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Journal of Eukaryotic Microbiology

Mónica Santín, Rafael Calero-Bernal, David Carmena, Marta Mateo, Ana Balseiro, Marta Barral, José Francisco Lima Barbero, Miguel Ángel Habela
Microsporidia comprises a diverse group of obligate intracellular parasites that infect a broad range of invertebrates and vertebrates. Among Microsporidia, Enterocytozoon bieneusi is the most frequently detected species in humans and animals worldwide bringing into question the possible role of animal reservoirs in the epidemiology of this pathogen. Although E. bieneusi is an emerging zoonotic pathogen able to infect many domestic and wild mammals that could act as reservoir of infection for humans and other animals, only few studies have documented its occurrence in wild carnivores...
December 12, 2017: Journal of Eukaryotic Microbiology
Sarah E Hamsher, Cheng Yun Tina Sung, Robert W Sanders
The influences of intensity and repeated exposure to ultraviolet-B radiation (UVB), photoreactivating repair radiation (PRR), and temperature on the scuticociliate Parauronema acutum were explored under laboratory conditions. Population growth was negatively affected after exposure to the equivalent of one sunny summer day of ambient UVB, especially in the absence of PRR. Repeated daily exposure to UVB severely compromised ciliate survival. UVB-exposed treatments without PRR recovered slower and reached lower final abundances than treatments receiving PRR...
December 6, 2017: Journal of Eukaryotic Microbiology
Harry vanKeulen, David Lloyd, Nigel Yarlett, Timothy Paget
No abstract text is available yet for this article.
December 3, 2017: Journal of Eukaryotic Microbiology
Elena N Temereva, Yuliya Y Sokolova
Microsporidia-like spores (2.0-3.0 x 1.3-1.5 μm) were discovered upon examination of histological sections taken from Phoronis embryolabi Temereva, Chichvarkhin 2017 found inhabiting burrows of shrimps Nihonotrypeae japonica (Decapoda, Callianassidae) from the Sea of Japan, Russia. Ultrastructural examination of spores revealed one nucleus and a uniform polar filament of 7-11 coils. Representatives of the phylum Phoronida have never been recorded as hosts of microsporidia. Parasites developed in vasoperitoneal tissue and caused formation of multinucleate syncytia...
November 24, 2017: Journal of Eukaryotic Microbiology
Tiantian Chen, Yun Liu, Shuqun Song, Caiwen Li
The endoparasitic dinoflagellate Amoebophrya infects a number of free-living marine dinoflagellates, including harmful algal bloom species. The parasitoid eventually kills its host and has been proposed to be a significant loss factor for dinoflagellate blooms in restricted coastal waters. For several decades, the difficulties of culturing host-parasitoid systems have been a great obstacle for further research on the biology of Amoebophrya. Here, we established an Akashiwo sanguinea-Amoebophrya sp. co-culture from Chinese coastal waters and studied the parasitoid's generation time, dinospore survival and infectivity, as well as its host specificity...
November 18, 2017: Journal of Eukaryotic Microbiology
Zifeng Zhan, Ju Li, Kuidong Xu
The thigmotrich scuticociliates Boveria labialis and Boveria subcylindrica are obligate parasites that may cause high mortality in cultured sea cucumbers and bivalves. Morphological methods can identify these organisms in active state, but are unable to discern them in resting stages. In aquaculture practice, these parasitic ciliates are hard to eradicate when massive infection occurs in sea cucumbers. Thus, early detection and precaution are crucial for the control of these pathogens. Under such circumstances, fluorescence in situ hybridization (FISH) will serve as a fast way to detect and monitor the occurrence of these parasites...
November 18, 2017: Journal of Eukaryotic Microbiology
Susan A Smith, Wen Song, Nelly A Gavrilova, Alexander V Kurilov, Weiwei Liu, George B McManus, Luciana F Santoferrara
A tintinnid ciliate isolated from waters of the Thames River (Connecticut, USA) is described through combined in vivo observation, protargol impregnation, and phylogenetic analysis. The novel genus Dartintinnus and its type species, D. alderae are distinct from established tintinnid taxa by a lorica that collapses on both anterior and posterior ends. Dartintinnus is placed in the family Eutintinnidae based on a hyaline, elongated lorica opened at both ends, a ciliary pattern including a ventral kinety, at least one dorsal kinety, and right, left and lateral fields, and a sister relationship to Eutintinnus in gene trees...
