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Categories: Biology: Molecular, Paleontology: Dinosaurs

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A cytokinin-mediated, proliferation-based mechanism is involved in the generation and maintenance of cell-type specific tissue boundaries during vascular development in Arabidopsis roots. Specifically, the HANABA-TARANU transcription factor forms a feed-forward loop to cytokinin signaling, which in turn regulates the position and frequency of cell proliferation of proto-vascular cells such that mechanical stress of the surrounding tissues guides growth in an apical-oriented manor, maintaining cell patterning throughout the tissue section.

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The human immunodeficiency virus HIV-1 is able to infect various tissues in humans. Once inside the cells, the virus integrates its genome into the cellular genome and establishes persistent infections. The role of the structure and organization of the host genome in HIV-1 infection is not well understood. Using a cell culture model based on brain immune microglia cells, an international research team has now defined the insertion patterns of HIV-1 in the genome of microglia cells.

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'Miniature shredders' are at work in each cell, disassembling and recycling cell components that are defective or no longer required. The exact structure of these shredders differs from cell type to cell type, a study now shows. For example, cancer cells have a special variant that can supply them particularly effectively with building blocks for their energy metabolism.

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The androgen receptor is a key transcriptional factor for the proper sex development -- especially in males -- and the physiological balance of all the tissues that express this receptor. The androgen receptor is involved in several pathologies and syndromes, such as the spinal and bulbar muscular atrophy or androgen insensitivity syndrome, among others, for which there is no specific treatment. Regarded as the main initial and progression factor in prostate cancer -- the second most common malignant disease in men in industrialized countries -- this receptor has been, for decades, the main therapeutical target for the treatment against this disease.

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Researchers have now encapsulated the young field of nucleolar DNA damage response (DDR) pathways. A new review highlights six mechanisms by which cells repair DNA damage. By attacking these mechanisms, future applied researchers will be able to trip up cancer's reproduction and growth.

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Breaking a longstanding impasse in our understanding of olfaction, scientists have created the first molecular-level, 3D picture of how an odor molecule activates a human odorant receptor, a crucial step in deciphering the sense of smell.

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A new study represents a first step towards generating highly detailed 3-dimensional maps of lung tumors using genetically engineered mouse models.

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In a step forward for genetic engineering and synthetic biology, researchers have modified a strain of Escherichia coli bacteria to be immune to natural viral infections while also minimizing the potential for the bacteria or their modified genes to escape into the wild.

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Despite recent advancements, many highly sensitive diagnostic tests for viral diseases still require complicated techniques to prepare a sample or interpret a result, making them impractical for point-of-care settings or areas with few resources. But now, a team has developed a sensitive method that analyzes viral nucleic acids in as little as 20 minutes and can be completed in one step with 'glow-in-the-dark' proteins.

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A new study explores exactly what leads to the generation of Th17 cells -- an important subtype of cells in the intestine -- and uncovers some of the underappreciated molecular players and events that lead to cell differentiation in the gut.

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With the aid of some sea slugs, chemists have discovered that one of the smallest conceivable tweaks to a biomolecule can elicit one of the grandest conceivable consequences: directing the activation of neurons. The team has shown that the orientation of a single amino acid -- in this case, one of dozens found in the neuropeptide of a sea slug -- can dictate the likelihood that the peptide activates one neuron receptor versus another. Because different types of receptors are responsible for different neuronal activities, the finding points to another means by which a brain or nervous system can regulate the labyrinthine, life-sustaining communication among its cells.

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Researchers compared a new genetic animal model of Down syndrome to the standard model and found the updated version to be enhanced. The new mouse model shows milder cognitive traits compared to a previously studied Down syndrome mouse model.

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Scientists have done research that opens up a whole new world within our cells. Their study uncovers a vast network of interactions that assist cells in adjusting in real time to withstand stresses on our health.

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Meiotic recombination assures genetic variation during breeding. During meiotic prophase I, chromosomes are organized in a loop-base array by a proteinaceous structure called meiotic chromosome axis which is critical for meiotic recombination and genetically diverse gametes. An international research team reports the application of a TurboID (TbID)-based approach to identify proteins in proximity of meiotic chromosome axes in Arabidopsis thaliana. Not only known but also new meiotic proteins were uncovered.

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A whole new world of antibiotics is waiting inside the viruses that infect bacteria. Scientists are making it easier to study them.

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Surprisingly, bitter taste receptors are not only located in the mouth, but also elsewhere in the body, including the airways. Activating those receptors opens up lung passageways, so they're a potential target for treating asthma or chronic obstructive pulmonary disease (COPD). Now, researchers report that they have designed a potent and selective compound that could lead the way to such therapies.

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The skeleton, tendons, and glands of a functional jaw all derive from the same population of stem cells, which arise from a cell population known as neural crest. To discover how these neural crest-derived cells know to make the right type of cell in the right location, researchers focused on a particular gene, Nr5a2, that was active in a region of the face that makes tendons and glands, but not skeleton. To understand the role of Nr5a2, the scientists created zebrafish lacking this gene. These mutant zebrafish generated excess cartilage and were missing tendons in their jaws.

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Strong electric fields can be used to create pores in biomembranes. The method is known as electroporation. Inducing such defects in membranes in a targeted manner is an important technique in medicine and biotechnology, but also in the treatment of foodstuffs.

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Most cells in the bodies of living things duplicate their contents and physically separate into new cells through the process of cell division. But across many species, germ cells, those that become eggs or sperm, don't fully separate. They remain interconnected through small bridges called ring canals and cluster together. In a new study, researchers uncover how it is that germ cells in fruit flies form these ring canals, a finding that they say will provide new insights into a widely shared feature of development and into diseases in which cell division is disrupted.

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New methodology and tools provide an opportunity to watch in unprecedented detail as a phage attacks a bacterium.