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Related Experiment Videos

An analysis of sponge genomes.

Maria Costantini1

  • 1Laboratorio di Evoluzione Molecolare, Stazione Zoologica Anton Dohrn, Villa Comunale, Napoli 80121, Italy. mcosta@szn.it

Gene
|November 6, 2004
PubMed
Summary

Sponges

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Area of Science:

  • Marine biology
  • Genomics
  • Molecular biology

Background:

  • Previous research on sponge genomes, specifically Geodia cydonium, reported complex DNA profiles.
  • These profiles suggested a multimodal cesium chloride (CsCl) gradient, indicating multiple DNA types within the genome.

Purpose of the Study:

  • To re-examine the genome of Geodia cydonium and Suberites domuncula.
  • To clarify the nature of sponge DNA profiles and identify the source of previously reported complexity.

Main Methods:

  • Cesium chloride (CsCl) density gradient ultracentrifugation was used to analyze DNA from G. cydonium and S. domuncula.
  • DNA profiles were analyzed to determine their distribution and characteristics.

Main Results:

  • DNA from both G. cydonium and S. domuncula exhibited unimodal CsCl profiles.
  • The previously reported multimodal profiles were attributed to contamination by prokaryotic and eukaryotic microorganisms.

Conclusions:

  • The native genome of sponges, G. cydonium and S. domuncula, is characterized by a unimodal DNA profile.
  • Contaminating microorganisms, not the sponge genome itself, caused the complex DNA profiles observed in earlier studies.

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