Cited by 79Genetic and Clinical Aspects of Sex Determination and Chromosomal AbnormalitiesEpigenetics and DNA MethylationGenetic Syndromes and Imprinting

Epigenetics in Turner syndrome

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Álvarez-Nava, Francisco, Lanes, Roberto·2018·Clinical Epigenetics

Abstract

Background: Monosomy of the X chromosome is the most frequent genetic abnormality in human as it is present in approximately 2% of all conceptions, although 99% of these embryos are spontaneously miscarried. In postnatal life, clinical features of Turner syndrome may include typical dysmorphic stigmata, short stature, sexual infantilism, and renal, cardiac, skeletal, endocrine and metabolic abnormalities. Main text: Turner syndrome is due to a partial or total loss of the second sexual chromosome, resulting in the development of highly variable clinical features. This phenotype may not merely be due to genomic imbalance from deleted genes but may also result from additive influences on associated genes within a given gene network, with an altered regulation of gene expression triggered by the absence of the second sex chromosome. Current studies in human and mouse models have demonstrated that this chromosomal abnormality leads to epigenetic changes, including differential DNA methylation in specific groups of downstream target genes in pathways associated with several clinical and metabolic features, mostly on autosomal chromosomes. In this article, we begin exploring the potential involvement of both genetic and epigenetic factors in the origin of X chromosome monosomy. We review the dispute between the meiotic and post-zygotic origins of 45,X monosomy, by mainly analyzing the findings from several studies that compare gene expression of the 45,X monosomy to their euploid and/or 47,XXX trisomic cell counterparts on peripheral blood mononuclear cells, amniotic fluid, human fibroblast cells, and induced pluripotent human cell lines. From these studies, a profile of epigenetic changes seems to emerge in response to chromosomal imbalance. An interesting finding of all these studies is that methylation-based and expression-based pathway analyses are complementary, rather than overlapping, and are correlated with the clinical picture displayed by TS subjects. Conclusions: The clarification of these possible causal pathways may have future implications in increasing the life expectancy of these patients and may provide informative targets for early pharmaceutical intervention.

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  • Reduced expression of the UTX gene is associated with impairment of the T-cell mediated immune response and chronic viral infections in TS.

    “In addition to these anatomical differences, reduced expression of the UTX gene is associated with impairment of the T-cell mediated immune response and chronic viral infections.656-658”

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Research works printed but not linked: 2

  1. [81]Ashworth A Rastan S Lovell-Badge R Kay G X-chromosome inactivation may explain the difference in viability of XO humans and mice Nature 1991 351 406 10.1038/351406a0 2034290 · DOI
  2. [97]Hon GC Rajagopal N Shen Y Mccleary DF Yue F Dang MD HHS Public Access 2014 45 1198 1206 PMC4095776 23995138

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Authors
Álvarez-Nava, F., & Lanes, R.
Affiliations
Hospital Clínico Universitario de Caracas (VE)
Venue
Clinical Epigenetics
Published
2018-04-06
Volume
10
Issue
1
Pages
45-45
ISSN
  • 1868-7075 (ISSN-L)
  • 1868-7083
OpenAlex
W2802224646
Cited by
79
References
160
Citations by year
2026: 6 · 2025: 13 · 2024: 12 · 2023: 11 · 2022: 11 · 2021: 8 · 2020: 9 · 2019: 8
FWCI
0.88
Type
journal article
Language
en
Open access
Locations
  • Clinical Epigenetics (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • Greater South Information System
Funders
Academie de Recherche et D'Enseignement Superieur of Belgique (2016-157E)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic and Clinical Aspects of Sex Determination and Chromosomal Abnormalities
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Epigenetics and DNA Methylation
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic Syndromes and Imprinting
Keywords
Turner syndrome, X chromosome monosomy, epigenetics, DNA methylation, gene expression, 45,X, chromosomal imbalances, sex chromosome dosage, short stature, sexual infantilism, dysmorphic features, mouse model
MeSH terms
Female, Gene Expression Regulation, Humans, Monosomy, Trisomy, Turner Syndrome, DNA Methylation, Gene Expression Profiling, Chromosomes, Human, X, Epigenesis, Genetic, Gene Regulatory Networks

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