Project description:Ovule development is a key process for plant reproduction that ensures correct seed production. Understanding the molecular mechanisms that control ovule formation will also provide new approaches to increase crop yield for breeding. Several molecular factors and plant hormones, including gibberellins, are involved in ovule initiation and development. Gibberellins control ovule development by the destabilization of DELLA proteins, whereas DELLA activity has been proved to act as a positive factor for ovule primordia emergence. But the molecular mechanism by which DELLA act remained unknown. Here we have proved that DELLA proteins control ovule initiation by the formation of a protein complex with the CUC2 transcription factor. The DELLA protein GAI requires CUC2 to promote ovule primordia formation, thus GAI would function by its direct protein-protein interaction with CUC2 in cells of the placenta that determine the boundary regions between ovules during pistil development. Analysis of GAI-CUC2 interaction and colocalization in placenta support this hypothesis. Moreover, molecular analysis of the loci at which GAI protein may act as transcriptional co-regulators in a CUC2-dependent manner identified a subset of target genes that would be regulated by the GAI-CUC2 complex and contribute to regulate ovule primordia emergence.
Project description:Gut microbiota were assessed in 540 colonoscopy-screened adults by 16S rRNA gene sequencing of stool samples. Investigators compared gut microbiota diversity, overall composition, and normalized taxon abundance among these groups.
Project description:The hormones gibberellins (GA) control many aspects of plant growth and development thruough the whole life cycle of the plant. For instance, GA participate in the establishment of the skotomorphogenic developmental program that is triggered when seeds germinate in darkness, i.e. under the soil. Under these conditions seedlings appear etiolated and developmental features usually triggered by light are kept repressed. The GA signaling elements GAI and RGA have a major, partially redundant role in this process. These proteins belong to the DELLA family of transcriptional regulators and are destabilized by GA, acting as negative regulators of the pathway. In order to understand the molecular basis of the regulation of the skotomorphogenesis by GA, we sought to identify early target genes of the activity of GAI in etiolated seedlings. For that purpose we analyzed rapid, global changes in gene expression in response to a transient accummulation of a dominant version of GAI, gai-1, which is resistant to GA-induced destabilization.
Project description:The hormones gibberellins (GA) control many aspects of plant growth and development thruough the whole life cycle of the plant. For instance, GA participate in the establishment of the skotomorphogenic developmental program that is triggered when seeds germinate in darkness, i.e. under the soil. Under these conditions seedlings appear etiolated and developmental features usually triggered by light are kept repressed. The GA signaling elements GAI and RGA have a major, partially redundant role in this process. These proteins belong to the DELLA family of transcriptional regulators and are destabilized by GA, acting as negative regulators of the pathway. In order to understand the molecular basis of the regulation of the skotomorphogenesis by GA, we sought to identify early target genes of the activity of GAI in etiolated seedlings. For that purpose we analyzed rapid, global changes in gene expression in response to a transient accummulation of a dominant version of GAI, gai-1, which is resistant to GA-induced destabilization. Experiments were performed using wild type Col-0 and the transgenic line HS:gai-1 that expresses the dominant version gai-1 under the control of the promoter of the HSP18.2 gene, which is highly and rapidly induced at 37ºC. Three biological repeats were performed, and wild type and transgenic samples were labelled with Cy3 and Cy5, respectively. For each point in the time course (0, 1, 2 and 4h after a 30 minute treatment at 37ºC), a sample from the transgenic line was compared to the corresponding wild type control.
Project description:Primary outcome(s): Analysis of the diversity and composition of the gut microbiome by 16S rRNA sequencing
Study Design: Observational Study Model : Others, Time Perspective : Prospective, Enrollment : 60, Biospecimen Retention : Collect & Archive- Sample with DNA, Biospecimen Description : Blood, Stool
Project description:The impact of mono-chronic S. stercoralis infection on the gut microbiome and microbial activities in infected participants was explored. The 16S rRNA gene sequencing of a longitudinal study with 2 sets of human fecal was investigated. Set A, 42 samples were matched, and divided equally into positive (Pos) and negative (Neg) for S. stercoralis diagnoses. Set B, 20 samples of the same participant in before (Ss+PreT) and after (Ss+PostT) treatment was subjected for 16S rRNA sequences and LC-MS/MS to explore the effect of anti-helminthic treatment on microbiome proteomes.