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Phylogenetic study of Class Armophorea (Alveolata, Ciliophora) based on 18S-rDNA data Genet. Mol. Biol.
Paiva,Thiago da Silva; Borges,Bárbara do Nascimento; Silva-Neto,Inácio Domingos da.
The 18S rDNA phylogeny of Class Armophorea, a group of anaerobic ciliates, is proposed based on an analysis of 44 sequences (out of 195) retrieved from the NCBI/GenBank database. Emphasis was placed on the use of two nucleotide alignment criteria that involved variation in the gap-opening and gap-extension parameters and the use of rRNA secondary structure to orientate multiple-alignment. A sensitivity analysis of 76 data sets was run to assess the effect of variations in indel parameters on tree topologies. Bayesian inference, maximum likelihood and maximum parsimony phylogenetic analyses were used to explore how different analytic frameworks influenced the resulting hypotheses. A sensitivity analysis revealed that the relationships among higher taxa of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Caenomorpha; Metopus; Nyctotherus; Sensitivity analysis.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572013000400017
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Divergent evolution and purifying selection of the H (FUT1) gene in New World monkeys (Primates, Platyrrhini) Genet. Mol. Biol.
Borges,Bárbara do Nascimento; Harada,Maria Lúcia.
In the present study, the coding region of the H gene was sequenced and analyzed in fourteen genera of New World primates (Alouatta, Aotus, Ateles, Brachyteles, Cacajao, Callicebus, Callithrix, Cebus, Chiropotes, Lagothrix, Leontopithecus, Pithecia, Saguinus, and Saimiri), in order to investigate the evolution of the gene. The analyses revealed that this coding region contains 1,101 nucleotides, with the exception of Brachyteles, the callitrichines (Callithrix, Leontopithecus, and Saguinus) and one species of Callicebus (moloch), in which one codon was deleted. In the primates studied, the high GC content (63%), the nonrandom distribution of codons and the low evolution rate of the gene (0.513 substitutions/site/MA in the order Primates) suggest the action...
Tipo: Info:eu-repo/semantics/article Palavras-chave: H gene; Molecular evolution; Purifying selection; Divergent evolution; New World monkeys.
Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572004000300007
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