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Guillouet S, Lemaire C, Bonmarchand G, Zimmer L, le Bars D. Large scale production of 6-[18F]fluoro-L-DOPA in a semi-automated system. J Labelled Comp Radiopharm 2012. [DOI: 10.1002/jlcr.25804401305] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Lemaire C, Gillet S, Ooi T, Kameda M, Takeuchi M, Maruoka K, Plenevaux A, Luxen A. Enantioselective synthesis of 2-[18F]fluoro-L-tyrosine by catalytic phase-transfer alkylation. J Labelled Comp Radiopharm 2012. [DOI: 10.1002/jlcr.25804401301] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Bathaei S, Vitry J, Noel C, Vambergue A, Lemaire C, Romon M. P44 Évaluation des connaissances des médecins généralistes (MG) sur la microalbuminurie (MA). DIABETES & METABOLISM 2012. [DOI: 10.1016/s1262-3636(12)71146-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Vormittag L, Lemaire C, Radonjic D, Kornek G, Selzer E. Re-irradiation combined with capecitabine in locally recurrent squamous cell carcinoma of the head and neck. A prospective phase II trial. Strahlenther Onkol 2012; 188:235-42. [PMID: 22318328 DOI: 10.1007/s00066-011-0040-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2011] [Accepted: 12/02/2011] [Indexed: 11/24/2022]
Abstract
BACKGROUND We performed a prospective phase II trial to investigate the safety and efficacy of radiotherapy combined with capecitabine in patients suffering from a recurrence of a squamous cell carcinoma of the head and neck (SCCHN) within a previously irradiated field. PATIENTS AND METHODS A total of 31 evaluable patients with recurrent SCCHN received re-irradiation with a total dose of 50 Gy (25 fractions over 5 weeks) up to a maximum of 60 Gy combined with 900 mg/m(2)/day capecitabine given on the days of radiotherapy. RESULTS The median time to relapse after the first course of radiotherapy was 15 months. The overall response rate in our study was 68% including 6 patients with a complete response. The median overall survival was 8.4 months. Grade 3 or 4 mucositis occurred in 4 patients and 1 patient, respectively. No grade 4 hematological toxicities were observed; 1 patient had grade 3 anemia. The cumulative median lifetime dose was 116 Gy. CONCLUSION Capecitabine combined with re-irradiation is a well-tolerated treatment in patients with recurrent SCCHN. In light of its good tolerability, it appears to be a potential option for patients with a reduced performance status and may also serve as a basis for novel treatment concepts, such as in combination with targeted therapies.
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Nabid A, Carrier N, Vigneault E, Souhami L, Lemaire C, Brassard M, Bahoric B, Archambault R, Vincent F, Nguyen T. Testosterone Suppression in Patients with Intermediate Risk Prostate Cancer Treated with External Beam Radiotherapy Alone. Int J Radiat Oncol Biol Phys 2011. [DOI: 10.1016/j.ijrobp.2011.06.085] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Lemaire C, Cantineau R, Christiaens L, Guillaume M. N.C.A. radiofluorination of altanserine a potential serotonine receptor-binding radiopharmaceutical for positron emission tomography. J Labelled Comp Radiopharm 2011. [DOI: 10.1002/jlcr.25802601145] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Lemaire C, Tessier M, Maréchal E. Synthesis of novel amphiphilic di-block and multiarmed star-shaped copolymers based on polyisobutylene and poly(ethylene oxide). ACTA ACUST UNITED AC 2011. [DOI: 10.1002/masy.19971220157] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Henry G, Varroud-Vial M, Monguillon P, Olocco M, Pinsard D, De Beco A, Lemaire C. 165 Annual review of type 2 diabetes--results of a national program. BMJ Qual Saf 2010. [DOI: 10.1136/qshc.2010.041608.10] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Lemaire C, Cabot F, Zhang Q, David T. 400 Association familiale d’un kératocône et d’une dystrophie postérieure polymorphe. J Fr Ophtalmol 2009. [DOI: 10.1016/s0181-5512(09)73524-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Chaput-Bardy A, Lemaire C, Picard D, Secondi J. In-stream and overland dispersal across a river network influences gene flow in a freshwater insect, Calopteryx splendens. Mol Ecol 2009; 17:3496-505. [PMID: 19160477 DOI: 10.1111/j.1365-294x.2008.03856.x] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Gene flow in riverine species is constrained by the dendritic (branching) structure of the river network. Spatial genetic structure (SGS) of freshwater insects is particularly influenced by catchment characteristics and land use in the surroundings of the river. Gene flow also depends on the life cycle of organisms. Aquatic larvae mainly drift downstream whereas flying adults can disperse actively overland and along watercourses. In-stream movements can generate isolation by distance (IBD) at a local scale and differentiation between subcatchments. However, these patterns can be disrupted by overland dispersal. We studied SGS across the Loire River in the damselfly Calopteryx splendens which is able to disperse along and between watercourses. Our sampling design allowed us to test for overland dispersal effects on genetic differentiation between watercourses. Amplified fragment length polymorphism markers revealed high genetic differentiation at the catchment scale but the genetic structure did not reflect the geographical structure of sampling sites. We observed IBD patterns when considering the distance following the watercourse but also the Euclidean distance, i.e. the shortest distance, between pairs of sites. Altogether, our results support the hypothesis of overland dispersal between watercourses. From a conservation perspective, attention should be paid to the actual pathways of gene flow across complex landscapes such as river networks.
