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Characterization of the Bacterial Communities Associated with the Bald Sea Urchin Disease of the Echinoid Paracentrotus Lividus

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Characterization of the Bacterial Communities Associated with the Bald Sea Urchin Disease of the Echinoid Paracentrotus Lividus Available online at www.sciencedirect.com Journal of INVERTEBRATE PATHOLOGY Journal of Invertebrate Pathology 98 (2008) 136–147 www.elsevier.com/locate/yjipa Characterization of the bacterial communities associated with the bald sea urchin disease of the echinoid Paracentrotus lividus Pierre T. Becker a,*, Emilie Egea b, Igor Eeckhaut a,* a Laboratoire de biologie marine, Universite´ de Mons-Hainaut, 6 avenue du Champ de Mars, 7000 Mons, Belgium b UMR6540 DIMAR, Centre Oce´anologique de Marseille, Universite´ Marseille 2, Station marine d’Endoume, rue de la Batterie des Lions, 13007 Marseille, France Received 10 September 2007; accepted 6 December 2007 Available online 15 December 2007 Abstract The microbial communities involved in the bald sea urchin disease of the echinoid Paracentrotus lividus are investigated using culture- independent techniques. Lesions of diseased specimens from two locations in France, La Ciotat (Mediterranean Sea) and Morgat (Atlan- tic Ocean), are examined by Scanning Electron Microscopy (SEM) and the diversity of their microbiota is analysed by Denaturing Gra- dient Gel Electrophoresis (DGGE) and 16S rRNA gene clones libraries construction. Microscopic observations demonstrated that only the central area of the lesions is invaded by bacteria but not the peripheral zone and the surrounding healthy tissues. Molecular analysis identified at least 24 bacterial genomospecies in bald sea urchin lesions: 5 are Alphaproteobacteria, 10 are Gammaproteobacteria, 8 are CFB bacteria and 1 is a Fusobacteria. Out of them, 4 are observed in both locations while 10 occur only in the Atlantic Ocean and 10 only in the Mediterranean Sea. Gammaproteobacteria are the most represented in clones libraries from both locations, with respec- tively 65% and 43% of the total clones. CFB and Alphaproteobacteria accounted for the majority of the remaining clones and were detected by DGGE in virtually all samples from both stations. Our results demonstrate that bacterial communities observed on diseased individuals of the same echinoid species but originating from distinct locations are not similar and thus support the hypothesis that bac- teria involved in the worldwide echinoid disease commonly called the bald sea urchin disease are opportunistic and not specific. Ó 2007 Elsevier Inc. All rights reserved. Keywords: Bald sea urchin disease; Paracentrotus lividus; Bacterial community; DGGE; Cloning; Mediterranean; Atlantic 1. Introduction green to black central area where the calcareous skeleton is exposed to the external medium and a surrounding Bacterial diseases involving sea urchins have been peripheral belt of necrotic epidermal tissues. Occasionally, described in most oceans, especially in the Northern hemi- the perforation of the test occurs, leading to the death of sphere where they caused dramatic mass mortalities. To the individuals (Jangoux, 1990). These symptoms, referred our knowledge, 19 echinoid species, coming not only from to the ‘‘bald sea urchin disease’’, were first described by the wild environment but also from aquacultures and lab- Johnson (1971) in Strongylocentrotus franciscanus in oratories aquaria, are known to be affected by bacterial 1970 along the US Californian coast. In the late 1970s, infections (Table 1). The latter are characterized in most reports were made of severe outbreaks affecting several cases by body wall lesions where spines, podia, pedicellar- species of regular echinoids in the Mediterranean Sea ia and epidermis are lost. Typical lesions, ranging from a (Ho¨baus et al., 1981) but also, at lower incidence, along few millimetres to a third of the body surface, show a the French coasts of the Atlantic Ocean and the English Channel (Maes and Jangoux, 1984a). More recently, Taj- ima et al. (1997a) studied a similar disease in reared * Corresponding authors. Fax: +32 65 373 434. E-mail addresses: [email protected] (P.T. Becker), igor.eec- Strongylocentrotus intermedius in Japan and named it [email protected] (I. Eeckhaut). the spotting disease. 