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In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
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Sedentary Behavior Impacts on the Epigenome and Transcriptome: Lessons from Muscle Inactivation in Drosophila Larvae.

Avivit Brener1, Dana Lorber2, Adriana Reuveny2

  • 1Pediatric Endocrinology and Diabetes Institute, Dana-Dwek Children's Hospital, Tel Aviv Sourasky Medical Center, Affiliated with the Faculty of Medicine, Tel Aviv University, Tel Aviv 6997801, Israel.

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Sedentary behavior in early life alters gene expression and epigenetic marks in fruit fly muscles. This study reveals molecular changes linked to metabolic dysfunction, offering insights into human health.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Developmental Biology

Background:

  • Sedentary lifestyles are linked to metabolic diseases, but the underlying biological mechanisms are not fully understood.
  • Early-life sedentary behavior's impact on cellular and molecular pathways requires further investigation.

Purpose of the Study:

  • To investigate the transcriptional and epigenetic consequences of early-life muscle inactivity.
  • To identify specific genes and molecular pathways affected by sedentary behavior in a model organism.

Main Methods:

  • Induced temporal muscle inactivation in Drosophila larvae using a temperature-sensitive shibire (shi) mutation.
  • Utilized whole-genome analysis with muscle-specific targeted DamID (TaDa) to assess RNA Pol II binding.
  • Analyzed changes in epigenetic profiles and chromatin modifications.

Main Results:

  • Muscle inactivity significantly altered RNA Pol II binding in 6% of genes, with a notable enrichment in long non-coding RNAs (lncRNAs).
  • Suppressed protein-coding genes were associated with longevity, DNA repair, muscle function, and proteostasis.
  • Muscle inactivation impacted chromatin modifications, altering the balance of active and inactive epigenetic marks.

Conclusions:

  • Early-life muscle inactivity induces widespread transcriptional and epigenetic changes in Drosophila.
  • Downregulated genes are critical for muscle function, metabolism, and longevity.
  • Findings in Drosophila may provide a molecular basis for understanding the link between sedentary behavior and human metabolic diseases.