Integrative analysis of chromosome banding, telomere localization and molecular genetics in the highly variable Ctenomys of the Corrientes group (Rodentia; Ctenomyidae)
The genus Ctenomys comprises about 70 species with great chromosome diversity. The Corrientes group is one of the most chromosomally variable lineages in the genus, where the diploid number (2n) varies from 41 to 70. In this group, three nominal species and numerous polymorphic and polytypic populat...
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2018
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00166707_v146_n4-5_p403_Buschiazzo http://hdl.handle.net/20.500.12110/paper_00166707_v146_n4-5_p403_Buschiazzo |
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paper:paper_00166707_v146_n4-5_p403_Buschiazzo2023-06-08T14:38:33Z Integrative analysis of chromosome banding, telomere localization and molecular genetics in the highly variable Ctenomys of the Corrientes group (Rodentia; Ctenomyidae) Banding techniques Chromosome rearrangements Cytochrome b Rodents South America Telomeres cytochrome b animal chromosome chromosome analysis chromosome banding pattern genetic variation genetics karyotyping molecular evolution Octodon phylogeny procedures rodent telomere Animals Chromosome Banding Chromosomes, Mammalian Cytochromes b Cytogenetic Analysis Evolution, Molecular Genetic Variation Karyotyping Octodon Phylogeny Rodentia Telomere The genus Ctenomys comprises about 70 species with great chromosome diversity. The Corrientes group is one of the most chromosomally variable lineages in the genus, where the diploid number (2n) varies from 41 to 70. In this group, three nominal species and numerous polymorphic and polytypic populations have been described. In order to get insight into the chromosomal evolution of this species complex, we applied different banding and molecular cytogenetic techniques. The results were interpreted in an evolutionary context, based on mitochondrial cytochrome b analyses. Studied samples are representative of the broad chromosomal variability in the group, including specimens with 2n = 42 to 2n = 70. Heterochromatin was scarce but concentrated in a few chromosomes. Centromeric DAPI-negative heterochromatin was observed in some autosomal pairs, which differed among populations. Location and amount of DAPI-neutral heterochromatin within the Y chromosome varied among populations. The variable distribution of heterochromatin indicates its dynamic behavior. NORs were detected in one pair of autosomes, which also differed among some populations. Telomeric FISH signals were observed in all complements only at the chromosome ends. The Corrientes group belongs to a clade that also includes C. pearsoni, C. lami, C. minutus, C. ibicuiensis and C. torquatus. Almost all of these species are variable at the chromosomal level, suggesting that this is the ancestral condition of the clade. Within the Corrientes group, the observed low genetic divergence, in contrast with its high chromosomal variability, is indicative of decoupling between the rates of chromosomal and mitochondrial evolution. © 2018, Springer Nature Switzerland AG. 2018 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00166707_v146_n4-5_p403_Buschiazzo http://hdl.handle.net/20.500.12110/paper_00166707_v146_n4-5_p403_Buschiazzo |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Banding techniques Chromosome rearrangements Cytochrome b Rodents South America Telomeres cytochrome b animal chromosome chromosome analysis chromosome banding pattern genetic variation genetics karyotyping molecular evolution Octodon phylogeny procedures rodent telomere Animals Chromosome Banding Chromosomes, Mammalian Cytochromes b Cytogenetic Analysis Evolution, Molecular Genetic Variation Karyotyping Octodon Phylogeny Rodentia Telomere |
| spellingShingle |
Banding techniques Chromosome rearrangements Cytochrome b Rodents South America Telomeres cytochrome b animal chromosome chromosome analysis chromosome banding pattern genetic variation genetics karyotyping molecular evolution Octodon phylogeny procedures rodent telomere Animals Chromosome Banding Chromosomes, Mammalian Cytochromes b Cytogenetic Analysis Evolution, Molecular Genetic Variation Karyotyping Octodon Phylogeny Rodentia Telomere Integrative analysis of chromosome banding, telomere localization and molecular genetics in the highly variable Ctenomys of the Corrientes group (Rodentia; Ctenomyidae) |
| topic_facet |
Banding techniques Chromosome rearrangements Cytochrome b Rodents South America Telomeres cytochrome b animal chromosome chromosome analysis chromosome banding pattern genetic variation genetics karyotyping molecular evolution Octodon phylogeny procedures rodent telomere Animals Chromosome Banding Chromosomes, Mammalian Cytochromes b Cytogenetic Analysis Evolution, Molecular Genetic Variation Karyotyping Octodon Phylogeny Rodentia Telomere |
| description |
The genus Ctenomys comprises about 70 species with great chromosome diversity. The Corrientes group is one of the most chromosomally variable lineages in the genus, where the diploid number (2n) varies from 41 to 70. In this group, three nominal species and numerous polymorphic and polytypic populations have been described. In order to get insight into the chromosomal evolution of this species complex, we applied different banding and molecular cytogenetic techniques. The results were interpreted in an evolutionary context, based on mitochondrial cytochrome b analyses. Studied samples are representative of the broad chromosomal variability in the group, including specimens with 2n = 42 to 2n = 70. Heterochromatin was scarce but concentrated in a few chromosomes. Centromeric DAPI-negative heterochromatin was observed in some autosomal pairs, which differed among populations. Location and amount of DAPI-neutral heterochromatin within the Y chromosome varied among populations. The variable distribution of heterochromatin indicates its dynamic behavior. NORs were detected in one pair of autosomes, which also differed among some populations. Telomeric FISH signals were observed in all complements only at the chromosome ends. The Corrientes group belongs to a clade that also includes C. pearsoni, C. lami, C. minutus, C. ibicuiensis and C. torquatus. Almost all of these species are variable at the chromosomal level, suggesting that this is the ancestral condition of the clade. Within the Corrientes group, the observed low genetic divergence, in contrast with its high chromosomal variability, is indicative of decoupling between the rates of chromosomal and mitochondrial evolution. © 2018, Springer Nature Switzerland AG. |
| title |
Integrative analysis of chromosome banding, telomere localization and molecular genetics in the highly variable Ctenomys of the Corrientes group (Rodentia; Ctenomyidae) |
| title_short |
Integrative analysis of chromosome banding, telomere localization and molecular genetics in the highly variable Ctenomys of the Corrientes group (Rodentia; Ctenomyidae) |
| title_full |
Integrative analysis of chromosome banding, telomere localization and molecular genetics in the highly variable Ctenomys of the Corrientes group (Rodentia; Ctenomyidae) |
| title_fullStr |
Integrative analysis of chromosome banding, telomere localization and molecular genetics in the highly variable Ctenomys of the Corrientes group (Rodentia; Ctenomyidae) |
| title_full_unstemmed |
Integrative analysis of chromosome banding, telomere localization and molecular genetics in the highly variable Ctenomys of the Corrientes group (Rodentia; Ctenomyidae) |
| title_sort |
integrative analysis of chromosome banding, telomere localization and molecular genetics in the highly variable ctenomys of the corrientes group (rodentia; ctenomyidae) |
| publishDate |
2018 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00166707_v146_n4-5_p403_Buschiazzo http://hdl.handle.net/20.500.12110/paper_00166707_v146_n4-5_p403_Buschiazzo |
| _version_ |
1768543829933162496 |