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MeSH Review

Xenarthra

 
 
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High impact information on Xenarthra

  • Analyses suggest a close relationship between elephants (representing Afrotheria) and armadillos (Xenarthra), and our timing of this splitting is coincident with the opening of the South Atlantic, a major vicariant event [1].
  • Molecular evolution of mammalian aquaporin-2: further evidence that elephant shrew and aardvark join the paenungulate clade [2].
  • Two segmental combinations (HSA 10q/17 and HSA 3/20) unite the aardvark and elephant-shrews as sister taxa [3].
  • In roots and stems of C. edentata, Ft-1 transcripts are undetectable [4].
  • Statistical tests that employed APOB to examine a priori hypotheses for the root of the placental tree rejected rooting on myomorphs and hedgehog, but did not discriminate between rooting at the base of Afrotheria, at the base of Xenarthra, or between Atlantogenata (Xenarthra+Afrotheria) and Boreoeutheria [5].
 

Biological context of Xenarthra

  • Trees for RAG1, gamma-fibrinogen, ND6, mt-tRNA, mt-RNA, c-MYC, epsilon -globin, and GHR are significantly congruent with the four main groups of mammals common to the five phylogenies, i.e., Afrotheria, Laurasiatheria, Euarchontoglires, Xenarthra plus Boreoeutheria (Laurasiatheria plus Euarchontoglires) [6].
 

Gene context of Xenarthra

  • The distribution of the vertebrate telomeric sequence (TTAGGG)(n) in four species of armadillos (Dasypodidae, Xenarthra), i.e. Chaetophractus villosus (2n = 60), Chaetophractus vellerosus (2n = 62), Dasypus hybridus (2n = 64) and Zaedyus pichiy (2n = 62) was examined by FISH with a peptide nucleic acid (PNA) probe [7].
  • To the authors' knowledge, no report regarding SRY sequences in the order Xenarthra (Edentata) has been published [8].

References

  1. Assessing the Cretaceous superordinal divergence times within birds and placental mammals by using whole mitochondrial protein sequences and an extended statistical framework. Waddell, P.J., Cao, Y., Hasegawa, M., Mindell, D.P. Syst. Biol. (1999) [Pubmed]
  2. Molecular evolution of mammalian aquaporin-2: further evidence that elephant shrew and aardvark join the paenungulate clade. Madsen, O., Deen, P.M., Pesole, G., Saccone, C., de Jong, W.W. Mol. Biol. Evol. (1997) [Pubmed]
  3. Cross-species chromosome painting in the golden mole and elephant-shrew: support for the mammalian clades Afrotheria and Afroinsectiphillia but not Afroinsectivora. Robinson, T.J., Fu, B., Ferguson-Smith, M.A., Yang, F. Proc. Biol. Sci. (2004) [Pubmed]
  4. Cloning and characterization of Fortune-1, a novel gene with enhanced expression in male reproductive organs of Cycas edentata. Zhang, P., Pwee, K.H., Tan, H.T., Kumar, P.P. Mech. Dev. (2002) [Pubmed]
  5. A new phylogenetic marker, apolipoprotein B, provides compelling evidence for eutherian relationships. Amrine-Madsen, H., Koepfli, K.P., Wayne, R.K., Springer, M.S. Mol. Phylogenet. Evol. (2003) [Pubmed]
  6. Evaluating placental inter-ordinal phylogenies with novel sequences including RAG1, gamma-fibrinogen, ND6, and mt-tRNA, plus MCMC-driven nucleotide, amino acid, and codon models. Waddell, P.J., Shelley, S. Mol. Phylogenet. Evol. (2003) [Pubmed]
  7. Chromosomal localization of the telomeric (TTAGGG)n sequence in four species of Armadillo (Dasypodidae) from Argentina: an approach to explaining karyotype evolution in the Xenarthra. Lizarralde, M.S., Bolzán, A.D., Poljak, S., Pigozzi, M.I., Bustos, J., Merani, M.S. Chromosome Res. (2005) [Pubmed]
  8. Gender determination of the Linne's two-toed sloth (Choloepus didactylus) using SRY amplified from hair. Murata, K., Masuda, R. J. Vet. Med. Sci. (1996) [Pubmed]
 
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