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Bifolchi A, Picard D, Lemaire C, Cormier JP, Pagano A. Evidence of admixture between differentiated genetic pools at a regional scale in an invasive carnivore. CONSERV GENET 2009. [DOI: 10.1007/s10592-008-9780-1] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Coquart JBJ, Lemaire C, Douillard C, Garcin M. [Effects of intermittent walk program on the body mass and composition in obese women]. ANNALES D'ENDOCRINOLOGIE 2008; 69:227-30. [PMID: 18423556 DOI: 10.1016/j.ando.2008.01.006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2007] [Accepted: 01/03/2008] [Indexed: 10/22/2022]
Abstract
UNLABELLED The obese patients adhere weakly to rehabilitation programs; therefore the expected gains are often disappointing. This is possibly linked to the monotony of constant velocity exercises frequently proposed. Consequently, other less monotonous exercises such as the intermittent walk may be more appropriated. OBJECTIVES The main objectives of this study were to determine if the obese women prefer a constant velocity walk or an intermittent walk, and to analyze the effects of a rehabilitation program based on the intermittent walk. MATERIALS AND METHODS Twenty obese women were recruited. To determine the preferred walk modality, 10 obese women performed a constant velocity walk and an intermittent walk (with a similar duration and velocity) on a treadmill. The preferred walk modality was determined by lower ratings of perceived exertion. Then, these same 10 women participated in a rehabilitation program of 10 weeks (three days per week) consisting of intermittent walks. The 10 other women did not participate in a training program. RESULTS The ratings of perceived exertion were not significantly different between the two walk modalities. However, the women who participated in a training program increased their maximal distance during a 6 min walking test and they have stabilized theirs anthropometric data. Meanwhile, the untrained women have increased their body mass, body mass index and percentage of body fat. CONCLUSION The obese patients preferred similarly the constant velocity walk and the intermittent walk, and a rehabilitation program based on an intermittent walk is effective in avoiding the obesity aggravation.
