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Related Concept Videos

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Master Transcription Regulators

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Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a  complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...
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Inducible Operons: lac Operon01:25

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The lac operon in Escherichia coli is a model for understanding inducible gene regulation and metabolic flexibility. It integrates local control by lactose and global regulation through catabolite repression, enabling E. coli to preferentially metabolize glucose when available and switch to lactose utilization when glucose is scarce.Structure and Function of the lac OperonThe lac operon contains three structural genes: lacZ (β-galactosidase), lacY (lactose permease), and lacA...
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The organization of prokaryotic genes in their genome is notably different from that of eukaryotes. Prokaryotic genes are organized, such that the genes for proteins involved in the same biochemical process or function are located together in groups. This group of genes, along with their regulatory elements, are collectively known as an operon. The functional genes in an operon are transcribed together to give a single strand of mRNA known as polycistronic mRNA.
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Global regulatory systems in bacteria enable rapid and coordinated responses to environmental changes by integrating sensory inputs with gene expression, ensuring efficient adaptation to fluctuating conditions. Key global regulatory mechanisms include regulons, two-component systems, sigma factors, and secondary messengers.Regulons and Global RegulatorsA regulon is a collection of genes and operons controlled by a common global regulator. These regulators enable bacteria to prioritize resource...
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Cell Specific Gene Expression01:58

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Multicellular organisms contain a variety of structurally and functionally distinct cell types, but the DNA in all the cells originated from the same parent cells. The differences in the cells can be attributed to the differential gene expression. Liver cells, whose functions include detoxification of blood, production of bile to metabolize fats, and synthesis of proteins essential for metabolism, must express a specific set of genes to perform their functions. Gene expression also varies with...
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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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Related Experiment Video

Updated: Aug 28, 2025

Embryo Microinjection and Electroporation in the Chordate Ciona intestinalis
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c-MAF coordinates enterocyte zonation and nutrient uptake transcriptional programs.

Alejandra González-Loyola1, Jeremiah Bernier-Latmani1, Irena Roci1

  • 1Department of Oncology, University of Lausanne, and Ludwig Institute for Cancer Research, Lausanne, Epalinges, Switzerland.

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The transcription factor c-MAF regulates nutrient absorption zones in the small intestine. Its loss impairs lipid handling and regeneration after injury, impacting survival.

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Area of Science:

  • Gastroenterology
  • Molecular Biology
  • Developmental Biology

Background:

  • Small intestinal villi are crucial for nutrient absorption in vertebrates.
  • Enterocytes within villi exhibit transcriptional zonation for specialized functions.
  • Bone morphogenetic protein (BMP) signaling influences enterocyte differentiation.

Purpose of the Study:

  • To investigate the role of the transcription factor c-MAF in intestinal villus zonation and nutrient absorption.
  • To determine the impact of c-MAF on enterocyte differentiation and intestinal regeneration.

Main Methods:

  • Analysis of c-MAF expression in differentiated enterocytes.
  • Inactivation of Maf in mouse models to study its effects.
  • Transcriptomic analysis to assess gene expression changes.
  • Assessment of lipid absorption, tuft cell populations, and gut morphology.
  • Evaluation of intestinal regeneration and survival after injury.

Main Results:

  • c-MAF is expressed in lower and mid-villus enterocytes and is a target of BMP signaling.
  • Maf inactivation disrupted villus zonation, altering carbohydrate, amino acid, and lipid absorption transcripts.
  • Loss of c-MAF impaired dietary fat handling and chylomicron formation.
  • Homeostatic Maf inactivation led to tuft cell expansion and gut lengthening, but delayed enterocyte maturation impaired recovery from injury, reducing survival.

Conclusions:

  • c-MAF acts as a key regulator of the intestinal villus zonation program.
  • Proper coordination between stem/progenitor and differentiation programs, involving c-MAF, is essential for intestinal regeneration and survival.