Description of the pseudocryptic species Conticribra weissflogiopsis sp. nov. (Thalassiosirales, Bacillariophyta) isolated from brackish waters in Korea, based on its cingulum structure and molecular analysis

Park, Joon‐Sang; Lee, Jin Hwan

doi:10.11646/phytotaxa.191.1.7

Cited by 7 publications

(4 citation statements)

References 30 publications

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“…This was especially evident for the two strains of C. sinica, which exhibited the largest inter-specific genetic distance with the other Conticribra species (i.e., 0.03 -0.09 p-distances). These sequence comparisons are consistent with those from Park et al (Park et al 2014), and the topology of clustering patterns in our phylogenetic analysis.…”

Section: Resultssupporting

confidence: 92%

“…The presence of valve face fultoportulae is a characteristic that distinguishes living and fossil Conticribra species. C. guillardii have 0-4 valve face fultoportulae (Hasle 1978), C. weissflogii exhibits many valve face fultoportulae on the subcentral area (Fryxell & Hasle 1977), and C. weissflogiopsis exhibits 2-12 valve face fultoportulae on the subcentral area (Park & Lee 2014).…”

Section: Introductionmentioning

confidence: 99%

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A new freshwater species Conticribra sinica (Thalassiosirales, Bacillariophyta) from the lower reaches of the Yangtze River, China

Yu¹,

Lin²,

You³

et al. 2022

Fottea

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A new freshwater diatom species Conticribra sinica sp. nov. Yu, You et Wang from three lakes in the lower reaches of the Yangtze River, China, is described here using a combination of morphological and molecular data from ribosomal DNA genes. The primary distinguishing characteristic of C. sinica was the presence of a non-plicate or slightly-plicate valve face and a single ring marginal fultoportulae that was located at the junction between the valve face and the mantle. There were 4-11 valve face fultoportulae that were located at the subcenter of the valve face. In addition, a single rimoportula replaced a marginal fultoportulae. Areolae loculate were open to the outside by irregularly circular foramina or slit foramina that are radially arranged. Internally, cribra were continuously arranged long a radial arrangement of areolae. Characteristics of the new species with other similar species of Conticribra. Phylogenetic analysis of the nuclear small subunit (SSU) rDNA sequences and nuclear large subunit (LSU) rDNA gene sequences revealed that C. sinica in a single clade at a considerable sequence distance from the other Conticribra species.

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Section: Resultssupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

A new freshwater species Conticribra sinica (Thalassiosirales, Bacillariophyta) from the lower reaches of the Yangtze River, China

Yu¹,

Lin²,

You³

et al. 2022

Fottea

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show abstract

“…The genomic DNA was extracted from cell pellets by using a DNeasy® Plant Mini Kit (Qiagen, Hilden, Germany). Nuclear rDNA fragments [i.e., nearly full-length small subunit ribosomal DNA ( SSU rDNA) gene and the D1–D3 region of the large subunit ribosomal DNA ( LSU rDNA)] and plastid-encoding genes ( psb C and rbc L) were amplified and sequenced following protocols outlined in Alverson et al [ 3 ] and Park & Lee [ 20 ]. Newly generated DNA sequences are available from GenBank using accession numbers KY912618, KY912621, KY912624, and KY912625 for T .…”

Section: Methodsmentioning

confidence: 99%

Transfer of the small diatoms Thalassiosira proschkinae and T. spinulata to the genus Minidiscus and their taxonomic re-description

Park

Jung

et al. 2017

PLoS ONE

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The marine diatoms Thalassiosira proschkinae and T. spinulata are relatively small in size; their taxonomic identities have been debated owing to the diverse morphological variations. In the present study, we isolated both morphotypes from Korean coastal waters and examined their fine structures and conducted molecular sequence comparisons. The morphological and molecular analyses showed that T. proschkinae and T. spinulata were certainly distinct, and phenotypic plasticity of valve structure was not noted. Based on the morphological similarity and phylogenetic relationship, we transferred T. proschkinae and T. spinulata to another genus Minidiscus within Thalassiosirales that includes small-sized species and proposed new combination names, Minidiscus proschkinae (Makarova) Park & Lee comb. nov. and Minidiscus spinulatus (Takano) Park & Lee comb. nov., respectively. The genus description of Minidiscus was emended.

