Cited by 496Genetic Neurodegenerative DiseasesGenetic factors in colorectal cancerGenetics and Neurodevelopmental Disorders

Mechanisms of trinucleotide repeat instability during human development

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McMurray, Cynthia T.·2010·Nature Reviews Genetics

Abstract

Trinucleotide expansion underlies several human diseases. Expansion occurs during multiple stages of human development in different cell types, and is sensitive to the gender of the parent who transmits the repeats. Repair and replication models for expansions have been described, but we do not know whether the pathway involved is the same under all conditions and for all repeat tract lengths, which differ among diseases. Currently, researchers rely on bacteria, yeast and mice to study expansion, but these models differ substantially from humans. We need now to connect the dots among human genetics, pathway biochemistry and the appropriate model systems to understand the mechanism of expansion as it occurs in human disease.

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  • Pre-mutation and mutation lengths vary widely among the repeat expansion disorders.

    “Pre-mutation and mutation lengths vary widely among the repeat expansion disorders (Iyer et al., 2015; McMurray, 2010).”
  • More than 25 inherited human disorders are caused by the unstable expansion of repetitive DNA sequences termed short tandem repeats (STRs).

    “More than 25 inherited human disorders are caused by the unstable expansion of repetitive DNA sequences termed short tandem repeats (STRs).”
  • Normal-length STR tracts are generally stable across generations and among somatic tissues in the same individual.

    “Normal-length STR tracts are generally stable across generations and among somatic tissues in the same individual (McMurray, 2010).”
  • A large number of daSTRs known to undergo paternal instability co-localized to boundaries in mouse sperm and not in mouse oocytes.

    “Notably, a large number of daSTRs known to undergo paternal instability (McMurray, 2010; Pearson et al., 2005) co-localized to boundaries in mouse sperm and not in mouse oocytes (Du et al., 2017), suggesting that daSTRs could be at boundaries when germ line expansion takes place (Figure S3).”
  • Studies in model organisms show that mutations in genes encoding key machinery involved in DNA replication, repair, and recombination are linked to STR instability.

    “Studies in model organisms show that mutations in genes encoding key machinery involved in DNA replication, repair, and recombination are linked to STR instability (Iyer et al., 2015; McMurray, 2010; Mirkin, 2007; Pearson et al., 2005).”

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Authors
McMurray, C. T.
Affiliations
Lawrence Berkeley National Laboratory (US)
Corresponding author
McMurray, Cynthia T.
Venue
Nature Reviews Genetics
Published
2010-10-18
Volume
11
Issue
11
Pages
786-799
ISSN
  • 1471-0056 (ISSN-L)
  • 1471-0064
OpenAlex
W1970814720
Cited by
496
References
129
Citations by year
2026: 12 · 2025: 18 · 2024: 30 · 2023: 23 · 2022: 21 · 2021: 29 · 2020: 28 · 2019: 35 · 2018: 41 · 2017: 31 · 2016: 41 · 2015: 38 · 2014: 28 · 2013: 48 · 2012: 42
FWCI
3.33
Type
journal article
Language
en
Update notices
erratum (2010-11-10)
Open access
Locations
  • Nature Reviews Genetics (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institutes of Health
  • National Cancer Institute (CA-092584, P01CA092584)
  • National Institute of General Medical Sciences (GM 066359, R01GM066359)
  • National Institute of Neurological Disorders and Stroke (NS069177, RC1NS069177, R01NS040738, R01NS060115, R01NS062384, NS 40738, NS060115, NS062384)
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
trinucleotide repeat expansion, repeat instability, human development, DNA repair, DNA replication, model organisms, trinucleotide repeat disorders
MeSH terms
Animals, Female, Humans, Human Development, Male, Models, Biological, Saccharomyces cerevisiae, Spermatogonia, Trinucleotide Repeats, Trinucleotide Repeat Expansion, Chromosomal Instability, Growth and Development, Mice

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