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Diurnal Variation in Bacterioplankton Composition and DNA Damage in the Microbial Community from an Andean Oligotrophic Lake

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Diurnal Variation in Bacterioplankton Composition and DNA Damage in the Microbial Community from an Andean Oligotrophic Lake Rev Argent Microbiol. 2014;46(4):358-362 REVISTA ARGENTINA DE MICROBIOLOGÍA www.elsevier.es/ram BRIEF REPORT Diurnal variation in bacterioplankton composition and DNA damage in the microbial community from an Andean oligotrophic lake María V. Fernández-Zenoffa,b,*, María C. Estéveza, María E. Faríasa a Laboratorio de Investigaciones Microbiológicas de Lagunas Andinas (LIMLA), Planta Piloto de Procesos Industriales Microbiológicos (PROIMI), CCT, CONICET, Tucumán, Argentina b Instituto de Microbiología, Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán, Tucumán, Argentina Recibido el 6 de junio de 2014; aceptado el 2 de octubre de 2014 KEYWORDS Abstract CPD; Laguna Azul is an oligotrophic lake situated at 4,560 m above sea level and subject to a DGGE; high level of solar radiation. Bacterioplankton community composition (BCC) was analysed Andean lakes; by denaturing gradient gel electrophoresis and the impact of solar ultraviolet radiation Ultraviolet radiation was assessed by measuring cyclobutane pyrimidine dimers (CPD). Furthermore, pure cultures of Acinetobacter johnsonii A2 and Rhodococcus sp. A5 were exposed simulta- neously and CPD accumulation was studied. Gel analyses generated a total of 7 sequences belonging to Alpha-proteobacteria (1 band), Beta-proteobacteria (1 band), Bacteroidetes (2 bands), Actinobacteria (1 band), and Firmicutes (1 band). DGGE proÀ les showed minimal changes in BCC and no CPD was detected even though a high level of damage was found in biodosimeters. A. johnsonii A2 showed low level of DNA damage while Rhodococcus sp. A5 exhibited high resistance since no CPD were detected under natural UV-B exposure, suggesting that the bacterial community is well adapted to this highly solar irradiated environment. © 2014 Asociación Argentina de Microbiología. Published by Elsevier España, S.L. All rights reserved. * Corresponding author. E-mail address: [email protected] (M.V. Fernández-Zenoff). 0325-7541/ © 2014 Asociación Argentina de Microbiología. Publicado por Elsevier España, S.L. Todos los derechos reservados. Andean lakes 359 PALABRAS CLAVE Variación diurna de la composición bacterioplanctónica y daño en el ADN de la CPD; comunidad microbiana de una laguna oligotrófi ca de los Andes Electroforesis en gradiente Resumen desnaturalizante; La Laguna Azul es un ambiente oligotróÀ co localizado a 4560 m de altura y sometido a Lagunas andinas; elevados niveles de radiación solar. La composición de su comunidad bacterioplanctónica Radiación ultravioleta fue analizada empleando la técnica de electroforesis en gradiente desnaturalizante y se investigó el impacto de la radiación ultravioleta cuantiÀ cando los dímeros de pirimidina (CPD). Además, se expusieron simultáneamente cultivos puros de Acinetobacter johnsonii A2 y Rhodococcus sp. A5 para estudiar la acumulación de CPD. El análisis de los geles mostró siete secuencias pertenecientes a Alpha-proteobacteria (1 banda), Beta-proteobacteria (1 banda), Bacteroidetes (2 bandas), Actinobacteria (1 banda) y Firmicutes (1 banda). A lo largo del día se observaron cambios mínimos en la composición de la comunidad y no se detectaron CPD. A. johnsonii A2 presentó un daño bajo mientras que Rhodococcus sp. A5 no presentó daño en su ADN, sugiriendo que la comunidad bacteriana está muy bien adaptada a este ambiente altamente irradiado. © 2014 Asociación Argentina de Microbiología. Publicado por Elsevier España, S.L. Todos los derechos reservados. High Altitude Andean Wetlands (HAAW) have a broad range through a 100 μm Nitex mesh and duplicate samples were of extreme conditions such as high solar radiation Á uxes placed in 800 ml Plexiglas bottles that received full due to the combination of atmospheric and geographical radiation (UVR+PAR, 280-700 nm). The containers were factors1,4. Among the environmental factors, solar radiation then placed into 100 μm Nitex mesh frames that were and particularly ultraviolet radiation (UVR, 280-400 nm) attached to a buoy. At the beginning of the experiment, may have strong effects on the production, activity and sub-samples were processed for the determination of abundance of bacterioplankton13. In general, UVR causes bacterioplankton composition by DGGE and CPD. Incubation DNA damage. Ultraviolet B radiation (UV-B, 280-320 nm) was started at 11:00 (local hour) and 50 ml aliquots were causes direct damage through the generation of cyclobutane collected, by duplicate, at 13:00 and 15:00. Then, water pyrimidine dimers (CPD). These lesions block DNA and RNA samples were À ltered through 0.22 μm polycarbonate polymerase activities inhibiting gene replication and À lters, immediately frozen in l iquid nitrogen and kept at transcription8. î20 °C until DNA extraction. In addition, pure cultures of Previous studies at our lab demonstrated that the A. johnsonii A2 and Rhodococcus sp. A5, two bacteria bacterial communities from Laguna Negra and Laguna previously isolated