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Related Experiment Videos

Polyalanine expansions in human.

Jeanne Amiel1, Delphine Trochet, Mathieu Clément-Ziza

  • 1Département de Génétique, Hôpital Necker-Enfants Malades, Paris, France. amiel@necker.fr

Human Molecular Genetics
|September 11, 2004
PubMed
Summary
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Expanded polyalanine (polyA) stretches, like polyglutamine, are increasingly linked to congenital diseases. This review explores evidence suggesting homopolymeric tract expansions cause various human disorders.

Area of Science:

  • Genetics and Molecular Biology
  • Human Disease Mechanisms
  • Protein Structure and Function

Background:

  • Polyglutamine (PolyQ) expansions are established causes of neurodegenerative disorders.
  • Recent research implicates polyalanine (PolyA) expansions in congenital malformations, skeletal dysplasia, and nervous system anomalies.
  • Approximately 500 human proteins contain PolyA stretches, with nine linked to disease phenotypes upon expansion.

Purpose of the Study:

  • To review emerging evidence on the role of PolyA expansions in human diseases.
  • To explore the hypothesis that homopolymeric tract expansions share a common disease-causing mechanism.
  • To consolidate findings on the pathological impact of expanded polyalanine stretches.

Main Methods:

  • Literature review of recent scientific findings.

Related Experiment Videos

  • Analysis of genetic data linking polyalanine expansions to disease phenotypes.
  • Comparative analysis of polyglutamine and polyalanine expansion mechanisms.

    • Main Results:

    • Growing evidence supports polyalanine expansions as a pathogenic mechanism.
    • Nine human proteins with expanded polyalanine tracts are associated with specific disease phenotypes.
    • The functional significance of polyalanine stretches remains largely undetermined.

    Conclusions:

    • Polyalanine expansions represent a significant, under-recognized cause of human congenital and developmental disorders.
    • Homopolymeric tract expansions, regardless of the amino acid, may share common pathological pathways.
    • Further research is needed to elucidate the function of polyalanine stretches and their role in disease.