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Related Concept Videos

Epigenetic Regulation01:37

Epigenetic Regulation

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Epigenetic changes alter the physical structure of the DNA without changing the genetic sequence and often regulate whether genes are turned on or off. This regulation ensures that each cell produces only proteins necessary for its function. For example, proteins that promote bone growth are not produced in muscle cells. Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
X-chromosome...
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Histone Modification02:32

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The histone proteins have a flexible N-terminal tail extending out from the nucleosome. These histone tails are often subjected to post-translational modifications such as acetylation, methylation, phosphorylation, and ubiquitination. Particular combinations of these modifications form “histone codes” that influence the chromatin folding and tissue-specific gene expression.
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Inheritance of Chromatin Structures03:17

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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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Chromatin modification alters gene expression; therefore, scientists can add histone-modifying enzymes, histone variants, and chromatin remodeling complexes to somatic cells to aid reprogramming into pluripotent stem (iPS) cells.
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Related Experiment Video

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Immunostaining for DNA Modifications: Computational Analysis of Confocal Images
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Distinctive Klf4 mutants determine preference for DNA methylation status.

Hideharu Hashimoto1, Dongxue Wang1, Alyse N Steves2

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Understanding mammalian genome methylation reprogramming is key. Klf4

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Area of Science:

  • Molecular Biology
  • Epigenetics
  • Genomics

Background:

  • Mammalian genome methylation reprogramming is crucial but not fully understood.
  • Klf4, a transcription factor, plays a role in reprogramming and binds DNA via zinc fingers.
  • Klf4's DNA binding domain recognizes CpG or TpG, with similar affinity for methylated and unmethylated forms.

Purpose of the Study:

  • To investigate the structural basis of Klf4's DNA binding preference.
  • To determine the role of Glu446 in Klf4's recognition of methylated and unmethylated DNA.
  • To analyze how mutations at Glu446 affect Klf4's affinity for different DNA sequences.

Main Methods:

  • Site-directed mutagenesis of the Klf4 DNA binding domain at position Glu446.
  • Assessing DNA binding affinities of wild-type and mutant Klf4 using biochemical assays.
  • Structural analysis of Klf4-DNA interactions.
  • Luciferase reporter assays to evaluate transcriptional regulation by Klf4 mutants.

Main Results:

  • Mutating Glu446 to aspartate (E446D) shifted preference to unmethylated cytosine.
  • Mutating Glu446 to proline (E446P) increased affinity for 5-methylcytosine (5mC) by 100-fold.
  • Structural analysis revealed specific interactions (hydrophobic, hydrogen bonding) explaining altered DNA binding preferences.

Conclusions:

  • The Glu446 residue in Klf4 is critical for its DNA methylation preference.
  • Specific amino acid substitutions can alter Klf4's binding affinity for methylated and unmethylated DNA.
  • These findings provide insights into the molecular mechanisms of epigenetic reprogramming.