MicroRNAs (miRNAs) are endogenous small non-coding RNAs (ncRNAs) which play important regulatory roles in physiological processes such as cellular differentiation, proliferation, development, apoptosis and stem cell self-renewal. An increasing number of papers have clearly claimed their involvement in cancer, providing, in some cases, also the molecular mechanisms implicated. Several studies led to the conclusion that miRNAs can be effectively used as anticancer agents alone or in combination with existing anticancer drugs. In particular, miRNAs can be effectively used to overcome drug resistance, one of the main factors responsible for anticancer treatment insuccess. One of the main questions remains how to modulate the expression of miRNAs in cancer cells. Interestingly, a few studies have shown that the expression of miRNAs is affected by drugs (including some drugs currently used as anticancer agents), therefore providing the rationale for an intertwined scenario in which miRNAs can be modulated by drugs and, in turn, can affect drug sensitivity of cancer cells.
The genus
Caveolin-1 (Cav-1) isoforms, including Cav-1α and Cav-1β, were identified as integral membrane proteins and the major components of caveolae. Cav-1 proteins are highly conserved during evolution from
Cellulose biosynthesis is a topic of intensive research not only due to the significance of cellulose in the integrity of plant cell walls, but also due to the potential of using cellulose, a natural carbon source, in the production of biofuels. Characterization of the composition, regulation, and trafficking of cellulose synthase complexes (CSCs) is critical to an understanding of cellulose biosynthesis as well as the characterization of additional proteins that contribute to the production of cellulose either through direct interactions with CSCs or through indirect mechanisms. In this review, a highlight of a few proteins that appear to affect cellulose biosynthesis, which includes: KORRIGAN (KOR), Cellulose Synthase-Interactive Protein 1 (CSI1), and the poplar microtubule-associated protein, PttMAP20, will accompany a description of cellulose synthase (CESA) behavior and a discussion of CESA trafficking compartments that might act in the regulation of cellulose biosynthesis.
Cell is the functional unit of life. To study the complex interactions of systems of biological molecules, it is crucial to dissect these molecules at the cell level. In recent years, major progresses have been made by plant biologists to profile gene expression in specific cell types at the genome-wide level. Approaches based on the isolation of cells, polysomes or nuclei have been developed and successfully used for studying the cell types from distinct organs of several plant species. These cell-level data sets revealed previously unrecognized cellular properties, such as cell-specific gene expression modules and hormone response centers, and should serve as essential resources for functional genomic analyses. Newly developed technologies are more affordable to many laboratories and should help to provide new insights at the cellular resolution in the near future.
Histone ubiquitylation has emerged as an important chromatin modification associated with DNA damage signaling and repair pathways. These histone marks, laid down by E3 ubiquitin ligases that include RNF8 and RNF168, decorate chromatin domains surrounding DNA double-strand breaks (DSBs). Recent work implicated ubiquitylated histones in orchestrating cell cycle checkpoints, DNA repair and gene transcription. Here we summarize recent advances that contribute to our current knowledge of the highly dynamic nature of DSB-associated histone ubiquitylation, and discuss major challenges ahead in understanding the versatility of ubiquitin conjugation in maintaining genome stability.
Chloroplasts are photosynthetic organelles derived from endosymbiotic cyanobacteria during evolution. Dramatic changes occurred during the process of the formation and evolution of chloroplasts, including the large-scale gene transfer from chloroplast to nucleus. However, there are still many essential characters remaining. For the chloroplast division machinery, FtsZ proteins, Ftn2, SulA and part of the division site positioning system— MinD and MinE are still conserved. New or at least partially new proteins, such as FtsZ family proteins FtsZ1 and ARC3, ARC6H, ARC5, PDV1/PDV2 and MCD1, were introduced for the division of chloroplasts during evolution. Some bacterial cell division proteins, such as FtsA, MreB, Ftn6, FtsW and FtsI, probably lost their function or were gradually lost. Thus, the chloroplast division machinery is a dynamically evolving structure with both conservation and innovation.
Animals exhibit behavioral differences in their sensitivity to ethanol, a trait that is at least in part due to genetic predispositions. This study has implicated a large neuronal protein involving Highwire, a