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Sutter C, Lemaire C, David T. 634 Tuberculose disséminée et granulome choroïdien. J Fr Ophtalmol 2008. [DOI: 10.1016/s0181-5512(08)71233-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Deniaud A, Sharaf el dein O, Maillier E, Poncet D, Kroemer G, Lemaire C, Brenner C. Endoplasmic reticulum stress induces calcium-dependent permeability transition, mitochondrial outer membrane permeabilization and apoptosis. Oncogene 2007; 27:285-99. [PMID: 17700538 DOI: 10.1038/sj.onc.1210638] [Citation(s) in RCA: 443] [Impact Index Per Article: 26.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The accumulation of Ca2+ in the mitochondrial matrix can stimulate oxidative phosphorylation, but can also, at high Ca2+ concentrations, transmit and amplify an apoptotic signal. Here, we characterized the capacity of physiological stimuli (for example, histamine and inositol-1,4,5-triphosphate) and inducers of endoplasmic reticulum (ER) stress (for example, A23187, thapsigargin and tunicamycin) to release Ca2+ from ER stores, induce mitochondrial Ca2+ accumulation, and trigger cell death in human cervix and colon carcinoma cell lines. Sustained Ca2+ accumulation in the mitochondrial matrix induced by ER stress triggered signs of proapoptotic mitochondrial alteration, namely permeability transition, dissipation of the electrochemical potential, matrix swelling, relocalization of Bax to mitochondria and the release of cytochrome c and apoptosis-inducing factor from mitochondria. In contrast, rapid and transient accumulation of Ca2+ induced by physiological stimuli failed to promote mitochondrial permeability transition and to affect cell viability. The specificity of this apoptosis pathway was validated in cells using a panel of pharmacological agents that chelate Ca2+ (BAPTA-AM) or inhibit inositol-1,4,5-trisphosphate receptor (IP(3)R; 2-aminoethoxydiphenyl borate), voltage-dependent anion channel (VDAC) (4,4'-diisothiocyanatostilbene-2,2'-disulfonate, NADH), the permeability transition pore (cyclosporin A and bongkrekic acid), caspases (z-VAD-fmk) and protein synthesis (cycloheximide). Finally, we designed an original cell-free system in which we confronted purified mitochondria and ER vesicles, and identified IP(3)R, VDAC and the permeability transition pore as key proteins in the ER-triggered proapoptotic mitochondrial membrane permeabilization process.
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Padhy G, Lemaire C, Amirtharaj E, Ioannidis M. Pore size distribution in multiscale porous media as revealed by DDIF–NMR, mercury porosimetry and statistical image analysis. Colloids Surf A Physicochem Eng Asp 2007. [DOI: 10.1016/j.colsurfa.2006.12.039] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Fauvelot C, Lemaire C, Planes S, Bonhomme F. Inferring gene flow in coral reef fishes from different molecular markers: which loci to trust? Heredity (Edinb) 2007; 99:331-9. [PMID: 17519963 DOI: 10.1038/sj.hdy.6801005] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
Contrasting results are usually reported in the literature regarding the factors influencing observed structuring of genetic variability. The goals of this study were, for five coral reef fishes in French Polynesia, (1) to infer the theoretical variance of single locus F(ST) estimates expected under neutrality in order to exclude outlier loci before inferring gene flow and (2) to test thereafter whether species laying pelagic eggs effectively disperse more than species laying benthic eggs in this system. For this purpose, a total of 952 individuals from five species belonging to two families (Chaetodontidae and Pomacentridae) were screened among populations sampled within a 60-600 km spatial range for intron length polymorphism at 11 loci in order to illuminate contrasting results previously published on allozymes and mitochondrial DNA (mtDNA) control region polymorphisms. Statistically speaking, among the five species, four loci (three allozymes and one intron) were identified as outliers and discarded before interpretation of genetic differentiation in terms of effective dispersal. Biologically speaking, our results suggest that the observed genetic structure is not significantly related to the reproductive strategy of coral reef fish in the island system we analysed and that observed random genetic differentiation accommodates Wright's island model in all five species surveyed. Overall, our study emphasizes how cautious one has to be when trying to interpret present-day genetic structure in terms of gene flow while using a limited number of loci and/or different sets of loci.
