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Updated: Nov 17, 2025
Fractionation for Resolution of Soluble and Insoluble Huntingtin Species
Published on: February 27, 2018
Huntington's Disease Pathogenesis: Two Sequential Components
Eun Pyo Hong1,2,3, Marcy E MacDonald1,2,3, Vanessa C Wheeler1,2
1Molecular Neurogenetics Unit, Center for Genomic Medicine, Massachusetts General Hospital, Boston, MA, USA.
Insights
Huntington's disease (HD) research advanced human genetics, leading to the HTT gene discovery. Genetic analysis of HD offers insights into its two-stage pathogenesis, though effective treatments remain elusive.
Area of Science:
- Human Genetics
- Neurodegenerative Disorders
- Genomic Medicine
Background:
- Huntington's disease (HD) is a familial neurodegenerative disorder characterized by motor, cognitive, and psychiatric symptoms.
- HD's genetic basis was the first autosomal disease mapped using DNA polymorphisms, significantly impacting human genetics research.
- The identification of the HD gene (HTT) and its location spurred technological advancements crucial for the Human Genome Project.
Purpose of the Study:
- To highlight the historical significance of Huntington's disease in advancing human genetics.
- To underscore the role of HD genetic research in developing gene cloning and sequencing technologies.
- To explain how genotype-phenotype studies in HD provide insights into disease mechanisms.
Main Methods:
- Genetic linkage analysis with DNA polymorphisms to map the HD gene.
- Gene cloning and sequencing technologies developed using the HTT locus as a model.
- Genotype-phenotype relationship analysis in large Huntington's disease patient cohorts.
Main Results:
- The genetic defect for Huntington's disease was localized to chromosome 4p16.3, identifying the HTT gene.
- Advancements in genetic technologies were accelerated by research on the HD gene.
- Analysis of HD patient data revealed genotype-phenotype correlations, elucidating disease pathogenesis.
Conclusions:
- The study of Huntington's disease has been pivotal in the progress of human genetics and genomic technologies.
- Despite the identification of the HTT gene, effective treatments for HD are still under development.
- Ongoing genetic research continues to deepen our understanding of HD pathogenesis, distinguishing distinct disease phases.
Abstract:
Historically, Huntington's disease (HD; OMIM #143100) has played an important role in the enormous advances in human genetics seen over the past four decades. This familial neurodegenerative disorder involves variable onset followed by consistent worsening of characteristic abnormal movements along with cognitive decline and psychiatric disturbances. HD was the first autosomal disease for which the genetic defect was assigned to a position on the human chromosomes using only genetic linkage analysis with common DNA polymorphisms. This discovery set off a multitude of similar studies in other diseases, while the HD gene, later renamed HTT, and its vicinity in chromosome 4p16.3 then acted as a proving ground for development of technologies to clone and sequence genes based upon their genomic location, with the growing momentum of such advances fueling the Human Genome Project. The identification of the HD gene has not yet led to an effective treatment, but continued human genetic analysis of genotype-phenotype relationships in large HD subject populations, first at the HTT locus and subsequently genome-wide, has provided insights into pathogenesis that divide the course of the disease into two sequential, mechanistically distinct components.
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