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“…GQ414523) were analyzed using the blast search in NCBI. The molecular data in the present paper suggested that C. weissflogii (ND-8) and other Conticribra species form a monophyletic group separated from some species of Thalassiosira, which was described as a new species from three additional areas of Korea (Park and Lee, 2014). In 18S analysis, C. weissflogii (ND-8) clustered with C. weissflogii (EF585582) ( Figure 1C ), T. oceanica (AF374479) and T. fluviatilis (AJ535170), and with a sister clade comprising C. guillardii (AF374478).…”

Section: Resultsmentioning

confidence: 60%

Fucoxanthin, a Marine Xanthophyll Isolated From Conticribra weissflogii ND-8: Preventive Anti-Inflammatory Effect in a Mouse Model of Sepsis

Guo

Huang

et al. 2019

Front. Pharmacol.

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Background: Fucoxanthin (FX), a xanthophyll pigment which occurs in marine brown algae with remarkable biological properties, has been proven to be safe for consumption by animals. Although FX has various pharmacological effects including anti-inflammatory, anti-tumor, anti-obesity, antioxidant, anti-diabetic, anti-malarial, and anti-lipid, in vivo protective effect against sepsis has not been reported. In this study, we aimed at evaluation the efficacy of the FX in a model of sepsis mouse. Methods: FX was successfully isolated from Conticribra weissflogii ND-8 for the first time. The FX was identified by thin-layer chromatography (TLC), high-performance liquid chromatography-mass spectrometry (HPLC-MS), and nuclear magnetic resonance (NMR). Animals were randomly divided into 9 groups, including Sham group (mouse received an intraperitoneal injection of normal saline 1.0 ml/kg), FX-treated (0.1–1.0 ml/kg), Lipopolysaccharide (LPS)-treated (20 mg/kg), FX+LPS-treated (0.1–10.0 mg/kg and 20 mg/kg, respectively), and urinastatin groups (10 4 U/kg). Nuclear factor (NF)-κB activation could be potential treatment for sepsis. NF-κB signaling components were determined by western-blotting. IL-6, IL-1β, TNF-α production, and NF-κB activation were evaluated by ELISA and immunofluorescent staining in vitro . Results: FX was found to decrease the expression of inflammatory cytokines including IL-6, IL-1β, and TNF-α, in a prophylactic manner in the LPS-induced sepsis mouse model. Meanwhile, FX significantly inhibits phosphorylation of the NF-κB signaling pathway induced by LPS at the cellular level and reduces the nuclear translocation of NF-κB. The IC 50 for suppressing the expression of NF-κB was 11.08 ± 0.78 μM in the THP1-Lucia™ NF-κB cells. Furthermore, FX also inhibits the expression of inflammatory factors in a dose-dependent manner with the IC 50 inhibition of IL-6 production was 2.19 ± 0.70 μM in Raw267.4 macrophage cells. It is likely that the molecules with the ability of targeting NF-κB activation and inflammasome assembly, such as fucoxanthin, are interesting subjects to be used for treating sepsis.

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Description of the pseudocryptic species Conticribra weissflogiopsis sp. nov. (Thalassiosirales, Bacillariophyta) isolated from brackish waters in Korea, based on its cingulum structure and molecular analysis

Cited by 7 publications

References 30 publications

A new freshwater species Conticribra sinica (Thalassiosirales, Bacillariophyta) from the lower reaches of the Yangtze River, China

A new freshwater species Conticribra sinica (Thalassiosirales, Bacillariophyta) from the lower reaches of the Yangtze River, China

Transfer of the small diatoms Thalassiosira proschkinae and T. spinulata to the genus Minidiscus and their taxonomic re-description

Fucoxanthin, a Marine Xanthophyll Isolated From Conticribra weissflogii ND-8: Preventive Anti-Inflammatory Effect in a Mouse Model of Sepsis

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