Cytogenetics of collared lemmings (Dicrostonyx groenlandicus) I. Meiotic behavior and evolution of the neo-XY sex-chromosome system
Electron-microscopic analysis of surface-spread synaptonemal complexes at pachynema and light-microscopic analysis of chromosomal configurations at diakinesis/metaphase I corroborate the hypothesized neo-XY derivation of the sex chromosomes of Dicrostonyx groenlandicus. Although an intact neo-XY pai...
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Language: | English |
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1997
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Online Access: | http://dx.doi.org/10.1159/000134746 https://www.karger.com/Article/Pdf/134746 |
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crskarger:10.1159/000134746 2024-06-16T07:39:36+00:00 Cytogenetics of collared lemmings (Dicrostonyx groenlandicus) I. Meiotic behavior and evolution of the neo-XY sex-chromosome system Berend, S.A. Hale, D.W. Engstrom, M.D. Greenbaum, I.F. 1997 http://dx.doi.org/10.1159/000134746 https://www.karger.com/Article/Pdf/134746 en eng S. Karger AG https://www.karger.com/Services/SiteLicenses https://www.karger.com/Services/SiteLicenses Cytogenetic and Genome Research volume 79, issue 3-4, page 288-292 ISSN 1424-8581 1424-859X journal-article 1997 crskarger https://doi.org/10.1159/000134746 2024-05-22T13:00:43Z Electron-microscopic analysis of surface-spread synaptonemal complexes at pachynema and light-microscopic analysis of chromosomal configurations at diakinesis/metaphase I corroborate the hypothesized neo-XY derivation of the sex chromosomes of Dicrostonyx groenlandicus. Although an intact neo-XY pairing configuration was observed in a relatively small percentage of the pachytene cells in each individual, the high incidence of neo-XY bivalents at diakinesis/metaphase I suggests that the other observed pachytene configurations were artifacts of the physical stresses of the surface-spreading procedure. The very low frequency (0.6 %) of univalent neo-X and neo-Y chromosomes at diakinesis and metaphase I is attributable to consistent synapsis and recombination between their homologous autosomally derived segments. The resultant stability of the sex bivalent through metaphase I may have increased the efficacy of sex-chromosome segregation, and thereby played a mechanistic role in the evolutionary incorporation of the neo-XY sex-chromosome constitution in D. groenlαndicus. Article in Journal/Newspaper Dicrostonyx groenlandicus Karger Cytogenetic and Genome Research 79 3-4 288 292 |
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English |
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Electron-microscopic analysis of surface-spread synaptonemal complexes at pachynema and light-microscopic analysis of chromosomal configurations at diakinesis/metaphase I corroborate the hypothesized neo-XY derivation of the sex chromosomes of Dicrostonyx groenlandicus. Although an intact neo-XY pairing configuration was observed in a relatively small percentage of the pachytene cells in each individual, the high incidence of neo-XY bivalents at diakinesis/metaphase I suggests that the other observed pachytene configurations were artifacts of the physical stresses of the surface-spreading procedure. The very low frequency (0.6 %) of univalent neo-X and neo-Y chromosomes at diakinesis and metaphase I is attributable to consistent synapsis and recombination between their homologous autosomally derived segments. The resultant stability of the sex bivalent through metaphase I may have increased the efficacy of sex-chromosome segregation, and thereby played a mechanistic role in the evolutionary incorporation of the neo-XY sex-chromosome constitution in D. groenlαndicus. |
format |
Article in Journal/Newspaper |
author |
Berend, S.A. Hale, D.W. Engstrom, M.D. Greenbaum, I.F. |
spellingShingle |
Berend, S.A. Hale, D.W. Engstrom, M.D. Greenbaum, I.F. Cytogenetics of collared lemmings (Dicrostonyx groenlandicus) I. Meiotic behavior and evolution of the neo-XY sex-chromosome system |
author_facet |
Berend, S.A. Hale, D.W. Engstrom, M.D. Greenbaum, I.F. |
author_sort |
Berend, S.A. |
title |
Cytogenetics of collared lemmings (Dicrostonyx groenlandicus) I. Meiotic behavior and evolution of the neo-XY sex-chromosome system |
title_short |
Cytogenetics of collared lemmings (Dicrostonyx groenlandicus) I. Meiotic behavior and evolution of the neo-XY sex-chromosome system |
title_full |
Cytogenetics of collared lemmings (Dicrostonyx groenlandicus) I. Meiotic behavior and evolution of the neo-XY sex-chromosome system |
title_fullStr |
Cytogenetics of collared lemmings (Dicrostonyx groenlandicus) I. Meiotic behavior and evolution of the neo-XY sex-chromosome system |
title_full_unstemmed |
Cytogenetics of collared lemmings (Dicrostonyx groenlandicus) I. Meiotic behavior and evolution of the neo-XY sex-chromosome system |
title_sort |
cytogenetics of collared lemmings (dicrostonyx groenlandicus) i. meiotic behavior and evolution of the neo-xy sex-chromosome system |
publisher |
S. Karger AG |
publishDate |
1997 |
url |
http://dx.doi.org/10.1159/000134746 https://www.karger.com/Article/Pdf/134746 |
genre |
Dicrostonyx groenlandicus |
genre_facet |
Dicrostonyx groenlandicus |
op_source |
Cytogenetic and Genome Research volume 79, issue 3-4, page 288-292 ISSN 1424-8581 1424-859X |
op_rights |
https://www.karger.com/Services/SiteLicenses https://www.karger.com/Services/SiteLicenses |
op_doi |
https://doi.org/10.1159/000134746 |
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Cytogenetic and Genome Research |
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79 |
container_issue |
3-4 |
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288 |
op_container_end_page |
292 |
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1802006364404318208 |