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Pinacho-Pinacho CD, Calixto-Rojas M, García-Vásquez A, Guzmán-Valdivieso I, Barrios-Gutiérrez JJ, Rubio-Godoy M. Species delimitation of Gyrodactylus (Monogenea: Gyrodactylidae) infecting the southernmost cyprinids (Actinopterygii: Cyprinidae) in the New World. Parasitol Res 2021; 120:831-848. [PMID: 33409628 DOI: 10.1007/s00436-020-06987-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2020] [Accepted: 11/24/2020] [Indexed: 10/22/2022]
Abstract
The genus Gyrodactylus von Nordmann, 1832 represents one of the most diverse and widespread taxa within Monogenea, with approximately 500 species described worldwide. Thirty-three species of Gyrodactylus have been recorded in Mexico, and in the last two decades, at least 26 new species have been described mainly from freshwater fish families such as poeciliids, goodeids, profundulids, characids, and cichlids. In this study, we describe two new species of Gyrodactylus infecting freshwater cyprinids based on morphological and molecular characteristics. Gyrodactylus ticuchi n. sp. and Gyrodactylus tobala n. sp. were recovered from Notropis moralesi de Buen and N. imeldae Cortés, respectively, captured in five localities from the State of Oaxaca, Mexico. The new species differ slightly from their congeners in the morphology of the haptoral hard parts and the male copulatory organ. Sequences of the Internal Transcribed Spacers rDNA (ITS1-5.8S-ITS2), cytochrome oxidase subunit I (cox1), and the D2 + D3 domains of the large subunit (28S rDNA) were obtained from multiple specimens and analyzed using Maximum Likelihood (ML) and Bayesian Inference (BI). Phylogenetic hypotheses using ITS rDNA, cox1, and 28S rDNA genes recovered two new species of Gyrodactylus from N. moralesi and N. imeldae; we briefly discuss their phylogenetic relationship with other congeners. These gyrodactylids represent the first species described in species of Notropis from southern Mexico, the cyprinids exhibiting the southernmost distribution in the New World.
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Affiliation(s)
- Carlos Daniel Pinacho-Pinacho
- Cátedras CONACyT, Instituto de Ecología, A. C, Red de Estudios Moleculares Avanzados, Carretera antigua a Coatepec 351, El Haya, Xalapa, 91070, Veracruz, Mexico.
| | - Miguel Calixto-Rojas
- Instituto de Ecología, A.C., Red de Biología Evolutiva, Km 2.5 Ant. Carretera a Coatepec, 91070 Xalapa, Veracruz, Mexico
| | - Adriana García-Vásquez
- Instituto de Ecología, A.C., Red de Biología Evolutiva, Km 2.5 Ant. Carretera a Coatepec, 91070 Xalapa, Veracruz, Mexico
| | - Ismael Guzmán-Valdivieso
- Instituto de Ecología, A.C., Red de Biología Evolutiva, Km 2.5 Ant. Carretera a Coatepec, 91070 Xalapa, Veracruz, Mexico
| | - Juan J Barrios-Gutiérrez
- Instituto de Ecología, A.C., Red de Biología Evolutiva, Km 2.5 Ant. Carretera a Coatepec, 91070 Xalapa, Veracruz, Mexico
| | - Miguel Rubio-Godoy
- Instituto de Ecología, A.C., Red de Biología Evolutiva, Km 2.5 Ant. Carretera a Coatepec, 91070 Xalapa, Veracruz, Mexico
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da Silva BAF, Dias KGA, da Silva RJ, Yamada FH. A new species of Wallinia Pearse, 1920 (Digenea: Allocreadiidae), in Astyanax bimaculatus (Linnaeus, 1758) (Characidae) in Northeast Brazil, based on morphology and DNA sequences. Parasitol Res 2020; 120:37-44. [PMID: 33241440 DOI: 10.1007/s00436-020-06948-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2020] [Accepted: 10/27/2020] [Indexed: 11/25/2022]
Abstract
