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| Open AccessZO-1 interacts with YB-1 in endothelial cells to regulate stress granule formation during angiogenesis
ZO-1, a cell junction protein, is essential for angiogenesis. Here the authors identify in endothelial cells unexpected associations of ZO-1 with stress granule proteins, such as YB-1, that are crucial for cytoprotection, implicating the ZO-1-YB-1 interaction in angiogenesis.
- Yassine El Bakkouri
- , Rony Chidiac
- & Jean-Philippe Gratton
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Article
| Open AccessTRIM25 predominately associates with anti-viral stress granules
Different environmental stressors induce different subtypes of stress granules (SGs), and each of them presumably have distinct functions. Here the authors provide a framework for understanding the compositional and functional heterogeneity of SGs, and see that TRIM25 mainly associates with anti-viral SGs.
- Zehua Shang
- , Sitao Zhang
- & Da Jia
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Article
| Open AccessCadmium binding by the F-box domain induces p97-mediated SCF complex disassembly to activate stress response programs
The F-box domain is a conserved structural motif in ubiquitin ligases known only to bind Skp1. Here, the authors show the F-box domain is also an environmental cadmium sensor that changes conformation upon binding to disassemble the active ligase, protecting the cell from cadmium stress.
- Linda Lauinger
- , Anna Andronicos
- & Peter Kaiser
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Article
| Open AccessTemporal coordination of the transcription factor response to H2O2 stress
H2O2 stress is known to activate a slew of transcription factors that restore redox balance. Here, the authors use live-cell imaging and single-cell analysis to reveal that the transcription factors that are activated and their timing of activation is dose dependent.
- Elizabeth Jose
- , Woody March-Steinman
- & Andrew L. Paek
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Article
| Open AccessDifferentiation granules, a dynamic regulator of T. brucei development
The African trypanosome Trypanosoma brucei has been shown to form stress granules in vitro that might be repurposed to enable differentiation and facilitate parasite transmission. Here, Cayla et al. show that differentiation between slender and stumpy forms does involve membrane-less granules that are different from nutritional stress granules.
- Mathieu Cayla
- , Christos Spanos
- & Keith R. Matthews
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Article
| Open AccessCompensatory growth and recovery of cartilage cytoarchitecture after transient cell death in fetal mouse limbs
How growing organs recover from transient injuries is unclear. Here, authors used mouse models of transient cell death in the limb cartilage to identify cellular and molecular mechanisms (e.g. mTORC1) involved in cartilage repair and catch-up growth.
- Chee Ho H’ng
- , Shanika L. Amarasinghe
- & Alberto Rosello-Diez
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Article
| Open AccessCold-induced FOXO1 nuclear transport aids cold survival and tissue storage
How tissues adapt to extreme cold is not well understood. Here, the authors discover a mechanism that promotes FOXO1-mediated cold survival gene transcription at low temperatures, with potential implications for long-term tissue storage for transplantation.
- Xiaomei Zhang
- , Lihao Ge
- & Jingxing Ou
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Article
| Open AccessMitochondrial H2O2 release does not directly cause damage to chromosomal DNA
Nuclear DNA damage downstream of mitochondrial ROS is often cited to contribute to cancer initiation and aging. However, here the authors show that although H2O2 induces DNA mutations when produced near DNA, it does not when released by mitochondria.
- Daan M. K. van Soest
- , Paulien E. Polderman
- & Tobias B. Dansen
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Article
| Open AccessEpigenetic modulators link mitochondrial redox homeostasis to cardiac function in a sex-dependent manner
Efforts to treat heart failure with antioxidants have failed. Here, authors reveal a robust sex-dependent endogenous defense against oxidative damage and demonstrate antioxidative treatment’s efficacy solely in subjects with inadequate redox capacity.
- Zaher ElBeck
- , Mohammad Bakhtiar Hossain
- & Christer Betsholtz
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| Open AccessDIAPH1-MFN2 interaction decreases the endoplasmic reticulum-mitochondrial distance and promotes cardiac injury following myocardial ischemia
Contact between organelles such as the mitochondria (Mito) and endoplasmic reticulum (ER) is crucial to coordinate vital cellular homeostatic processes. Here we discuss recent work showing that Mito-ER proximity is regulated by heterotypic complexes between the F-actin polymerizing protein Diaphanous-1) and the mitochondrial dynamics protein Mitofusin 2, which confers increased susceptibility to ischemia/reperfusion injury.
