Heterochromatin differentiation shows the pathways of karyotypic evolution in Israeli mole rats (Spalax, Spalacidae, Rodentia)

2005 ◽  
Vol 111 (2) ◽  
pp. 159-165 ◽  
Author(s):  
E. Ivanitskaya ◽  
A. Belyayev ◽  
E. Nevo
Keyword(s):  
Karyotypic Evolution ◽  
Heterochromatin Differentiation

scholarly journals Genomic dispersion of 28S rDNA during karyotypic evolution in the ant genusMyrmecia (formicidae)

Chromosoma ◽  
1997 ◽  
Vol 105 (6) ◽  
pp. 380-381
Author(s):  
Hiroshisa Hirai ◽  
Masa-Toshi Yamamoto ◽  
Robert W. Taylor ◽  
Hirotami T. Imai
Keyword(s):  
28S Rdna ◽  
Karyotypic Evolution

Diversity and Karyotypic Evolution in the Genus Neacomys (Rodentia, Sigmodontinae)

2015 ◽  
Vol 146 (4) ◽  
pp. 296-305 ◽  
Author(s):  
Willam O. da Silva ◽  
Julio C. Pieczarka ◽  
Rogério V. Rossi ◽  
Horacio Schneider ◽  
Iracilda Sampaio ◽  
...  
Keyword(s):  
Molecular Phylogeny ◽  
Diploid Number ◽  
Constitutive Heterochromatin ◽  
Chromosomal Evolution ◽  
The Other ◽  
Karyotypic Evolution ◽  
Drastic Reduction ◽  
Ancestral Species ◽  
Pericentric Inversions ◽  
Amazonian Region

Neacomys (Sigmodontinae) comprises 8 species mainly found in the Amazonian region. We describe 5 new karyotypes from Brazilian Amazonia: 2 cytotypes for N. paracou (2n = 56/FNa = 62-66), 1 for N. dubosti (2n = 64/FNa = 68), and 2 for Neacomys sp. (2n = 58/FNa = 64-70), with differences in the 18S rDNA. Telomeric probes did not show ITS. We provide a phylogeny using Cytb, and the analysis suggests that 2n = 56 with a high FNa is ancestral for the genus, as found in N. paracou, being retained by the ancestral forms of the other species, with an increase in 2n occurring independently in N. spinosus and N. dubosti. Alternatively, an increase in 2n may have occurred in the ancestral taxon of the other species, followed by independent 2n-reduction events in Neacomys sp. and in the ancestral species of N. tenuipes, N. guianae, N. musseri, and N. minutus. Finally, a drastic reduction event in the diploid number occurred in the ancestral species of N. musseri and N. minutus which exhibit the lowest 2n of the genus. The karyotypic variations found in both intra- and interspecific samples, associated with the molecular phylogeny, suggest a chromosomal evolution with amplification/deletion of constitutive heterochromatin and rearrangements including fusions, fissions, and pericentric inversions.

Karyotypic Evolution in Neotropical Fishes

2007 ◽  
pp. 111-164 ◽  
Author(s):  
Claudio Oliveira ◽  
Lurdes Foresti de Almeida-Toledo ◽  
Fausto Foresti
Keyword(s):  
Karyotypic Evolution ◽  
Neotropical Fishes

scholarly journals Karyotypic evolution of the Medicago complex: sativa-caerulea-falcata inferred from comparative cytogenetic analysis

2017 ◽  
Vol 17 (1) ◽  
Author(s):  
Feng Yu ◽  
Haiqing Wang ◽  
Yanyan Zhao ◽  
Ruijuan Liu ◽  
Quanwen Dou ◽  
...  
Keyword(s):  
Cytogenetic Analysis ◽  
Karyotypic Evolution

scholarly journals Chromosome Mapping of Repetitive Sequences inRachycentron canadum(Perciformes: Rachycentridae): Implications for Karyotypic Evolution and Perspectives for Biotechnological Uses

2011 ◽  
Vol 2011 ◽  
pp. 1-8 ◽  
Author(s):  
Uedson Pereira Jacobina ◽  
Marcelo de Bello Cioffi ◽  
Luiz Gustavo Rodrigues Souza ◽  
Leonardo Luiz Calado ◽  
Manoel Tavares ◽  
...  
Keyword(s):  
Repetitive Sequences ◽  
Chromosome Mapping ◽  
Karyotypic Evolution ◽  
Dapi Staining ◽  
Telomeric Sequences ◽  
Replication Banding ◽  
The Family ◽  
Early Replication

The cobia,Rachycentron canadum, a species of marine fish, has been increasingly used in aquaculture worldwide. It is the only member of the family Rachycentridae (Perciformes) showing wide geographic distribution and phylogenetic patterns still not fully understood. In this study, the species was cytogenetically analyzed by different methodologies, including Ag-NOR and chromomycin A3(CMA3)/DAPI staining, C-banding, early replication banding (RGB), andin situfluorescent hybridization with probes for 18S and 5S ribosomal genes and for telomeric sequences (TTAGGG)n. The results obtained allow a detailed chromosomal characterization of the Atlantic population. The chromosome diversification found in the karyotype of the cobia is apparently related to pericentric inversions, the main mechanism associated to the karyotypic evolution of Perciformes. The differential heterochromatin replication patterns found were in part associated to functional genes. Despite maintaining conservative chromosomal characteristics in relation to the basal pattern established for Perciformes, some chromosome pairs in the analyzed population exhibit markers that may be important for cytotaxonomic, population, and biodiversity studies as well as for monitoring the species in question.

A STUDY ON KARYOTYPIC EVOLUTION OF THE GENUS SPALAXGÜLDENSTAEDT, 1770 (MAMMALIA: RODENTIA) IN TURKEY

2000 ◽  
Vol 46 (3) ◽  
pp. 239-242
Author(s):  
MUSTAFA SÖZEN ◽  
NURI YIGIT ◽  
ERCÜMENT ÇOLAK
Keyword(s):  
Karyotypic Evolution
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