romande
|March 26, 1999
PubMed
Summary

Genetic mutations, specifically triplet expansion, can cause serious diseases. This article explains triplet expansion mutations and highlights three pediatric conditions: fragile X syndrome, myotonic dystrophy, and Friedreich's ataxia.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Genomic Instability

Context:

  • The human genome contains coding and non-coding DNA sequences.
  • Base variations in DNA can lead to mutations or polymorphisms.
  • Triplet expansion, a type of mutation, involves the abnormal lengthening of three-base repeats.

Purpose:

  • To explain the concept of mutation by triplet expansion.
  • To present three pediatric diseases caused by triplet expansion: fragile X syndrome, myotonic dystrophy, and Friedreich's ataxia.

Summary:

  • Triplet expansion mutations are a significant cause of genetic disorders.
  • These mutations arise from genome instability and are responsible for at least twelve known diseases.
  • The article focuses on the mechanism of triplet expansion and its role in specific pediatric conditions.

Impact:

  • Understanding triplet expansion is crucial for diagnosing and potentially treating genetic diseases.
  • This mechanism is implicated in a growing number of identified disorders.
  • The research highlights the importance of studying non-coding DNA and genome instability.

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