Redescription of Two Marine Ciliates (Ciliophora: Urostylida: Pseudokeronopsidae), Pseudokeronopsis carnea and Uroleptopsis citrina, from Korea

Baek, Ye-Seul; Jung, Jae-Ho; Min, Gi–Sik

doi:10.5635/kjsz.2011.27.3.220

Cited by 4 publications

(12 citation statements)

References 12 publications

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“…Urostyloid ciliates are one of the largest groups within the Spirotrichea Bütschli, 1889, a highly diverse class that consists of about 2000 described species distributed worldwide (Baek et al 2011;Berger 2003Berger , 2006Bharti et al 2015;Borror 1972;Borror and Wicklow 1983; The urostyloid genus Anteholosticha was established by Berger (2003) to include certain species previously assigned to the genus Holosticha sensu Borror (1972) that lack distinct autapomorphies of the latter (e.g. anterior end of the left marginal row curved rightwards, the bipartite adoral zone and the buccal cirrus distinctly ahead of the paroral).…”

Section: Introductionmentioning

confidence: 99%

Redescription of two little-known urostyloid ciliates, Anteholosticha randani (Grolière, 1975) Berger, 2003 and A. antecirrata Berger, 2006 (Ciliophora, Urostylida)

Fan

Huang

et al. 2016

European Journal of Protistology

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Section: Introductionmentioning

confidence: 99%

Redescription of two little-known urostyloid ciliates, Anteholosticha randani (Grolière, 1975) Berger, 2003 and A. antecirrata Berger, 2006 (Ciliophora, Urostylida)

Fan

Huang

et al. 2016

European Journal of Protistology

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“…(, ) and Baek et al. () as those of P. pararubra , and P. rubra and from Yi et al. () as those of P. songi sp.…”

Section: Discussionmentioning

confidence: 99%

“…() and Baek et al. () reported two populations of P. pararubra under the name P. carnea . Since then, no population has ever been reported for this species.…”

Section: Discussionmentioning

confidence: 99%

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Systematics and Molecular Phylogeny of the Ciliate Genus Pseudokeronopsis (Ciliophora, Hypotrichia)

Zhan

2017

J Eukaryotic Microbiology

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A still challenging study on ciliate systematics is to clarify the taxonomic and phylogenetic confusions of the fascinating pigmented Pseudokeronopsis species because of their high interspecific similarities. We evaluated the identities and internal relationships within Pseudokeronopsis based on morphological descriptions in combination with the 18S and ITS-5.8S rDNA genetic distances, ITS2 secondary structures and phylogenetic analyses. Results showed that (1) Pseudokeronopsis pararubra, a species ever synonymized as Pseudokeronopsis carnea, is a valid species; (2) most Chinese populations identified as Pseudokeronopsis rubra represent a new species namely Pseudokeronopsis songi sp. nov.; (3) within Pseudokeronopsis, P. carnea branched early, while P. songi sp. nov., P. flava, and P. erythrina showed close relationships and formed a sister clade with P. pararubra; (4) compared to 18S and ITS2 rDNA, ITS-5.8S rDNA is more suitable for separating Pseudokeronopsis species, with pairwise distances of 0-0.0441 at the intraspecific level and 0.0635-0.1150 at the interspecific level; and (5) the core structure of Pseudokeronopsis ITS2 includes three helices, with helix III being the longest and showing an identical pattern in conspecific populations and small differences among species. Based on the evaluation, we clarify all misidentified and dubious 18S and ITS-5.8S rDNA sequences of Pseudokeronopsis in GenBank.

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Comparative Genome Analysis Reveals Cis-Regulatory Elements on Gene-Sized Chromosomes of Ciliated Protists

Zhang

Dou

et al. 2022

Front. Microbiol.

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Gene-sized chromosomes are a distinct feature of the macronuclear genome in ciliated protists known as spirotrichs. These nanochromosomes are often only several kilobase pairs long and contain a coding region for a single gene. However, the ways in which transcription is regulated on nanochromosomes is still largely unknown. Here, we generated macronuclear genome assemblies for two species of Pseudokeronopsis ciliates to better understand transcription regulation on gene-sized chromosomes. We searched within the short subtelomeric regions for potential cis-regulatory elements and identified distinct AT-rich sequences conserved in both species, at both the 5’ and 3’ end of each gene. We further acquired transcriptomic data for these species, which showed the 5’ cis-regulatory element is associated with active gene expression. Gene family evolution analysis suggests nanochromosomes in spirotrichs may originated approximately 900 million years ago. Together our comparative genomic analyses reveal novel insights into the biological roles of cis-regulatory elements on gene-sized chromosomes.

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Redescription of Two Marine Ciliates (Ciliophora: Urostylida: Pseudokeronopsidae), Pseudokeronopsis carnea and Uroleptopsis citrina, from Korea

Cited by 4 publications

References 12 publications

Redescription of two little-known urostyloid ciliates, Anteholosticha randani (Grolière, 1975) Berger, 2003 and A. antecirrata Berger, 2006 (Ciliophora, Urostylida)

Redescription of two little-known urostyloid ciliates, Anteholosticha randani (Grolière, 1975) Berger, 2003 and A. antecirrata Berger, 2006 (Ciliophora, Urostylida)

Systematics and Molecular Phylogeny of the Ciliate Genus Pseudokeronopsis (Ciliophora, Hypotrichia)

Comparative Genome Analysis Reveals Cis-Regulatory Elements on Gene-Sized Chromosomes of Ciliated Protists

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