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Related Experiment Video

Updated: Dec 13, 2025

Droplet Barcoding-Based Single Cell Transcriptomics of Adult Mammalian Tissues
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Comparative transcriptomics of primary cells in vertebrates.

Tanvir Alam1, Saumya Agrawal2, Jessica Severin2

  • 1College of Science and Engineering, Hamad Bin Khalifa University, Doha, Qatar.

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Summary
This summary is machine-generated.

Species share conserved gene expression for core cellular functions but diverge in genes for intercellular communication. This highlights evolutionary constraints on essential gene regulation while allowing for species-specific traits.

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Area of Science:

  • Comparative genomics
  • Evolutionary biology
  • Transcriptomics

Background:

  • Gene expression differences between species can arise from distinct cellular programs or tissue compositions.
  • Understanding conserved vs. diverged gene expression is crucial for comparative biology.

Purpose of the Study:

  • To compare gene expression profiles in homologous primary cells across human, mouse, rat, dog, and chicken.
  • To identify conserved and diverged gene expression patterns and their evolutionary implications.

Main Methods:

  • Utilized Cap Analysis Gene Expression (CAGE) and short RNA (sRNA) sequencing data from the FANTOM5 project.
  • Analyzed expression profiles of orthologous genes and microRNAs (miRNAs) across species.
  • Performed motif activity analysis to assess transcription factor binding conservation.

Main Results:

  • Orthologous gene expression is highly correlated across cell types, but many genes show differential expression between species.
  • Genes involved in transcription and RNA processing are more conserved; genes for intercellular communication are more diverged.
  • Evolutionary older genes and miRNAs exhibit more conserved expression patterns.
  • Promoters and enhancers are activated by conserved transcription factors across species.

Conclusions:

  • Core gene regulatory networks are conserved across species.
  • Divergence in cell-to-cell communication genes likely drives phenotypic differences between species.
  • Evolutionary age is a significant factor in the conservation of gene and miRNA expression.