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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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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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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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Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
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Stem cell RNA epigenetics: m(6)arking your territory.

Aimee L Jalkanen1, Jeffrey Wilusz1

  • 1Department of Microbiology, Immunology and Pathology, Colorado State University, Fort Collins, CO 80523, USA.

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Messenger RNA (mRNA) modifications, specifically N(6)-methyl-adenosine, are crucial for embryonic stem cell differentiation. This study reveals how these mRNA changes regulate the exit from pluripotency.

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Area of Science:

  • Epigenetics and Gene Regulation
  • Stem Cell Biology
  • Molecular Biology

Background:

  • Post-transcriptional modifications of messenger RNA (mRNA) significantly impact cellular processes.
  • N(6)-methyl-adenosine (m6A) is a prevalent mRNA modification, but its role in stem cell pluripotency and differentiation remains incompletely understood.

Purpose of the Study:

  • To elucidate the fundamental parameters of N(6)-methyl-adenosine modification in embryonic stem cells.
  • To investigate the functional significance of m6A modification in regulating the exit from pluripotency and subsequent differentiation.

Main Methods:

  • Analysis of m6A modification patterns in embryonic stem cells.
  • Assessment of the impact of m6A modification on mRNA stability and translation.
  • Experimental manipulation of m6A levels to observe effects on pluripotency markers and differentiation trajectories.

Main Results:

  • Batista et al. identified key characteristics of m6A modification in embryonic stem cells.
  • Evidence suggests a direct role for m6A modification in facilitating the transition from a pluripotent state.
  • Specific m6A patterns correlate with the initiation of differentiation processes.

Conclusions:

  • N(6)-methyl-adenosine modification is a critical regulatory mechanism in embryonic stem cells.
  • m6A plays a significant role in controlling the exit from pluripotency, thereby influencing cell fate decisions.