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Related Experiment Videos

A Feldmannia algal virus has two genome size-classes

R G Ivey1, E C Henry, A M Lee

  • 1Department of Botany and Plant Pathology, Oregon State University, Corvallis 97331-2906, USA.

Virology
|June 15, 1996
PubMed
Summary

Persistent viruses were discovered within brown algae of the Feldmannia genus. Instead of spores, these algae produce millions of polyhedral viruses, revealing a novel viral replication strategy.

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Area of Science:

  • Marine Biology
  • Virology
  • Phycology (Study of Algae)

Background:

  • Persistent viruses are known to occur intracellularly in brown algae, particularly within the Ectocarpales order.
  • The genus Feldmannia, comprising small filamentous brown algae, is identified as a host for these viruses.

Purpose of the Study:

  • To characterize a novel viral infection within the brown alga Feldmannia.
  • To investigate the nature of viral particles replacing normal spore formation in sporangia.

Main Methods:

  • Microscopic observation of Feldmannia sporangia to identify viral particle formation.
  • Isolation and characterization of viral dsDNA genomes (158 and 178 kbp).
  • Construction of a cosmid library for generating circular restriction enzyme maps (BamHI, NotI, PstI).

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Main Results:

  • Feldmannia sporangia were found to contain approximately 10^6 polyhedral viruses per cell instead of haploid zoospores.
  • Two distinct double-stranded DNA (dsDNA) genome classes, 158 and 178 kilobase pairs (kbp), were identified, each with two restriction site variants.
  • The relative abundance of each viral genome was influenced by culture temperature.
  • Circular restriction maps were generated for the viral genomes.

Conclusions:

  • This study reports the intracellular occurrence of polyhedral viruses in the brown alga Feldmannia, replacing typical zoospore production.
  • The characterization of two dsDNA genome classes and their temperature-dependent abundance provides insights into viral biology in algae.
  • The findings contribute to understanding the complex interactions between viruses and marine eukaryotic hosts.