First microsatellite markers for the Amazonian species Copaifera multijuga Hayne developed using next-generation sequencing.

Background: Native to the Amazon region, Copaifera multijuga Hayne is a large tree (≈ 36 m in height) that is heavily exploited for extraction of its oleoresin. Many studies have addressed the phytochemical properties and applications of this raw material; however, there are few initiatives that have focused on the genetic characterization of native populations of this species. To this end, our objective was to develop microsatellite markers for C.

Effects of environmental pollution on the rDNAomics of Amazonian fish.

Pollution is a growing environmental problem throughout the world, and the impact of human activities on biodiversity and the genetic variability of natural populations is increasingly preoccupying, given that adaptive processes depend on this variability, in particular that found in the repetitive DNA. In the present study, the mitochondrial DNA (COI) and the distribution of repetitive DNA sequences (18S and 5S rDNA) in the fish genome were analysed in fish populations inhabiting both polluted and unpolluted waters in the northern Amazon basin. The results indicate highly complex ribosomal sequences in the fish genome from the polluted environment because these sequences are involved primarily in the maintenance of genome integrity, mediated by a systematic increase in the number of copies of the ribosomal DNA in response to changes in environmental conditions.