Cited by 8,366Genetic Neurodegenerative DiseasesGenetics and Neurodevelopmental DisordersGenetic factors in colorectal cancer

A novel gene containing a trinucleotide repeat that is expanded and unstable on Huntington's disease chromosomes

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MACDONALD, M·1993·Cell

Abstract

The Huntington's disease (HD) gene has been mapped in 4p16.3 but has eluded identification. We have used haplotype analysis of linkage disequilibrium to spotlight a small segment of 4p16.3 as the likely location of the defect. A new gene, IT15, isolated using cloned trapped exons from the target area contains a polymorphic trinucleotide repeat that is expanded and unstable on HD chromosomes. A (CAG)n repeat longer than the normal range was observed on HD chromosomes from all 75 disease families examined, comprising a variety of ethnic backgrounds and 4p16.3 haplotypes. The (CAG)n repeat appears to be located within the coding sequence of a predicted approximately 348 kd protein that is widely expressed but unrelated to any known gene. Thus, the HD mutation involves an unstable DNA segment, similar to those described in fragile X syndrome, spino-bulbar muscular atrophy, and myotonic dystrophy, acting in the context of a novel 4p16.3 gene to produce a dominant phenotype.

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  • Huntington's disease arises from an expansion of cytosine-adenine-guanine trinucleotide repeats in the HTT gene on chromosome 4p16.3, leading to production of a dysfunctional huntingtin protein (polyQ-HTT).

    “Huntington’s Disease arises from an expansion of cytosine-adenine-guanine (CAG) trinucleotide repeats in the HTT gene (formerly IT15) of chromosome 4p16.3, leading to the production of a dysfunctional huntingtin protein (polyQ-HTT) [161,162].”

    From The Impact of Neurotoxin Proteins Trafficked by Primary Cilia and Extracellular Vesicles in Neurodegenerative Diseases (2025) · cites this paper as [162]

    The Introduction identifies an expanded CAG repeat in IT15 on HD chromosomes, and the paper places the gene in chromosome 4p16.3. The Discussion names its protein product huntingtin, but says the expansion most likely acts at either the mRNA or protein level; it does not establish that HD results specifically from production of a dysfunctional polyQ-huntingtin protein. Page numbers are not provided in our copy. (LLM, conf=0.89)

    Experimental — accuracy not yet measured
  • Huntington's disease is usually confirmed by identification of 36 or more CAG repeats on chromosome 4p16.3 in the Huntingtin gene.

    “HD is usually confirmed diagnostically through the identification of 36 or more CAG repeats on the short arm of chromosome 4p16.3 in the Huntingtin gene [162].”

    From The Impact of Neurotoxin Proteins Trafficked by Primary Cilia and Extracellular Vesicles in Neurodegenerative Diseases (2025) · cites this paper as [162]

    The Results (page unavailable) locate the expanded CAG repeat in the gene the Discussion names huntingtin, in the chromosome 4p16.3 region. They support identifying an expanded repeat as a marker of HD, but not the claimed diagnostic cutoff of 36: the HD-specific products studied ranged from 42 to more than 66 repeats, and an unaffected relative had approximately 36. (LLM, conf=0.89)

    Experimental — accuracy not yet measured
  • HD etiology is entirely due to autosomal-dominant HTT mutations with abnormal CAG repeat expansion in exon 1, producing mutant huntingtin protein that aggregates and leads to neurodegeneration.

    “HD etiology is entirely due to autosomal-dominant HTT mutations with abnormal CAG repeat expansion in exon 1, producing mutant huntingtin protein that aggregates and leads to neurodegeneration (379).”

    From Blood-Brain Barrier: From Physiology to Disease and Back (2019) · cites this paper as [379]

    The Introduction and Abstract (page numbers unavailable) describe autosomal-dominant HD and an expanded CAG repeat in IT15, the gene whose protein the Discussion names huntingtin. But the Discussion says the repeat most likely causes HD through effects at the mRNA or protein level and identifies the mechanism of neuronal damage as unresolved. Our copy does not establish exon 1 as the repeat’s location, protein aggregation as the mechanism, or the claim’s unqualified ‘entirely due to’ wording. (LLM, conf=0.90)

    Experimental — accuracy not yet measured
  • The cause of Huntington's disease is an abnormal expansion of CAG triplet repeats in exon 1 of the HTT gene, resulting in an elongated polyglutamine tract in mutant huntingtin protein.