Wallinia caririensis n. sp. is described from the intestine of Astyanax bimaculatus (Linnaeus, 1758) (Characidae) collected in the Batateiras River in the municipality of Crato, Ceará state, Brazil. The description was based on integrative taxonomy approach using DNA sequences from the D1-D3 domains of the 28S rDNA gene. The new species was confirmed through the phylogenetic analysis of the 28S rDNA gene, which showed that Wallinia caririensis n. sp. is a sister taxon of Wallinia brasiliensis (Dias, Müller, Almeida, Silva, Azevedo, Pérez-Ponce de León, and Abdallah, 2018, and Wallinia anindoi Hernández-Mena, Pinacho-Pinacho, García-Varela, Mendonza-Garfias, and Pérez-Ponce de León, 2019), a species which parasitizes Astyanax fasciatus (Cuvier, 1819), A. lacustris (Lucena and Soares, 2016) in Brazil, and A. aeneus (Günther, 1860) in Mexico, with genetic divergences of 2% and 3%, respectively. The new species can be distinguished morphologically from its congeners by possessing large body size (length and width) and tapered extremity in the posterior end of the body, eyespots are present at the pharynx level, and vitelline follicles reach up to the half distance between the posterior testis and the extremity of the body, by having larger testes distributed in coincident zones (i.e., contiguous) and non-operculated eggs (a conspicuous characteristic in W. brasiliensis). To date, species of this genus have already been described in freshwater fishes from Mexico, Costa Rica, Venezuela, and Southeastern Brazil. The species described in this study consists of the second species parasitizing characids in Brazil, and the first record in Northeastern Brazil. This finding fills a gap and expands the biogeographic distribution of the genus Wallinia in South America.
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Affiliation(s)
- Bruno Anderson Fernandes da Silva
- Laboratório de Ecologia Parasitária (LABEP), Departamento de Biologia, Universidade Regional do Cariri (URCA) - Campus Pimenta, Pimenta, Crato, Ceará, 63105-000, Brazil.
| | - Karina Gabriele Alves Dias
- Laboratório de Parasitologia de Animais Silvestres (LAPAS), Setor de Parasitologia, Instituto de Biociências de Botucatu, Universidade Estadual Paulista "Júlio de Mesquita Filho" (UNESP), Campus Botucatu, Botucatu, São Paulo, Brazil
| | - Reinaldo José da Silva
- Laboratório de Parasitologia de Animais Silvestres (LAPAS), Setor de Parasitologia, Instituto de Biociências de Botucatu, Universidade Estadual Paulista "Júlio de Mesquita Filho" (UNESP), Campus Botucatu, Botucatu, São Paulo, Brazil
| | - Fábio Hideki Yamada
- Laboratório de Ecologia Parasitária (LABEP), Departamento de Biologia, Universidade Regional do Cariri (URCA) - Campus Pimenta, Pimenta, Crato, Ceará, 63105-000, Brazil
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Vidal LP, McIntosh D, Luque JL. Morphological and phylogenetic characterization of a novel Unicauda species, infecting the kidney of Astyanax altiparanae (Teleostei: Characidae) in Brazil. Acta Parasitol 2018; 63:495-503. [PMID: 29975658 DOI: 10.1515/ap-2018-0059] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2018] [Accepted: 04/10/2018] [Indexed: 11/15/2022]
Abstract
During a parasitological survey of Astyanax altiparanae captured in the Mogi Guaçú river, Pirassununga, state of São Paulo, Brazil, a new species of myxozoa was observed infecting the kidney of 30 of 42 specimens. Plasmodia of the new myxozoa, referred to herein as Unicauda whippsi n. sp. were spherical and varied from 450 to 1000 μm in length. The mature spore was elongated and measured 11 ± 1.2 (10-12) μm long by 5.4 ± 0.6 (4.7-7.2) μm wide. Polar capsules of unequal length with the filament coiled 7-9 times and a unique caudal process characteristic of the genus Unicauda, were recorded. Phylogenetic analysis demonstrated that U. whippsi n. sp. clustered with members of the genus Unicauda and Myxobolus, confirming it's placement within the family Myxobolidae. This is the first record of a species of Unicauda infecting characiform fish, as well as the first registered occurrence of species of this genus in South America.
