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MicroRNAs01:22

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MicroRNA (miRNA) are short, regulatory RNA transcribed from introns (non-coding regions of a gene) or intergenic regions (stretches of DNA present between genes). Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself, forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After the pre-miRNA...
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MicroRNA (miRNA) are short, regulatory RNA transcribed from introns—non-coding regions of a gene—or intergenic regions—stretches of DNA present between genes. Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After...
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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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Common myeloid progenitors (CMPs) are oligopotent cells that can differentiate into granulocytes and macrophages. Granulocytes and macrophages are essential for protecting the body against bacterial, viral, or fungal infections. They migrate from the bone marrow into the circulating blood to reach specific tissue sites where they differentiate and help in immune surveillance. However, they survive only for a few days and must be continuously made available to the organism to maintain a robust...
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Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the...
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Pathogenic microRNA's in myeloid malignancies.

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MicroRNAs (miRNAs) are crucial regulators of normal blood cell development. Dysregulated miRNAs function as oncogenes or tumor suppressors in acute myeloid leukemia (AML), impacting disease development and maintenance.

Keywords:
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Area of Science:

  • Molecular Biology
  • Oncology
  • Hematology

Background:

  • MicroRNAs (miRNAs) are vital regulators of normal hematopoiesis and hematopoietic stem cell function.
  • Aberrant miRNA expression is implicated in hematologic malignancies, including acute myeloid leukemia (AML).

Purpose of the Study:

  • To summarize miRNAs with experimentally validated functional roles in AML pathogenesis.
  • To discuss the therapeutic implications of these findings for AML treatment.

Main Methods:

  • Review of existing literature on miRNA dysregulation in AML.
  • Analysis of experimental evidence supporting functional roles of specific miRNAs in AML.

Main Results:

  • Numerous miRNAs show altered expression in AML, but only a subset has confirmed functional roles.
  • Specific miRNAs are identified as key mediators in AML development and maintenance.

Conclusions:

  • Understanding the functional roles of miRNAs in AML is crucial for targeted therapy development.
  • miRNA-directed therapies hold promise for treating acute myeloid leukemia.