Abstract:
:This article provides an overview of research on chromatin diminution (CD) in copepods. The phenomenology, mechanisms and biological role of CD are discussed. A model of CD as an alternative means of regulating cell differentiation is presented. While the vast majority of eukaryotes inactivate genes that are no longer needed in development by heterochromatinization, copepods probably use CD for the same purpose. It is assumed that the copepods have exploited CD as a tool for adaptation to changing environmental conditions and as a mechanism for regulating the rate of evolutionary processes.
journal_name
Comp Cytogenetjournal_title
Comparative cytogeneticsauthors
Grishanin Adoi
10.3897/CompCytogen.v8i1.5913subject
Has Abstractpub_date
2014-01-09 00:00:00pages
1-10issue
1eissn
1993-0771issn
1993-078Xjournal_volume
8pub_type
杂志文章abstract::The genomes of five Agropyron Gaertner, 1770 species were characterized using all potential di- or trinucleotide simple sequence repeat (SSR) motifs and four satellite DNA repeats as fluorescence in situ hybridization (FISH) probes. The sites of 5S and 45S rDNA were relatively conserved among the diploid and tetraploi...
journal_title:Comparative cytogenetics
pub_type: 杂志文章
doi:10.3897/CompCytogen.v11i3.13124
更新日期:2017-08-03 00:00:00
abstract::Stingless bees are distributed widely in the tropics, where they are major pollinators of several plant species. In this study, the karyotype of Meliponaquinquefasciata Lepeletier, 1836 was analysed, with emphasis on the presence of B chromosomes. Post-defecating larvae were analysed using Giemsa staining, the C-bandi...
journal_title:Comparative cytogenetics
pub_type: 杂志文章
doi:10.3897/CompCytogen.v12i4.29165
更新日期:2018-11-09 00:00:00
abstract::We report the karyotype, some aspects of spermatogenesis, and ovarian trophocytes ploidy in three aquatic bug species: Ilyocoris cimicoides (Linnaeus, 1758), Notonecta glauca Linnaeus, 1758, and Diplonychus rusticus Fabricius, 1871 from previously unexplored regions - South Europe (Bulgaria) and Southeast Asia (Vietna...
journal_title:Comparative cytogenetics
pub_type: 杂志文章
doi:10.3897/CompCytogen.v14i1.48709
更新日期:2020-03-05 00:00:00
abstract::Setaria Beauvois, 1812 is a genus of economically important forage species, including Setaria italica (Linnaeus, 1753) Beauvois, 1812 and Setaria viridis (Linnaeus, 1753) Beauvois, 1812, closely related species and considered as model systems for studies of C4 plants. However, complications and uncertainties related t...
journal_title:Comparative cytogenetics
pub_type: 杂志文章
doi:10.3897/CompCytogen.v9i4.5456
更新日期:2015-10-07 00:00:00
abstract::Immunocytochemical and electron microscopic analysis of synaptonemal complexes (SCs) was carried out for the first time in homozygotes and complex Robertsonian heterozygotes (hybrids) of the common shrew, Sorex araneus Linnaeus, 1758, from a newly discovered hybrid zone between the Moscow and the Neroosa chromosomal r...
journal_title:Comparative cytogenetics
pub_type: 杂志文章
doi:10.3897/CompCytogen.v6i3.3701
更新日期:2012-09-14 00:00:00
abstract::Chromosome morphometry and nuclear DNA content are useful data for cytotaxonomy and to understand the evolutionary history of different taxa. For the genus Bromus Linnaeus, 1753, distinct ploidy levels have been reported, occurring from diploid to duodecaploid species. The geographic distribution of Bromus species has...
journal_title:Comparative cytogenetics
pub_type: 杂志文章
doi:10.3897/CompCytogen.v11i2.11572
更新日期:2017-04-07 00:00:00
abstract::Phaneropterinae is the largest subfamily of Tettigoniidae, distributed across the globe. There are few cytogenetic studies regarding this group, as in the case of the genus group Aniarae, which represents only two karyotyped species. The current study aims to analyze cytogenetically three species of Hyperophora Brunne...
journal_title:Comparative cytogenetics
pub_type: 杂志文章
doi:10.3897/CompCytogen.v13i1.31803
更新日期:2019-04-02 00:00:00
abstract::Synaptonemal complex (SC) chains were revealed in semisterile intraspecific F1 hybrids of Ellobius tancrei Blasius, 1884 (2n = 49, NF=56 and 2n=50, NF=56), heterozygous for Robertsonian (Rb) translocations. Chains were formed by Rb submetacentrics with monobrachial homology. Chromosome synapsis in spermatocytes of the...
journal_title:Comparative cytogenetics
pub_type: 杂志文章
doi:10.3897/CompCytogen.v9i4.5674
更新日期:2015-12-02 00:00:00
abstract::In the present study, the chromosomes numbers were confirmed, 2n = 34 for Amaranthus cruentus Linnaeus, 1759, and 2n = 32 for Amaranthus hypochondriacus Linnaeus, 1753, Amaranthus mantegazzianus Passer, 1864, and Amaranthus caudatus Linnaeus, 1753. The distribution and variability of constitutive heterochromatin were ...
