European journal of protistology最新文献_第6页

Contractile vacuoles: a rapidly expanding (and occasionally diminishing?) understanding 收缩空泡：迅速扩大（偶尔缩小？

IF 2.9 2区生物学

European journal of protistology Pub Date : 2024-03-26 DOI: 10.1016/j.ejop.2024.126078

Kiran J. More , Harpreet Kaur , Alastair G.B. Simpson , Frederick W. Spiegel , Joel B. Dacks

引用次数: 0

Homo- and hetero-oligomeric protein–protein associations explain autocrine and heterologous pheromone-cell interactions in Euplotes 同源和异源异构体蛋白-蛋白关联解释了幼虫的自分泌和异源信息素-细胞相互作用

IF 2.9 2区生物学

European journal of protistology Pub Date : 2024-03-16 DOI: 10.1016/j.ejop.2024.126075

Claudio Alimenti , Bill Pedrini , Pierangelo Luporini , Yaohan Jiang , Adriana Vallesi

{"title":"Homo- and hetero-oligomeric protein–protein associations explain autocrine and heterologous pheromone-cell interactions in Euplotes","authors":"Claudio Alimenti , Bill Pedrini , Pierangelo Luporini , Yaohan Jiang , Adriana Vallesi","doi":"10.1016/j.ejop.2024.126075","DOIUrl":"10.1016/j.ejop.2024.126075","url":null,"abstract":"<div>In Euplotes, protein pheromones regulate cell reproduction and mating by binding cells in autocrine or heterologous fashion, respectively. Pheromone binding sites (receptors) are identified with membrane-bound pheromone isoforms determined by the same genes specifying the soluble forms, establishing a structural equivalence in each cell type between the two twin proteins. Based on this equivalence, autocrine and heterologous pheromone/receptor interactions were investigated analyzing how native molecules of pheromones Er-1 and Er-13, distinctive of mating compatible E. raikovi cell types, associate into crystals. Er-1 and Er-13 crystals are equally formed by molecules that associate cooperatively into oligomeric chains rigorously taking a mutually opposite orientation, and each burying two interfaces. A minor interface is pheromone-specific, while a major one is common in Er-1 and Er-13 crystals. A close structural inspection of this interface suggests that it may be used by Er-1 and Er-13 to associate into heterodimers, yet inapt to further associate into higher complexes. Pheromone-molecule homo-oligomerization into chains accounts for clustering and internalization of autocrine pheromone/receptor complexes in growing cells, while the heterodimer unsuitability to oligomerize may explain why heterologous pheromone/receptor complexes fail clustering and internalization. Remaining on the cell surface, they are credited with a key role in cell–cell mating adhesion.</div>","PeriodicalId":12042,"journal":{"name":"European journal of protistology","volume":"94 ","pages":"Article 126075"},"PeriodicalIF":2.9,"publicationDate":"2024-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0932473924000257/pdfft?md5=82e08cb8220c05d2e4f00c51e6326a24&pid=1-s2.0-S0932473924000257-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140181978","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Parallel functional reduction in the mitochondria of apicomplexan parasites 螺旋体寄生虫线粒体的平行功能降低

IF 2.9 2区生物学

European journal of protistology Pub Date : 2024-03-09 DOI: 10.1016/j.ejop.2024.126065

Patrick J. Keeling , Mahara Mtawali , Morelia Trznadel , Samuel J. Livingston , Kevin C. Wakeman

