Mariana R. P. Alves

The international development agendas have set several goals over the past two decades, in- cluding “quality education” and the establishment of partnerships that enhance the achievement of this goal. Although scientific education is an integral part of quality education, the impact of projects in these areas remains under-researched; therefore, it...

Este livro é a primeira compilação das ferramentas e recursos YE(P)STEM, projeto liderado pela Cartas com Ciência, com a parceria do CIDTFF, do YESTEM, da Biblioteca Nacional de São Tomé e Príncipe e com o apoio da Biochemical Society, através de uma Bolsa de Extensão Científica, e da Ciência Viva, através de um subsídio de apoio a projetos. Os do...

Relatório de avaliação de um evento internacional: um exemplo de abordagem avaliativa inserida num paradigma positivista que, servirá de base a uma abordagem avaliativa inserida num paradigma construtivista (em progresso) (pp. 101 - 111).

Informal education initiatives create more opportunities to bring young people closer to science. However, not every young person has access to the same opportunities. This article presents the work of Cartas com Ciência, which aims to counter social inequalities using science in an international cooperation context with eight countries where Portu...

The natural sciences are not immune to societal values and beliefs. Understanding the interference of these factors is key to protect science from becoming a servant to opportunistic interests.

Developmental enhancers bind transcription factors and dictate patterns of gene expression during development. Their molecular evolution can underlie phenotypical evolution, but the contributions of the evolutionary pathways involved remain little understood. Here, using mutation libraries in Drosophila melanogaster embryos, we observed that most p...

Developmental enhancers are DNA sequences that when bound to transcription factors dictate specific patterns of gene expression during development. It has been proposed that the evolution of such cis-regulatory elements is a major source of adaptive evolution; however, the regulatory and evolutionary potential of such elements remains little unders...

During development, complex gene expression patterns are formed, relying on the spatiotemporal coordination of proteins and genomic regulatory regions, among many other players and layers of processes. Low-affinity binding sites efficiently contribute to transcription through brief interactions with transcription factors. Concentrating transcriptio...

The pluripotency factor OCT4 is essential for the maintenance of naive pluripotent stem cells in vitro and in vivo. However, the specific role of OCT4 in this process remains unknown. Here, we developed a rapid protein-level OCT4 depletion system that demonstrates that the immediate downstream response to loss of OCT4 is reduced expression of key p...

The pluripotency factor Oct4 is essential for the maintenance of naïve pluripotent stem cells in vitro and in vivo. However, the specific role of Oct4 in this process remains unknown. Here, we developed a rapid protein-level Oct4 depletion system that demonstrates that the immediate downstream response to loss of Oct4 is reduced expression of key p...

Understanding how cell identity transitions occur and whether there are multiple paths between the same beginning and end states are questions of wide interest. Here we show that acquisition of naive pluripotency can follow transcriptionally and mechanistically distinct routes. Starting from post-implantation epiblast stem cells (EpiSCs), one route...

We previously showed in Drosophila melanogaster embryos that low-affinity Ultrabithorax (Ubx)-responsive shavenbaby (svb) enhancers drive expression using localized transcriptional environments and that active svb enhancers on different chromosomes tended to colocalize (Tsai et al., 2017). Here, we test the hypothesis that these multi-enhancer 'hub...

We had previously shown in Drosophila melanogaster embryos that low-affinity Ultrabithorax (Ubx)-responsive shavenbaby ( svb ) enhancers drive robust expression using localized transcriptional environments and that active svb enhancers tended to colocalize, even when placed on different chromosomes (Tsai et al., 2017). Here, we test the hypothesis...

Purpose Diabetic retinopathy is a neurovascular disease characterized by increased permeability of the blood–retinal barrier, changes in the neural components of the retina, and low-grade chronic inflammation. Diabetic retinopathy is a major complication of diabetes; however, the impact of a prediabetic state on the retina remains to be elucidated....

Table S3. Ranked Gene List from the Comparison of Fetal Signature Genes with the Expression Data from Ulcerative Colitis Patients and Normal Individuals, Related to Figure 2

Tissue regeneration requires dynamic cellular adaptation to the wound environment. It is currently unclear how this is orchestrated at the cellular level and how cell fate is affected by severe tissue damage. Here we dissect cell fate transitions during colonic regeneration in a mouse dextran sulfate sodium (DSS) colitis model, and we demonstrate t...

Matlab script to average radially averaged intensity distributions from individual transcription sites and offset background fluorescence.

Transcription factors bind low-affinity DNA sequences for only short durations. It is not clear how brief, low-affinity interactions can drive efficient transcription. Here we report that the transcription factor Ultrabithorax (Ubx) utilizes low-affinity binding sites in the Drosophila melanogaster shavenbaby (svb) locus and related enhancers in nu...

Naïve pluripotency is a cell state acquired in mammalian development during epiblast formation, in the pre-implantation embryo. It is characterized by the unbiased potential to make all lineages of the adult organism and can be captured in in vitro culture as embryonic stem cells. Oct4, one of the archetypal reprogramming factors, regulates the naï...