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Related Experiment Video

Updated: Sep 6, 2025

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Comparative Study of Transcriptome in the Hearts Isolated from Mice, Rats, and Humans.

Daigo Okada1, Yosuke Okamoto2, Toshiro Io3

  • 1Center for Genomic Medicine, Graduate School of Medicine, Kyoto University, Shogoinkawahara-cho, Kyoto 606-8507, Japan.

Biomolecules
|June 24, 2022
PubMed
Summary
This summary is machine-generated.

This study reveals significant species differences in heart gene expression, particularly in the sinoatrial node (SA). It identifies SHOX2 as a key SA-specific transcription factor crucial for heart function across species.

Keywords:
SHOX2hearttranscriptome

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Area of Science:

  • Cardiovascular Biology
  • Comparative Genomics
  • Molecular Cardiology

Background:

  • Heartbeat mechanisms are vital, but species-specific differences in gene expression remain understudied.
  • Understanding conserved and divergent genes is crucial for studying universal and unique heart functions across mammals.

Purpose of the Study:

  • To analyze and compare transcriptome data from mouse, rat, and human heart regions (atria, ventricles, sinoatrial nodes).
  • To identify genes with species-specific expression patterns and novel cardiac regional markers.
  • To investigate the role of SHOX2 in sinoatrial node function.

Main Methods:

  • Transcriptome data from mouse, rat, and human heart tissues were analyzed.
  • Specificity Measure (SPM) values were calculated to assess species-specific gene expression.
  • Gene ontology analysis was performed to identify functional differences.

Main Results:

  • Species differences were most pronounced in the sinoatrial node (SA).
  • SHOX2 was identified as a highly conserved, SA-specific transcription factor.
  • Novel atrial-, ventricular-, and SA-specific gene markers were discovered, along with 70 cardiac region- and species-specific ontologies.

Conclusions:

  • Reanalyzing existing transcriptome data using SPM values can uncover novel tissue-specific genes and species-dependent expression patterns.
  • SHOX2 is highlighted as a critical SA-specific transcription factor with conserved importance.
  • The study provides insights into cardiac regional and species-dependent gene expression, advancing our understanding of heart biology.