{"title":"Parallel functional reduction in the mitochondria of apicomplexan parasites","authors":"Patrick J. Keeling , Mahara Mtawali , Morelia Trznadel , Samuel J. Livingston , Kevin C. Wakeman","doi":"10.1016/j.ejop.2024.126065","DOIUrl":"10.1016/j.ejop.2024.126065","url":null,"abstract":"<div>Extreme functional reduction of mitochondria has taken place in parallel in many distantly related lineages of eukaryotes, leading to a number of recurring metabolic states with variously lost electron transport chain (ETC) complexes, loss of the tricarboxylic acid (TCA) cycle, and/or loss of the mitochondrial genome. The resulting mitochondria-related organelles (MROs) are generally structurally reduced and in the most extreme cases barely recognizable features of the cell with no role in energy metabolism whatsoever (e.g., mitosomes, which generally only make iron-sulfur clusters). Recently, a wide diversity of MROs were discovered to be hiding in plain sight: in gregarine apicomplexans. This diverse group of invertebrate parasites has been known and observed for centuries, but until recent applications of culture-free genomics, their mitochondria were unremarkable. The genomics, however, showed that mitochondrial function has reduced in parallel in multiple gregarine lineages to several different endpoints, including the most reduced mitosomes. Here we review this remarkable case of parallel evolution of MROs, and some of the interesting questions this work raises.</div>","PeriodicalId":12042,"journal":{"name":"European journal of protistology","volume":"94 ","pages":"Article 126065"},"PeriodicalIF":2.9,"publicationDate":"2024-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0932473924000154/pdfft?md5=2fa0d50d9ef35d502b12047cc59ed12b&pid=1-s2.0-S0932473924000154-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140129340","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Minimal zoonotic risk of cryptosporidiosis and giardiasis from frogs and reptiles 蛙类和爬行动物隐孢子虫病和贾第虫病的人畜共患风险极低

IF 2.9 2区生物学

European journal of protistology Pub Date : 2024-02-28 DOI: 10.1016/j.ejop.2024.126066

Siobhon Egan , Amanda D. Barbosa , Yaoyu Feng , Lihua Xiao , Una Ryan

{"title":"Minimal zoonotic risk of cryptosporidiosis and giardiasis from frogs and reptiles","authors":"Siobhon Egan , Amanda D. Barbosa , Yaoyu Feng , Lihua Xiao , Una Ryan","doi":"10.1016/j.ejop.2024.126066","DOIUrl":"https://doi.org/10.1016/j.ejop.2024.126066","url":null,"abstract":"<div>The zoonotic potential of the protist parasites Cryptosporidium spp. and Giardia duodenalis in amphibians and reptiles raises public health concerns due to their growing popularity as pets. This review examines the prevalence and diversity of these parasites in wild and captive amphibians and reptiles to better understand the zoonotic risk. Research on Giardia in both groups is limited, and zoonotic forms of Cryptosporidium or Giardia have not been reported in amphibians. Host-adapted Cryptosporidium species dominate in reptiles, albeit some reptiles have been found to carry zoonotic (C. hominis and C. parvum) and rodent-associated (C. tyzzeri, C. muris and C. andersoni) species, primarily through mechanical carriage. Similarly, the limited reports of Giardia duodenalis (assemblages A, B and E) in reptiles may also be due to mechanical carriage. Thus, the available evidence indicates minimal zoonotic risk associated with these organisms in wild and captive frogs and reptiles. The exact transmission routes for these infections within reptile populations remain poorly understood, particularly regarding the importance of mechanical carriage. Although the risk appears minimal, continued research and surveillance efforts are necessary to gain a more comprehensive understanding of the transmission dynamics and ultimately improve our ability to safeguard human and animal health.</div>","PeriodicalId":12042,"journal":{"name":"European journal of protistology","volume":"93 ","pages":"Article 126066"},"PeriodicalIF":2.9,"publicationDate":"2024-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0932473924000166/pdfft?md5=f2d522799f5a06cf61e0671be64349cf&pid=1-s2.0-S0932473924000166-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140031379","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Redescription and molecular phylogeny of Trochilia sigmoides Dujardin, 1841 (Ciliophora, Cyrtophoria) collected from South Korea 从韩国采集的 Trochilia sigmoides Dujardin, 1841（纤毛虫，Cyrtophoria）的重新描述和分子系统发育

IF 2.9 2区生物学

European journal of protistology Pub Date : 2024-02-28 DOI: 10.1016/j.ejop.2024.126067

