Mapa de unidades evolutivas de aves en áreas de páramos y humedales.

Este producto es elaborado por el Programa de Gestión de la Información y el Conocimiento (GIC) en el marco del convenio 005 (13-014) entre el Instituto Humboldt y el Fondo Adaptación, en este trabajo se cuantifica la diversidad taxonómica y filogenética de las aves presentes en páramos y humedales. Adicionalmente, se evalúa la estructura filogenética de estas comunidades para detectar áreas significativamente altas o bajas en la filodiversidad que presentan. Finalmente se estiman la disimilitud evolutiva entre las comunidades, equivalente a una beta filodiversidad, con el fin de evidenciar la conectividad evolutiva de las comunidades en páramos.BogotáSubdirección de Servicios Científicos y Proyectos Especiale

Monoclonal antibody generated against Nile tilapia (Oreochromis niloticus) IgT heavy chain using a peptide-based strategy

Teleost IgT/Z plays a principal role in the defense mechanisms against infectious agents in the mucosal compartments and in systemic immunity. Previously, Nile tilapia (Oreochromis niloticus) IgT was discovered and characterized at transcription level. In this work, we generated a monoclonal antibody (mAb) that specifically recognized the Nile tilapia IgT. BALB/c mice were immunized with three synthetic peptides conjugated to KLH. The sequences of these peptides derived from the constant region of the Nile tilapia IgT heavy chain. ELISA and Western blotting confirmed the specificity of the polyclonal sera and the culture supernatant from a positive hybridoma clone. We observed immunoreactivity against a recombinant IgT fragment and native IgT in skin mucus. The anti-IgT mAb did not cross-react with purified tilapia IgM. Direct ELISA analysis allowed the quantification of skin mucus IgM and IgT concentrations. Flow cytometry analysis revealed differences in the percentage of IgT+ B cell populations between juveniles and adults in peripheral blood, head kidney and spleen lymphocytes and among the tissues analyzed. For further validation of the anti-IgT mAb utility, a recombinant vaccine candidate against sea lice (TT-P0 Ls) was injected into juvenile tilapia. Direct ELISA results revealed a differential secretion of skin mucus IgT and IgM after immunostimulation. In addition, the percentages of IgT+ B cells were determined at 7 days after booster and ex-vivo stimulation by flow cytometry. This mAb constitutes an important immunological tool to study the biological function and structural characteristics of tilapia IgT