- Lorrie A. Kirshenbaum
- , Rimpy Dhingra
- & Sergio Lavandero
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Article
| Open AccessTFIP11 promotes replication fork reversal to preserve genome stability
The RAD51 recombinase plays a pivotal role in replication fork reversal during replication stress. Here, the authors show that the GCFC domain-containing protein TFIP11 interacts with BLM helicase and is important for fork reversal during replication stress to preserve genome stability.
- Junliang Chen
- , Mingjie Wu
- & Ting Liu
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Article
| Open AccessRescue of mitochondrial import failure by intercellular organellar transfer
Mitochondrial biogenesis and maintenance relies on protein import from the cytosol. Here, authors show that import failure impacts organelle structure and dynamics. They also identify a rescue mechanism involving intercellular mitochondrial transfer.
- Hope I. Needs
- , Emily Glover
- & Ian Collinson
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Article
| Open AccessNod1-dependent NF-kB activation initiates hematopoietic stem cell specification in response to small Rho GTPases
The signals that enable endothelial cells to switch to hemogenic to generate hematopoietic stem cells are poorly understood. Here, the authors identify an intracellular sensor of pathogens as an inductive developmental cue that primes this switch.
- Xiaoyi Cheng
- , Radwa Barakat
- & Raquel Espin-Palazon
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Article
| Open AccessTranscriptional responses of cancer cells to heat shock-inducing stimuli involve amplification of robust HSF1 binding
The authors compare the heat shock response between different cell lines and stimuli and reveal the genome-wide binding of its master transcription factor HSF1 as a platform for context-specific transcription activation.
- Sayantani Ghosh Dastidar
- , Bony De Kumar
- & Sergei Nechaev
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Article
| Open AccessRemodeling the cellular stress response for enhanced genetic code expansion in mammalian cells
Genetic code expansion (GCE) is a protein engineering tool that enables programmed and site-specific installation of noncanonical amino acids into proteins. Here, authors show that cellular stress remodelling boosts GCE in mammalian cells including GCE realized by orthogonally translating organelles.
- Mikhail E. Sushkin
- , Christine Koehler
- & Edward A. Lemke
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Article
| Open AccessUSP36 stabilizes nucleolar Snail1 to promote ribosome biogenesis and cancer cell survival upon ribotoxic stress
Targeting ribosome biogenesis with the ribosome inhibitor, homoharringtonine (HHT), is effective in leukaemia but not in solid tumours. Here, the authors demonstrate that in solid tumours, activation of JNK signaling following HHT-induced ribosomal stress promotes Snail1 accumulation in the nucleolus which facilitates ribosome biogenesis and resistance to HHT.
- Kewei Qin
- , Shuhan Yu
- & Yong Yi
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Article
| Open AccessActivation of the integrated stress response by inhibitors of its kinases
The integrated stress response (ISR) is the focus of numerous investigations and drug development programs. Here, the authors show that ATP-competitive inhibitors of ISR kinases PERK, PKR and GCN2 inhibit their targets but activate the ISR by directly binding to and activating a sister ISR kinase.
- Maria Szaruga
- , Dino A. Janssen
- & Anne Bertolotti
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Article
| Open AccessNacα protects the larval fat body from cell death by maintaining cellular proteostasis in Drosophila
Protein homeostasis is crucial for maintaining cellular homeostasis. Here, the authors show that proteotoxic stress caused by Nacalpha mutants specifically and progressively induces cell death in the apoptosis-resistant Drosophila larval fat body.
- Takayuki Yamada
- , Yuto Yoshinari
- & Takashi Nishimura
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Article
| Open AccessNuclear translocation of mitochondrial dehydrogenases as an adaptive cardioprotective mechanism
Chemotherapy can cause severe damage to cardiomyocytes in some patients but it is unclear how cardiomyocytes protect themselves against such stress. Here the authors show that cardiomyocytes initiate an endogenous protective response when exposed to chemotherapeutic agents by translocating mitochondrial enzymes to the nucleus.
- Shubhi Srivastava
- , Priyanka Gajwani
- & Jalees Rehman
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| Open AccessImbalanced unfolded protein response signaling contributes to 1-deoxysphingolipid retinal toxicity
The accumulation of cytotoxic deoxysphingolipids causes retinopathies through unknown mechanisms. Here the authors use retinal organoids to show that photoreceptor toxicity is mediated by unfolded protein response signaling.
- Jessica D. Rosarda
- , Sarah Giles
- & Kevin T. Eade
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Article
| Open AccessMitochondrial aconitase suppresses immunity by modulating oxaloacetate and the mitochondrial unfolded protein response
Mitochondrial function has been linked to immunity but the role of the Krebs’s cycle in regards the immune response is not well characterised. Here the authors show that Krebs’s cycle enzyme ACO2 suppresses immunity via modulation of oxaloacetate and the mitochondrial unfolded protein response.