Ji Hye Choi , Atef Omar , Jae-Ho Jung

{"title":"Redescription and molecular phylogeny of Trochilia sigmoides Dujardin, 1841 (Ciliophora, Cyrtophoria) collected from South Korea","authors":"Ji Hye Choi , Atef Omar , Jae-Ho Jung","doi":"10.1016/j.ejop.2024.126067","DOIUrl":"https://doi.org/10.1016/j.ejop.2024.126067","url":null,"abstract":"<div>During a survey of Korean marine ciliates, Trochilia sigmoides, the type species of the genus Trochilia, was collected and examined using in vivo observation and protargol impregnation. Moreover, scanning electron microscopy and 18S rRNA gene sequencing have been applied for the first time to study this species. Morphologically, T. sigmoides is characterized by the small body size, the oval body outline, and the spiral dorsal ridges. The Korean population of T. sigmoides shows only minute differences to other populations reported in the literature, mainly in body size and the number of dorsal ridges. Phylogenetic analyses based on 18S rRNA gene sequences show that T. sigmoides and T. petrani are placed together with two members of the family Kyaroikeidae, causing the family Dysteriidae to be non-monophyletic. The present new data increase the knowledge about the morphology and phylogeny of the genus Trochilia and would assist in understanding the phylogenetic relationship between the free-living Dysteriidae and the parasitic Kyaroikeidae.</div>","PeriodicalId":12042,"journal":{"name":"European journal of protistology","volume":"93 ","pages":"Article 126067"},"PeriodicalIF":2.9,"publicationDate":"2024-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140042490","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A new centrohelid heliozoan, Pterocystis polycristalepis sp. nov., and taxonomic and phylogenetic concerns within Pterista (Haptista: Centroplasthelida) 一种新的中心螺旋体 Pterocystis polycristalepis sp.

IF 2.9 2区生物学

European journal of protistology Pub Date : 2024-02-20 DOI: 10.1016/j.ejop.2024.126064

Dmitry G. Zagumyonnyi, Denis V. Tikhonenkov

{"title":"A new centrohelid heliozoan, Pterocystis polycristalepis sp. nov., and taxonomic and phylogenetic concerns within Pterista (Haptista: Centroplasthelida)","authors":"Dmitry G. Zagumyonnyi, Denis V. Tikhonenkov","doi":"10.1016/j.ejop.2024.126064","DOIUrl":"10.1016/j.ejop.2024.126064","url":null,"abstract":"<div>A new species of centrohelid heliozoans, Pterocystis polycristalepis sp. nov. (Pterocystidae), was examined using light and electron microscopy. The novel centrohelid is characterized by the presence of leaf-like spine-scales with a broad pedicel-like structure on the proximal part and many subparallel ribs on the lateral wing surface. The plate-scales are ovoid with medial tubular thickening and many subparallel ribs on the very extensive marginal rim. The closely related species Pterocystis striata has also been studied in detail using light and electron microscopy. Phylogenetic analysis of 18S rRNA gene sequences placed both species into a separate clade within Pterista. The closest morphologically characterized species to the new clade is Triangulopteris lacunata. The 18S rRNA sequence of Pseudoraphidiophrys veliformis was grouped within Pterista and found to be closely related to Pterocystis polycristalepis, Pterocystis striata, and Triangulopteris lacunata. Cyst-scales of various shapes, cell and cyst aggregations, syncytia, and a cell with a stalk were revealed in a clonal culture of P. veliformis. Analysis of the morphology and phylogenetic position of the studied species and other centrohelids revealed a large number of taxonomic and phylogenetic problems in Pterista.</div>","PeriodicalId":12042,"journal":{"name":"European journal of protistology","volume":"94 ","pages":"Article 126064"},"PeriodicalIF":2.9,"publicationDate":"2024-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139927991","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Rumen ciliates (Ciliophora, Trichostomatia) in Brazilian domestic cattle feeding on diets with crescent urea levels 巴西家养牛新月形尿素水平饲粮中的瘤胃纤毛虫（纤毛虫、三代寄生虫