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Affiliation(s)
- Letícia P Vidal
- Departamento de Parasitologia Animal, Universidade Federal Rural do Rio de Janeiro, Caixa postal 74.540, CEP 23851-970, Seropédica, Rio de Janeiro, Brazil
| | - Douglas McIntosh
- Departamento de Parasitologia Animal, Universidade Federal Rural do Rio de Janeiro, Caixa postal 74.540, CEP 23851-970, Seropédica, Rio de Janeiro, Brazil
| | - José L Luque
- Departamento de Parasitologia Animal, Universidade Federal Rural do Rio de Janeiro, Caixa postal 74.540, CEP 23851-970, Seropédica, Rio de Janeiro, Brazil
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Zago AC, Franceschini L, Müller MI, Silva RJD. A new species of Cacatuocotyle (Monogenea, Dactylogyridae) parasitizing Astyanax spp. (Characiformes, Characidae) from Brazil, including molecular data and a key to species identification. Acta Parasitol 2018; 63:261-269. [PMID: 29654691 DOI: 10.1515/ap-2018-0030] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2017] [Accepted: 01/15/2018] [Indexed: 11/15/2022]
Abstract
The present study describes Cacatuocotyle papilionis n. sp. (Monogenea, Dactylogyridae) from the skin of the characid fishes Astyanax lacustris (Lütken, 1875) (=Astyanax altiparanae Garutti & Britski, 2000) and Astyanax fasciatus (Cuvier, 1819) (Characiformes, Characidae) from the Southeast of Brazil, supported by morphological and molecular data. The new species differs from all congeners, mainly due to the morphology of the ventral bar (resembling a butterfly), accessory piece, and the number of rings of the male copulatory organ (MCO), comprising a coiled tube with 4.5-5.5 counterclockwise rings. The first molecular data for this monogenean genus is provided in this study, using the partial sequences of the ribosomal gene (28S), as well as providing an identification key to the species.
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Affiliation(s)
- Aline Cristina Zago
- São Paulo State University (Unesp), Institute of Biosciences, Botucatu, Brazil, CEP 18618-689
| | - Lidiane Franceschini
- São Paulo State University (Unesp), Institute of Biosciences, Botucatu, Brazil, CEP 18618-689
| | - Maria Isabel Müller
- São Paulo State University (Unesp), Institute of Biosciences, Botucatu, Brazil, CEP 18618-689
| | - Reinaldo José da Silva
- São Paulo State University (Unesp), Institute of Biosciences, Botucatu, Brazil, CEP 18618-689
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Pomaranski EK, Reichley SR, Yanong R, Shelley J, Pouder DB, Wolf JC, Kenelty KV, Van Bonn B, Oliaro F, Byrne B, Clothier KA, Griffin MJ, Camus AC, Soto E. Characterization of spaC-type Erysipelothrix sp. isolates causing systemic disease in ornamental fish. J Fish Dis 2018; 41:49-60. [PMID: 28708262 DOI: 10.1111/jfd.12673] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2017] [Revised: 05/17/2017] [Accepted: 05/24/2017] [Indexed: 06/07/2023]
Abstract
Since 2012, low-to-moderate mortality associated with an Erysipelothrix sp. bacterium has been reported in ornamental fish. Histological findings have included facial cellulitis, necrotizing dermatitis and myositis, and disseminated coelomitis with abundant intralesional Gram-positive bacterial colonies. Sixteen Erysipelothrix sp. isolates identified phenotypically as E. rhusiopathiae were recovered from diseased cyprinid and characid fish. Similar clinical and histological changes were also observed in zebrafish, Danio rerio, challenged by intracoelomic injection. The Erysipelothrix sp. isolates from ornamental fish were compared phenotypically and genetically to E. rhusiopathiae and E. tonsillarum isolates recovered from aquatic and terrestrial animals from multiple facilities. Results demonstrated that isolates from diseased fish were largely clonal and divergent from E. rhusiopathiae and E. tonsillarum isolates from normal fish skin, marine mammals and terrestrial animals. All ornamental fish isolates were PCR positive for spaC, with marked genetic divergence (<92% similarity at gyrB, <60% similarity by rep-PCR) between the ornamental fish isolates and other Erysipelothrix spp. isolates. This study supports previous work citing the genetic variability of Erysipelothrix spp. spa types and suggests isolates from diseased ornamental fish may represent a genetically distinct species.
