Global Problem: Mercury Changing DNA along Entire Food Chain
The mercury found at very low concentrations in water is concentrated along the entire food chain, from algae via zooplankton to small fish and on to the largest fish — the ones we eat. Mercury causes severe and irreversible neurological disorders in people who have consumed highly contaminated fish.
The UNIGE research team is led by Vera Slaveykova, professor of environmental biogeochemistry and ecotoxicology in the Department F.A. Forel for environmental and aquatic sciences, and vice-president of the School of Earth and environmental sciences, Faculty of Sciences of the UNIGE. The scientists selected a green microalga measuring barely six microns by ten, known as Chlamydomonas reinhardtii. The alga was chosen not because of its colour or the two flagella it uses to swim but because, of all the primary producers in the aquatic environment at the the lowest level of the food chain of the food chain, it is the one whose genome has been fully sequenced. The availability of this genomic information made it possible to compare gene expression of algae exposed to different concentrations of mercury and to determine the associated effects.
Mercury disrupts the metabolism of algae
The researchers were able to analyse the transcriptome of the microalgae — i.e. the set of all RNA molecules that controls the expression of their genes — using molecular biology tools. As professor Slaveykova explains: “We were able to accurately determine which were over-expressed or, on the contrary, under-expressed as a result of exposure to mercury.” And the conclusion was clear: mercury disrupted the metabolism of algae, with numerous genes being deregulated, regardless of whether the concentrations were comparable with those set by European environmental standards, lower or higher than those usually found in the environment.
An alga that seems healthy from a physiological point of view appears altered when its gene’s expression is examined. The dysregulated genes are involved in diverse processes, from the generation of reactive oxygen species triggering antioxidant defence to the alteration of the flagella and cell motility. The photosynthesis and transport of essential elements such as zinc, iron or copper are also affected.
The accumulation of mercury in fish, together with its impact on human health, have been the subject of numerous studies since the Minamata disaster, when the population of this eponymous Japanese fishing harbour was hit by large-scale pollution in the mid-twentieth century. However, thanks to the transcriptomic approach adopted by the UNIGE researchers, we now know how mercury enters the food chain and affects the microalgae at its base.
An environmental and public health issue
Although mercury is found naturally in the environment (it is emitted, for example, when a volcano erupts), its concentration has been steadily increasing because of human activity: by burning coal or releasing mercury as part of various industrial processes. It is now estimated that over half the mercury in the air is linked to human activities, and that the ratio is nearly two-thirds in the aquatic environment. And it is a global problem since high levels of mercury have been detected in the blood of polar bears, far from any source of contamination. It is crucial, therefore, that we understand the governing mechanisms, both from an environmental and public health perspective.
Contacts and sources:
Citation: “Cellular toxicity pathways of inorganic and methyl mercury in the green microalga Chlamydomonas reinhardtii IHg and MeHg impact in Chlamydomonas reinhardtii”
Rebecca Beauvais-Flück, Vera I. Slaveykova, Claudia Cosio*
Source:
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