Mostrando recursos 1 - 4 de 4

  1. The first steps of adaptation of Escherichia coli to the gut are dominated by soft sweeps

    João Barroso-Batista; Ana Sousa; Marta Lourenço; Marie-Louise Bergman; Jocelyne Demengeot; Karina B. Xavier; Isabel Gordo
    The accumulation of adaptive mutations is essential for survival in novel environments. However, in clonal populations with a high mutational supply, the power of natural selection is expected to be limited. This is due to clonal interference - the competition of clones carrying different beneficial mutations - which leads to the loss of many small effect mutations and fixation of large effect ones. If interference is abundant, then mechanisms for horizontal transfer of genes, which allow the immediate combination of beneficial alleles in a single background, are expected to evolve. However, the relevance of interference in natural complex environments, such as the gut, is poorly known. To address this...
    - 15-dic-2017

  2. NOS2 Variants Reveal a Dual Genetic Control of Nitric Oxide Levels, Susceptibility to Plasmodium Infection, and Cerebral Malaria

    Trovoada, M. d. J.; Martins, M.; Ben Mansour, R.; Sambo, M. d. R.; Fernandes, A. B.; Antunes Goncalves, L.; Borja, A.; Moya, R.; Almeida, P.; Costa, J.; Marques, I.; Macedo, M. P.; Coutinho, A.; Narum, D. L.; Penha-Goncalves, C.
    This deposit is composed by the main article plus the supplementary materials of the publication.
    - 28-ago-2017

  3. RAG Recombinase as a Selective Pressure for Genome Evolution

    Passagem-Santos, D.; Bonnet, M.; Sobral, D.; Trancoso, I.; Silva, J.G.; Barreto, V.M.; Athanasiadis, A.; Demengeot, J.; Pereira-Leal, J.B.
    The RAG recombinase is a domesticated transposable element co-opted in jawed vertebrates to drive the process of the so-called V(D)J recombination, which is the hallmark of the adaptive immune system to produce antigen receptors. RAG targets, namely, the Recombination Signal Sequences (RSS), are rather long and degenerated sequences, which highlights the ability of the recombinase to interact with a wide range of target sequences, including outside of antigen receptor loci. The recognition of such cryptic targets by the recombinase threatens genome integrity by promoting aberrant DNA recombination, as observed in lymphoid malignancies. Genomes evolution resulting from RAG acquisition is an...
    - 15-ene-2017

  4. RAG Recombinase as a Selective Pressure for Genome Evolution

    Passagem-Santos, D.; Bonnet, M.; Sobral, D.; Trancoso, I.; Silva, J.G.; Barreto, V.M.; Athanasiadis, A.; Demengeot, J.; Pereira-Leal, J.B.
    The RAG recombinase is a domesticated transposable element co-opted in jawed vertebrates to drive the process of the so-called V(D)J recombination, which is the hallmark of the adaptive immune system to produce antigen receptors. RAG targets, namely, the Recombination Signal Sequences (RSS), are rather long and degenerated sequences, which highlights the ability of the recombinase to interact with a wide range of target sequences, including outside of antigen receptor loci. The recognition of such cryptic targets by the recombinase threatens genome integrity by promoting aberrant DNA recombination, as observed in lymphoid malignancies. Genomes evolution resulting from RAG acquisition is an...
    - 15-dic-2017

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