Cited by 289Genetics and Neurodevelopmental DisordersGenetic Neurodegenerative DiseasesGenomics and Rare Diseases

Premutation and intermediate-size FMR1 alleles in 10 572 males from the general population: loss of an AGG interruption is a late event in the generation of fragile X syndrome alleles

Dombrowski, C.·2002·Human Molecular Genetics

Abstract

We previously reported a 1:259 prevalence of female carriers of FMR1 premutation-size alleles (greater than 54 triplet repeats) in the general population. We now have screened 10 572 independent males from the same population for similar alleles using high-throughput Southern blotting. We identified 13 male carriers of an allele with more than 54 repeats. This corresponds to a prevalence of 1:813 males (95% confidence interval 1:527 to 1:1781). Haplotype analysis of four markers flanking the triplet array revealed that the prevalence of the major fragile X mutation-associated haplotype was increased among FMR1 alleles of 40-54 repeats. Although sequencing of highly unstable premutation alleles from fragile X families revealed only pure CGG tracts, this was not the case for alleles of similar size that were identified in males from the general population. Forty-eight out of forty-nine alleles of 40 or more triplets had one or two AGG interruptions. This observation, combined with the observation of the enrichment of major fragile X syndrome haplotypes in all alleles of this size, is evidence that the loss of an AGG interruption in the triplet repeat array is not necessary for expansion of normal alleles of 29-30 triplets to intermediate size. The loss of AGG interruptions thus appears to be a late event that leads to greatly increased instability and may be related to the haplotype background of specific FMR1 alleles.

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Crossref · 10.1093/hmg/11.4.371

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  • Premutation prevalence differs across ethnic groups, being higher in people of mixed European descent than in African American and Hispanic people, and is higher than in previous studies.

    “PM prevalence was found to be different in various ethnic groups; it was higher in people of mixed European descent compared with that in African American and Hispanic people (for both males and females) and shows a higher incidence for PM compared with that in previous studies (34,35).”

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Authors
Dombrowski, C.
Affiliations
Hôpital Saint-François d'Assise (CA)
Corresponding author
Dombrowski, C.
Venue
Human Molecular Genetics
Published
2002-02-01
Volume
11
Issue
4
Pages
371-378
ISSN
  • 0964-6906 (ISSN-L)
  • 1460-2083
OpenAlex
W2166567981
Cited by
289
References
41
Citations by year
2026: 1 · 2025: 1 · 2024: 5 · 2023: 5 · 2022: 4 · 2021: 8 · 2020: 5 · 2019: 7 · 2018: 9 · 2017: 7 · 2016: 8 · 2015: 5 · 2014: 15 · 2013: 18 · 2012: 18
FWCI
10.08
Type
journal article
Language
en
Open access
closed
Locations
  • Human Molecular Genetics (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetics and Neurodevelopmental Disorders
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Genetic Neurodegenerative Diseases
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genomics and Rare Diseases
Keywords
fragile X syndrome, fragile X premutation, AGG interruptions, male carriers, haplotype analysis, repeat instability
MeSH terms
Fragile X Syndrome, Gene Frequency, Haplotypes, Heterozygote, Humans, Male, Nerve Tissue Proteins, Quebec, Prevalence, RNA-Binding Proteins, Trinucleotide Repeats, Fragile X Messenger Ribonucleoprotein 1

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