- Eunah Kim
- , Andrea Annibal
- & Seung-Jae V. Lee
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Article
| Open AccessThe thioesterase APT1 is a bidirectional-adjustment redox sensor
Cellular redox homeostasis is important when responding to environmental changes. Here, the authors demonstrate APT1 is a redox sensor in plant defense and identify a pathway for oxidative stress resistance.
- Tuo Ji
- , Lihua Zheng
- & Tao Wang
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Article
| Open AccessA stress-induced cilium-to-PML-NB route drives senescence initiation
Exposure to irreparable stresses induces transient ciliogenesis, enabling communication with PML-NBs via a FBF1 pathway to trigger senescence in mammalian cells. Fbf1 ablation reduces senescence and associated health decline in mice, highlighting cilia as a promising senotherapy target.
- Xiaoyu Ma
- , Yingyi Zhang
- & Jinghua Hu
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Article
| Open AccessOxidized mitochondrial DNA induces gasdermin D oligomerization in systemic lupus erythematosus
Systemic lupus erythematosus is characterised by the generation of antibodies targeting DNA and nuclear antigens. Here, the authors show that oxidised mitochondrial DNA induces gasdermin D oligomerization and promotes pore formation in neutrophils from patients with SLE.
- Naijun Miao
- , Zhuning Wang
- & Jing Wang
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Article
| Open AccessAntecedent chromatin organization determines cGAS recruitment to ruptured micronuclei
DNA damage-induced micronuclei are linked to downstream viral signalling through the cGAS pattern recognition receptor. Here, the authors identify features of micronuclei chromatin that determine cGAS-MN recruitment and associated pathway activation.
- Kate M. MacDonald
- , Shirony Nicholson-Puthenveedu
- & Shane M. Harding
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Article
| Open AccessThe HAPSTR2 retrogene buffers stress signaling and resilience in mammals
The recently described protein HAPSTR1 governs cellular stress resilience. Here, the authors discover a mammalian HAPSTR1 paralog, called HAPSTR2, which formed via retro-transposition and operates to augment and buffer cellular stress signaling.
- David R. Amici
- , Harun Cingoz
- & Marc L. Mendillo
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Article
| Open AccessEarly response evaluation by single cell signaling profiling in acute myeloid leukemia
The molecular mechanisms underlying response to chemotherapy in Acute myeloid leukemia (AML) remain to be explored. Here, the authors perform 36-dimensional mass cytometry in 32 AML patients during intensive chemotherapy and suggest functional signalling analysis for prognosis prediction early after treatment in AML.
- Benedicte Sjo Tislevoll
- , Monica Hellesøy
- & Bjørn Tore Gjertsen
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Article
| Open AccessA p38α-BLIMP1 signalling pathway is essential for plasma cell differentiation
Plasma cells are terminally differentiated B cells that are specialized for antibody secretion. Authors show here that genomic deletion of the p38α mitogen activated protein kinase specifically in the B cell lineage leads to diminished plasma cell differentiation via impairment of a transcriptional regulatory program by BLIMP1.
- Jianfeng Wu
- , Kang Yang
- & Jiahuai Han
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Article
| Open AccessA conserved megaprotein-based molecular bridge critical for lipid trafficking and cold resilience
Environmental temperature changes can alter cell membrane lipid composition but the mechanisms underlying this conserved mechanism are unclear. Here, the authors identify the megaprotein LPD-3 in C. elegans as critical for normal phospholipid distribution and cold resilience.
- Changnan Wang
- , Bingying Wang
- & Dengke K. Ma
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Article
| Open AccessTermination of the unfolded protein response is guided by ER stress-induced HAC1 mRNA nuclear retention
Chromatin remodeler Isw1 prevents export of maturing ribonucleoprotein particles. Here, the authors show that Isw1 inhibits the Unfolded Protein Response (UPR) from the nucleus by binding and restricting export of the mRNA encoding the main effector of UPR, thereby tuning adaptation to ER stress.
