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Related Concept Videos

Huntington Disease l: Introduction01:21

Huntington Disease l: Introduction

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,...
Parkinson's Disease: Overview01:15

Parkinson's Disease: Overview

Neurodegenerative disorders are progressive diseases that cause irreversible damage and loss to neurons in specific brain areas. Examples of these disorders include Parkinson's disease, Alzheimer's disease, Multiple Sclerosis (MS), and Amyotrophic Lateral Sclerosis (ALS). These disorders share characteristics such as proteinopathies, selective neuronal vulnerability, and a complex interplay between genetic and environmental factors. The primary therapeutic goal for these conditions is to...
Genetic Lingo01:11

Genetic Lingo

Overview
Parkinson Disease ll: Pathophysiology01:24

Parkinson Disease ll: Pathophysiology

Parkinson disease (PD) is a progressive neurodegenerative disorder primarily affecting movement, with additional non-motor features. Its pathophysiology involves complex interactions among genetic susceptibility, environmental exposures, and cellular dysfunction, including dopaminergic neuron loss, protein aggregation, and mitochondrial impairment.Selective NeurodegenerationA key feature is the degeneration of dopaminergic neurons in the substantia nigra pars compacta, leading to reduced...
Parkinson Disease l: Introduction01:24

Parkinson Disease l: Introduction

Parkinson’s disease is a chronic, progressive neurodegenerative disorder that primarily affects movement. It is characterized by motor symptoms such as resting tremors, muscle rigidity, bradykinesia (slowness of movement), and postural instability. Patients may notice hand tremors at rest, stiffness during movement, or a shuffling gait. In addition to motor features, non-motor symptoms include sleep disturbances, mood and behavioral changes, constipation, and cognitive impairment, all of which...
Pleiotropy01:33

Pleiotropy

Pleiotropy is the phenomenon in which a single gene impacts multiple, seemingly unrelated phenotypic traits. For example, defects in the SOX10 gene cause Waardenburg Syndrome Type 4, or WS4, which can cause defects in pigmentation, hearing impairments, and an absence of intestinal contractions necessary for elimination. This diversity of phenotypes results from the expression pattern of SOX10 in early embryonic and fetal development. SOX10 is found in neural crest cells that form melanocytes,...

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Related Experiment Video

Updated: Jul 10, 2026

Efficient and Scalable Production of Full-length Human Huntingtin Variants in Mammalian Cells using a Transient Expression System
10:52

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 phenocopy syndromes.

Edward J Wild1, Sarah J Tabrizi

  • 1UCL Institute of Neurology, National Hospital for Neurology and Neurosurgery, London, UK.

Current Opinion in Neurology
|November 10, 2007
PubMed
Summary

Huntington's disease phenocopy syndromes, affecting about 1% of suspected cases, present diagnostic challenges. Identifying these rare conditions aids understanding of Huntington's disease pathogenesis.

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Related Experiment Videos

Last Updated: Jul 10, 2026

Efficient and Scalable Production of Full-length Human Huntingtin Variants in Mammalian Cells using a Transient Expression System
10:52

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

Published on: December 10, 2021

Fractionation for Resolution of Soluble and Insoluble Huntingtin Species
07:08

Fractionation for Resolution of Soluble and Insoluble Huntingtin Species

Published on: February 27, 2018

Generation of Native, Untagged Huntingtin Exon1 Monomer and Fibrils Using a SUMO Fusion Strategy
11:22

Generation of Native, Untagged Huntingtin Exon1 Monomer and Fibrils Using a SUMO Fusion Strategy

Published on: June 27, 2018

Area of Science:

  • Neurology
  • Genetics
  • Neurodegenerative Diseases

Background:

  • Diagnosing Huntington's disease (HD) can be complex in patients lacking the characteristic genetic expansion.
  • Phenocopy syndromes mimic HD symptoms but have different underlying causes.
  • A recent review of these differential diagnoses is needed.

Purpose of the Study:

  • To review the differential diagnosis of Huntington's disease phenocopy syndromes.
  • To provide an evidence-based framework for genetic testing in these cases.

Main Methods:

  • Review of cohort studies characterizing known and newly described phenocopy syndromes.
  • Genetic, clinical, radiological, and pathological characterization of these syndromes.
  • Analysis of reported genetic causes including HDL1-3, SCA17, prion diseases, and others.

Main Results:

  • Approximately 1% of suspected Huntington's disease cases are phenocopy syndromes.
  • Common genetic causes in diagnosed phenocopy patients include SCA17, Huntington's disease-like syndrome 2 (HDL2), familial prion disease, and Friedreich's ataxia.
  • A wide range of syndromes can mimic Huntington's disease phenotypes.

Conclusions:

  • Huntington's disease phenocopy syndromes are clinically significant and offer insights into HD pathogenesis.
  • An evidence-based genetic testing framework is proposed for these challenging cases.
  • Accurate diagnosis of phenocopy syndromes is crucial for patient management and research.