journal_title:Comparative cytogenetics
pub_type: 杂志文章
doi:10.3897/CompCytogen.v7i1.4276
更新日期:2013-03-26 00:00:00
abstract::The subfamily Harpactorinae is composed of six tribes. Phylogenetic studies bring together some of Harpactorinae tribes, but by and large the data on evolutionary relationships of the subfamily are scarce. Chromosome studies are of great importance for understanding the systematics of different groups of insects. For ...
journal_title:Comparative cytogenetics
pub_type: 杂志文章
doi:10.3897/CompCytogen.v10i4.10392
更新日期:2016-12-09 00:00:00
abstract::The elephantfish family Mormyridae is the most diverse lineage of the primitive teleostean clade Osteoglossomorpha distributed in inland waters of all continents except Antarctica and Europe. The family Mormyridae is endemic to Africa and includes 22 genera and almost 230 species. The evolutionary radiation of mormyri...
journal_title:Comparative cytogenetics
pub_type: 杂志文章
doi:10.3897/CompCytogen.14i3.52727
更新日期:2020-08-19 00:00:00
abstract::The genus Pseudophoxinus Bleeker, 1860 is found in a wide range of habitats in central Anatolia, but it is not well known from a cytogenetic aspect. In this study the first karyotypic description of the spring minnows Pseudophoxinuscrassus (Ladiges, 1960) and Pseudophoxinushittitorum Freyhof & Özulug, 2010 by means of...
journal_title:Comparative cytogenetics
pub_type: 杂志文章
doi:10.3897/CompCytogen.v8i4.7623
更新日期:2014-10-31 00:00:00
abstract::Chromosome morphometry and nuclear DNA content are useful data for cytotaxonomy and for understanding the evolutionary history of different taxa. However, the chromosome number is the only karyotype aspect reported for the species of Dorstenia so far. In this study, the nuclear genome size of Dorstenia arifolia (Lamar...
journal_title:Comparative cytogenetics
pub_type: 杂志文章
doi:10.3897/CompCytogen.v10i1.6719
更新日期:2016-01-22 00:00:00
abstract::Ninety individuals of the characid fish Astyanax fasciatus (Cuvier, 1819) were collected at Água da Madalena stream (Botucatu, São Paulo, Brazil) and analyzed for diploid chromosome number 2n and karyotype composition as well as for the chromosomal location of the 5S and 18S ribosomal DNA (rDNA). Whereas no chromosome...
journal_title:Comparative cytogenetics
pub_type: 杂志文章
doi:10.3897/CompCytogen.v6i1.2151
更新日期:2012-01-24 00:00:00
abstract::Cichlids represent one of the most species-rich families of fishes and have attracted the attention of evolutionary biologists due to the rapid radiation occurring in some groups and the importance of some species in the world aquaculture. Cytogenetic analysis was conducted in 10 cichlid species from the Araguaia Rive...
journal_title:Comparative cytogenetics
pub_type: 杂志文章
doi:10.3897/CompCytogen.v6i2.1739
更新日期:2012-04-27 00:00:00
abstract::Cytogenetic features of the hangingfly Bittacus sinicus Issiki, 1931 were investigated for the first time using C-banding and DAPI (4',6-diamidino-2-phenylindole) staining. The karyotype analyses show that the male B. sinicus possesses the lowest chromosome number (2n = 15) ever observed in Mecoptera, and an almost sy...
journal_title:Comparative cytogenetics
pub_type: 杂志文章
doi:10.3897/CompCytogen.v14i3.53533
更新日期:2020-07-30 00:00:00
abstract::Plantago lagopus is a diploid (2n = 2x =12) weed belonging to family Plantaginaceae. We reported a novel B chromosome in this species composed of 5S and 45S ribosomal DNA and other repetitive elements. In the present work, presence of B chromosome(s) was confirmed through FISH on root tip and pollen mother cells. Seve...
journal_title:Comparative cytogenetics
pub_type: 杂志文章
doi:10.3897/CompCytogen.11i2.11779
更新日期:2017-05-22 00:00:00
abstract::[This corrects the article DOI: 10.3897/CompCytogen.v11i1.10339.]. ...
journal_title:Comparative cytogenetics
pub_type: 杂志文章,已发布勘误
doi:10.3897/CompCytogen.v11i4.21560
更新日期:2017-12-08 00:00:00
abstract::[This corrects the article DOI: 10.3897/CompCytogen.v14i2.49513.]. ...
journal_title:Comparative cytogenetics
pub_type: 已发布勘误
doi:10.3897/CompCytogen.v14i4.56080
更新日期:2020-12-29 00:00:00
abstract::Chromosome counts and karyotype characterization have proved to be important features of a genome. Chromosome changes during the diversification of ants might play an important role, given the diversity and success of Formicidae. Comparative karyotype analyses on ants have enriched and helped ant systematics. Among le...
