scholarly journals Description of the karyotype of Sphyracephala detrahens (Diptera, Diopsidae)

2019 ◽  
Vol 13 (4) ◽  
pp. 383-388
Author(s):  
Ayumi Kudo
Keyword(s):  
Sex Chromosomes ◽  
Cytogenetic Analysis ◽  
Diploid Number ◽  
Chromosome Rearrangements ◽  
Giemsa Staining ◽  
Evolutionary Origin ◽  
Extant Genus ◽  
Telocentric Chromosomes ◽  
Basal Branch

The eye stalks in Diopsidae (Bilberg, 1820) have been widely examined, but the evolutionary origin of this unique trait remains unclear. Thus, further studies of Sphiracephala (Say, 1828), the extant genus forming a basal branch of Diopsinae, are needed. The present study aimed to identify the karyotype of Sphyracephala detrahens (Walker, 1860) with conventional Giemsa staining. Cytogenetic analysis revealed a diploid number of 2n = 10 including two pairs of metacentric chromosomes, a pair of telocentric chromosomes, a pair of dot-like chromosomes, and a pair of sex chromosomes in S. detrahens. The congener Sphyracephala brevicornis (Say, 1817) has been reported to have the same diploid number, 2n = 10, but different chromosome formula. These results demonstrate that chromosome rearrangements often occur in the genus Sphyracephala.

Karyology of the Indo-Pacific Parioglossus raoi (Herre) (Teleosstei : Gobioidei) from Fiji

1986 ◽  
Vol 37 (3) ◽  
pp. 347 ◽  
Author(s):  
CJ Webb
Keyword(s):  
Sex Chromosomes ◽  
Meiotic Division ◽  
Diploid Number ◽  
Telocentric Chromosomes

The diploid number of chromosomes from gills, spleen and gonads of Fijian specimens of P. raoi was 46, 23 bivalents being observed during the meiotic division in spermatocytes. The karyotype comprised 23 pairs of telocentric chromosomes, giving an arm number of 46. There was no evidence for morphologically identifiable sex chromosomes. Comparisons with other gobioids indicate that the karyotype of P. raoi is superficially similar to those of a number of taxonomically diverse members of the suborder and bears no special resemblance to species from a similar ecotope.

SINE-B1 Distribution and Chromosome Rearrangements in the South American Proechimys gr. goeldii (Echimyidae, Rodentia)

2021 ◽  
pp. 1-8
Author(s):  
Naiara P. Araújo ◽  
Radarane S. Sena ◽  
Cibele R. Bonvicino ◽  
Gustavo C.S. Kuhn ◽  
Marta Svartman
Keyword(s):  
Transposable Element ◽  
Genome Evolution ◽  
Significant Role ◽  
Sex Chromosomes ◽  
Chromosomal Rearrangements ◽  
Evolutionary Relationship ◽  
Chromosome Rearrangements ◽  
South American ◽  
Gross Chromosomal Rearrangements

<i>Proechimys</i> species are remarkable for their extensive chromosome rearrangements, representing a good model to understand genome evolution. Herein, we cytogenetically analyzed 3 different cytotypes of <i>Proechimys</i> gr. <i>goeldii</i> to assess their evolutionary relationship. We also mapped the transposable element SINE-B1 on the chromosomes of <i>P.</i> gr. <i>goeldii</i> in order to investigate its distribution among individuals and evaluate its possible contribution to karyotype remodeling in this species. SINE-B1 showed a dispersed distribution along chromosome arms and was also detected at the pericentromeric regions of some chromosomes, including pair 1 and the sex chromosomes, which are involved in chromosome rearrangements. In addition, we describe a new cytotype for <i>P.</i> gr. <i>goeldii</i>, reinforcing the significant role of gross chromosomal rearrangements during the evolution of the genus. The results of FISH with SINE-B1 suggest that this issue should be more deeply investigated for a better understanding of its role in the mechanisms involved in the wide variety of <i>Proechimys</i> karyotypes.