November 10, 2017: Journal of Eukaryotic Microbiology
Santosh Kumar, Daizy Bharti, Ahmed Salahuddin Kabir, Jun Seo Hong, Mann Kyoon Shin
The oxytrichid ciliate Rubrioxytricha guamensis nov. spec. isolated from water samples collected from a small freshwater pond near the Hagåtña River in Hagåtña, Guam (United States territory), Micronesia, was investigated, using live observation and protargol impregnation. The morphology, ontogenesis, and molecular phylogeny inferred from the small-subunit rRNA gene sequences were studied. The new species is mainly characterized by a cell size of about 100 × 35 μm in vivo, two elongate ellipsoidal macronuclear nodules and two micronuclei, a single contractile vacuole, a colorless cytoplasm, yellowish cortical granules, arranged in short rows and in small groups, an adoral zone occupying about 34% of body length and comprising 27 membranelles on average, about 27 cirri each in the right and left marginal rows, 18 frontoventral transverse cirri, four dorsal kineties including one dorsomarginal row, and one or two caudal cirri at the posterior end of dorsal kinety 3...
November 7, 2017: Journal of Eukaryotic Microbiology
Jéssica Cavaleiro, Noemi Mendes Fernandes, Inácio D da Silva-Neto, Carlos Augusto Gomes Soares
The morphology of Blepharisma sinuosum resting cysts and the dynamics of pigmentation at different stages of encystment are presented for the first time. Cyst morphometrics are similar to other Blepharisma species, with three wall layers, bacteria surrounding the ectocyst, a conical plug and wrinkly surface towards the plug in mature stages. The vegetative moniliform macronucleus changes to a horseshoe shape and at early stages, the cystic cytoplasm is homogeneously pigmented, comprising a contractile vacuole; later, pigments polarize towards the plug, decorate the cortical layer and become brownish...
November 6, 2017: Journal of Eukaryotic Microbiology
Huiyin Song, Qinghua Wang, Xudong Liu, Yuxin Hu, Jijian Long, Guoxiang Liu, Zhengyu Hu
The Parachlorella clade was put forward as a group within the family Chlorellaceae in 2004. Recent molecular analyses have revealed that Dictyosphaerium morphotype algae form several independent lineages within the Parachlorella clade, and new genera and species have been established. In the present study, we focus on the diversity of Dictyosphaerium morphotype algae within the Parachlorella clade, basing on 42 strains from China. We used combined analyses of morphology and molecular data based on SSU and internal transcribed spacer region (ITS) rDNA sequences to characterize these algae...
October 28, 2017: Journal of Eukaryotic Microbiology
Kevin C Wakeman, Akinori Yabuki, Katsunori Fujikura, Ko Tomikawa, Takeo Horiguchi
In an effort to broaden our understanding of the biodiversity and distribution of gregarines infecting crustaceans, this study describes two new species of gregarines, Thiriotia hyperdolphinae n. sp. and Cephaloidophora oradareae n. sp., parasitizing a deep sea amphipod (Oradarea sp.). Amphipods were collected using the ROV Hyper-Dolphin at a depth of 855 m while on a cruise in Sagami Bay, Japan. Gregarine trophozoites and gamonts were isolated from the gut of the amphipod and studied with light and scanning electron microscopy, and phylogenetic analysis of 18S rDNA...
October 17, 2017: Journal of Eukaryotic Microbiology
Daniel Méndez-Sánchez, Rosaura Mayén-Estrada, Xiaotian Luo, Xiaozhong Hu
The genus Oxytricha Bory de Saint-Vincent in Lamouroux, Bory de Saint-Vincent and Deslongchamps, 1824 comprises about 38 species distributed worldwide and has been considered to be a non-monophyletic group. Based on living observations, protargol preparations, and a small subunit ribosomal RNA (SSU rRNA) gene sequence, we describe a new subspecies Oxytricha granulifera chiapasensis n. subsp. This new taxon is morphologically characterized by undulating membranes basically in a Stylonychia-pattern, six dorsal kineties, size in vivo ca...