journal_title:Comparative cytogenetics
pub_type: 杂志文章
doi:10.3897/CompCytogen.v12i1.21799
更新日期:2018-01-09 00:00:00
abstract::Several strains of the apparently well-known cosmopolitan synanthropic parasitoid of coleopteran stored-product pests, Lariophagusdistinguendus (Förster, 1841) from Western Europe, were studied using DNA sequencing and chromosomal analysis. The presence of at least two cryptic species with different COI sequences and ...
journal_title:Comparative cytogenetics
pub_type: 杂志文章
doi:10.3897/CompCytogen.v13i2.34492
更新日期:2019-06-11 00:00:00
abstract::The centromere is a chromosomal region where the kinetochore is formed, which is the attachment point of spindle fibers. Thus, it is responsible for the correct chromosome segregation during cell division. Telomeres protect chromosome ends against enzymatic degradation and fusions, and localize chromosomes in the cell...
journal_title:Comparative cytogenetics
pub_type: 杂志文章,评审
doi:10.3897/CompCytogen.v14i2.51895
更新日期:2020-07-07 00:00:00
abstract::Valeriana jatamansi, a medicinally important species of the family Valerianaceae, has been cytologically studied in different geographical areas of North-Western Himalayan region of India. The tetraploid cytotype with chromosome numbers 2n=32 is in conformity with the earlier reports of the species from different part...
journal_title:Comparative cytogenetics
pub_type: 杂志文章
doi:10.3897/CompCytogen.v9i4.8875
更新日期:2015-08-07 00:00:00
abstract::The African chironomid Polypedilumvanderplanki Hinton, 1951 is the only chironomid able to withstand almost complete desiccation in an ametabolic state known as anhydrobiosis. The karyotypes of two allopatric populations of this anhydrobiotic chironomid, one from Nigeria and another from Malawi, were described accordi...
journal_title:Comparative cytogenetics
pub_type: 杂志文章
doi:10.3897/CompCytogen.v9i2.9104
更新日期:2015-05-11 00:00:00
abstract::The karyotypes and the localization of C-bands, clusters of ribosomal DNA and telomeric repeats of 10 species of the family Pamphagidae from Morocco are described for the first time. The species studied belong to the subfamilies Pamphaginae and Thrinchinae. All species have karyotypes consisting of 19 and 20 acrocentr...
journal_title:Comparative cytogenetics
pub_type: 杂志文章
doi:10.3897/CompCytogen.v13i1.32039
更新日期:2019-02-27 00:00:00
abstract::The fluorescent in situ hybridization (FISH) technique has been applied to somatic chromosomes in the medicinally important species, Bunium persicum, to elucidate its karyotypes. The bicolour FISH technique involving 18S-5.8S-26S and 5S ribosomal RNA genes as probes was used to assign physical localization and measure...
journal_title:Comparative cytogenetics
pub_type: 杂志文章
doi:10.3897/CompCytogen.v5i4.965
更新日期:2011-11-09 00:00:00
abstract::A new monotypic genus and species, Komodesia circuliplurimagen. et sp. n., from Flores Is. (Indonesia) and the new species, Antonina diversiglandulosasp. n., from Southern Thailand are described and illustrated. Chromosomes of these species and also the ones of Antonina purpurea Signoret, 1872 and Antonina thaiensis T...
journal_title:Comparative cytogenetics
pub_type: 杂志文章
doi:10.3897/CompCytogen.v10i4.10503
更新日期:2016-11-04 00:00:00
abstract::The species-rich and widespread genus Taraxacum F. H. Wiggers, 1780 (Asteraceae subfamily Cichorioideae) is one of the most taxonomically complex plant genera in the world, mainly due to its combination of different sexual and asexual reproduction strategies. Polyploidy is usually confined to apomictic microspecies, v...
journal_title:Comparative cytogenetics
pub_type: 杂志文章
doi:10.3897/CompCytogen.v12i3.27307
更新日期:2018-09-18 00:00:00
abstract::A lectotype is designated for the Tibetan species Deronectesemmerichi Falkenström, 1936 (Currently Boreonectesemmerichi (Falkenström)), and its habitus, as well as the median lobe and parameres of its aedeagus, are figured along with additional comparative material. Material of Boreonectesemmerichi from Sikkim (BMNH) ...
journal_title:Comparative cytogenetics
pub_type: 杂志文章
doi:10.3897/CompCytogen.v9i1.4463
更新日期:2015-03-31 00:00:00
abstract::The Tc1 mariner element is widely distributed among organisms and have been already described in different species of fish. The genus Ancistrus (Kner, 1854) has 68 nominal species and is part of an interesting taxonomic and cytogenetic group, as well as presenting a variation of chromosome number, ranging from 2n=34 t...
journal_title:Comparative cytogenetics
pub_type: 杂志文章
doi:10.3897/CompCytogen.v11i1.10519
更新日期:2017-01-20 00:00:00