IF 2.9 2区生物学

European journal of protistology Pub Date : 2024-02-12 DOI: 10.1016/j.ejop.2024.126063

Franciane Cedrola , Suyane Costa Bordim , Pedro Braga Arcuri , Jailton da Costa Carneiro , Roberto Júnio Pedroso Dias

引用次数: 0

Single-cell transcriptomic analysis reveals genome evolution in predatory litostomatean ciliates 单细胞转录组分析揭示了掠食性纤毛虫的基因组进化过程

IF 2.9 2区生物学

European journal of protistology Pub Date : 2024-02-05 DOI: 10.1016/j.ejop.2024.126062

Zhaorui Zhou , Chao Li , Qingxiang Yuan , Yong Chi , Yuqing Li , Ying Yan , Saleh A. Al-Farraj , Naomi A. Stover , Zigui Chen , Xiao Chen

{"title":"Single-cell transcriptomic analysis reveals genome evolution in predatory litostomatean ciliates","authors":"Zhaorui Zhou , Chao Li , Qingxiang Yuan , Yong Chi , Yuqing Li , Ying Yan , Saleh A. Al-Farraj , Naomi A. Stover , Zigui Chen , Xiao Chen","doi":"10.1016/j.ejop.2024.126062","DOIUrl":"https://doi.org/10.1016/j.ejop.2024.126062","url":null,"abstract":"<div>Many ciliated protists prey on other large microbial organisms, including other protists and microscopic metazoans. The ciliate class Litostomatea unites both predatory and endosymbiotic species. The evolution of predation ability in ciliates remains poorly understood, in part, due to a lack of genomic data. To fill this gap, we acquired the transcriptome profiles of six predatory litostomateans using single-cell sequencing technology and investigated their transcriptomic features. Our results show that: (1) in contrast to non-predatory ciliates, the predatory litostomateans have expanded gene families associated with transmembrane activity and reactive oxidative stress response pathways, potentially as a result of cellular behaviors such as fast contraction and extension; (2) the expansion of the calcium-activated BK potassium channel gene family, which hypothetically regulates cell contractility, is an ancient evolutionary event for the class Litostomatea, suggesting a rewired metabolism associated with the hunting behavior of predatory ciliates; and (3) three whole genome duplication (WGD) events have been detected in litostomateans, with genes associated with biosynthetic processes, transmembrane activity, and calcium-activated potassium channel activity being retained during the WGD events. In addition, we explored the evolutionary relationships among 17 ciliate species, including eight litostomateans, and provided a rich foundational dataset for future in-depth phylogenomic studies of Litostomatea. Our comprehensive analyses suggest that the rewired cellular metabolism via expanded gene families and WGD events might be the potential genetic basis for the predation ability of raptorial ciliates.</div>","PeriodicalId":12042,"journal":{"name":"European journal of protistology","volume":"93 ","pages":"Article 126062"},"PeriodicalIF":2.9,"publicationDate":"2024-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139748116","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Nuclear genome of dinoflagellates: Size variation and insights into evolutionary mechanisms 甲藻的核基因组：尺寸变化和对进化机制的见解

IF 2.9 2区生物学

European journal of protistology Pub Date : 2024-02-03 DOI: 10.1016/j.ejop.2024.126061

