Cited by 166Down syndrome and intellectual disability researchGenomic variations and chromosomal abnormalitiesGenetic and Clinical Aspects of Sex Determination and Chromosomal Abnormalities

Primary and secondary transcriptional effects in the developing human down syndrome brain and heart

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Mao, Rong, Wang, Xiaowen, Spitznagel, Edward L, Frelin, Laurence P, Ting, Jason C, Ding, Huashi, Kim, Jung-whan, Ruczinski, Ingo +2 more·2005·Genome Biology

Abstract

Background: Down syndrome, caused by trisomic chromosome 21, is the leading genetic cause of mental retardation. Recent studies demonstrated that dosage-dependent increases in chromosome 21 gene expression occur in trisomy 21. However, it is unclear whether the entire transcriptome is disrupted, or whether there is a more restricted increase in the expression of those genes assigned to chromosome 21. Also, the statistical significance of differentially expressed genes in human Down syndrome tissues has not been reported. Results: We measured levels of transcripts in human fetal cerebellum and heart tissues using DNA microarrays and demonstrated a dosage-dependent increase in transcription across different tissue/cell types as a result of trisomy 21. Moreover, by having a larger sample size, combining the data from four different tissue and cell types, and using an ANOVA approach, we identified individual genes with significantly altered expression in trisomy 21, some of which showed this dysregulation in a tissue-specific manner. We validated our microarray data by over 5,600 quantitative real-time PCRs on 28 genes assigned to chromosome 21 and other chromosomes. Gene expression values from chromosome 21, but not from other chromosomes, accurately classified trisomy 21 from euploid samples. Our data also indicated functional groups that might be perturbed in trisomy 21. Conclusions: In Down syndrome, there is a primary transcriptional effect of disruption of chromosome 21 gene expression, without a pervasive secondary effect on the remaining transcriptome. The identification of dysregulated genes and pathways suggests molecular changes that may underlie the Down syndrome phenotypes.

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Crossref · 10.1186/gb-2005-6-13-r107

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  • Quantification of both mRNA and protein levels in brains of individuals with DS from fetal to adult stages have shown that not all trisomic genes are dysregulated or expressed at 1.5-fold.

    “Quantification of both mRNA and protein levels in brains of individuals with DS from fetal to adult stages have shown that not all trisomic genes are dysregulated or expressed at 1.5-fold (Lockstone et al., 2007; Mao et al., 2005; Mao et al., 2003).”

    From Sex-specific developmental alterations in DYRK1A expression in the brain of a Down syndrome mouse model (2024) · cites this paper as Mao et al., 2005

    The Discussion (page unavailable) says that only a subset of expressed chromosome 21 transcripts was elevated in the tissues studied, supporting the claim that not all trisomic genes are dysregulated. But this study measured RNA in fetal tissues, not protein levels or brains across fetal-to-adult stages; its Conclusion says the relationship between RNA and protein levels was unknown. (LLM, conf=0.90)

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  1. Lejeune J Gautier M Turpin R Etudes des chromosomes somatique de neuf enfants mongoliens. Comptes Rendus Academie des Sciences Paris 1959 248 1721 1722 13639368

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Authors
Mao, R., Wang, X., Spitznagel, E. L., Frelin, L. P., Ting, J. C., Ding, H., Kim, J.-W., Ruczinski, I., Downey, T. J., & Pevsner, J.
Affiliations
  • Johns Hopkins University (US)
  • Partek (United States) (US)
  • Washington University in St. Louis (US)
  • Kennedy Krieger Institute (US)
Corresponding author
Pevsner, Jonathan
Venue
Genome Biology
Published
2005-12-16
Volume
6
Issue
13
Pages
R107-R107
ISSN
  • 1465-6906 (ISSN-L)
  • 1474-760X
OpenAlex
W2159929448
Cited by
166
References
58
Citations by year
2025: 5 · 2024: 2 · 2023: 4 · 2022: 7 · 2021: 10 · 2020: 5 · 2019: 8 · 2018: 7 · 2017: 9 · 2016: 4 · 2015: 2 · 2014: 8 · 2013: 11 · 2012: 15
FWCI
12.23
Type
journal article
Language
en
Open access
Locations
  • Genome biology (publishedVersion, cc-by)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Johns Hopkins University
  • National Institutes of Health
  • Johns Hopkins Bloomberg School of Public Health
  • National Cancer Institute (CA074841, R29CA074841, R01CA074841)
  • Eunice Kennedy Shriver National Institute of Child Health and Human Development (R01HD046598)
Topics
  • Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Down syndrome and intellectual disability research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genomic variations and chromosomal abnormalities
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic and Clinical Aspects of Sex Determination and Chromosomal Abnormalities
Keywords
Down syndrome, gene expression dysregulation, transcriptome, fetal cerebellum, fetal heart, tissue-specific gene expression, intellectual disability, differentially expressed genes
MeSH terms
Astrocytes, Cell Line, Chromosomes, Human, Pair 21, Down Syndrome, Fetus, Heart, Humans, Myocardium, RNA, Messenger, Telencephalon, Transcription, Genetic, Reproducibility of Results, Cluster Analysis, Gene Expression Regulation, Developmental, Principal Component Analysis, Microarray Analysis

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