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Phylogenetic analysis of 18S rRNA and the mitochondrial genomes of the wombat, Vombatus ursinus, and the spiny anteater, Tachyglossus aculeatus: Increased support for the Marsupionta hypothesis

Janke, Axel LU ; Magnell, Ola LU ; Wieczorek, G; Westerman, M and Arnason, Ulfur LU (2002) In Journal of Molecular Evolution 54(1). p.71-80
Abstract
The monotremes, the duck-billed platypus and the echidnas, are characterized by a number of unique morphological characteristics, which have led to the common belief that they represent the living survivors of an ancestral stock of mammals. Analysis of new data from the complete mitochondrial (mt) genomes of a second monotreme, the spiny anteater. and another marsupial, the wombat. yielded clear support for the Marsupionta hypothesis. According to this hypothesis marsupials are more closely related to monotremes than to eutherians, consistent with a basal split between eutherians and marsupials/monotremes among extant mammals. This finding was also supported by analysis of new sequences from a nuclear gene-18S rRNA. The mt genome of the... (More)
The monotremes, the duck-billed platypus and the echidnas, are characterized by a number of unique morphological characteristics, which have led to the common belief that they represent the living survivors of an ancestral stock of mammals. Analysis of new data from the complete mitochondrial (mt) genomes of a second monotreme, the spiny anteater. and another marsupial, the wombat. yielded clear support for the Marsupionta hypothesis. According to this hypothesis marsupials are more closely related to monotremes than to eutherians, consistent with a basal split between eutherians and marsupials/monotremes among extant mammals. This finding was also supported by analysis of new sequences from a nuclear gene-18S rRNA. The mt genome of the wombat shares some unique features with previously described marsupial mtDNAs (tRNA rearrangement, a missing tRNA(Lys), and evidence for RNA editing of the tRNA(Asp)). Molecular estimates of genetic divergence suggest that the divergence between the platypus and the spiny anteater took place approximate to 34 million years before present (MYBP), and that between South American and Australian marsupials approximate to 72 MYBP. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
spiny anteater, Theria, phylogenetics, Marsupionta, wombat, mitochondrial DNA, 18S rDNA
in
Journal of Molecular Evolution
volume
54
issue
1
pages
71 - 80
publisher
Springer
external identifiers
  • pmid:11734900
  • wos:000172518200009
  • scopus:0036133006
ISSN
0022-2844
DOI
10.1007/s00239-001-0019-8
language
English
LU publication?
yes
id
519d0a4a-67a3-4c85-bbb7-3cdd8eab4621 (old id 348559)
date added to LUP
2007-10-24 13:21:51
date last changed
2017-05-28 03:35:03
@article{519d0a4a-67a3-4c85-bbb7-3cdd8eab4621,
  abstract     = {The monotremes, the duck-billed platypus and the echidnas, are characterized by a number of unique morphological characteristics, which have led to the common belief that they represent the living survivors of an ancestral stock of mammals. Analysis of new data from the complete mitochondrial (mt) genomes of a second monotreme, the spiny anteater. and another marsupial, the wombat. yielded clear support for the Marsupionta hypothesis. According to this hypothesis marsupials are more closely related to monotremes than to eutherians, consistent with a basal split between eutherians and marsupials/monotremes among extant mammals. This finding was also supported by analysis of new sequences from a nuclear gene-18S rRNA. The mt genome of the wombat shares some unique features with previously described marsupial mtDNAs (tRNA rearrangement, a missing tRNA(Lys), and evidence for RNA editing of the tRNA(Asp)). Molecular estimates of genetic divergence suggest that the divergence between the platypus and the spiny anteater took place approximate to 34 million years before present (MYBP), and that between South American and Australian marsupials approximate to 72 MYBP.},
  author       = {Janke, Axel and Magnell, Ola and Wieczorek, G and Westerman, M and Arnason, Ulfur},
  issn         = {0022-2844},
  keyword      = {spiny anteater,Theria,phylogenetics,Marsupionta,wombat,mitochondrial DNA,18S rDNA},
  language     = {eng},
  number       = {1},
  pages        = {71--80},
  publisher    = {Springer},
  series       = {Journal of Molecular Evolution},
  title        = {Phylogenetic analysis of 18S rRNA and the mitochondrial genomes of the wombat, Vombatus ursinus, and the spiny anteater, Tachyglossus aculeatus: Increased support for the Marsupionta hypothesis},
  url          = {http://dx.doi.org/10.1007/s00239-001-0019-8},
  volume       = {54},
  year         = {2002},
}