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Role Of Notch Signalling In Intestinal Stem Cell Renewal01:12

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Notch signaling was first discovered in Drosophila melanogaster, where it is involved in cell lineage differentiation. Notch signaling regulates the maintenance and differentiation of intestinal stem cells or ISCs by controlling the expression of atonal homolog 1 or Atoh1. Atoh1 directs cells to differentiate into secretory cells.
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The cells of the blastocyst inner cell mass only remain pluripotent for a short time. This state of pluripotency and self-renewal can be maintained in embryonic stem (ES) cell culture by adding specific chemicals or growth factors to ensure the cells can continue dividing and later differentiate into different cell types. In some cases, the cells are grown on a feeder layer of differentiated cells, which provides the growth factors and extracellular matrix components necessary for stem cell...
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The hematopoietic stem cells or HSCs are multipotent, meaning they can differentiate and give rise to all blood and immune cells. HSCs are maintained in the quiescent stage until an external stimulus initiates their differentiation. The multipotent HSCs exist as two heterogeneous populations, long-term repopulating cells (LTRC) and short-term repopulating cells (STRC). The two HSC populations have different surface markers or receptors and are classified based on quiescence and long-term...
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Reprogramming alters the gene expression in somatic cells, transforming them into induced pluripotent stem (iPS) cells over several generations. Scientists can reprogram cells by introducing genes for four transcription factors—Oct4, Sox2, Klf4, and c-Myc (OSKM) by viral or non-viral methods. These factors are also known as Yamanaka factors after Shinya Yamanaka, who first generated iPS cells using mouse skin cells. Yamanaka was awarded the Nobel Prize in Physiology or Medicine in 2012...
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The stem cell niche is the dynamic microenvironment where stem cells reside. Inside these niches, the cells may remain undifferentiated, undergo high self-renewal, or become lineage-specific progenitors. Stem cells coexist with other niche cells, such as stromal cells. They also interact closely with the ECM. Cell-cell and cell-matrix communication occur via adhesion molecules or soluble factors that signal the stem cells and determine their fate. Stromal cells also provide survival signals to...
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Commitment is the  process whereby stem cells:
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Oct4GiP Reporter Assay to Study Genes that Regulate Mouse Embryonic Stem Cell Maintenance and Self-renewal
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SALL4: engine of cell stemness.

Jianhua Xiong1

  • 1National Institutes of Health, Bethesda, MD 20892, USA. jianhua.xiong@nih.gov.

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Summary
This summary is machine-generated.

Sal-like 4 (SALL4) is a key gene regulating stemness in development and disease. Understanding SALL4

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Area of Science:

  • Developmental Biology
  • Stem Cell Biology
  • Genetics

Background:

  • The spalt (sal) gene family, including sal-like 4 (SALL4), are conserved homeotic genes crucial for embryonic development.
  • SALL4 expression is prominent in embryonic and adult stem cells, highlighting its role in maintaining stemness.
  • Mutations in SALL4 are associated with congenital disorders like Duane syndrome and ventricular septal defects.

Purpose of the Study:

  • To review the mechanisms underlying SALL4's functions in biological development and disease.
  • To explore SALL4 as a therapeutic target for gene therapy.
  • To summarize advancements in SALL4's application in human disease diagnostics and treatments.

Main Methods:

  • Literature review of studies on SALL4 function and genetics.
  • Analysis of SALL4's role in stem cell regulation and tumor growth.
  • Examination of clinical data linking SALL4 mutations to congenital abnormalities.

Main Results:

  • SALL4 acts as a master regulator of stemness, influencing both normal development and tumor progression.
  • SALL4 is a promising target for gene therapy due to its critical roles.
  • Clinical relevance of SALL4 mutations in various congenital diseases is established.

Conclusions:

  • SALL4 is a critical regulator of stem cell function with implications in development and disease.
  • Targeting SALL4 offers potential for novel gene therapies and diagnostic strategies.
  • Further research into SALL4 mechanisms can advance treatments for associated human diseases.