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Related Concept Videos

Inheritance of Chromatin Structures03:17

Inheritance of Chromatin Structures

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Epigenetics is the study of inherited changes in a cell's phenotype without changing the DNA sequences. It provides a form of memory for the differential gene expression pattern to maintain cell lineage, position-effect variegation, dosage compensation, and maintenance of chromatin structures such as telomeres and centromeres. For example, the structure and location of the centromere on chromosomes are epigenetically inherited. Its functionality is not dictated or ensured by the underlying...
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The human X chromosome contains over ten times the number of genes as in the Y chromosome. Since males have only one X chromosome, and females have two, one might expect females to produce twice as many of the proteins, with undesirable results.
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In animals, gender is determined by the number and type of sex chromosome. For example, human females have two X chromosomes, and males have one X and one Y chromosome, whereas C.elegans with one X chromosome is a male, and the one with two X chromosomes is a hermaphrodite.
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In most organisms, sex is determined by the ratio of X and Y chromosomes. However, in some organisms, such as Drosophila and C.elegans, sex is determined by the ratio of the number of X chromosomes to the number of sets of autosomes. The Y chromosome in Drosophila is active but does not determine sex. It contains genes responsible for the production of sperms in adult flies.  
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The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions take up more dye, appearing darker, while the less-compact areas take up less dye and appear lighter. Based on the compaction level, chromatins are classified into two primary forms – euchromatin and heterochromatin.
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Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
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Updated: Jul 8, 2025

Combined DNA-RNA Fluorescent In situ Hybridization FISH to Study X Chromosome Inactivation in Differentiated Female Mouse Embryonic Stem Cells
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Roles of the Rlim-Rex1 axis during X chromosome inactivation in mice.

Feng Wang1, Ashmita Chander2, Yeonsoo Yoon3

  • 1Department of Molecular, Cell and Cancer Biology, University of Massachusetts Chan Medical School, Worcester, MA 01605.

Proceedings of the National Academy of Sciences of the United States of America
|December 19, 2023
PubMed
Summary

The Rlim-Rex1 axis regulates imprinted X chromosome inactivation (iXCI) in early female mouse embryos. However, Rex1 downregulation, independent of Rlim, specifically in epiblast cells prevents its involvement in random XCI (rXCI).

Keywords:
Rex1/Zfp42Rlim/Rnf12X chromosome inactivationextraembryonic ectodermimplantation

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Area of Science:

  • Developmental Biology
  • Genetics
  • Epigenetics

Background:

  • X chromosome inactivation (XCI) equalizes gene dosage in female mammals.
  • Imprinted XCI (iXCI) silences the paternal X chromosome early in development.
  • Random XCI (rXCI) occurs later in epiblast cells, with roles for Rlim and Rex1 being debated.

Purpose of the Study:

  • To investigate the roles of the Rlim-Rex1 axis in imprinted and random XCI during early mouse development.
  • To elucidate the regulatory mechanisms governing Xist expression in different cell lineages.

Main Methods:

  • Analysis of Rlim and Rex1 expression dynamics in pre-implantation and peri-implantation mouse embryos.
  • Investigating the functional interplay between Rlim and Rex1 in regulating Xist.
  • Utilizing genetic models to assess the impact of Rlim and Rex1 on XCI.

Main Results:

  • The Rlim-Rex1 axis is active in pre-implantation embryos, influencing imprinted XCI.
  • Rex1 levels are downregulated independently of Rlim in epiblast cells around implantation.
  • This differential regulation explains the distinct roles of the Rlim-Rex1 axis in iXCI versus rXCI.

Conclusions:

  • The Rlim-Rex1 axis is crucial for imprinted XCI but not random XCI in female mice.
  • Dynamic regulation of Rex1, independent of Rlim, in epiblast cells is key to this distinction.
  • This provides a framework for understanding how X chromosome dosage compensation is achieved differentially in extraembryonic and embryonic lineages.