Abstract:
:In the present study, we analyzed individuals of Hypostomus soniae (Loricariidae) collected from the Teles Pires River, southern Amazon basin, Brazil. Hypostomus soniae has a diploid chromosome number of 2n = 64 and a karyotype composed of 12 metacentric (m), 22 submetacentric (sm), 14 subtelocentric (st), and 16 acrocentric (a) chromosomes, with a structural difference between the chromosomes of the two sexes: the presence of a block of heterochromatin in sm pair No. 26, which appears to represent a putative initial stage of the differentiation of an XX/XY sex chromosome system. This chromosome, which had a heterochromatin block, and was designated proto-Y (pY), varied in the length of the long arm (q) in comparison with its homolog, resulting from the addition of constitutive heterochromatin. It is further distinguished by the presence of major ribosomal cistrons in a subterminal position of the long arm (q). The Nucleolus Organizer Region (NOR) had different phenotypes among the H. soniae individuals in terms of the number of Ag-NORs and 18S rDNA sites. The origin, distribution and maintenance of the chromosomal polymorphism found in H. soniae reinforced the hypothesis of the existence of a proto-Y chromosome, demonstrating the rise of an XX/XY sex chromosome system.
journal_name
Comp Cytogenetjournal_title
Comparative cytogeneticsauthors
de Oliveira LC,Ribeiro MO,Costa GM,Zawadzki CH,Prizon-Nakajima AC,Borin-Carvalho LA,Martins-Santos IC,Portela-Castro ALBdoi
10.3897/CompCytogen.v13i4.36205subject
Has Abstractpub_date
2019-12-11 00:00:00pages
411-422issue
4eissn
1993-0771issn
1993-078Xpii
36205journal_volume
13pub_type
杂志文章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::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...
journal_title:Comparative cytogenetics
pub_type: 杂志文章
doi:10.3897/CompCytogen.v8i1.5913
更新日期:2014-01-09 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::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::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::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::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 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::Agave Linnaeus, 1753 is endemic of America and is considered one of the most important crops in Mexico due to its key role in the country's economy. Cytogenetic analysis was carried out in Agave tequilana Weber, 1902 'Azul', Agave cupreata Trelease et Berger, 1915 and Agave angustifolia Haworth, 1812. The analysis sho...
journal_title:Comparative cytogenetics
pub_type: 杂志文章
doi:10.3897/CompCytogen.v7i3.5337
更新日期:2013-08-12 00:00:00
abstract::We describe the karyotype, location of nucleolus-organizing regions (NORs) and heterochromatin composition and distribution in Lepidochitona caprearum (Scacchi, 1836). The examined specimens had 2n=24 chromosomes; the elements of pairs 1-4 were metacentric, subtelocentric those of the fifth pair, telocentric the eleme...
journal_title:Comparative cytogenetics
pub_type: 杂志文章
doi:10.3897/CompCytogen.v6i4.3722
更新日期:2012-12-12 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::Next-generation sequencing data analysis on Triatoma infestans Klug, 1834 (Heteroptera, Cimicomorpha, Reduviidae) revealed the presence of the ancestral insect (TTAGG)n telomeric motif in its genome. Fluorescence in situ hybridization confirms that chromosomes bear this telomeric sequence in their chromosomal ends. Fu...
journal_title:Comparative cytogenetics
pub_type: 杂志文章
doi:10.3897/CompCytogen.v10i3.9960
更新日期:2016-09-13 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::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::Parallel trends of chromosomal evolution in Aphidococca are discussed, based on the catalogue of chromosomal numbers and genetic systems of scale insects by Gavrilov (2007) and the new catalogue for aphids provided in the present paper. To date chromosome numbers have been reported for 482 species of scale insects and...
journal_title:Comparative cytogenetics
pub_type: 杂志文章
doi:10.3897/CompCytogen.v9i3.4930
更新日期:2015-07-09 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 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
abstract::An extreme example of nonrandom rearrangements, especially inversion breaks, is described in the polytene chromosomes of the black fly Simulium bergi Rubtsov, 1956 from Armenia and Turkey. A total of 48 rearrangements was discovered, relative to the standard banding sequence for the subgenus Simulium Latreille, 1802. ...
journal_title:Comparative cytogenetics
pub_type: 杂志文章
doi:10.3897/CompCytogen.v10i2.8855
更新日期:2016-06-30 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::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::The ancient insect order Odonata is divided into three suborders: Anisoptera and Zygoptera with approximately 3000 species worldwide each, and Anisozygoptera with only four extant species in the relict family Epiophlebiidae. An updated list of Odonata species studied regarding chromosome number, sex chromosome mechani...
journal_title:Comparative cytogenetics
pub_type: 杂志文章,评审
doi:10.3897/CompCytogen.v14i4.57062
更新日期:2020-10-22 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::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::Drosophila melanogaster Meigen, 1830 has served as a model insect for over a century. Sequencing of the 11 additional Drosophila Fallen, 1823 species marks substantial progress in comparative genomics of this genus. By comparison, practically nothing is known about the genome size or genome sequences of parasitic wasp...
journal_title:Comparative cytogenetics
pub_type: 杂志文章
doi:10.3897/CompCytogen.v5i3.1435
更新日期:2011-08-24 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::The B chromosome in the hylid Hypsiboas albopunctatus (2n = 22 + B) is small, almost entirely composed of C-positive heterochromatin, and does not pair with any chromosome of the A complement. B probe, obtained by microdissection and DOP-PCR amplification, was used to search for homology between the B and regular chro...
journal_title:Comparative cytogenetics
pub_type: 杂志文章
doi:10.3897/CompCytogen.v8i3.7771
更新日期:2014-08-08 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::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::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::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