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Título: | Population and seasonal variations in the zebra mussel transcriptome: Physiological changes and environmental inputs |
Autor: | Piña, Benjamín CSIC ORCID ; Campos, Bruno CSIC ORCID; Faria, Melissa CSIC ORCID; Casado, Marta CSIC ORCID ; Blázquez, Mercedes CSIC ORCID ; Torreblanca, Amparo; Fernández-Sanjuan, María; Lacorte Bruguera, Silvia CSIC ORCID; Navarro Cuenca, Anna CSIC; Barata Martí, Carlos CSIC ORCID | Fecha de publicación: | 13-may-2013 | Citación: | 23rd SETAC Europe Annual Meeting. Abstracts: 2 (2013) | Resumen: | The zebra mussel Dreissena polymorpha is a Caspian Sea bivalve that colonized freshwater bodies worldwide during the XX century. To analyze the impact of seasonal and environmental variations on the physiology and metabolism of this invasive species, we developed a custom microarray using 4057 publicly available DNA sequences from Dreissena and other related genera. Seasonal variations of transcriptome profiles were analyzed using half-body samples from a relatively clean site (Riba-Roja, low Ebro River, N.E. Spain), at three different stages of the annual cycle: Pre-spawning (February), spawning (June), and gonad resorption (September). Transcripts from a total of 745 unique sequences showed significant changes among these three groups of samples. Functional characterization of these transcripts based on their closest known homologues showed that genes involved in stress defense (oxidative and infection) were overrepresented in September, whereas genes related to reproductive functions were overrepresented in the spawning and pre-spawning periods. Transcriptomic analyses of gill samples from six populations in the low Ebro showed a clear differentiation between upstream and downstream populations. These differences correlated positively with heavy metals (Cu, Cd, Mn, Ni, Zn) loads, and negatively with indexes of general fitness, like lipid content or tissue condition index. No physiological or reproductive effects were linked to mercury and organochlorine compounds, present at the most downstream Ebro sites due to the activity of a chlor-alkali factory operating in Flix. We concluded that heavy metals were the main stressors for these zebra mussel populations and that this species is resilient to other pollutants proved to be extremely toxic to vertebrates. Results also show that zebra mussel populations having very low genetic differentiation may acclimate to different levels and forms of pollution through modulations in their transcriptomic profile. Our studies may help to identify developmental stages and environmental conditions at which the organism is more vulnerable for future control strategies | Descripción: | 23rd Annual Meeting of the Society of Environmental Toxicology and Chemistry (SETAC Europe), 12-16 May 2013, Glasgow | Versión del editor: | http://meetings.setac.org/frontend.php/program_display/downloads | URI: | http://hdl.handle.net/10261/89803 |
Aparece en las colecciones: | (ICM) Comunicaciones congresos (IDAEA) Comunicaciones congresos |
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