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The histone proteins in the nucleosomes are post-translationally modified (PTM) to increase or decrease access to DNA. The commonly observed PTMs are methylation, acetylation, phosphorylation, and ubiquitination of lysine amino acids in the histone H3 tail region. These histone modifications have specific meaning for the cell. Hence, they are called "histone code". The protein complex involved in histone modification is termed as "reader-writer" complex.
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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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Related Experiment Video

Updated: Feb 26, 2026

Correlating Gene-specific DNA Methylation Changes with Expression and Transcriptional Activity of Astrocytic KCNJ10 Kir4.1
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KMT2A and KMT2B Mediate Memory Function by Affecting Distinct Genomic Regions.

Cemil Kerimoglu1, M Sadman Sakib2, Gaurav Jain2

  • 1Department for Psychiatry and Psychotherapy, University Medical Center Goettingen, Goettingen 37075, Germany.

Cell Reports
|July 21, 2017
PubMed
Summary

Lysine methyltransferase 2A (Kmt2a) and Kmt2b are crucial for memory formation. These enzymes regulate distinct genes and pathways, offering insights into epigenetic therapies for brain diseases.

Keywords:
Alzheimer’s diseaseChIP-seqKmt2aKmt2bMll1Mll2RNA-seqgene expressionhippocampushistone methylationmemory

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Area of Science:

  • Neuroscience
  • Epigenetics
  • Molecular Biology

Background:

  • Lysine methyltransferase 2A (Kmt2a) and Kmt2b are H3K4 methyltransferases belonging to the Set1/Trithorax class.
  • Previous research highlighted Kmt2b's role in learning and memory.
  • This study investigates the function of Kmt2a in memory formation.

Purpose of the Study:

  • To compare the effects of Kmt2a and Kmt2b knockdown on H3K4 methylation and gene expression in hippocampal neurons.
  • To elucidate the distinct genomic regions and molecular pathways regulated by Kmt2a and Kmt2b.
  • To explore the potential of Kmt2a in neurodegenerative disease models.

Main Methods:

  • Gene expression analysis in hippocampal neurons.
  • Histone methylation assays (H3K4 methylation).
  • Comparison of Kmt2a and Kmt2b knockdown effects in mouse models.

Main Results:

  • Kmt2a, similar to Kmt2b, is important for memory formation.
  • Kmt2a and Kmt2b regulate distinct genomic regions and molecular pathways involved in neuronal plasticity.
  • Kmt2a knockdown partially mimics gene expression changes seen in a neurodegeneration model (CK-p25 mice).

Conclusions:

  • Kmt2a and Kmt2b exhibit distinct functions despite their close relationship as histone-modifying enzymes.
  • Understanding these distinct roles is vital for developing targeted epigenetic therapies for brain disorders.
  • The findings provide essential insights into the epigenetic mechanisms underlying memory and neurodegeneration.