Chromosome Banding in Amphibia. XXXII. The Genus Xenopus (Anura, Pipidae)
Zitieren Sie bitte immer diese URN: urn:nbn:de:bvb:20-opus-196727
- Mitotic chromosomes of 16 species of the frog genus Xenopus were prepared from kidney and lung cell cultures. In the chromosomes of 7 species, high-resolution replication banding patterns could be induced by treating the cultures with 5-bromodeoxyuridine (BrdU) and deoxythymidine (dT) in succession, and in 6 of these species the BrdU/dT-banded chromosomes could be arranged into karyotypes. In the 3 species of the clade with 2n = 20 and 4n = 40 chromosomes (X. tropicalis, X. epitropicalis, X. new tetraploid 1), as well as in the 3 species withMitotic chromosomes of 16 species of the frog genus Xenopus were prepared from kidney and lung cell cultures. In the chromosomes of 7 species, high-resolution replication banding patterns could be induced by treating the cultures with 5-bromodeoxyuridine (BrdU) and deoxythymidine (dT) in succession, and in 6 of these species the BrdU/dT-banded chromosomes could be arranged into karyotypes. In the 3 species of the clade with 2n = 20 and 4n = 40 chromosomes (X. tropicalis, X. epitropicalis, X. new tetraploid 1), as well as in the 3 species with 4n = 36 chromosomes (X. laevis, X. borealis, X. muelleri), the BrdU/dT-banded karyotypes show a high degree of homoeology, though differences were detected between these groups. Translocations, inversions, insertions or sex-specific replication bands were not observed. Minor replication asynchronies found between chromosomes probably involve heterochromatic regions. BrdU/dT replication banding of Xenopus chromosomes provides the landmarks necessary for the exact physical mapping of genes and repetitive sequences. FISH with an X. laevis 5S rDNA probe detected multiple hybridization sites at or near the long-arm telomeric regions in most chromosomes of X. laevis and X. borealis, whereas in X. muelleri, the 5S rDNA sequences are located exclusively at the long-arm telomeres of a single chromosome pair. Staining with the AT base pair-specific fluorochrome quinacrine mustard revealed brightly fluorescing heterochromatic regions in the majority of X. borealis chromosomes which are absent in other Xenopus species.…
Autor(en): | Michael Schmid, Claus Steinlein |
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URN: | urn:nbn:de:bvb:20-opus-196727 |
Dokumentart: | Artikel / Aufsatz in einer Zeitschrift |
Institute der Universität: | Medizinische Fakultät / Institut für Humangenetik |
Sprache der Veröffentlichung: | Englisch |
Titel des übergeordneten Werkes / der Zeitschrift (Englisch): | Cytogenetic and Genome Research |
ISSN: | 1424-8581 |
ISSN: | 1424-859X |
Erscheinungsjahr: | 2015 |
Band / Jahrgang: | 145 |
Heft / Ausgabe: | 3-4 |
Seitenangabe: | 201-217 |
Originalveröffentlichung / Quelle: | Cytogenetic and Genome Research 2015;145(3-4):201–217. DOI: 10.1159/000433481 |
DOI: | https://doi.org/10.1159/000433481 |
PubMed-ID: | https://pubmed.ncbi.nlm.nih.gov/26112092 |
Allgemeine fachliche Zuordnung (DDC-Klassifikation): | 6 Technik, Medizin, angewandte Wissenschaften / 61 Medizin und Gesundheit / 610 Medizin und Gesundheit |
Freie Schlagwort(e): | BrdU/dT replication banding; FISH; X. laevis-type karyotype; X. tropicalis-type karyotype; Xenopus; chromosome staining; polyploidy |
Datum der Freischaltung: | 20.08.2021 |
Datum der Erstveröffentlichung: | 25.06.2015 |
Anmerkungen: | This publication is with permission of the rights owner freely accessible due to an Alliance licence and a national licence (funded by the DFG, German Research Foundation) respectively. |
Lizenz (Deutsch): | Deutsches Urheberrecht |