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How dense is it inside living cells?

A recent study published in Nature Communications reveals that the nucleus is less dense than the surrounding cytoplasm, despite its rich biomolecular composition. The researchers used light to probe density at microscales and found a consistent nuclear-to-cytoplasmic density ratio across eukaryotes.

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Muscle’s master regulator moonlights as gene silencer

Scientists have discovered that MYOD protein can act as a gene silencer, clearing out old 'furniture' to reset the cell's identity. This finding challenges dogma and opens up new avenues for understanding cellular reprogramming and regenerative medicine therapies.

Colored nuclei reveal cellular key genes

Researchers at the University of Bonn have developed an optical CRISPR screening method called NIS-Seq that allows for the identification of key genes involved in biological processes. This method is faster and more efficient than traditional methods, working in almost all cells and providing results in a matter of days.

A fresh spin on nuclear centering

Researchers used two specialized microscopes to measure the forces that keep the nucleus centered within a living cell, providing new clues about cellular cytoplasm and organelle motion. The study found that the force required to move the nucleus in C. elegans was approximately 1/6th less than that measured in sea urchin eggs.

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Cytophysics: how cell nuclei squeeze through

LMU researchers investigated how cell nuclei change shape to migrate through tight spaces, revealing reversible nuclear deformation and adaptation of pulling and pushing forces. The study suggests a biphasic dependence of migration speed on channel width, with maximal transition rates at widths comparable to the nuclear diameter.

The hidden architect

Researchers discovered that nuclei pack strongly, ordering cells into crystalline arrays, and control tissue stiffness. The study challenges the status quo, revealing a new role for nuclei in organ formation.

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Chloroplast from the father

Scientists at Max Planck Institute discovered that paternal chloroplasts can be transmitted to offspring under cold conditions, allowing for selective breeding of traits from genetic material. This finding may enable plant breeders to use chloroplast genes in new ways.

Building a better biopsy

A new biopsy procedure is developed with a multispectral confocal endomicroscope to aid in lung tissue imaging. The system allows for simultaneous imaging of multiple fluorescent dyes, enabling unique identification and spectral unmixing.

Mind your Qs: polyQ-binding protein 5 scaffolds the nucleolus

Researchers from Tokyo Medical and Dental University found that PQBP5/NOL10 is a core structural element of the nucleolus, forming a meshwork that supports other nucleolar substructures. It remains in the nucleolus under osmotic stress conditions and anchors reassembly of the nucleolar structure.

Key to the erroneous activation of the immune system

Researchers investigated Aicardi-Goutières syndrome and found that viral RNA recognition drives uncontrolled interferon production. The immune system mistakenly attacks healthy cells due to the failure of safety mechanisms to distinguish between viral and host genetic material.

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Novel supramolecular CRISPR–Cas9 carrier enables more efficient genome editing

A team of researchers from Kumamoto University has developed a transformable polyrotaxane carrier that can facilitate genome editing using Cas9RNP with high efficiency. The carrier, called amino-PRX, is multi-step transformable and has low cytotoxicity, making it an enormously promising candidate for safe and efficient delivery.

Untangling a DNA replication mystery may lead to new antimalarial drugs

A team of scientists has discovered that the enzyme DNA topoisomerase VI plays a critical role in removing chromosome tangles in plants, which may lead to new antimalarial drug targets. The study provides unprecedented insight into the mechanism of action of this enzyme and its potential applications in plant breeding.

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Unlocking the secret of cell regulation

Scientists at the University of Bonn have developed a new method to study the structure of long ribonucleic acids, which are crucial for cellular regulation. The technique involves marking specific locations on the RNA with artificial flags and measuring their distances using a molecular ruler.

DNA dominos on a chip

Researchers at TU Munich and Weizmann Institute successfully recreated DNA condensation on a biochip, replicating the tightly packed structure found in cell nuclei and viruses. This breakthrough enables better understanding of biological processes and potential applications in artificial cells.

How do plants protect themselves against sunburn?

Researchers discovered a UV-B receptor that activates proteins to build defense mechanisms, allowing plants to tolerate harmful UV-B rays. Plants also use UV-B rays to influence growth and development, making them essential for survival.

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Substance from broccoli can moderate defects

Researchers at the Technical University of Munich have discovered that broccoli's sulforaphane can reduce progerin accumulation and DNA damage in HGPS cells. The study suggests that this natural compound could be a potential therapeutic approach for treating the disease.

Ancient protein-making enzyme moonlights as DNA protector

Researchers found that an ancient protein-making enzyme, TyrRS, has a second major function: protecting DNA during cellular stress. This discovery could lead to better therapies for radiation injuries and hereditary disorders like Charcot-Marie-Tooth disease.

Starting signal for antiviral defense

A team of scientists has discovered Rad50's crucial role in detecting and responding to foreign DNA from viruses. The protein interacts with a specific signal protein CARD9, forming a complex that activates the immune system's alarm mechanism, leading to the production of interleukin-1β.

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Non-coding RNA relocates genes when it's time to go to work

Researchers at UC San Diego School of Medicine discovered that non-coding RNAs TUG1 and NEAT2 relocate genes to activate their function in response to growth signals. This process provides a new understanding of the interaction between regulated genes and human diseases.

Study shows how retinoic acid enters a cell's nucleus

Scientists have found that retinoic acid, a cancer-fighting vitamin A derivative, enters a cell's nucleus via protein CRABP-II by exposing positive charges on its amino acids. This discovery could lead to new treatments for various diseases, including leukemia and breast cancer.

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