ABSTRACT
Abstract The giant anteater (Myrmecophaga tridactyla, Pilosa, Linnaeus 1758) belongs to the mammalian order Pilosa and presents a large distribution along South America, occupying a great variety of habitats. It is listed in the IUCN Red List of threatened species as Vulnerable. Despite threatened, there is a lack of studies regarding its genetic variability. The aim of this study was to examine the genetic diversity and patterns of genetic structure within remaining populations. We analyzed 77 individuals from seven different populations distributed in four biomes across Brazil: Cerrado, Pantanal, Atlantic Forest and Amazon Forest. We sequenced two mitochondrial markers (control region and Cyt-b) and two nuclear markers (AMELY and RAG2). We found high genetic diversity within subpopulations from National Parks of Serra da Canastra and Emas, both within the Cerrado biome, with signs of population expansion. Besides, we found a notable population structure between populations from the Cerrado/Pantanal and Amazon Forest biomes. This data is a major contribution to the knowledge of the evolutionary history of the species and to future management actions concerning its conservation.
ABSTRACT
Phytases are a group of enzymes that catalyze phytic acid hydrolysis with release of phosphorus (P). The ability of Chromobacterium sp. to produce phytase was detected in 115 out of 118 candidate bacteria isolated from different Brazilian biomas. This is the first report revealing the genus Chromobacterium as phytase producer.
Subject(s)
Base Sequence , Biomass , Chromobacterium/enzymology , Chromobacterium/isolation & purification , Environmental Microbiology , Enzyme Reactivators , Eutrophication , Phosphoric Monoester Hydrolases , Peptide Hydrolases/analysis , Catalysis , Enzyme Activation , Genetic Variation , Hydrolysis , Methods , Methods , Tropical EcosystemABSTRACT
Five out of the seven recognized species of sea turtles (Testudines) occur on the Brazilian coast. The Barcode Initiative is an effort to undertake a molecular inventory of Earth biodiversity. Cytochrome Oxidase c subunit I (COI) molecular tags for sea turtle species have not yet been described. In this study, COI sequences for the five species of sea turtles that occur in Brazil were generated. These presented widely divergent haplotypes. All observed values were on the same range as those already described for other animal groups: the overall mean distance was 8.2 percent, the mean distance between families (Dermochelyidae and Cheloniidae) 11.7 percent, the mean intraspecific divergence 0.34 percent, and the mean distance within Cheloniidae 6.4 percent, this being 19-fold higher than the mean divergence observed within species. We obtained species-specific COI barcode tags that can be used for identifying each of the marine turtle species studied.
Subject(s)
Animals , DNA , DNA, Mitochondrial/analysis , Turtles/genetics , Biodiversity , Brazil , Electron Transport Complex IV , Polymerase Chain ReactionABSTRACT
We describe a new G to A transition polymorphism, designated Apt, on the human Y chromosome. The A allele chromosomes and the most closely related G allele chromosomes have been found only in India, where they make up about 1.3% of the population. They are found in several different social groups and show considerable microsatellite, minisatellite and major satellite diversity, suggesting that they do not have a recent origin.