    “The cause of Huntington's disease, an autosomal dominant neurological disorder, is well established as an abnormal expansion of CAG triplet repeats in exon 1 of the ubiquitously expressed huntingtin ( HTT ) gene, resulting in an elongated polyglutamine (Q) tract in the mutant huntingtin protein (mHTT) (MacDonald et al. , 1993).”
  • In Huntington disease, poly-glutamine-expanded mHTT aggregates and accumulates.

    “In Huntington disease, poly-glutamine-expanded mHTT aggregates and accumulates194”

    From PROTAC targeted protein degraders: the past is prologue (2022) · cites this paper as [194]

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Research works printed but not linked: 2

  1. Gusella, J. F., Varsanyi-Breiner, A., Kao, F. T.. Jones, C., Puck, T. T., Keys, C., Orkin, S., and Housman, D. E. (1979). Precise localiza- tion of the human @globin gene complex on chromosome 11. Proc. Natl. Acad. Sci. USA 76, 5239-5243.
  2. Lehrach, H., Drmanac, R.. Hoheisel, J., Larin, Z., Lennon, G., Nizetic, D., Monaco, A., Zehetner, G., and Poustka, A. (1990). Hybridisation fingerprinting in genome mapping and sequencing. In Genome Analy- sis: Genetic and Physical Mapping, Volume 1, K. E. Davies and S. M. Tighlman, eds. (Cold Spring Harbor, New York: Cold Spring Harbor Laboratory Press), pp. 39-81.

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Authors
MACDONALD, M.
Affiliations
Harvard University (US)
Corresponding author
MACDONALD, M
Venue
Cell
Publisher
Elsevier BV
Published
1993-03
Volume
72
Issue
6
Pages
971-983
ISSN
0092-8674 (ISSN-L)
OpenAlex
W2121642311
Cited by
8,366
References
60
Citations by year
2026: 181 · 2025: 272 · 2024: 303 · 2023: 271 · 2022: 293 · 2021: 361 · 2020: 310 · 2019: 275 · 2018: 341 · 2017: 287 · 2016: 329 · 2015: 290 · 2014: 323 · 2013: 328 · 2012: 313
FWCI
77.80
Type
journal article
Language
en
Open access
Locations
  • Cell (publishedVersion)
  • PubMed (publishedVersion)
  • CaltechAUTHORS (California Institute of Technology) (submittedVersion)
  • Deep Blue (University of Michigan) (submittedVersion)
  • ORCA Online Research @Cardiff (Cardiff University) (submittedVersion)
Funders
  • W. M. Keck Foundation
  • Dana Foundation
  • Hereditary Disease Foundation
  • Bristol-Myers Squibb
  • Wellcome Trust
  • National Institutes of Health (5r01ns025631-06)
  • Medical Research Council
  • National Institute of Neurological Disorders and Stroke (R01NS022031, NS25631, NS 16367, NS22031)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Genetic Neurodegenerative Diseases
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetics and Neurodevelopmental Disorders
  • Health Sciences › Medicine › Pathology and Forensic Medicine › Genetic factors in colorectal cancer
Keywords
Huntington's disease, trinucleotide repeat expansion, CAG repeat, IT15 gene, chromosome 4p16.3, haplotype analysis, linkage disequilibrium, repeat instability, fragile X syndrome, myotonic dystrophy, gene mapping
MeSH terms
Amino Acid Sequence, Base Sequence, Chromosomes, Human, Pair 4, Cloning, Molecular, Exons, Genes, Humans, Huntington Disease, Molecular Sequence Data, Mutation, Oligodeoxyribonucleotides, Pedigree, Polymorphism, Genetic, Repetitive Sequences, Nucleic Acid, RNA, Messenger, Restriction Mapping, Gene Expression, Polymerase Chain Reaction

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