scholarly journals Cytogenetical studies on the Japanese raccoon dog. VIII. B-chromosomes observed in the spermatogonial metaphase cells.

1985 ◽  
Vol 61 (8) ◽  
pp. 375-378 ◽  
Author(s):  
Tosihide H. YOSIDA ◽  
Masayasu Y. WADA
Keyword(s):  
B Chromosomes ◽  
Raccoon Dog ◽  
Spermatogonial Metaphase

scholarly journals Sequencing of Supernumerary Chromosomes of Red Fox and Raccoon Dog Confirms a Non-Random Gene Acquisition by B Chromosomes

Genes ◽  
2018 ◽  
Vol 9 (8) ◽  
pp. 405 ◽  
Author(s):  
Alexey Makunin ◽  
Svetlana Romanenko ◽  
Violetta Beklemisheva ◽  
Polina Perelman ◽  
Anna Druzhkova ◽  
...  
Keyword(s):  
Cell Cycle ◽  
Red Fox ◽  
B Chromosome ◽  
Mendelian Inheritance ◽  
B Chromosomes ◽  
Nyctereutes Procyonoides ◽  
Segmental Duplications ◽  
Raccoon Dog ◽  
Gene Acquisition ◽  
Genomic Regions

B chromosomes (Bs) represent a variable addition to the main karyotype in some lineages of animals and plants. Bs accumulate through non-Mendelian inheritance and become widespread in populations. Despite the presence of multiple genes, most Bs lack specific phenotypic effects, although their influence on host genome epigenetic status and gene expression are recorded. Previously, using sequencing of isolated Bs of ruminants and rodents, we demonstrated that Bs originate as segmental duplications of specific genomic regions, and subsequently experience pseudogenization and repeat accumulation. Here, we used a similar approach to characterize Bs of the red fox (Vulpes vulpes L.) and the Chinese raccoon dog (Nyctereutes procyonoides procyonoides Gray). We confirm the previous findings of the KIT gene on Bs of both species, but demostrate an independent origin of Bs in these species, with two reused regions. Comparison of gene ensembles in Bs of canids, ruminants, and rodents once again indicates enrichment with cell-cycle genes, development-related genes, and genes functioning in the neuron synapse. The presence of B-chromosomal copies of genes involved in cell-cycle regulation and tissue differentiation may indicate importance of these genes for B chromosome establishment.

Three-Dimensional Positioning of B Chromosomes in Fibroblast Nuclei of the Red Fox and the Chinese Raccoon Dog

2013 ◽  
Vol 139 (4) ◽  
pp. 243-249 ◽  
Author(s):  
B. Kociucka ◽  
J. Sosnowski ◽  
A. Kubiak ◽  
A. Nowak ◽  
P. Pawlak ◽  
...  
Keyword(s):  
Red Fox ◽  
Three Dimensional ◽  
B Chromosomes ◽  
Raccoon Dog

scholarly journals The Polymorphism of Cytogenetic Markers in the Farm and Wild-Living Raccoon Dog (Nyctereutes Procyonoides) / Polimorfizm Markerów Cytogenetycznych U Jenota (Nyctereutes Procyonoides) W Populacjach Hodowlanych I Dziko Żyjących

2013 ◽  
Vol 13 (4) ◽  
pp. 701-713 ◽  
Author(s):  
Monika Bugno-Poniewierska ◽  
Mariusz Wroński ◽  
Leszek Potocki ◽  
Klaudia Pawlina ◽  
Maciej Wnuk ◽  
...  
Keyword(s):  
Mammalian Species ◽  
Molecular Cytogenetics ◽  
Nucleolar Organizer ◽  
Variable Number ◽  
B Chromosomes ◽  
Farm Animals ◽  
Nucleolar Organizer Regions ◽  
Nyctereutes Procyonoides ◽  
Raccoon Dog ◽  
Basic Set

Abstract The raccoon dog (Nyctereutes procyonoides) is a mammalian species that belongs to Canidae family, order Carnivora. This species represents both animals living in the wild and farm animals used in the fur industry. Raccoon dogs have the most ‘primitive’ karyotype among Canidae family. The Chinese raccoon dog (Nyctereutes procyonoides procyonoides) is characterised by a variable number of chromosomes (2n = 54 + 0-4 B). B chromosomes are supernumerary chromosomes occurring in addition to the basic set of A chromosomes in the cells of many organisms. The function and origin of these additional chromosomes is not clear. The aim of this work was to determine possible karyotypic differences between wild-living and farm populations, using methods of classical and molecular cytogenetics. The most useful cytogenetic markers to analyse karyotype polymorphism of canine are the number of B chromosomes and nucleolar organizer regions. A variation was identified in the number of B chromosomes and nucleolar organizer regions (NORs) in cells between wild-living and breeding populations.

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