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Chromosomal evolution in Cryptangieae Benth. (Cyperaceae): Evidence of holocentrism and pseudomonads
Protoplasma, 2023Cryptangieae has recently been revised based on morphology and molecular phylogeny, but cytogenetic data is still scarce. We conducted this study with the aim of investigating the occurrence of holocentric chromosomes and pseudomonads, as well as understanding the mode of chromosomal evolution in the tribe.
Ana Luisa Arantes Chaves +4 more
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Neocentrics and Holokinetics (Holocentrics): Chromosomes out of the Centromeric Rules
Cytogenetic and Genome Research, 2010The centromere appears as a single constriction at mitotic metaphase in most eukaryotic chromosomes. Holokinetic chromosomes are the exception to this rule because they do not show any centromeric constrictions. Holokinetic chromosomes are usually forgotten in most reviews about centromeres, despite their presence in a number of animal and plant ...
M, Guerra +6 more
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Similar Sister Chromatid Arrangement in Mono- and Holocentric Plant Chromosomes
Cytogenetic and Genome Research, 2016Due to the X-shape formation at somatic metaphase, the arrangement of the sister chromatids is obvious in monocentric chromosomes. In contrast, the sister chromatids of holocentric chromosomes cannot be distinguished even at mitotic metaphase. To clarify their organization, we differentially labelled the sister chromatids of holocentric <i>Luzula&
Veit, Schubert +3 more
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Holocentric chromosomes may be an apomorphy of Droseraceae
Plant Systematics and Evolution, 2018Holocentric chromosomes have evolved in various plant and animal taxa, which suggests they may confer a selective advantage in certain conditions, yet their adaptive potential has scarcely been studied. One of the reasons may reside in our insufficient knowledge of the phylogenetic distribution of holocentric chromosomes across eukaryotic phylogeny. In
Pavel Kolodin +7 more
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The Phylogenetic Origins and Evolutionary History of Holocentric Chromosomes
Systematic Botany, 2016In eukaryotes, we can recognize two kinds of chromosomes, based on the location of the kinetochores. The majority of eukaryotes have monocentric chromosomes, in which kinetochoric activity is concentrated in a single locus. In several unrelated eukaryotic lineages, chromosomes are holocentric, having diffuse centromeric / kinetochoric activity along ...
Marcial Escudero +2 more
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Double-strand breaks repair by gene conversion in silkworm holocentric chromosomes
Molecular Genetics and Genomics, 2011Maintenance of genome stability relies on the accurate repair of DNA double-strand breaks (DSBs) that arise during DNA replication or introduced by DNA-damaging agents. Failure to repair such breaks can lead to the introduction of mutations and chromosomal translocations.
Hiroaki, Mon +3 more
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Chromosome Research, 2017
Despite most of the cytogenetic research is focused on monocentric chromosomes, chromosomes with kinetochoric activity localized in a single centromere, several studies have been centered on holocentric chromosomes which have diffuse kinetochoric activity along the chromosomes.
José Ignacio Márquez-Corro +2 more
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Despite most of the cytogenetic research is focused on monocentric chromosomes, chromosomes with kinetochoric activity localized in a single centromere, several studies have been centered on holocentric chromosomes which have diffuse kinetochoric activity along the chromosomes.
José Ignacio Márquez-Corro +2 more
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Segregation of holocentric chromosomes at meiosis in the nematode,Caenorhabditis elegans
Chromosome Research, 1993The meiotic segregation of the holocentric chromosomes of Caenorhabditis elegans in both spermatogenesis and oogenesis is described. The extended kinetochore typical of the mitotic chromosome could not be differentiated on meiotic bivalents; instead microtubules appeared to project into the chromatin.
D G, Albertson, J N, Thomson
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Pest Arthropods with Holocentric Chromosomes are More Resistant to Sterilizing Ionizing Radiation
Radiation Research, 2019It has been hypothesized that species with holocentric chromosomes have a selective evolutionary advantage for developmental and reproductive success because holocentric chromosomes are less susceptible to chromosome breakage than monocentric chromosomes.
František, Zedek, Petr, Bureš
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Chromosome Research, 1995
C-banded karyotypes, DNA content and the male meiiotic process of Triatoma platensis and Triatoma delpontei are compared with those of Triatoma infestans, the main vector of Chagas disease in South America. These three species present the same diploid chromosome number 2n = 22 (20 autosomes + XX male/XY female).
F, Panzera +5 more
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C-banded karyotypes, DNA content and the male meiiotic process of Triatoma platensis and Triatoma delpontei are compared with those of Triatoma infestans, the main vector of Chagas disease in South America. These three species present the same diploid chromosome number 2n = 22 (20 autosomes + XX male/XY female).
F, Panzera +5 more
openaire +2 more sources