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General Transcription Factors01:30

General Transcription Factors

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Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...
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Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...
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All blood and immune cells are produced from the multipotent hematopoietic stem cells (HSCs) by the process of hematopoiesis. However, they all have a limited life span. In addition, many are depleted in immune surveillance or combatting an injury or infection. This makes blood one of the most regenerative tissues. Hematopoiesis helps replenish these blood and immune cells, restoring the body's normal functioning. However, overproduction of blood and immune cells can make them cancerous or...
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Hematopoietic growth factors are molecules that regulate the differentiation rate of hematopoietic stem cells (HSCs). Erythropoietin (EPO), primarily produced by the kidneys, plays a crucial role in erythrocyte production. When oxygen levels in the blood are low, EPO is released into the bloodstream, reaching the bone marrow, where it stimulates HSCs to differentiate and mature into erythrocytes, which are vital for oxygen transport.
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Several external and internal factors influence the initiation and inhibition of cell division. For instance, the death of nearby cells or the release of human growth hormone (hGH) promotes cell division. In contrast, lack of hGH or crowding of cells can inhibit cell division.
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Rapidly dividing tumors, embryos, and wounded tissues require more oxygen than usual, lowering the oxygen concentration in the blood. At low oxygen or hypoxic conditions, an oxygen-sensitive transcription factor called the hypoxia-inducible factor 1 or HIF1 is activated. HIF1 is a dimeric protein of alpha (ɑ) and beta (β) subunits.  Under optimal oxygen conditions, HIF1β is present in the nucleus while HIF1ɑ remains in the cytosol. HIF1ɑ is hydroxylated by prolyl...
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Essential elements for translation: the germline factor Vasa functions broadly in somatic cells.

Mamiko Yajima1, Gary M Wessel2

  • 1MCB Department, Brown University, 185 Meeting Street, BOX-GL173, Providence, RI 02912, USA Mamiko_Yajima@brown.edu.

Development (Cambridge, England)
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Summary

Vasa, an RNA-helicase, is crucial for mRNA translation, embryonic development, and wound healing in sea urchins. Its role extends beyond germline determination to broader developmental regulation.

Keywords:
Cell-cycle regulatorMultipotent cellsSea urchinTranslationVasaWound healing

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Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Cell Biology

Background:

  • Vasa is a conserved RNA-helicase primarily known for its role in germline determination across metazoans.
  • While its presence is a common metric for germline cells, Vasa is also found in various stem cells.
  • Emerging evidence points to broader functions, including significant involvement in cell cycle regulation.

Purpose of the Study:

  • To investigate the diverse roles of Vasa beyond germline determination.
  • To explore Vasa's function in somatic cells and adult precursor tissues during development.
  • To elucidate Vasa's specific contributions to sea urchin embryogenesis, development, and regeneration.

Main Methods:

  • Analysis of Vasa expression patterns in diverse cell types during development.
  • Functional studies in sea urchin embryos to assess Vasa's necessity for key developmental processes.
  • Investigation of Vasa's molecular interactions during cell cycle progression.

Main Results:

  • Vasa is expressed transiently in diverse somatic cells and adult precursor tissues during development.
  • In sea urchins, Vasa is essential for general mRNA translation during embryogenesis.
  • Vasa plays a critical role in developmental reprogramming and larval wound healing.
  • Vasa interacts with mRNAs in specific cellular locations (perinuclear, spindle) dependent on Importin during cell division.

Conclusions:

  • Vasa exhibits a broader functional spectrum than previously recognized, extending to somatic cells and developmental regulation.
  • The RNA-helicase Vasa is indispensable for fundamental processes like mRNA translation and cellular repair in developing organisms.
  • Vasa's interaction with mRNA during cell cycle progression highlights its importance in coordinating cellular activities for development.