0022-2011/$ - see front matter Ó 2007 Elsevier Inc. All rights reserved. doi:10.1016/j.jip.2007.12.002 P.T. Becker et al. / Journal of Invertebrate Pathology 98 (2008) 136–147 137 Table 1 Bacterial diseases affecting sea urchins Sea urchin Geographical area Associated bacteria Method of identification References Allocentrotus NE Pacific (California), Unknown Boolootian et al. (1959), Giese fragilis laboratory conditions (1961) Arbacia lixula Mediterranean Sea Unknown Ho¨baus et al. (1981), Maes and Jangoux (1984a) Archaeopneustes Caribbean (Bahamas), Vibrio alginolyticus Bacterial cultures and Bauer and Young (2000) hystrix laboratory conditions phenotypic tests Cidaris cidaris Mediterranean Sea Unknown Jangoux (1990) Diadema Caribbean Unknown waterborne, host-specific Bacterial cultures and Lessios et al. (1984), Bauer antillarum agent, perhaps Clostridium perfringensa phenotypic tests and Agerter (1987) and C. sordellia Echinometra Indian Ocean Unknown Vaı¨tilingon et al. (2004) mathaei (Madagascar) Echinus esculentus NE Atlantic (Brittany, Unknown Maes and Jangoux (1984a) France) Hemicentrotus NW Pacific (Japan), sea Unknown Kanai (1993) pulcherrinus urchin farms Meoma ventricosa Caribbean (Curac¸ao) Pseudoalteromonas sp. Not stated Nagelkerken et al. (1999) Paleopneustes Caribbean (Bahamas), Vibrio alginolyticus Bacterial cultures and Bauer and Young (2000) cristatus laboratory conditions phenotypic tests Paracentrotus NE Atlantic (Brittany, CFB, Alpha- and 16S rRNA gene sequencing Maes and Jangoux (1984a), lividus France) and Gammaproteobacteria including Vibrio Maes and Jangoux (1984b), Mediterranean Sea sp. and Colwellia sp. present study Psammechinus English Channel Unknown Maes and Jangoux (1984a) miliaris (Normandy, France) Pseudocentrotus NW Pacific (Japan), sea Unknown Kanai (1993) depressus urchin farms Sphaerechinus NE Atlantic (Brittany, Unknown Ho¨baus et al. (1981), Maes granularis France) and and Jangoux (1984a) Mediterranean Sea Strongylocentrotus NW Atlantic (Nova Acinetobacter sp., Alcaligenes sp. Bacterial cultures and Roberts-Regan et al. (1988) droebachiensis Scotia) phenotypic tests Strongylocentrotus NE Pacific (California) Unknown Johnson (1971), Pearse et al. franciscanus (1977) Strongylocentrotus NW Pacific (Japan), sea Flexibacter sp., Vibrio sp.a Bacterial cultures, Tajima et al. (1997a), Tajima intermedius urchin farms phenotypic tests and et al. (1997b), Takeuchi et al. DNA–DNA homology (1999) Strongylocentrotus NE Pacific (California) Aeromonas salmonicida, Bacterial cultures and Johnson (1971), Gilles and purpuratus Flavobacterium spp., Pseudomonas sp., phenotypic tests Pearse (1986) Vibrio anguillarum Tripneustes Indian Ocean CFB, Exiguobacterium sp., Alpha- and Bacterial cultures and 16S Becker et al. (2007) gratilla (Madagascar) Gammaproteobacteria including Vibrio rRNA gene sequencing spp. a Bacteria associated with systemic diseases, with spines loss but without obvious body wall lesions. Etiological agents of these diseases are bacteria that niques in order to obtain a more complete identification need a mechanical damage of the body wall to induce the of these communities compared to bacterial cultures-based infection (Jangoux, 1990). In a study based on bacterial analyses performed in previous studies. cultures, Gilles and Pearse (1986) isolated 14 strains from infected Californian echinoids. All strains belonged to the 2. Materials and methods Aeromonas, Flavobacterium, Pseudomonas or Vibrio genera but only Aeromonas salmonicida and Vibrio anguillarum 2.1. Sampling and morphological analyses were pathogenic. In Japanese farms, a Flexibacter bacte- rium has been identified as the causative agent of the spot- Diseased Paracentrotus lividus (Lamarck, 1816) with ting disease (Tajima et al., 1997b). In Europe, although bald lesions similar to those described by Maes and Jangoux sea urchins are still encountered, no study was performed to (1984a) were collected by hand at low tide in Morgat identify the microorganisms that infect the lesions. (Atlantic coast, Brittany, France) and by diving near La In the present work, we investigated the microbial com- Ciotat (Mediterranean coast, France) in February 2006. munities that colonize bald sea urchin lesions of Paracen- They were found in low incidences of about 1 per 100 trotus lividus populations of the French Mediterranean and 1 per 1000 individuals in Morgat and La Ciotat, and Atlantic coasts. We used culture-independent tech- respectively. For each station, lesions from 5 individuals 138 P.T. Becker et al. / Journal of Invertebrate Pathology 98 (2008) 136–147 were directly dissected and fixed in non-acetic Bouin’s fluid DGGE bands were excised from the gels for sequencing for SEM while 3 other samples were immersed in absolute and identification. At least one band per position and per ethanol for molecular analysis. station has been sequenced. The acrylamide with the Some fresh lesions were observed and photographed with DNA was crushed in microcentrifuge tubes containing a Leica MZ8 binocular equipped with a Nikon Coolpix 990 300 ll of Tris 10 mM–EDTA 1 mM. After one night at camera. For SEM, fixed samples were dehydrated through 4 °C, the tubes were centrifuged and the DNA, present in a graded series of ethanol (50%, 70%, 90% and 100%), crit- the supernatant, was precipitated with ethanol. DNA ical-point dried, mounted on stubs, coated with gold and obtained after precipitation was used for a new touch- examined with a Jeol JSM-6100 electron microscope. down-PCR amplification
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