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Cavestany D, Betancour H, Blanc JE, Lemaire C, Slavica J, Moreira F, Piaggio J, Risco C. Reproductive efficiency in grazing lactating dairy cows under a programmed reproductive management system. Aust Vet J 2007; 85:141-7. [PMID: 17397384 DOI: 10.1111/j.1751-0813.2006.00100.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
OBJECTIVE To evaluate the effectiveness of a reproductive management program consisting of combinations of Ovsynch/TAI and prostaglandin (PG) F(2alpha) treatments in Holstein dairy cows under a pasture-based dairying system. DESIGN Field trial. PROCEDURE A total of 1177 cows in 8 commercial dairy farms were randomly allocated to control and treatment groups. Treatment group cows received one of two interventions depending upon the number of days postpartum (DPP) before the planned start of breeding. Cows more than 50 DPP by the planned start of breeding received the Ovsynch/TAI treatment, consisting of gonadotrophin releasing hormone (GnRH) - PGF(2alpha)- GnRH plus timed artificial insemination. Cows between 40 and 50 DPP received a PGF(2alpha) treatment followed by oestrus detection and, if the cow was not seen in oestrus, the cow received a second PGF(2alpha) 14 days later. Control cows were submitted to twice a day heat detection followed by artificial insemination. The experimental period was the start of the breeding season plus 21 days for cows over 50 DPP at the start of breeding, and was 40-61 DPP for cows that calved later and passed their voluntary waiting period after the start of the breeding season. RESULTS Submission rate was higher for the treated group than for the control group (84.9% vs. 55.1%; P < 0.0001), as was the conception rate (51.0% vs. 46.1%; P < 0.03). Due to farm variations, pregnancy rate was similar in both groups (38.5% vs. 28.2%; P > 0.1). Within the treated group, conception rate and pregnancy rate of the cows inseminated after a PGF(2alpha) were higher than for timed artificial inseminated cows (51.4% vs. 32.6%; P < 0.001), and (37.8% vs. 32.6%; P < 0.001). CONCLUSION A programmed reproductive management protocol may improve reproductive efficiency in dairy farms with seasonal breeding, by increasing submission and conception rates at the beginning of the breeding season and/or at the end of the voluntary waiting period. Fertility of cows bred after a PGF(2alpha) synchronised heat was greater than after an Ovsynch/TAI protocol.
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Godefroy N, Lemaire C, Mignotte B, Vayssière JL. p53 and Retinoblastoma protein (pRb): A complex network of interactions. Apoptosis 2006; 11:659-61. [PMID: 16554964 DOI: 10.1007/s10495-006-5543-y] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Laïque S, Egrise D, Monclus M, Schmitz F, Garcia C, Lemaire C, Luxen A, Goldman S. L-Amino acid load to enhance PET differentiation between tumor and inflammation: anin vitro study on18F-FET uptake. CONTRAST MEDIA & MOLECULAR IMAGING 2006; 1:212-20. [PMID: 17193698 DOI: 10.1002/cmmi.107] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Labeled amino acids (AA) are tumor tracers for use in nuclear medecine. O-(2-[(18)F]fluoroethyl)-L-tyrosine (FET) is transported by the L-system, known to function as an exchanger. In vitro utilization of FET, after a preload or prior to an afterload of non radioactive L-amino acids, was evaluated in order to measure the potential effects of AA content on the distinction between tumor and inflammatory lesions. Cellular uptake of FET was studied on rat osteosarcoma cells (ROS 17/2.8) and human leukocytes, initially loaded with nonradioactive L-tyrosine or L-methionine. FET efflux was evaluated from cells loaded with nonradioactive L-phenylalanine after tracer uptake. ROS 17/2.8 showed a higher sensitivity to preload and afterload effects on cellular FET content as compared with the leukocytes. We conclude that preload with L-tyrosine, prior to the administration of FET, may be a potential procedure to improve PET differentiation between tumor and inflammatory lesions.