Genetic and cytogenetic analysis of the fruit fly Rhagoletis cerasi (Diptera: Tephritidae)

Genome ◽  
2008 ◽  
Vol 51 (7) ◽  
pp. 479-491 ◽  
Author(s):  
Ilias Kounatidis ◽  
Nikolaos Papadopoulos ◽  
Kostas Bourtzis ◽  
Penelope Mavragani-Tsipidou
Keyword(s):  
Salivary Gland ◽  
Sex Chromosomes ◽  
Cytogenetic Analysis ◽  
Polytene Chromosomes ◽  
Fruit Fly ◽  
Pest Species ◽  
Heteromorphic Sex Chromosomes ◽  
Weak Points ◽  
Heterogametic Sex ◽  
Rhagoletis Cerasi

The European cherry fruit fly, Rhagoletis cerasi , is a major agricultural pest for which biological, genetic, and cytogenetic information is limited. We report here a cytogenetic analysis of 4 natural Greek populations of R. cerasi, all of them infected with the endosymbiotic bacterium Wolbachia pipientis . The mitotic karyotype and detailed photographic maps of the salivary gland polytene chromosomes of this pest species are presented here. The mitotic metaphase complement consists of 6 pairs of chromosomes, including one pair of heteromorphic sex chromosomes, with the male being the heterogametic sex. The analysis of the salivary gland polytene complement has shown a total of 5 long chromosomes (10 polytene arms) that correspond to the 5 autosomes of the mitotic nuclei and a heterochromatic mass corresponding to the sex chromosomes. The most prominent landmarks of each polytene chromosome, the “weak points”, and the unusual asynapsis of homologous pairs of polytene chromosomes at certain regions of the polytene elements are also presented and discussed.

scholarly journals A new sympatric region for distinct karyotypic forms of Hoplias malabaricus (Pisces, Erythrinidae)

2006 ◽  
Vol 66 (1b) ◽  
pp. 205-210 ◽  
Author(s):  
G. G. Born ◽  
L. A. C. Bertollo
Keyword(s):  
Sex Difference ◽  
Sex Chromosomes ◽  
Diploid Number ◽  
Sex Chromosome ◽  
Minas Gerais ◽  
Female Specimen ◽  
Male Specimen ◽  
Hoplias Malabaricus ◽  
Sex Chromosome System ◽  
Sympatric Cytotypes

Specimens of Hoplias malabaricus from Lagoa Carioca, an isolated lake of the Rio Doce State Park (state of Minas Gerais, Brazil), were cytogenetically studied. The diploid number was found to be constant, i.e., 2n = 42 chromosomes, although two karyotypic forms were found: karyotype A, characterized by 22M + 20SM chromosomes, observed only in a male specimen, and karyotype B, characterized by 24M + 16SM + 2ST and 24M + 17SM + 1ST chromosomes in female and male specimens, respectively. This sex difference found in karyotype B is related to an XX/XY sex chromosome system. Another female specimen of H. malabaricus, also carrying karyotype A, had previously been found in the same lake. The available data indicate that two sympatric cytotypes of H. malabaricus exist in the Lagoa Carioca, with cytotype A occurring at a lower frequency and differing from cytotype B by undifferentiated sex chromosomes.

KARYOLOGICAL RELATIONSHIPS IN TURTLES (REPTILIA: CHELONIA)

1972 ◽  
Vol 14 (4) ◽  
pp. 859-868 ◽  
Author(s):  
A. Dean Stock
Keyword(s):  
Chromosome Number ◽  
Sex Chromosomes ◽  
Mitotic Chromosomes ◽  
Meiotic Chromosomes ◽  
Telocentric Chromosomes ◽  
Chromosome Karyotype

