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Related Concept Videos

Polytene Chromosomes02:04

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Polytene chromosomes are giant interphase chromosomes with several DNA strands placed side by side. They were discovered in the year 1881 by Balbiani in salivary glands, intestine, muscles, malpighian tubules, and hypoderm of larvae Chironomus plumosus. Hence, these are also called "Salivary gland chromosomes." These are found in insects of the order Diptera and Collembola; in certain organs of mammals; and synergids, antipodes of flowering plants. Polytene chromosomes are also...
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Author Spotlight: Investigating mRNA Spatial Distribution in Drosophila Muscle Tissue
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Flying High-Muscle-Specific Underreplication in Drosophila.

J Spencer Johnston1, Mary E Zapalac2, Carl E Hjelmen3

  • 1Department of Entomology, Texas A&M University, College Station, TX 77843, USA.

Genes
|March 1, 2020
PubMed
Summary

Fruit flies exhibit DNA underreplication in thoracic nuclei, with specific muscles showing distinct S phase stalling patterns. This difference offers new insights into genome regulation and cell cycle control.

Keywords:
Drosophila melanogasterDrosophila virilisG0G1endocycleflow cytometryindirect flight musclepolyploidy

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Area of Science:

  • Developmental Biology
  • Cell Biology
  • Genetics

Background:

  • Polytene tissues in Drosophila, like salivary glands, undergo DNA replication with underreplication.
  • Thoracic nuclei show varied S phase progression, with only about half initiating DNA synthesis.
  • The reasons for this differential S phase initiation and stalling in thoracic nuclei remain unclear.

Purpose of the Study:

  • To investigate the heterogeneity in DNA underreplication and S phase stalling within Drosophila thoracic nuclei.
  • To identify specific thoracic tissues responsible for the observed underreplication phenotypes.
  • To explore the implications of differential underreplication for understanding heterochromatin, DNA replication control, and endocycle regulation.

Main Methods:

  • Utilized flow cytometry to analyze DNA content and cell cycle progression in Drosophila thoracic tissues.
  • Dissected individual thoracic tissues to assess underreplication phenotypes at the tissue-specific level.
  • Quantified the proportion of nuclei exhibiting stalled DNA synthesis during S phase.

Main Results:

  • Identified the indirect flight muscles as a primary site of DNA underreplication in the thorax.
  • Observed that dorsal longitudinal muscles (DLM) exhibit a significant proportion of nuclei stalling in S phase, with approximately half-replicated DNA.
  • Found that the dorsal ventral flight muscle also contributes to underreplication, but with an earlier replication stall point and initiation of the endocycle.

Conclusions:

  • Differential underreplication and S phase stalling exist between distinct muscle types within the Drosophila thorax.
  • The varying replication stall points and endocycle initiation provide a novel system to study mechanisms of heterochromatin regulation and cell cycle control.
  • These findings highlight tissue-specific regulation of DNA replication and ploidy in multicellular organisms.