Research Article

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07/03/2006
Inia; Mhc DQB1 sequences; Molecular evolution; River dolphins

We report the first major histocompatibility complex (MHC) DQB1 sequences for the two species of pink river dolphins (Inia geoffrensis and Inia boliviensis) inhabiting the Amazon and Orinoco River basins. These sequences were found to be polymorphic within the Inia genus and showed shared homology with cetacean DQB-1 sequences, especially, those of ... more

M. Martínez-Agüero; S. Flores-Ramírez; M. Ruiz-García
11/10/2005
Crustacea; Maximum likelihood; Molecular evolution; Monophyly; Old genus Penaeus

Penaeid shrimps are an important resource in crustacean fisheries, representing more than the half of the gross production of shrimp worldwide. In the present study, we used a sample of wide-ranging diversity (41 shrimp species) and two mitochondrial markers (758 bp) to clarify the evolutionary relationships among Penaeidae genera. Three different methodologies of tree reconstruction ... more

C.M. Voloch; P.R. Freire; C.A.M. Russo
04/28/2009
Chagas disease; Molecular evolution; Phylogeny; Small subunit rDNA; Trypanosoma cruzi

Chagas disease is still a major public health problem in Latin America. Its causative agent, Trypanosoma cruzi, can be typed into three major groups, T. cruzi I, T. cruzi II and hybrids. These groups each have specific genetic characteristics and epidemiological distributions. Several highly virulent strains are found in the hybrid group; their origin is still a ... more

L. Tomazi; S.Y. Kawashita; P.M. Pereira; B. Zingales; M.R.S. Briones
10/14/2008
GWGR variant; HIV-1; Molecular evolution; Origin; Selective pressure; Subtype B

In spite of the remarkable diversity of HIV-1 env genes, several amino acids are extremely conserved, probably due to functional constraints. One example is the proline found at the second position of the GPGR motif. Several viruses, however, bear substitutions at this site, for instance, GWGR subtype B variant. GWGR viruses are described in Brazil since the beginning of the epidemics, but the ... more

M.E. Pinto; C.G. Schrago; A.B. Miranda; C.A.M. Russo
09/03/2013
MC1R; Molecular evolution; Positive selection; Rodentia

Adaptive variation in the melanocortin 1-receptor gene (MC1R), a key locus in melanogenesis, has been identified in some species of rodents. However, in others, MC1R has no causative role in pigmentation phenotypes despite their coat color variation. In this study, we characterized the rates and patterns of MC1R nucleotide and amino acid sequence evolution and ... more

G.L. Gonçalves; V.R. Paixão-Côrtes; T.R.O. Freitas
02/08/2013
Innate immunity; Molecular evolution; PGLYRP1 gene; Positive selection; Primate; Purifying selection

Short-type peptidoglycan (PGN)-recognition protein 1 (PGLYRP1), an innate immunity protein that directly breaks down the structure of microbial cell wall PGNs, plays an important role both in antibacterial defenses and several inflammatory diseases. To explore the adaptive evolution of the PGLYRP1 gene in primates and provide insight into the function of this antibacterial ... more

W. Liu; Y.F. Yao; L. Zhou; Q.Y. Ni; H.L. Xu
01/30/2015
GPR50 gene; Melatonin-related receptor; Molecular evolution; Primate; Sichuan snub-nosed monkey; Tibetan macaque

The melatonin-related receptor GPR50 plays an important role in mammalian adaptive thermogenesis in response to calorie intake. The evolutionary history of the GPR50 gene is poorly understood in primates; however, it has been reported that GPR50 is the mammalian ortholog of Mel1c, which has been well characterized. In this study, the complete coding sequences of the GPR50 ... more

Y. Zhang; H.Q. Li; Y.F. Yao; W. Liu; Q.Y. Ni; M.W. Zhang; H.L. Xu
10/05/2010
Chloroplast DNA; DNA barcode; Kaempferia; petA-psbJ; psbA-trnH

Genetic variation and species authentication of 71 Kaempferia accessions (representing 15 recognized, six new, and four unidentified species) found indigenously in Thailand were examined by determining chloroplast psbA-trnH and partial petA-psbJ spacer sequences. Ten closely related species (Boesenbergia rotunda, Gagnepainia godefroyi, G. ... more

J. Techaprasan; S. Klinbunga; C. Ngamriabsakul; T. Jenjittikul
04/30/2019
Active germplasm bank; Conservation of genetic resources; Ficus carica; Fig plant breeding; Phenotypic characterization

Fig (Ficus carica) is among the 20 main fruits exported by Brazil, which is the eighth largest producer of fresh figs. The characterization of active fig germplasm banks has thus become an important line of research, as it is necessary to gather information to carry out adequate management projects. The objective of this study was to characterize the ... more

M.G.F. Rodrigues; L.N.H. Monteiro; A.F.A. Ferreira; T.P.Dos Santos; B.E. Pavan; V.A.B. Neves; A.C. Boliani

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