Cited by 197Genetics and Neurodevelopmental DisordersGenetic Neurodegenerative DiseasesGenetic and Clinical Aspects of Sex Determination and Chromosomal Abnormalities

Characterization of the full fragile X syndrome mutation in fetal gametes

Malter, Henry E., Iber, Jane C., Willemsen, R., Graaff, Esther de, Tarleton, Jack C., Leisti, J., Warren, Stephen T., Oostra, Ben A.·1997·Nature Genetics

Abstract

Fragile X syndrome results from the expansion of the CGG repeat in the FMR1 gene. Expansion has been suggested to be a postzygotic event with the germline protected. From an analysis of intact ovaries of full mutation fetuses, we now show that only full expansion alleles can be detected in oocytes (but in the unmethylated state). Similarly, the testes of a 13-week full mutation fetus show no evidence of premutations while a 17-week full mutation fetus exhibits some germ cells with attributes of premutations. These data discount the hypothesis that the germline is protected from full expansion and suggest full mutation contraction in the immature testis. Thus, full expansion may already exist in the maternal oocyte, or postzygotic expansion, if it occurs, arises quite early in development prior to germline segregation.

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Crossref · 10.1038/ng0297-165

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  • In full mutation alleles, this boundary is missing and cytosines upstream of the CGG repeat become methylated around the thirteenth week of embryonic development.

    “This boundary is missing in FM alleles, and the cytosines upstream of the CGG repeat become methylated around the thirteenth week of embryonic development (16).”

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Authors
Malter, H. E., Iber, J. C., Willemsen, R., Graaff, E. D., Tarleton, J. C., Leisti, J., Warren, S. T., & Oostra, B. A.
Affiliations
  • Howard Hughes Medical Institute (US)
  • Erasmus University Rotterdam (NL)
  • Greenwood Genetic Center (US)
  • University of Oulu (FI)
Corresponding author
Warren, Stephen T.
Venue
Nature Genetics
Published
1997-02
Volume
15
Issue
2
Pages
165-169
ISSN
  • 1061-4036 (ISSN-L)
  • 1546-1718
OpenAlex
W2094847130
Cited by
197
References
41
Citations by year
2026: 1 · 2023: 1 · 2022: 3 · 2021: 3 · 2019: 3 · 2018: 5 · 2017: 7 · 2016: 3 · 2015: 2 · 2014: 10 · 2013: 6 · 2012: 3
FWCI
12.61
Type
journal article
Language
en
Open access
closed
Locations
  • Nature Genetics (publishedVersion)
  • PubMed (publishedVersion)
  • EUR Research Repository (Erasmus University Rotterdam) (submittedVersion)
Funders
Eunice Kennedy Shriver National Institute of Child Health and Human Development (R37 HD20521, R37HD020521)
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 › Genetic and Clinical Aspects of Sex Determination and Chromosomal Abnormalities
Keywords
fragile X syndrome, FMR1 gene, CGG repeat expansion, full mutation, premutation, germline, oocytes, testis, fetal development, DNA methylation, repeat contraction
MeSH terms
DNA Mutational Analysis, Female, Fetal Diseases, Fetal Proteins, Fragile X Syndrome, Gestational Age, Humans, Male, Models, Genetic, Nerve Tissue Proteins, Oocytes, Ovary, Spermatozoa, Testis, X Chromosome, RNA-Binding Proteins, Genomic Imprinting, Trinucleotide Repeats, DNA Methylation, Fragile X Messenger Ribonucleoprotein 1, Fragile X Mental Retardation Protein

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