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Radiation of extant marsupials after the K/T boundary: evidence from complete mitochondrial genomes
- Source :
- Journal of molecular evolution. 57
- Publication Year :
- 2004
-
Abstract
- The complete mitochondrial (mt) genomes of five marsupial species have been sequenced. The species represent all three South American orders (Didelphimorphia, Paucituberculata, and Microbiotheria). Phylogenetic analysis of this data set indicates that Didelphimorphia is a basal marsupial lineage followed by Paucituberculata. The South American microbiotherid Dromiciops gliroides (monito del monte) groups with Australian marsupials, suggesting a marsupial colonization of Australia on two occasions or, alternatively, a migration of an Australian marsupial lineage to South America. Molecular estimates suggest that the deepest marsupial divergences took place 64-62 million years before present (MYBP), implying that the radiation of recent marsupials took place after the K/T (Cretaceous/Tertiary) boundary. The South American marsupial lineages are all characterized by a putatively non-functional tRNA for lysine, a potential RNA editing of the tRNA for asparagine, and a rearrangement of tRNA genes at the origin of light strand replication.
- Subjects :
- Lineage (evolution)
Molecular Sequence Data
royalty.order_of_chivalry
Zoology
royalty
DNA, Mitochondrial
Thylamys
Evolution, Molecular
Paucituberculata
Phylogenetics
Genetics
Animals
Molecular Biology
Ecology, Evolution, Behavior and Systematics
Microbiotheria
Phylogeny
Marsupial
RNA, Transfer, Asp
Genome
biology
Base Sequence
Fossils
Australia
Sequence Analysis, DNA
Cytochromes b
South America
biology.organism_classification
Biological Evolution
Marsupialia
RNA, Transfer, Lys
Australidelphia
Monito del monte
Subjects
Details
- ISSN :
- 00222844
- Volume :
- 57
- Database :
- OpenAIRE
- Journal :
- Journal of molecular evolution
- Accession number :
- edsair.doi.dedup.....fad41a68ede9e94882e3515cee871678