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Huntington Disease l: Introduction

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Huntington disease or HD is a progressive, fatal neurodegenerative disorder inherited in an autosomal dominant pattern.PathophysiologyIt is caused by expansion of the CAG trinucleotide repeat in the HTT gene on chromosome 4 (4p16.3), producing an abnormal huntingtin protein with an expanded polyglutamine tract. This misfolded protein disrupts cellular function, leading to neuronal death. Normal alleles have ≤26 repeats, 27–35 are intermediate (risk of expansion), 36–39 show reduced penetrance,...

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Related Experiment Video

Updated: May 11, 2026

Efficient and Scalable Production of Full-length Human Huntingtin Variants in Mammalian Cells using a Transient Expression System

Efficient and Scalable Production of Full-length Human Huntingtin Variants in Mammalian Cells using a Transient Expression System

Published on: December 10, 2021

Huntington's disease in children.

Derek Letort¹, Pedro Gonzalez-Alegre

¹Division of Movement Disorders, Department of Neurology, Carver College of Medicine, University of Iowa, Iowa City, IA, USA.

Handbook of Clinical Neurology

|April 30, 2013

Summary

Pediatric Huntington's disease (HD) presents unique challenges, with varying symptoms based on age of onset. This review details diagnostic features, genetic testing, and symptomatic treatments for childhood and adolescent HD.

Area of Science:

Neuroscience
Genetics
Neurology

Background:

Huntington's disease (HD) is a fatal, dominantly inherited neurodegenerative disorder.
It typically manifests in adulthood with movement, cognitive, and psychiatric symptoms.
A subset of patients experience pediatric onset, presenting distinct clinical characteristics.

Purpose of the Study:

To discuss the characteristics of childhood- and adolescence-onset HD.
To highlight differential clinical features aiding diagnosis in pediatric HD.
To review genetic testing indications and symptomatic treatment options.

Main Methods:

Review of clinical features in pediatric Huntington's disease.
Analysis of diagnostic challenges based on age of onset.

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Last Updated: May 11, 2026

Efficient and Scalable Production of Full-length Human Huntingtin Variants in Mammalian Cells using a Transient Expression System

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Published on: December 10, 2021

Fractionation for Resolution of Soluble and Insoluble Huntingtin Species

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Published on: February 27, 2018

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Published on: January 22, 2017

Summary of current genetic testing guidelines and therapeutic strategies.

Main Results:

Pediatric HD exhibits varied clinical presentations, particularly in younger patients.
The Westphal variant, characterized by parkinsonism, is common in early-onset HD.
Diagnostic difficulties are noted, necessitating careful clinical evaluation.

Conclusions:

Understanding age-dependent clinical features is crucial for diagnosing pediatric HD.
Genetic testing plays a key role in confirming the diagnosis.
Symptomatic treatments are available to manage the diverse manifestations of pediatric HD.