October 17, 2017: Journal of Eukaryotic Microbiology
Raphael Souza Pavani, Marcela O Vitarelli, Carlos A H Fernandes, Fabio F Mattioli, Mariana Morone, Milene C Menezes, Marcos R M Fontes, Maria Isabel N Cano, Maria Carolina Elias
Replication protein A (RPA), the major eukaryotic single-stranded binding protein, is a heterotrimeric complex formed by RPA-1, RPA-2 and RPA-3. RPA is a fundamental player in replication, repair, recombination and checkpoint signaling. In addition, increasing evidences have been adding functions to RPA in telomere maintenance, such as interaction with telomerase to facilitate its activity and also involvement in telomere capping in some conditions. Trypanosoma cruzi, the etiological agent of Chagas disease is a protozoa parasite that appears early in the evolution of eukaryotes...
October 16, 2017: Journal of Eukaryotic Microbiology
John D L Shadwick, Jeffery D Silberman, Frederick W Spiegel
Members of the genus Protostelium (including P. mycophaga, P. nocturnum, and P. okumukumu) are protosteloid amoebae commonly found in terrestrial habitats on dead plant matter. They, along with the closely allied nominal genus Planoprotostelium, containing the single species Pl. aurantium, all have an amoeboid trophic stage with acutely pointed subpseudopodia and orange lipid droplets in the granuloplasm. These amoebae form stalked fruiting bodies topped with a single, usually deciduous spore. The species are identified based on their fruiting body morphologies except for Pl...
October 16, 2017: Journal of Eukaryotic Microbiology
Ann E Hajek, Leellen F Solter, Joseph V Maddox, Wei-Fone Huang, Alden S Estep, Grzegorz Krawczyk, Donald C Weber, Kim A Hoelmer, Neil D Sanscrainte, James J Becnel
We describe a unique microsporidian species that infects the green stink bug, Chinavia hilaris, the brown marmorated stink bug, Halyomorpha halys, the brown stink bug, Euschistus servus, and the dusky stink bug, Euschistus tristigmus. All life stages are unikaryotic, but analysis of the consensus small subunit region of the ribosomal gene places this microsporidium in the genus Nosema, which historically has been characterized by diplokaryotic life stages. It is also characterized by having the reversed arrangement of the ribosomal gene (LSU -ITS- SSU) found in species within the "true Nosema" clade...
October 6, 2017: Journal of Eukaryotic Microbiology
Kenneth Dumack, Michael Bonkowski, Steffen Clauß, Eckhard Völcker
The genus Diaphoropodon, Archer 1869, comprises filose amoebae with agglutinated tests made of quartz grains, diatom frustules, and other particulate materials. The key trait of the genus is a hyaline theca covered with numerous 5-10 μm long, hair-like rods. Based on SSU rDNA phylogeny, we show that Diaphoropodon groups closely to Lecythium, a testate amoeba genus with a flexible but naked theca. Electron microscopic images reveal that the rods of Diaphoropodon are not perforating the test but lie randomly distributed on the surface of the amoeba...
October 6, 2017: Journal of Eukaryotic Microbiology
Yuri S Tokarev, Yuliya Y Sokolova, Aleksandra A Vasilieva, Irma V Issi
Five out of one hundred adults of Niphargogammarus intermedius caught at the Azov sea shore were found to be infected with microsporidia. The infection was found in the subcuticular fat body and myocytes. Parasites developed in direct contact with host cells, displayed a disporoblastic sporogony and diplokaryotic arrangement of nuclei at all stages. Spores were oval, 4.6-5.8x2.6-3.0 μm. Exospore appendages, vesicular-tubular secretions and the anisofilar polar filament indicated a similarity to Anncaliia species...
September 18, 2017: Journal of Eukaryotic Microbiology
(no author information available yet)
No abstract text is available yet for this article.
November 2017: Journal of Eukaryotic Microbiology
(no author information available yet)
No abstract text is available yet for this article.
November 2017: Journal of Eukaryotic Microbiology
Roberto Docampo
No abstract text is available yet for this article.
November 2017: Journal of Eukaryotic Microbiology
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