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Affiliation(s)
- E K Pomaranski
- Department of Medicine and Epidemiology, School of Veterinary Medicine, University of California, Davis, Davis, CA, USA
| | - S R Reichley
- College of Veterinary Medicine, Mississippi State University, Stoneville, MS, USA
| | - R Yanong
- Tropical Aquaculture Laboratory, Fisheries and Aquatic Sciences, School of Forest Resources and Conservation, IFAS/University of Florida, Ruskin, FL, USA
| | - J Shelley
- 5D Tropical Inc., Plant City, FL, USA
| | - D B Pouder
- Tropical Aquaculture Laboratory, Fisheries and Aquatic Sciences, School of Forest Resources and Conservation, IFAS/University of Florida, Ruskin, FL, USA
| | - J C Wolf
- Experimental Pathology Laboratories, Inc., Sterling, VA, USA
| | - K V Kenelty
- Department of Medicine and Epidemiology, School of Veterinary Medicine, University of California, Davis, Davis, CA, USA
| | - B Van Bonn
- A. Watson Armour III Center for Animal Health and Welfare, Shedd Aquarium, Chicago, IL, USA
| | - F Oliaro
- A. Watson Armour III Center for Animal Health and Welfare, Shedd Aquarium, Chicago, IL, USA
| | - B Byrne
- Departments of Pathology, Microbiology, and Immunology, School of Veterinary Medicine, University of California, Davis, Davis, CA, USA
| | - K A Clothier
- Departments of Pathology, Microbiology, and Immunology, School of Veterinary Medicine, University of California, Davis, Davis, CA, USA
- California Animal Health & Food Safety Lab System, School of Veterinary Medicine, University of California, Davis, Davis, CA, USA
| | - M J Griffin
- College of Veterinary Medicine, Mississippi State University, Stoneville, MS, USA
| | - A C Camus
- College of Veterinary Medicine, University of Georgia Athens, Athens, GA, USA
| | - E Soto
- Department of Medicine and Epidemiology, School of Veterinary Medicine, University of California, Davis, Davis, CA, USA
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Müller MI, Ceccarelli PS, Ueta MT. Supplementary studies on Anacanthorus penilabiatus and Mymarothecium viatorum (Monogenea: Dactylogyridae) from Piaractus mesopotamicus (Characiformes: Serrasalmidae) in Brazil. Acta Parasitol 2016; 61:508-15. [PMID: 27447213 DOI: 10.1515/ap-2016-0067] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2015] [Accepted: 03/07/2016] [Indexed: 11/15/2022]
Abstract
The dactylogyrid monogeneans Anacanthorus penilabiatus (Boeger, Husak and Martins, 1995) and Mymarothecium viatorum(Boeger, Piasecki and Sobecka, 2002), commonly found in large quantities in farmed Piaractus mesopotamicus (Holmberg, 1887) in Brazil, were collected from three fish farms located in the State of São Paulo, Brazil. Morphological and molecular identification, scanning electron microscopy, histopathological and descriptive parameters data were performed. A total of 278 specimens of P. mesopotamicus were gathered from February 2008 and July 2010. Prevalence (P) and mean intensity of infection (MII) data was taken at each location. The data showed prevalence and mean intensity of infection annually, with numbers such as P = 91.2% and MII = 50 worms/fish (Pirassununga), P = 60% and MII = 39.2 worms/fish (Mogi Mirim), and P = 100% and MII = 204.8 worms/fish (Itapira). Histopathological results showed hyperplasia of the secondary lamellae, and hypersecretion of mucus was also observed. A phylogenetic topology was inferred using complete SSU (18S) ribosomal rDNA, positioning Anacanthorus penilabiatus and Mymarothecium viatorum among other monopisthocotyleans available in GenBank.