The mitotic chromosomes of 33 species of chelonians representing 22 genera and six families were investigated. Chromosome number and morphology are the same for most members of a given family and range from 66 in Trionyx to 34 in Pelomedusa. Most emydid genera have 50 chromosomes. The karyotype of Chelydra (2n = 52) is similar to those of some testudinid and emydid genera and is unlike the 56 chromosome karyotype of kinosternid turtles. The three genera of tortoises examined, Gopherus, Testudo, and Geochelone, have 52 chromosomes, but Gopherus differs in karyotypic details. The karyotype of Geochelone is like that of Chelydra and the 52 chromosome genera of emydid turtles. The African pleurodiran Pelomedusa has three additional pairs of small acrocentric or telocentric chromosomes not present in the earlier described karyotype of Podocnemis. Examination of meiotic chromosomes revealed frequencies of chiasmata formation similar to those reported earlier. Sex chromosomes were not distinguishable.

scholarly journals A comprehensive molecular cytogenetic analysis of chromosome rearrangements in gibbons

2012 ◽  
Vol 22 (12) ◽  
pp. 2520-2528 ◽  
Author(s):  
O. Capozzi ◽  
L. Carbone ◽  
R. R. Stanyon ◽  
A. Marra ◽  
F. Yang ◽  
...  
Keyword(s):  
Cytogenetic Analysis ◽  
Chromosome Rearrangements ◽  
Molecular Cytogenetic

scholarly journals KARYOTYPIC ANALYSIS OF CHROMOSOMAL POLYMORPHISM IN RELATION TO REPRODUCTIVE FAILURE

2017 ◽  
Vol 9 (4) ◽  
pp. 140
Author(s):  
Ketan K. Vaghasia ◽  
Nidhi D. Shah ◽  
Parth S. Shah ◽  
Vidhi M. Bhatt ◽  
Sandip C. Shah ◽  
...  
Keyword(s):  
Genetic Counseling ◽  
Cytogenetic Analysis ◽  
Reproductive Function ◽  
Chromosomal Polymorphism ◽  
Giemsa Staining ◽  
Karyotypic Analysis ◽  
Blood Samples ◽  
Molecular Studies ◽  
Acrocentric Chromosomes

Objective: This study was undertaken to elucidate the role of heteromorphism in causation of reproductive anomalies like infertility.Methods: In our study, cytogenetic analysis of 830 suspected referral cases of both sexes were assessed using standard karyotypic technique with Giemsa staining from their blood samples. We identified heteromorphism of D/G groups and non-acrocentric chromosomes following WHO nomenclature.Results: Our data revealed that most of our heteromorphic cases (38;4.58%) were related to p arm satellites (ps+) of the chromosomes and are related to infertility and abortion. No significant gender variation was noticed in this study.Conclusion: We hence, suggest that heteromorphism is associated with a loss of reproductive function, as heterochromatin may contain genes that regulate cellular roles in reproduction. Further, it becomes important that such cases are considered for molecular studies, genetic counseling and prenatal/pre-implantation screening.

scholarly journals Determination of somatic and sex chromosomes of three Egyptian birds species using cytogenetic analysis

Genetika ◽  
2017 ◽  
Vol 49 (1) ◽  
pp. 285-295 ◽  
Author(s):  
A.H. Abu-Almaaty
Keyword(s):  
Sex Chromosomes ◽  
Chromosome Numbers ◽  
Related Species ◽  
Cytogenetic Analysis ◽  
Morphometric Measurement ◽  
Evolutionary Patterns ◽  
Taxonomic Relationships ◽  
Corvus Ruficollis

Study of karyotypes has been revealing important information on the taxonomic relationships and evolutionary patterns in various groups of birds. Karyotypes analysis and morphometric measurement of the chromosomes of three birds species of Geopelia cuneata (Columbiformes), Oriolus oriolus and Corvus ruficollis (Passeriformes) and their karyological have been studied. The diploid chromosome numbers of three species were, 2n=72, 2n=80 and 2n =80 respectively. The karyotypes of three species were different. The somatic and sex chromosomes and karyotypes of three species discussed and compared with other related species in the present study.

Sign in / Sign up

Export Citation Format

Share Document