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Aigbirhio FI, Alexakis E, Allen J, Baron JC, Beech J, Beyer J, Bloxsidge JP, Botting NP, Brichard L, Bushby N, Cable K, Clark JC, Conway LK, Del Fiore G, Dollé F, Ellames G, Feling N, Fryatt T, Fryer TD, Gee AD, Haajanen K, Harding JR, Haswell SJ, Hickey MJ, Holt DW, Hooper J, Johnston A, Johnston G, Jones JR, Kent B, Kingston LP, Kitson SL, Knagg E, Koch B, Kuhnert N, Lang M, Lang-Fugmann S, Lawrie KWM, Lemaire C, Lewis RJ, Lockley WJS, Luxen A, Manning CO, Mather AN, Meath P, Passchier J, Perrie JA, Plenevaux A, Plisson C, Probst KC, Rees DO, Rivron L, Rustidge D, Rüth M, Schofield JM, Scott P, Sontag B, Spiteller P, Stachulski AV, Steglich W, Wadsworth AH, Watts P, Warburton L, Weissberg P, Wiles C, Wilkinson DJ, Willis CL, Fryatt T, Haajanen K, Botting NP, Dollé F, Scott P, Brichard L, Del Fiore G, Lemaire C, Plenevaux A, Luxen A, Hickey MJ, Kingston LP, Lockley WJS, Mather AN, Wilkinson DJ, Steglich W, Beyer J, Feling N, Koch B, Lang M, Lang-Fugmann S, Sontag B, Spiteller P, Rüth M, Allen J, Rivron L, Schofield JM, Kuhnert N, Watts P, Gee AD, Wadsworth AH, Harding JR, Holt DW, Johnston A, Meath P, Perrie JA, Stachulski AV, Lockley WJS, Lewis RJ, Wilkinson DJ, Jones JR, Lockley WJS, Wilkinson DJ, Jones JR, Wadsworth AH, Alexakis E, Bloxsidge JP, Jones JR, Lockley WJS, Alexakis E, Jones JR, Lockley WJS, Rees DO, Willis CL, Bushby N, Harding JR, Kitson SL, Knagg E, Conway LK, Manning CO, Lawrie KWM, Plisson C, Gee AD, Passchier J, Probst KC, Brichard L, Beech J, Fryer TD, Baron JC, Clark JC, Warburton L, Weissberg P, Aigbirhio FI, Hooper J, Watts P, Wiles C, Wiles C, Watts P, Haswell SJ. 15th International Isotope Society (UK group) Symposium. J Labelled Comp Radiopharm 2006. [DOI: 10.1002/jlcr.1056] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Ousmane ML, Herbecq P, Nyunga M, Vignozzi G, Lemaire C. [Duodenocaval fistula: an unusual form of peptic ulcer revelation]. ACTA ACUST UNITED AC 2005; 24:1294-6. [PMID: 16183244 DOI: 10.1016/j.annfar.2005.04.030] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2004] [Accepted: 04/27/2005] [Indexed: 01/06/2023]
Abstract
The duodenocaval fistula is exceptional. We report the case of a 44-year-old patient with duodenocaval fistula. The patient had no history of peptic ulcer disease. The clinical feature was firstly a septic shock and then an haemorrhagic shock. Only laparotomy confirmed the diagnosis. The treatment was a surgical one with a rapid improvement. The prognosis depends on surgical experience and remains serious.
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Lemaire C, Cochard C, Lebaillif S, Cochener B. 401 Kérato-uvéite amibienne à acanthamoeba species groupe 2 : polyphaga castellanii. À propos d’une observation. J Fr Ophtalmol 2005. [DOI: 10.1016/s0181-5512(05)73522-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Roussel B, Lejeune M, Lemaire C, Bettembourg O, Cochener B. 738 Lymphome de type MALT de la glande lacrymale. À propos d’un cas. J Fr Ophtalmol 2005. [DOI: 10.1016/s0181-5512(05)73855-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Godefroy N, Lemaire C, Renaud F, Rincheval V, Perez S, Parvu-Ferecatu I, Mignotte B, Vayssière JL. p53 can promote mitochondria- and caspase-independent apoptosis. Cell Death Differ 2005; 11:785-7. [PMID: 15002037 DOI: 10.1038/sj.cdd.4401398] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
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Lemaire C, Versini JJ, Bonhomme F. Maintenance of genetic differentiation across a transition zone in the sea: discordance between nuclear and cytoplasmic markers. J Evol Biol 2005; 18:70-80. [PMID: 15669962 DOI: 10.1111/j.1420-9101.2004.00828.x] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
To investigate the origin and maintenance of the genetic discontinuity between Atlantic and Mediterranean populations of the common sea bass (Dicentrarchus labrax) we analysed the genetic variation at a fragment of mitochondrial cytochrome b sequence for 18 population samples. The result were also compared with new or previously published microsatellite data. Seven mitochondrial haplotypes and an average nucleotidic divergence of 0.02 between Atlantic and Mediterranean populations that matches a Pleistocene allopatric isolation were found. The frequency variation at the cytochrome b locus was many times greater between Atlantic and Mediterranean populations (theta(C) = 0.67) than at microsatellite loci (theta(N)= 0.02). The examination of the different evolutionary forces at play suggests that a sex-biased hybrid breakdown is a likely explanation for part of the observed discrepancy between mitochondrial and nuclear loci. In addition, an analysis is made of the correlation between microsatellite loci points towards the possible existence of a hybrid zone in samples from the Alboran Sea.
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