Related Experiment Videos

A Core Transcription Regulatory Circuitry Defining Microglia Cell Identity Inferred from the Reanalysis of Multiple

Antoine Aubert1, François Stüder1, Bruno Maria Colombo1

  • 1Génomique Métabolique, Genoscope, Institut François Jacob, CEA, CNRS, Univ Evry, Université Paris-Saclay, 91057 Evry, France.

Brain Sciences
|October 23, 2021
PubMed

Insights

Researchers identified key gene regulators for creating microglia, the brain's immune cells, from human stem cells. This work helps improve methods for studying neurodegenerative diseases like Alzheimer's.

Area of Science:

  • Neuroscience
  • Immunology
  • Stem Cell Biology

Background:

  • Microglia are crucial brain immune cells implicated in neurodegenerative diseases.
  • In vivo studies are limited by invasive procedures.
  • Human pluripotent stem cell-derived microglia offer a promising in vitro model.

Purpose of the Study:

  • To analyze and compare existing protocols for differentiating human pluripotent stem cells into microglia.
  • To identify a core set of transcription factors essential for microglia identity.
  • To highlight differences between protocols and suggest improvements.

Main Methods:

  • Re-analysis of transcriptomic data from six distinct microglia differentiation protocols.
  • Comparative analysis to identify conserved and divergent regulatory elements.
  • Bioinformatic analysis of gene expression patterns.

Main Results:

  • A consensus core of master transcription regulatory circuitry defining microglia identity was revealed.
  • Significant variations in differentiation efficiency and purity were observed among protocols.
  • Key gene expression signatures distinguishing different protocols were identified.

Conclusions:

  • Established protocols show a common regulatory network for microglia differentiation.
  • Understanding protocol-specific divergencies is key to optimizing microglia models.
  • Further refinement of differentiation assays can advance research into neurodegenerative conditions.
Keywords:
gene regulatory networksmicroglia differentiationsystems biologytranscriptomics

Related Concept Videos

Somatic to iPS Cell Reprogramming01:29

Somatic to iPS Cell Reprogramming

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...
2.3K
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...
7.2K
iPS Cell Differentiation01:22

iPS Cell Differentiation

The ability of induced pluripotent stem cells or iPSCs to differentiate into most body cell types has stimulated repair and regenerative medicine research over the past few decades. iPSC-derived blood cells, hepatocytes, beta islet cells, cardiomyocytes, neurons, and other cell types can repair injuries or regenerate damaged tissue in diseases such as diabetes and neurodegenerative disorders.
2.9K
Regulation of Expression Occurs at Multiple Steps02:24

Regulation of Expression Occurs at Multiple Steps

Gene expression can be regulated at almost every step from gene to protein. Transcription is the step that is most commonly regulated. This involves the binding of proteins to short regulatory sequences on the DNA. This association can either promote or inhibit the transcription of a gene associated with the respective sequence.
Transcription results in the generation of precursor (pre-mRNA) that consists of both exons and introns, which needs further processing before being translated to a...
23.8K
Regulation of Expression at Multiple Steps01:23

Regulation of Expression at Multiple Steps

The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the...
1.1K
Chromatin Modification in iPS Cells01:32

Chromatin Modification in iPS Cells

Chromatin modification alters gene expression; therefore, scientists can add histone-modifying enzymes, histone variants, and chromatin remodeling complexes to somatic cells to aid reprogramming into pluripotent stem (iPS) cells.
Compact chromatin makes reprogramming difficult. Enzymes, such as histone demethylases and acetyltransferases, are often added during reprogramming to loosen the chromatin, making the DNA more accessible to transcription factors. Molecules that inhibit histone...
2.0K