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Chaudhary A, Verma C, Singh HS. First report on the molecular characterization of Diaphorocleidus armillatus Jogunoori et al. 2004 (Monogenea: Dactylogyridae) infecting the gills of introduced fish, Gymnocorymbus ternetzi in India. Acta Parasitol 2016; 61:639-44. [PMID: 27447232 DOI: 10.1515/ap-2016-0086] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2015] [Accepted: 03/10/2016] [Indexed: 11/15/2022]
Abstract
During an investigation of the diversity of monogenean parasites in Meerut, U.P., India, the exotic freshwater fish Gymnocorymbus ternetzi was found infected with the gill dactylogyrid species of Diaphorocleidus Jogunoori et al. 2004. Using morphological study, the present monogeneans were found similar in morphology of anchors, bars and male copulatory organ with D. armillatus Jogunoori et al. 2004. This is the first genetic characterization of D. armillatus based on the analysis of 18S ribosomal RNA sequence (1800 bp) and associated with morphological redescription. Our study suggests that more molecular investigation is required on Diaphorocleidus species for deducing correct phylogenetic position of D. armillatus.
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Corrêa LL, Tavares-Dias M, Ceccarelli PS, Adriano EA. Hematological alterations in Astyanax altiparanae (Characidade) caused by Lernaea cyprinacea (Copepoda: Lernaeidae). Dis Aquat Organ 2016; 120:77-81. [PMID: 27304872 DOI: 10.3354/dao03008] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
This study describes the hematological alterations in Astyanax altiparanae associated with infestation with Lernaea cyprinacea. The study was carried out in a lagoon of the Mogi-Guaçu River, in the municipality of Pirassununga, in the state of São Paulo, Brazil. Of 46 fish examined, 45.6% had their integument infested by L. cyprinacea, with a mean intensity of 4.9 parasites per fish and a mean abundance of 2.2, giving a total of 139 recovered crustaceans. The abundance of L. cyprinacea correlated positively with the length and weight of the hosts, and the intensity of infestation was higher in female hosts. Macroscopic observation of lesions associated with the parasite showed a severe inflammatory reaction around the site of attachment of L. cyprinacea, associated with a lower relative condition factor and blood parameters. The hematocrit, number of red blood cells and thrombocytes were higher in non-parasitized than in parasitized fish. However, the hemoglobin concentration, hematimetric indices and the number of white blood cells were not influenced by infestation.
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Affiliation(s)
- Lincoln L Corrêa
- Universidade Federal do Oeste do Pará (UFOPA), Instituto de Ciências e Tecnologia das Águas (ICTA), Avenida Mendonça Furtado n° 2946, Santarém, PA, Brazil
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Quintana MG, Ostrowski de Núñez M. The life cycle of Neocladocystis intestinalis (Vaz, 1932) (Digenea: Cryptogonimidae), in Aylacostoma chloroticum (Prosobranchia: Thiaridae), and Salminus brasiliensis (Characiformes: Characidae), in Argentina. Parasitol Res 2016; 115:2589-95. [PMID: 26984207 DOI: 10.1007/s00436-016-5004-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2016] [Accepted: 03/10/2016] [Indexed: 11/27/2022]
Abstract
The life cycle of Neocladocystis intestinalis (Vaz, 1932) was resolved experimentally. The prosobranchiate snail Aylacostoma chloroticum Hylton Scott (Thiaridae) collected in the Yacyretá Dam, Province of Misiones, Argentina, was found naturally infected with cercariae that possessed pigmented eye spots, 7 pairs of penetration glands, 12 pairs of flame cells, and a V-shaped, or Y-shaped excretory vesicle with very short stem. The cercariae developed in oval cysts, which were found on fin rays, and under scales of naturally and experimentally exposed tetragonopterid fish species and of experimentally exposed poecilid and prochilodont fish species. Adults were obtained experimentally from juvenile Salminus brasiliensis (Characidae), bred in captivity, and infected with metacercariae from albino Gymnocorymbus ternetzi (Tetragonopteridae), which had been exposed to emerging cercariae.
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Affiliation(s)
- Manuel G Quintana
- Museo Argentino de Ciencias Naturales "Bernardino Rivadavia", Av. Angel Gallardo 470, C1405 DJR, Buenos Aires, Argentina
| | - Margarita Ostrowski de Núñez
- Departamento de Biodiversidad y Biología Experimental, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón II, 1428, Buenos Aires, Argentina.
