Captured: Mysterious oyster killers

July 25, 2013
Captured: Mysterious oyster killers
Left: This is an oyster covered in green lesions caused by Denman Island disease. Right: This is a close-up look at the Mikrocytos mackini parasite. Credit: UBC/Department of Fisheries and Oceans

University of British Columbia researchers have apprehended tiny, elusive parasites that have plagued oysters from British Columbia to California.

First reported in 1960, Denman Island disease is caused by Mikrocytos mackini, a parasite that infects mainly Pacific oysters, and leads to unsightly green lesions and death.

"M. mackini has eluded capture for more than 50 years because it lives inside the oyster's cells and has proved impossible to grow and study in a lab," says Patrick Keeling a professor in UBC's Department of Botany who led the microbial investigative team.

The research team from UBC and the Department of Fisheries and Oceans isolated the from infected oysters and analyzed their genes. Details are published today in the journal Current Biology.

"We figured out where M. mackini came from in the evolutionary tree of life – it is part of an enigmatic group of amoebae called Rhizaria that was only itself discovered a few years ago," says Keeling, director of the Centre for Microbial Diversity and Evolution at UBC and a Fellow of Canadian Institute for Advanced Research.

"These parasites have an extremely reduced metabolism. They can't survive in oxygen and its – or cellular powerhouse – can't produce energy, so they probably steals most things from the oyster host in order to survive."

While not considered a to humans, the Denman Island disease makes the raw delicacy unappealing. In B.C., oyster production in 2011 totalled 7,500 tonnes and was valued at $9.2 million.

Explore further: Single-cell parasites co-opt 'ready-made' genes from host: study

Related Stories

The Pacific oyster is in Sweden to stay

March 22, 2011

The Pacific oyster was discovered in large numbers along the west coast of Sweden in 2007. The mortality rate in some places during the past two winters has been 100%, but researchers at the University of Gothenburg who have ...

Recommended for you

Cow gene study shows why most clones fail

December 9, 2016

It has been 20 years since Dolly the sheep was successfully cloned in Scotland, but cloning mammals remains a challenge. A new study by researchers from the U.S. and France of gene expression in developing clones now shows ...

Blueprint for shape in ancient land plants

December 9, 2016

Scientists from the Universities of Bristol and Cambridge have unlocked the secrets of shape in the most ancient of land plants using time-lapse imaging, growth analysis and computer modelling.

0 comments

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.