Cited by 122Genetic Neurodegenerative DiseasesGenetic factors in colorectal cancerGenetics and Neurodevelopmental Disorders

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Cis-acting modifiers of expanded CAG/CTG triplet repeat expandability: associations with flanking GC content and proximity to CpG islands

Brock, G.·1999·Human Molecular Genetics

DOI 10.1093/hmg/8.6.1061

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Abstract

An increasing number of human genetic disorders are associated with the expansion of trinucleotide repeats. The majority of these diseases are associated with CAG/CTG expansions, including Huntington's disease, myotonic dystrophy and many of the spinocerebellar ataxias. Recently, two new expanded CAG/CTG repeats have been identified that are not associated with a phenotype. Expanded alleles at all of these loci are unstable, with frequent length changes during intergenerational transmission. However, variation in the relative levels of instability, and the size and direction of the length change mutations observed, between the CAG/CTG loci is apparent. We have quantified these differences, taking into account effects of progenitor allele length, by calculating the relative expandability of each repeat. Since the repeat motifs are the same, these differences must be a result of flanking sequence modifiers. We present data that indicate a strong correlation between the relative expandability of these repeats and the flanking GC content. Moreover, we demonstrate that the most expandable loci are all located within CpG islands. These data provide the first insights into the molecular bases of cis -acting flanking sequences modifying the relative mutability of dispersed expanded human triplet repeats.

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Authors: Brock, G.
Affiliations: University of Glasgow (GB)
Corresponding author: Brock, G.
Venue: Human Molecular Genetics
Publisher: Oxford University Press (OUP)
Published: 1999-06-01
Volume: 8
Issue: 6
Pages: 1061-1067
ISSN: 0964-6906 (ISSN-L)
1460-2083
DOI: 10.1093/hmg/8.6.1061
OpenAlex: W2169098034
Cited by: 122
References: 46
Citations by year: 2025: 1 · 2024: 4 · 2023: 1 · 2022: 3 · 2021: 4 · 2020: 1 · 2019: 1 · 2018: 3 · 2017: 5 · 2016: 2 · 2015: 1 · 2013: 3 · 2012: 3
FWCI: 3.25
Type: journal article
Language: en
Open access: closed
Locations: Human Molecular Genetics (publishedVersion)
PubMed (publishedVersion)
ENLIGHTEN (Jurnal Bimbingan dan Konseling Islam) (submittedVersion)
HighWire Press Open Archive (submittedVersion)
Funders: Muscular Dystrophy Association
University of Glasgow
Lister Institute of Preventive Medicine
Medical Research Council
U.S. National Library of Medicine
Topics: Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Genetic Neurodegenerative Diseases
Health Sciences › Medicine › Pathology and Forensic Medicine › Genetic factors in colorectal cancer
Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetics and Neurodevelopmental Disorders
Keywords: CAG/CTG repeat expansion, trinucleotide repeat instability, CpG islands, Huntington's disease, myotonic dystrophy, spinocerebellar ataxia, intergenerational transmission
MeSH terms: Base Composition, DNA, Female, Genes, Humans, Male, Mutation, Regulatory Sequences, Nucleic Acid, Spermatozoa, CpG Islands, Trinucleotide Repeat Expansion

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Cis-acting modifiers of expanded CAG/CTG triplet repeat expandability: associations with flanking GC content and proximity to CpG islands

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