from water of this lake6,15, were exposed Verde, both located next to Laguna Azul, were well adapted to natural radiation simultaneously with the lake water. to long-term artiÀ cial UV-B exposure, and in many cases Bacterial suspensions were prepared in the laboratory as it UV-B radiation even stimulated growth11. In situ exposure to was described by Farias et al.9 and maintained at 4 °C in natural radiation of water samples from Laguna Vilama, a the dark until in situ exposure. In Laguna Azul, the Plexiglas hyper saline lake located in the Argentinean Puna at 4,660 m bottles containing bacterial suspension were placed in above sea level (a.s.l.), suggest that the bacterioplankton anodized aluminum frames. After the incubation period, community is well adapted to this highly solar irradiated the samples were processed to determine CPD accumulation. environment showing little accumulation of CPD and few Controls of unexposed samples were run simultaneously in changes in the community composition9. darkness by wrapping the Plexiglas bottles with aluminum In this paper we carried out a survey of bacterioplankton foil. diversity in Laguna Azul (27° 34’ S and 65.8° 32’ W; 4,560 m DNA biodosimeters (naked calf thymus DNA used as a.s.l.) (Fig. 1) by using a À ngerprinting technique (DGGE) and control of DNA damage) were also incubated in situ to we assessed DNA damage in the plankton community, pure determine the DNA effective dose3. The CTAB protocol of cultures of Acinetobacter johnsonii A2 and Rhodococcus sp. DNA extraction was used10. To determine changes in A5 and biodosimeters measuring CPD throughout one day. bacterial assemblages, the variable V3 region of 16S was Incident solar radiation incident over the studied area was enzymatically ampliÀ ed by PCR with primers to conserved monitored during November 2006 (austral spring) using a regions of the 16S rRNA genes. The nucleotide sequences of broad-band European Light Dosimeter Network (ELDONET) the primers are as follows: primer 1 F341-GC: 5ȫ-CGC CCG radiometer (Real Time Computers). On the sampling day, CCG CGC CCC GCG CCC GTC CCG CCG CCC CCG CCC GCC the maximum UV-B (280-315 nm) irradiance reached TAC GGG AGG CAG CAG-3ȫ, primer 2 R518: 5ȫ-CGT ATT ACC 3.3 Wmî2 at 11:30 (local hour), UV-A (315-400 nm) irradiance GCG GCT GCT GG-3ȫ and primer 3 F357: 5ȫ-TAC TGA TAG AA was 25.6 Wmî2 and PAR (400-700 nm) was 340 Wmî2 (data no T GTG GAG C-3ȫ. shown). PCR ampliÀ cation and DGGE were performed as it was Surface water samples were collected with a clean descr ibed previously by Farias et al.9 Distinguishable bands bucket to be used for experiments. Water was pre-À ltered were excised from the gel; the eluted DNA was used as 360 M.V. Fernández-Zenoff et al Figure 1 Map showing the study area and the relative position of Laguna Azul in Catamarca province, Argentina. template for re-ampliÀ cation using primers 2 and 3 and PCR and no CPD were detected in Rhodococcus sp. A5 saline products were sequenced in Macrogen Korea. suspension exposure to natural radiation. However, Gel analysis gave a total of 15 predominant bands, 1,763±174.44 CPD Mbî1 were detected in the calf thymus deÀ ned by intensity and frequency of appearance. The DNA at the end of the experiments. 16S rRNA gene sequence of DGGE bands obtained at all The present study contributes to our knowledge of the sampling times belonged to Alpha and Beta-proteobacteria bacterial diversity of a remote and rather unexplored (Roseobacter sp. and uncultured Beta-proteobacterium), habitat and the effect of natural radiation in this microbial CFB (an uncultured Bacteroidetes), HGC (Agrococcus sp.) community. The microbial community in Laguna Azul was and LGC (Staphylococcus sp.). Minor modiÀ cations in the similar to those from other Argentinean and Chilean high- community structure were observed throughout the day. altitude wetlands where Bacteroidetes and Proteobacteria Uncultured Beta-proteobacteria (band A3), Agrococcus sp. were predominant5,7,9,12. As it was observed in Laguna (band A1) and uncultured bacteria (band A4) were present Vilama, a HAAW where similar experiments were carried at all sampling times. Bands that disappeared with out9, no signiÀ cant changes in the bacterioplankton increasing solar radiation doses were related to community composition throughout a day were detected Bacteroidetes (bands A6 and A7). Finally, a band that (Table 2). The bands recovered in Laguna Azul revealed emerged during solar exposition was related to Roseobacter sequences shared with Laguna Vilama such as Agrococcus sp. sp. (band A2) and Staphylococcus sp. (band A5) (Table 1). and Roseobacter sp. In both lakes, the uncultured The amount of CPD was determined by using the method Agrococcus band remained stable during solar exposure proposed by Boelen et al.3 employing a primary antibody while in Laguna Azul, the Roseobacter sp. band increased (H3, AfÀ tech, Oslo) directed mainly to thymine dimers. CPD its intensity during solar exposure. detection was done using ECL detection reagents With regard to the band related to Staphylococcus, an (Amersham) in combination with photosensitive À lms increase in its intensity was observed during natural solar (Amersham HyperÀ lm ECL).
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