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 approximately 34 million years before present (MYBP), and that between South American and Australian marsupials approximately 72 MYBP.
journal_name
J Mol Evoljournal_title
Journal of molecular evolutionauthors
Janke A,Magnell O,Wieczorek G,Westerman M,Arnason Udoi
10.1007/s00239-001-0019-8keywords:
subject
Has Abstractpub_date
2002-01-01 00:00:00pages
71-80issue
1eissn
0022-2844issn
1432-1432journal_volume
54pub_type
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