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Related Concept Videos

Epigenetic Regulation01:46

Epigenetic Regulation

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Epigenetic changes alter the physical structure of the DNA without changing the genetic sequence and often regulate whether genes are turned on or off. This regulation ensures that each cell produces only proteins necessary for its function. For example, proteins that promote bone growth are not produced in muscle cells. Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
X-chromosome...
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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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A Combinatorial Single-cell Approach to Characterize the Molecular and Immunophenotypic Heterogeneity of Human Stem and Progenitor Populations
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Single-cell multimodal profiling reveals cellular epigenetic heterogeneity.

Lih Feng Cheow1, Elise T Courtois2, Yuliana Tan2

  • 1Institute of Molecular and Cell Biology, Singapore.

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Summary

This study introduces a new method for single-cell analysis, enabling simultaneous genotyping, gene expression, and DNA methylation profiling. This approach overcomes sample heterogeneity to reveal epigenetic variations in different cell types.

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Area of Science:

  • Molecular Biology
  • Genomics
  • Epigenetics

Background:

  • Sample heterogeneity in bulk analysis can obscure important biological signals from specific cell populations.
  • Understanding cellular heterogeneity is crucial for diagnosing diseases like lung adenocarcinoma and studying cell reprogramming.

Purpose of the Study:

  • To develop and validate a method for simultaneous single-cell genotyping, gene expression, and DNA methylation analysis.
  • To apply this method to investigate epigenetic variation in lung adenocarcinomas and reprogramming fibroblasts.

Main Methods:

  • A targeted, multimodal approach was developed using an automated, high-throughput microfluidic platform.
  • The method integrates single-cell genotyping with the interrogation of DNA methylation and gene expression at multiple loci.
  • Cellular identity was determined through combined genotyping and transcriptional profiling.

Main Results:

  • The method successfully profiled epigenetic variation across distinct cell types within complex samples.
  • It allowed for the simultaneous assessment of genetic, transcriptomic, and epigenomic information at the single-cell level.
  • Application to lung adenocarcinomas and reprogramming fibroblasts revealed cell-type-specific epigenetic signatures.

Conclusions:

  • This high-throughput, multimodal single-cell analysis platform effectively addresses challenges posed by sample heterogeneity.
  • The approach provides a powerful tool for dissecting cellular heterogeneity and epigenetic variation in various biological contexts.
  • It facilitates deeper insights into disease mechanisms and cellular processes like reprogramming.