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Histone Modification02:32

Histone Modification

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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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Cis-regulatory sequences are short fragments of non-coding DNA that are present on the same chromosomes as the genes that they regulate. These fragments serve as binding sites for transcriptional regulators, proteins that are responsible for controlling gene transcription and differential gene expression across cell types in eukaryotes. Cis-regulatory sequences can be close to the gene of interest or thousands of bases away in the DNA sequence; however, those sequences that are further away are...
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Gene expression is the process in which DNA directs the synthesis of functional products, that is, proteins. Cells can regulate gene expression at various stages. It allows organisms to generate different cell types and enables cells to adapt to internal and external factors.
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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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Proteins that regulate transcription can do so either via direct contact with RNA Polymerase or through indirect interactions facilitated by adaptors, mediators, histone-modifying proteins, and nucleosome remodelers. Direct interactions to activate transcription is seen in bacteria as well as in some eukaryotic genes. In these cases, upstream activation sequences are adjacent to the promoters, and the activator proteins interact directly with the transcriptional machinery. For example, in...
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Generation of RNA/DNA Hybrids in Genomic DNA by Transformation using RNA-containing Oligonucleotides
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RNA Modification Regulatory Genes in DNA Damage.

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RNA modifications regulate gene expression and are crucial for preventing cancer. This study analyzes RNA-modifying enzymes, focusing on their role in DNA damage response pathways.

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Area of Science:

  • Molecular Biology
  • Cancer Biology
  • Epigenetics

Background:

  • Gene expression regulation is essential for cellular function.
  • Posttranscriptional RNA modifications are key regulatory mechanisms.
  • Dysregulation of RNA modification is linked to cancer development.

Purpose of the Study:

  • To develop a comprehensive mRNA expression analysis method for RNA-modifying enzymes (readers, writers, erasers).
  • To investigate the role of these enzymes in the DNA damage response.
  • To understand how altered expression of RNA modifiers impacts tumorigenesis.

Main Methods:

  • Utilized mRNA expression analysis to quantify RNA reader, writer, and eraser genes.
  • Focused on DNA damage response as a model system.
  • Validated the functional impact of altered RNA modifier expression.

Main Results:

  • Established a method to comprehensively assess RNA modifier expression.
  • Demonstrated the involvement of specific RNA modifiers in DNA damage response.
  • Showcased the link between altered RNA modifier expression and DNA damage pathways.

Conclusions:

  • RNA-modifying enzymes are critical regulators of gene expression and cellular processes.
  • Their dysregulation contributes to pathological conditions like cancer.
  • Targeting RNA modifiers may offer therapeutic strategies for cancer treatment.