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Related Concept Videos

Epigenetic Regulation01:46

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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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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.
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As the name suggests, non-LTR retrotransposons lack the long terminal repeats characteristic of the LTR retrotransposons. Additionally, both LTR and non-LTR retrotransposons use distinct mechanisms of mobilization. Non-LTR retrotransposons are further divided into two classes - Long interspersed nuclear elements (LINEs) and short interspersed nuclear elements (SINEs), both of which occur abundantly in most mammals, including humans. Some of the active non-LTR retrotransposons in humans are L1...
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Stem cells are undifferentiated cells that divide and produce different cell types. Ordinarily, cells that have differentiated into a specific cell type are terminally differentiated; however, scientists have found a way to reprogram these mature cells so that they dedifferentiate and return to an unspecialized, proliferative state. These cells are pluripotent like embryonic stem cells—able to produce all cell types—and are called induced pluripotent stem cells (iPSCs).
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Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
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Immunostaining for DNA Modifications: Computational Analysis of Confocal Images
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Intermediately Methylated Regions in Normal Cells Are Epimutation Hotspots in Cancer.

Mohamed Mahgoub1, Haley Abel1, Nidhi Davarapalli1

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DNA methylation changes are common in cancer but poorly understood. This study reveals that intermediate DNA methylation in normal cells creates hotspots for epimutations in acute myeloid leukemia and other cancers, acting as a vulnerability.

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Area of Science:

  • Genetics
  • Epigenetics
  • Cancer Biology

Background:

  • DNA methylation alterations are hallmarks of cancer, yet the underlying mechanisms remain unclear.
  • Understanding these epigenetic changes is crucial for deciphering cancer development.

Purpose of the Study:

  • To investigate the mechanisms driving DNA methylation changes in cancer.
  • To identify specific DNA methylation patterns in normal cells that predispose to cancer-associated epimutations.

Main Methods:

  • Analysis of DNA methylation patterns in 100 primary acute myeloid leukemia samples and normal hematopoietic cells.
  • Examination of hematopoietic stem cell clones to study allele-specific methylation.
  • Identification of somatically imprinted regions in various normal tissues.

Main Results:

  • Regions with intermediate DNA methylation in normal hematopoietic cells act as hotspots for stable, clonal epimutations in acute myeloid leukemia.
  • Intermediate methylation reflects random, allele-specific methylation and expression at the single-cell level, akin to somatically acquired imprinting.
  • These somatically imprinted regions are also epimutation hotspots in other cancer types.

Conclusions:

  • Random allele-specific methylation in normal cells is a general cellular property.
  • This epigenetic characteristic represents a vulnerability exploited by cooperating events and clonal selection during cancer development.