The Ancestral Eutherian Karyotype Is Present in Xenarthra
Molecular studies have led recently to the proposal of a new super-ordinal arrangement of the 18 extant Eutherian orders. From the four proposed super-orders, Afrotheria and Xenarthra were considered the most basal. Chromosome-painting studies with human probes in these two mammalian groups are thus...
| Main Authors: | , , |
|---|---|
| Format: | Online |
| Language: | English |
| Published: |
Public Library of Science
2006
|
| Online Access: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1513266/ |
| id |
pubmed-1513266 |
|---|---|
| recordtype |
oai_dc |
| spelling |
pubmed-15132662006-07-21 The Ancestral Eutherian Karyotype Is Present in Xenarthra Svartman, Marta Stone, Gary Stanyon, Roscoe Research Article Molecular studies have led recently to the proposal of a new super-ordinal arrangement of the 18 extant Eutherian orders. From the four proposed super-orders, Afrotheria and Xenarthra were considered the most basal. Chromosome-painting studies with human probes in these two mammalian groups are thus key in the quest to establish the ancestral Eutherian karyotype. Although a reasonable amount of chromosome-painting data with human probes have already been obtained for Afrotheria, no Xenarthra species has been thoroughly analyzed with this approach. We hybridized human chromosome probes to metaphases of species (Dasypus novemcinctus, Tamandua tetradactyla, and Choloepus hoffmanii) representing three of the four Xenarthra families. Our data allowed us to review the current hypotheses for the ancestral Eutherian karyotype, which range from 2n = 44 to 2n = 48. One of the species studied, the two-toed sloth C. hoffmanii (2n = 50), showed a chromosome complement strikingly similar to the proposed 2n = 48 ancestral Eutherian karyotype, strongly reinforcing it. Public Library of Science 2006-07 2006-07-21 /pmc/articles/PMC1513266/ /pubmed/16848642 http://dx.doi.org/10.1371/journal.pgen.0020109 Text en This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose. https://creativecommons.org/publicdomain/zero/1.0/ This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration, which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose. |
| repository_type |
Open Access Journal |
| institution_category |
Foreign Institution |
| institution |
US National Center for Biotechnology Information |
| building |
NCBI PubMed |
| collection |
Online Access |
| language |
English |
| format |
Online |
| author |
Svartman, Marta Stone, Gary Stanyon, Roscoe |
| spellingShingle |
Svartman, Marta Stone, Gary Stanyon, Roscoe The Ancestral Eutherian Karyotype Is Present in Xenarthra |
| author_facet |
Svartman, Marta Stone, Gary Stanyon, Roscoe |
| author_sort |
Svartman, Marta |
| title |
The Ancestral Eutherian Karyotype Is Present in Xenarthra |
| title_short |
The Ancestral Eutherian Karyotype Is Present in Xenarthra |
| title_full |
The Ancestral Eutherian Karyotype Is Present in Xenarthra |
| title_fullStr |
The Ancestral Eutherian Karyotype Is Present in Xenarthra |
| title_full_unstemmed |
The Ancestral Eutherian Karyotype Is Present in Xenarthra |
| title_sort |
ancestral eutherian karyotype is present in xenarthra |
| description |
Molecular studies have led recently to the proposal of a new super-ordinal arrangement of the 18 extant Eutherian orders. From the four proposed super-orders, Afrotheria and Xenarthra were considered the most basal. Chromosome-painting studies with human probes in these two mammalian groups are thus key in the quest to establish the ancestral Eutherian karyotype. Although a reasonable amount of chromosome-painting data with human probes have already been obtained for Afrotheria, no Xenarthra species has been thoroughly analyzed with this approach. We hybridized human chromosome probes to metaphases of species (Dasypus novemcinctus, Tamandua tetradactyla, and Choloepus hoffmanii) representing three of the four Xenarthra families. Our data allowed us to review the current hypotheses for the ancestral Eutherian karyotype, which range from 2n = 44 to 2n = 48. One of the species studied, the two-toed sloth C. hoffmanii (2n = 50), showed a chromosome complement strikingly similar to the proposed 2n = 48 ancestral Eutherian karyotype, strongly reinforcing it. |
| publisher |
Public Library of Science |
| publishDate |
2006 |
| url |
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1513266/ |
| _version_ |
1611384735193366528 |