Hui Wang , Peiling Wu , Lu Xiong , Han-Sol Kim , Jin Ho Kim , Jang-Seu Ki

{"title":"Nuclear genome of dinoflagellates: Size variation and insights into evolutionary mechanisms","authors":"Hui Wang , Peiling Wu , Lu Xiong , Han-Sol Kim , Jin Ho Kim , Jang-Seu Ki","doi":"10.1016/j.ejop.2024.126061","DOIUrl":"10.1016/j.ejop.2024.126061","url":null,"abstract":"<div>Recent progress in high-throughput sequencing technologies has dramatically increased availability of genome data for prokaryotes and eukaryotes. Dinoflagellates have distinct chromosomes and a huge genome size, which make their genomic analysis complicated. Here, we reviewed the nuclear genomes of core dinoflagellates, focusing on the genome and cell size. Till now, the genome sizes of several dinoflagellates (more than 25) have been measured by certain methods (e.g., flow cytometry), showing a range of 3–250 pg of genomic DNA per cell. In contrast to their relatively small cell size, their genomes are huge (about 1–80 times the human haploid genome). In the present study, we collected the genome and cell size data of dinoflagellates and compared their relationships. We found that dinoflagellate genome size exhibits a positive correlation with cell size. On the other hand, we recognized that the genome size is not correlated with phylogenetic relatedness. These may be caused by genome duplication, increased gene copy number, repetitive non-coding DNA, transposon expansion, horizontal gene transfer, organelle-to-nucleus gene transfer, and/or mRNA reintegration into the genome. Ultimate verification of these factors as potential causative mechanisms would require sequencing of more dinoflagellate genomes in the future.</div>","PeriodicalId":12042,"journal":{"name":"European journal of protistology","volume":"93 ","pages":"Article 126061"},"PeriodicalIF":2.9,"publicationDate":"2024-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139680308","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Newly identified diversity of Dinomycetaceae (Rhizophydiales, Chytridiomycota), a family of fungal parasites of marine dinoflagellates 新发现的海洋甲藻真菌寄生家族 Dinomycetaceae（Rhizophydiales, Chytridiomycota）的多样性

IF 2.9 2区生物学

European journal of protistology Pub Date : 2024-01-26 DOI: 10.1016/j.ejop.2024.126053

Alan Denis Fernández-Valero , Sergey A. Karpov , Nagore Sampedro , Jordina Gordi , Natàlia Timoneda , Esther Garcés , Albert Reñé

{"title":"Newly identified diversity of Dinomycetaceae (Rhizophydiales, Chytridiomycota), a family of fungal parasites of marine dinoflagellates","authors":"Alan Denis Fernández-Valero , Sergey A. Karpov , Nagore Sampedro , Jordina Gordi , Natàlia Timoneda , Esther Garcés , Albert Reñé","doi":"10.1016/j.ejop.2024.126053","DOIUrl":"10.1016/j.ejop.2024.126053","url":null,"abstract":"<div>We identified two new parasite species of Chytridiomycota isolated during blooms of the dinoflagellate Alexandrium minutum in the coastal Mediterranean Sea. Light and electron microscopy together with molecular characterization of the nuclear 18S, ITS, and 28S rDNA regions led to their identification as two new species, Dinomyces gilberthii and Paradinomyces evelyniae, both belonging to the family Dinomycetaceae, order Rhizophydiales. Dinomyces gilberthii differs from the previously described D. arenysensis by the presence of discharge papillae and the development of a drop-shaped sporangium. Paradinomyces evelyniae differs from the previously described P. triforaminorum by the prominent lipid globule present in early sporangia and by the pointed end producing a rhizoid. The two chytrids differed in their geographical distribution. Dinomyces gilberthii was detected in several Mediterranean habitats, including harbours and beaches, and was particularly prevalent during summer dinoflagellate blooms. Its widespread occurrence in coastal ecosystems suggested a high level of adaptability to this environment. Paradinomyces evelyniae had a more restricted distribution in the coastal-marine environment, occurring in harbour sediments and only occasionally in the water column during winter and early spring. Paradinomyces evelyniae has previously been detected in the Baltic Sea, suggesting that its distribution encompasses contrasting coastal environments, although its presence is rare.</div>","PeriodicalId":12042,"journal":{"name":"European journal of protistology","volume":"93 ","pages":"Article 126053"},"PeriodicalIF":2.9,"publicationDate":"2024-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0932473924000038/pdfft?md5=f398b8db6d22cba7e082c1c9eb490c2f&pid=1-s2.0-S0932473924000038-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139588786","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0