ArticleChromosome research : an international journal on the molecular, supramolecular and evolutionary aspects of chromosome biology2012
Study of methylation of histone H3 lysine 9 and H3 lysine 27 during X chromosome inactivation in three types of cells.
Article in Chromosome research : an international journal on the molecular, supramolecular and evolutionary aspects of chromosome biology, 2012. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 5 papers.
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5 citing papers in PubMed, 14 citations in OpenAlex.
- Nicotinamide N-methyltransferase gene silencing is associated with upregulation of X-inactive specific transcript and downregulation of stemness-related transcription factors in ovarian cancer.Molecular biology reports · 2026Article
- A NovelMolecular and cellular biology · 2021Article
- Changes in the position and volume of inactive X chromosomes during the G0/G1 transition.Chromosome research : an international journal on the molecular, supramolecular and evolutionary aspects of chromosome biology · 2018Article
- Article
- Epigenetics in the Eye: An Overview of the Most Relevant Ocular Diseases.Frontiers in genetics · 2017Review
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6 authors at 2 institutions in 1 country.
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Abstract
Histone methylation is one epigenetic modification of an inactive X chromosome (Xi). Histone H3 lysine 9 dimethylation (H3K9me) and histone H3 lysine 27 trimethylation (H3K27me) are both associated with the chromatin of gene-silenced regions in the X chromosome and with X inactivation. Studies have shown that H3K9me is supposedly an early mark on the X chromosome during inactivation. Here, we examined the distribution and enrichment profiles of H3K9me and H3K27me by indirect immunofluorescence. We found that H3K9me appears to have a broad distribution throughout the whole genome, but is specific, to a certain extent, to the Xi in WI38 cells. In contrast, H3K27me is highly specific to the entire Xi, which differs significantly from other areas of the nucleus. Thus, H3K27me is more suitable as an epigenetic mark than H3K9me. The chromatin immunoprecipitation analyses also showed that H3K27me predominates on the inactive genes of the X chromosome. Additionally, we compared the levels of H3K9me and H3K27me in four X-linked genes and two autosomal genes between the normal cells (WI38) and the tumor cells (HeLa). The results revealed that the methylation levels of the inactive genes (POLA and OCRL) in tumor cells (HeLa) were lower than those in normal cells (WI38) and that the methylation levels of the Xi inactivation-avoidance genes (SMCX and ZFX) and autosomal genes (Myc and β-actin) varied widely in tumor cells (HeLa). These events may be significant for cancer cell development and contribute to the characteristics of tumor cells.
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