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Utsunomia R, Silva DMZDA, Ruiz-Ruano FJ, Araya-Jaime C, Pansonato-Alves JC, Scacchetti PC, Hashimoto DT, Oliveira C, Trifonov VA, Porto-Foresti F, Camacho JPM, Foresti F. Uncovering the Ancestry of B Chromosomes in Moenkhausia sanctaefilomenae (Teleostei, Characidae). PLoS One 2016; 11:e0150573. [PMID: 26934481 PMCID: PMC4775049 DOI: 10.1371/journal.pone.0150573] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2015] [Accepted: 02/17/2016] [Indexed: 11/19/2022] Open
Abstract
B chromosomes constitute a heterogeneous mixture of genomic parasites that are sometimes derived intraspecifically from the standard genome of the host species, but result from interspecific hybridization in other cases. The mode of origin determines the DNA content, with the B chromosomes showing high similarity with the A genome in the first case, but presenting higher similarity with a different species in the second. The characid fish Moenkhausia sanctaefilomenae harbours highly invasive B chromosomes, which are present in all populations analyzed to date in the Parana and Tietê rivers. To investigate the origin of these B chromosomes, we analyzed two natural populations: one carrying B chromosomes and the other lacking them, using a combination of molecular cytogenetic techniques, nucleotide sequence analysis and high-throughput sequencing (Illumina HiSeq2000). Our results showed that i) B chromosomes have not yet reached the Paranapanema River basin; ii) B chromosomes are mitotically unstable; iii) there are two types of B chromosomes, the most frequent of which is lightly C-banded (similar to euchromatin in A chromosomes) (B1), while the other is darkly C-banded (heterochromatin-like) (B2); iv) the two B types contain the same tandem repeat DNA sequences (18S ribosomal DNA, H3 histone genes, MS3 and MS7 satellite DNA), with a higher content of 18S rDNA in the heterochromatic variant; v) all of these repetitive DNAs are present together only in the paracentromeric region of autosome pair no. 6, suggesting that the B chromosomes are derived from this A chromosome; vi) the two B chromosome variants show MS3 sequences that are highly divergent from each other and from the 0B genome, although the B2-derived sequences exhibit higher similarity with the 0B genome (this suggests an independent origin of the two B variants, with the less frequent, B2 type presumably being younger); and vii) the dN/dS ratio for the H3.2 histone gene is almost 4–6 times higher for B chromosomes than for A chromosome sequences, suggesting that purifying selection is relaxed for the DNA sequences located on the B chromosomes, presumably because they are mostly inactive.
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Affiliation(s)
- Ricardo Utsunomia
- Departamento de Morfologia, Instituto de Biociências de Botucatu, Universidade Estadual Paulista, Botucatu, São Paulo, Brazil
- * E-mail:
| | | | | | - Cristian Araya-Jaime
- Departamento de Morfologia, Instituto de Biociências de Botucatu, Universidade Estadual Paulista, Botucatu, São Paulo, Brazil
| | - José Carlos Pansonato-Alves
- Departamento de Morfologia, Instituto de Biociências de Botucatu, Universidade Estadual Paulista, Botucatu, São Paulo, Brazil
| | - Priscilla Cardim Scacchetti
- Departamento de Morfologia, Instituto de Biociências de Botucatu, Universidade Estadual Paulista, Botucatu, São Paulo, Brazil
| | | | - Claudio Oliveira
- Departamento de Morfologia, Instituto de Biociências de Botucatu, Universidade Estadual Paulista, Botucatu, São Paulo, Brazil
| | | | - Fábio Porto-Foresti
- Departamento de Ciências Biológicas, Faculdade de Ciências, Universidade Estadual Paulista, Bauru, São Paulo, Brazil
| | | | - Fausto Foresti
- Departamento de Morfologia, Instituto de Biociências de Botucatu, Universidade Estadual Paulista, Botucatu, São Paulo, Brazil
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Langenmayer MC, Lewisch E, Gotesman M, Hoedt W, Schneider M, El-Matbouli M, Hermanns W. Cutaneous infection with Dermocystidium salmonis in cardinal tetra, Paracheirodon axelrodi (Schultz, 1956). J Fish Dis 2015; 38:503-506. [PMID: 24953765 DOI: 10.1111/jfd.12281] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2014] [Revised: 05/21/2014] [Accepted: 05/21/2014] [Indexed: 06/03/2023]
Affiliation(s)
- M C Langenmayer
- Institute of Veterinary Pathology at the Centre for Clinical Veterinary Medicine, LMU Munich, Munich, Germany
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