Epigenetic influences of mobile genetic elements on ciliate genome architecture and evolution

Timmons, Caitlin; Shazib, Shahed Uddin Ahmed; Katz, Laura A.

doi:10.1111/jeu.12891

Cited by 3 publications

(3 citation statements)

References 155 publications

(275 reference statements)

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“…The development of the new macronucleus is thus under epigenetic control. As recent reviews have sufficiently summarized this topic (31,42,124), we do not go into detail here. The essential point is that once eliminated from the macronucleus, a particular sequence will remain so after future episodes of sexual reproduction.…”

Section: Model Speciesmentioning

confidence: 99%

“…Here, we integrate these recent results with the historical legacy of studies in Paramecium genetics. We focus, in particular, on the genetics and evolutionary genomics of Paramecium, noting that recent systematic reviews have appeared on related topics, such as genome rearrangement and epigenetics during sexual processes (31,42,124) and evolutionary bioenergetics (81).…”

Section: Introductionmentioning

confidence: 99%

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Paramecium Genetics, Genomics, and Evolution

Long,

Johri,

Gout

et al. 2023

Annu. Rev. Genet.

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The ciliate genus Paramecium served as one of the first model systems in microbial eukaryotic genetics, contributing much to the early understanding of phenomena as diverse as genome rearrangement, cryptic speciation, cytoplasmic inheritance, and endosymbiosis, as well as more recently to the evolution of mating types, introns, and roles of small RNAs in DNA processing. Substantial progress has recently been made in the area of comparative and population genomics. Paramecium species combine some of the lowest known mutation rates with some of the largest known effective populations, along with likely very high recombination rates, thereby harboring a population-genetic environment that promotes an exceptionally efficient capacity for selection. As a consequence, the genomes are extraordinarily streamlined, with very small intergenic regions combined with small numbers of tiny introns. The subject of the bulk of Paramecium research, the ancient Paramecium aurelia species complex, is descended from two whole-genome duplication events that retain high degrees of synteny, thereby providing an exceptional platform for studying the fates of duplicate genes. Despite having a common ancestor dating to several hundred million years ago, the known descendant species are morphologically indistinguishable, raising significant questions about the common view that gene duplications lead to the origins of evolutionary novelties.

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Section: Model Speciesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Paramecium Genetics, Genomics, and Evolution

Long,

Johri,

Gout

et al. 2023

Annu. Rev. Genet.

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show abstract

“…The ciliated protists are an interesting and diverse group of single-cell microbial eukaryotes that play an important role in microbial food webs and are also useful as model organisms in studies of development, evolution, and molecular biology (Obert and Vd ̌acňy, 2020;Park et al, 2020;Song et al, 2021;Vd ̌acňyá nd Foissner, 2021;Ahsan et al, 2022;Timmons et al, 2022;Valentine and Van Houten, 2022;Zhang et al, 2022b). Hypotrichs (subclass Hypotricha Stein, 1859) are a complex group of ciliates that are frequently studied but, despite this (or perhaps because of this), remains one of the most confusing groups with respect to their taxonomic and phylogenetic relationships (Chen et al, 2020;Kim et al, 2020;Li et al, 2021;Luo et al, 2021;Omar et al, 2022;Wu et al, 2022;Xu et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

The description of a new brackish water ciliate species from China, Trachelostyla aestuarina n. sp., with a species key and biogeographic investigation for Trachelostyla (Ciliophora, Sporadotrichida)

et al. 2022

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The ciliated protists are a diverse group of microbial eukaryotes that play an important role in the functioning of microbial food webs. The genus Trachelostyla Borror, 1972, comprised a few species with a non-twisted distinctly cephalized shape. The overall taxonomy has been challenging for this group, and the understanding of their diversity and distribution is therefore relatively limited. To further investigate this group, we report here on two species from the East China Sea, Trachelostyla aestuarina n. sp. and Trachelostyla caudata Borror, 1972, including their in vivo morphology, infraciliature, and phylogenetic relationships based on 18S rRNA gene sequences. The physiological reorganization stages of the latter were also investigated. T. aestuarina is characterized by a combination of features including a bipartite cell shape, a size of 150–220 × 15–35 μm, scattered cortical granules, and multiple macronuclear nodules (37–55). T. caudata has only 10 cirri in the frontal region, fewer than its congeners; thus, we improved the definition of the genus. The global distribution of Trachelostyla was summarized based on the available literature and a key to the valid species provided. This work improves the overall knowledge of hypotrich biodiversity and provides underpinning for future researchers in global regions for environmental monitoring and resource investigations.

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Molecular characterization and antibiotic resistance of Staphylococcus aureus strains isolated from patients with diarrhea in Korea between the years 2007 and 2022

Bak,

Park,

Kim

et al. 2023

Food Sci Biotechnol

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Epigenetic influences of mobile genetic elements on ciliate genome architecture and evolution

Abstract: MOBILE genetic elements (MGEs) are sequences of nucleic acids that can move either within a genome or between the genomes of different individuals or species (

Cited by 3 publications

References 155 publications

Paramecium Genetics, Genomics, and Evolution

Paramecium Genetics, Genomics, and Evolution

The description of a new brackish water ciliate species from China, Trachelostyla aestuarina n. sp., with a species key and biogeographic investigation for Trachelostyla (Ciliophora, Sporadotrichida)

Molecular characterization and antibiotic resistance of Staphylococcus aureus strains isolated from patients with diarrhea in Korea between the years 2007 and 2022

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