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Determination01:51

Determination

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During embryogenesis, cells become progressively committed to different fates through a two-step process: specification followed by determination. Specification is demonstrated by removing a segment of an early embryo, “neutrally” culturing the tissue in vitro—for example, in a petri dish with simple medium—and then observing the derivatives. If the cultured region gives rise to cell types that it would normally generate in the embryo, this means that it is specified. In...
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Combinatorial gene control is the synergistic action of several transcriptional factors to regulate the expression of a single gene. The absence of one or more of these factors may lead to a significant difference in the level of gene expression or repression.
The expression of more than 30,000 genes is controlled by approximately 2000-3000 transcription factors. This is possible because a single transcription factor can recognize more than one regulatory sequence. The specificity in gene...
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Related Experiment Video

Updated: Feb 22, 2026

Analysis of Retinoic Acid-induced Neural Differentiation of Mouse Embryonic Stem Cells in Two and Three-dimensional Embryoid Bodies
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Expression analyzes of early factors in midbrain differentiation programs.

Simone Mesman1, Sonja J Krüse1, Marten P Smidt1

  • 1Swammerdam Institute for Life Sciences, FNWI University of Amsterdam, The Netherlands.

Gene Expression Patterns : GEP
|September 30, 2017
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Summary

Researchers identified six novel factors crucial for mesodiencephalic dopaminergic (mdDA) neuron development. This study sheds light on how neural progenitors commit to mdDA neuronal cell-fate and differentiate into specific subsets.

Keywords:
DevelopmentExpression analysisMidbrain dopamine neurons

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Genetics

Background:

  • Mesodiencephalic dopaminergic (mdDA) neurons, essential for midbrain function, originate in the ventricular zone (VZ) between embryonic days 10-12.
  • While sharing markers like Th and Pitx3, mdDA neurons comprise distinct subsets, each regulated by unique transcription factors and signaling pathways.
  • The precise mechanisms governing neural progenitor commitment to mdDA cell-fate and subsequent subset specification remain largely unknown.

Purpose of the Study:

  • To investigate the molecular mechanisms underlying the development and specification of mdDA neurons.
  • To identify novel genes involved in early mdDA neuron differentiation and cell-fate commitment.

Main Methods:

  • Comparative genome-wide expression analysis of dissected midbrain tissue (E10.5-E13.5) and adult mdDA regions.
  • Integration of expression data from PITX3-GFP sorted mdDA neurons (E12.5-E15.5) with existing datasets.
  • Analysis of gene expression profiles during embryonic and adult stages, correlated with tyrosine hydroxylase (TH) staining to track mdDA neuron appearance.

Main Results:

  • Genes were categorized based on their expression patterns during mdDA neuron differentiation: upregulated throughout (Mest, NeuroD1, Tcf12), early upregulation (Hes5, Tcf3), and late upregulation (Enc1).
  • Expression profiles of these genes were mapped across embryonic development and adult stages.
  • Six novel factors were identified as potentially playing roles in neural progenitor cell-fate commitment or mdDA neuron differentiation.

Conclusions:

  • The study identified key genes and their temporal expression patterns during mdDA neuron development.
  • Six novel factors have been pinpointed as potential regulators of mdDA neuron cell-fate commitment and differentiation.
  • This research provides valuable insights into the complex processes governing midbrain dopaminergic neuron development.