Cited by 114Genetic and Clinical Aspects of Sex Determination and Chromosomal AbnormalitiesSexual Differentiation and DisordersSex and Gender in Healthcare

The importance of having two X chromosomes

Open access
Arnold, Arthur P., Reue, Karen, Eghbali, Mansoureh, Vilain, Eric, Chen, Xuqi, Ghahramani, Negar, Itoh, Yuichiro, Li, Jingyuan +3 more·2016·Philosophical Transactions of the Royal Society B: Biological Sciences

Abstract

Historically, it was thought that the number of X chromosomes plays little role in causing sex differences in traits. Recently, selected mouse models have been used increasingly to compare mice with the same type of gonad but with one versus two copies of the X chromosome. Study of these models demonstrates that mice with one X chromosome can be strikingly different from those with two X chromosomes, when the differences are not attributable to confounding group differences in gonadal hormones. The number of X chromosomes affects adiposity and metabolic disease, cardiovascular ischaemia/reperfusion injury and behaviour. The effects of X chromosome number are likely the result of inherent differences in expression of X genes that escape inactivation, and are therefore expressed from both X chromosomes in XX mice, resulting in a higher level of expression when two X chromosomes are present. The effects of X chromosome number contribute to sex differences in disease phenotypes, and may explain some features of X chromosome aneuploidies such as in Turner and Klinefelter syndromes.

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Crossref · 10.1098/rstb.2015.0113

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97 of 98 references verified1 citation errors · 0 not checkable

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  • X and Y gene dose discrepancies account for several sex-biased phenotypes in the brain and periphery.

    “Questions regarding the effects of X and Y gene imbalance have been explored over the past decade, and the data suggests that X and Y gene dose discrepancies account for several sex-biased phenotypes in the brain and periphery (Arnold, 2004; Arnold et al., 2016; Burgoyne et al., 1995).”

    From Hypothalamic–pituitary–adrenal and hypothalamic–pituitary–gonadal axes: sex differences in regulation of stress responsivity (2017) · cites this paper as Arnold et al., 2016

    The Conclusion and prospectus reports that differences in X and Y chromosome effects cause sex differences in non-gonadal tissues, and section 4 gives an example involving body weight. But the Conclusion says the responsible X genes have not yet been identified and nongenic effects cannot be ruled out. The paper therefore supports sex-chromosome effects on phenotypes, not the stronger claim that X and Y gene-dose discrepancies have been established as their cause. (LLM, conf=0.85)

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Research works printed but not linked: 4

  1. Migeon BR. 2007 Females are mosaic: X inactivation and sex differences in disease. Oxford, UK: Oxford University Press.
  2. Eicher EM, Hale DW, Hunt PA, Lee BK, Tucker PK, King TR, Eppig JT, Washburn L. 1991 The mouse Y* chromosome involves a complex rearrangement, including interstitial positioning of the pseudoautosomal region. Cytogenet. Cell Genet. 57, 221-230. (doi:10.1159/000133152) · DOI
  3. Corre C, Friedel M, Vousden DA, Metcalf A, Spring S, Qiu LR, Lerch JP, Palmert MR. In press. Separate effects of sex hormones and sex chromosomes on brain structure and function revealed by high- resolution magnetic resonance imaging and spatial navigation assessment of the Four Core Genotype mouse model. Brain Struct. Funct.
  4. Snijders Blok L et al. 2015 Mutations in DDX3X are a common cause of unexplained intellectual disability with gender-specific effects on Wnt signaling. Am. J. Hum. Genet. 97, 343-352. (doi:10.1016/j. ajhg.2015.07.004) 101. Yamauchi Y, Riel JM, Stoytcheva Z, Ward MA. 2014 Two Y genes can replace the entire Y chromosome for assisted reproduction in the mouse. Science 343, 69-72. (doi:10.1126/science.1242544) 102. Shpargel KB, Sengoku T, Yokoyama S, Magnuson T. 2012 UTX and UTY demonstrate histone demethylase-independent function in mouse embryonic development. PLoS Genet. 8, e1002964. (doi:10.1371/journal.pgen.1002964) 103. · DOI

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Authors
Arnold, A. P., Reue, K., Eghbali, M., Vilain, E., Chen, X., Ghahramani, N., Itoh, Y., Li, J., Link, J. C., Ngun, T., & Williams-Burris, S. M.
Affiliations
University of California, Los Angeles (US)
Corresponding author
Arnold, Arthur P.
Venue
Philosophical Transactions of the Royal Society B: Biological Sciences
Published
2016-02-19
Volume
371
Issue
1688
Pages
20150113
ISSN
  • 0962-8436 (ISSN-L)
  • 1471-2970
OpenAlex
W2338995534
Cited by
114
References
98
Citations by year
2026: 4 · 2025: 6 · 2024: 10 · 2023: 5 · 2022: 9 · 2021: 11 · 2020: 11 · 2019: 13 · 2018: 15 · 2017: 13 · 2016: 17
FWCI
2.59
Type
journal article
Language
en
Open access
Locations
  • Philosophical Transactions of the Royal Society B Biological Sciences (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • eScholarship (California Digital Library) (submittedVersion)
Funders
National Institutes of Health (DK083561, HD076125, HL119886, HL90553, NS043196, T32GM007185, T32HD007228)
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 › Sexual Differentiation and Disorders
  • Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Sex and Gender in Healthcare
Keywords
X chromosome number, sex differences, X chromosome inactivation, X chromosome aneuploidy, Turner syndrome, Klinefelter syndrome, adiposity, metabolic disorders, behavior, mouse model
MeSH terms
Animals, Female, Gene Expression Regulation, Genotype, Male, Sex Factors, Gonadal Steroid Hormones, X Chromosome

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