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Related Concept Videos

Cell Specific Gene Expression01:58

Cell Specific Gene Expression

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...
Eukaryotic Transcription Inhibitors01:52

Eukaryotic Transcription Inhibitors

Certain biochemical processes, such as embryonic development and cell growth regulation, depend on the repression of specific genes. DNA binding proteins known as eukaryotic transcription inhibitors regulate the repression of gene expression in eukaryotes. The presence of these inhibitors at the required location and time in the cell is triggered by the presence of hormones and additional signals from other cells.
Eukaryotic transcription inhibitors usually contain two distinct domains, a DNA...
Master Transcription Regulators02:23

Master Transcription Regulators

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...
Abnormal Proliferation02:23

Abnormal Proliferation

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 daughter...

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Efficient Differentiation of Pluripotent Stem Cells to NKX6-1+ Pancreatic Progenitors
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Suppression of transcription factor PDX-1/IPF1/STF-1/IDX-1 causes no decrease in insulin mRNA in MIN6 cells

Y Kajimoto1, H Watada, T a Matsuoka

  • 1First Department of Medicine, Osaka University School of Medicine, Suita 565, Japan. kajimoto@medone.med.osaka-u.ac.jp

The Journal of Clinical Investigation
|October 6, 1997
PubMed
Summary

Pancreatic and duodenal homeobox 1 (PDX-1) does not significantly impact insulin gene transcription rates. Suppressing PDX-1 expression in beta cells did not alter insulin mRNA levels, challenging its role in glucose-induced insulin biosynthesis regulation.

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Area of Science:

  • Molecular Biology
  • Endocrinology
  • Gene Regulation

Background:

  • PDX-1 (also known as IPF1, STF-1, IDX-1) is a key transcription factor for beta cell-specific gene expression.
  • Impaired PDX-1 activity under high glucose conditions has been linked to decreased insulin gene transcription.

Purpose of the Study:

  • To investigate the role of PDX-1 as a determinant of insulin gene transcription rate.
  • To assess the impact of PDX-1 suppression on beta cell-specific gene expression.

Main Methods:

  • Used antisense oligodeoxynucleotides (ODN) to suppress PDX-1 expression in MIN6 beta cells.
  • Measured PDX-1 expression, DNA binding to the insulin gene A element, and mRNA levels of insulin, glucokinase, and islet amyloid polypeptide.

Main Results:

  • Antisense ODN effectively reduced PDX-1 expression and its DNA binding activity.
  • No significant decrease in insulin mRNA levels was observed despite PDX-1 suppression.
  • Transcription of glucokinase and islet amyloid polypeptide genes remained unchanged.

Conclusions:

  • PDX-1's physiological significance in determining the rate of insulin gene transcription is disputed by these findings.
  • Other factors in the transcription machinery may be responsible for impaired insulin biosynthesis under conditions like glucose toxicity.