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Huntington's disease and Huntington's disease-like syndromes: an overview

Felix Gövert1, Susanne A Schneider

  • 1Department of Neurology, Christian-Albrechts-University Kiel, University-Hospital-Schleswig-Holstein, Kiel Campus, Schittenhelmstrasse 10, Kiel, Germany.

Current Opinion in Neurology
|July 2, 2013
PubMed

Insights

Diagnosing rare Huntington's disease-like (HDL) phenotypes can be challenging due to overlapping symptoms with Huntington's disease. Advances in genetics are improving molecular diagnoses and paving the way for new therapies.

Area of Science:

  • Neurology
  • Genetics
  • Rare Diseases

Background:

  • Chorea syndromes present complex differential diagnoses, including Huntington's disease and similar Huntington's disease-like (HDL) phenotypes.
  • These rare HDL disorders account for approximately 1% of cases with a Huntington's disease phenotype.
  • Clinical diagnosis is challenging due to overlapping features, necessitating genetic work-up.

Purpose of the Study:

  • To familiarize clinicians with the main characteristics of rare chorea syndromes, including HDL phenotypes.
  • To highlight key diagnostic clues and ethnic considerations for specific genetic disorders.
  • To provide an overview of the current understanding and diagnostic approaches for these conditions.

Main Methods:

  • Review of clinical characteristics of Huntington's disease and HDL phenotypes.
  • Analysis of genetic underpinnings and diagnostic challenges.
  • Consideration of ethnic variations influencing genetic diagnosis.

Main Results:

  • HDL disorders are rare, mimicking Huntington's disease phenotype.
  • Specific clinical features (e.g., orofacial involvement in neuroferritinopathy) and ethnic background (e.g., HDL2 in Black Africans, DRPLA in Japanese) aid diagnosis.
  • Many HDL disorders and related conditions like DRPLA are repeat disorders with anticipation effects.

Conclusions:

  • Genetic advancements are enabling molecular diagnoses for an increasing number of chorea patients.
  • Improved understanding of pathophysiology is crucial for developing targeted mechanistic therapies.
  • Further research into rare genetic disorders is essential for improved patient outcomes.
Abstract

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