- Laura Matabishi-Bibi
- , Drice Challal
- & Anna Babour
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Article
| Open AccessThe unfolded protein response reverses the effects of glucose on lifespan in chemically-sterilized C. elegans
Endoplasmic reticulum stress activates the unfolded protein response (UPR). The authors show that glucose extends the lifespan of aged animals by activating the otherwise quiescent UPR while causing a UPR-dependent reduced longevity in young animals
- Caroline Beaudoin-Chabot
- , Lei Wang
- & Guillaume Thibault
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Article
| Open AccessIntracellular energy controls dynamics of stress-induced ribonucleoprotein granules
Stress granules are associated with neurodegenerative diseases. Here, Wang et al. found intracellular energy deficiencies trigger a unique type of granules and disrupt granule disassembly through 4EBP1/eIF4A.
- Tao Wang
- , Xibin Tian
- & Jiou Wang
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Article
| Open AccessAdaptation to chronic ER stress enforces pancreatic β-cell plasticity
Pancreatic β-cells are naturally prone to ER stress due to their role in insulin production and secretion. Here, the authors show that chronic ER stress adaptive exhaustion results in an irreversible loss of β-cell function leading to T1D pathogenesis
- Chien-Wen Chen
- , Bo-Jhih Guan
- & Maria Hatzoglou
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Article
| Open AccessGolgi stress induces SIRT2 to counteract Shigella infection via defatty-acylation
Here the authors revealed a role for the protein deacetylase SIRT2 in Golgi stress, particularly induced by bacterial infection. Shigella secrete effector proteins such as IcsB, which transfers fatty acyl groups to modify host proteins to evade host immune surveillance. The upregulated SIRT2 counteracts this function by removing the fatty acyl groups and enhancing the killing of Shigella.
- Miao Wang
- , Yugang Zhang
- & Hening Lin
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Article
| Open AccessStress routes clients to the proteasome via a BAG2 ubiquitin-independent degradation condensate
While cellular stress shuts down translation, how protein degradation occurs with stress is incompletely understood. The authors describe a stress-induced phase separated organelle that mediates ubiquitin-independent degradation in the proteasome.
- Daniel C. Carrettiero
- , Maria C. Almeida
- & Kenneth S. Kosik
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Article
| Open AccessVisual barcodes for clonal-multiplexing of live microscopy-based assays
Multiplex analyses of samples allow understanding complex processes in cancer initiation, progression and therapy response. Here, the authors present a fluorescence imaging-based visual barcode for livecell clonal-multiplexing which allows identifying signalling pathways clusters in response to different chemotherapy compounds.
- Tom Kaufman
- , Erez Nitzan
- & Ravid Straussman
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Article
| Open AccessA reversible mitochondrial complex I thiol switch mediates hypoxic avoidance behavior in C. elegans
Mitochondria regulate diverse cellular signalling processes in addition to producing energy. Here, the authors show a mitochondrial redox switch that, when activated, helps nematode worms sense conditions of low environmental oxygen.
- John O. Onukwufor
- , M. Arsalan Farooqi
- & Andrew P. Wojtovich
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Article
| Open AccessDELE1 tracks perturbed protein import and processing in human mitochondria
Human mitochondria experience substantial stress and malfunction in neurological diseases. Here, the authors reveal DELE1 as a multimodal sensor of protein import and processing defects, rationalizing mitochondrial stress integration.
- Evelyn Fessler
- , Luisa Krumwiede
- & Lucas T. Jae
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Article
| Open AccessPumilio protects Xbp1 mRNA from regulated Ire1-dependent decay
In Drosophila, ER-targeted mRNAs are degraded by Ire1-dependent pathway. Here the authors report that the fly mRNA binding protein Pumilio is phosphorylated by Ire1 and binds to Xbp1 mRNA, protecting it from the non-canonical endoribonuclease activity of Ire1.
- Fátima Cairrão
- , Cristiana C. Santos
- & Pedro M. Domingos
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Article
| Open AccessOxygen-sensitive methylation of ULK1 is required for hypoxia-induced autophagy
Hypoxia induces mitochondrial clearance and autophagy, although the upstream mechanisms are not well defined. Here, the authors identify that oxygen-sensitive methylation of the key autophagy regulator ULK1 promotes ULK1 activation and subsequent autophagosome formation and mitochondrial clearance.
- Jingyi Li
- , Tao Zhang
- & Rui Liu
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Article
| Open AccessSmall Cajal body-associated RNA 2 (scaRNA2) regulates DNA repair pathway choice by inhibiting DNA-PK
Proper repair of DNA double-strand breaks is essential for genomic stability. Here, the authors report that a long non-coding RNA, scaRNA2, inhibits DNA-PK and thereby regulates the choice between error-prone NHEJ and error-free HR DNA repair.
- Sofie Bergstrand
- , Eleanor M. O’Brien
- & Marianne Farnebo
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Article
| Open AccessGlutaredoxin 1 controls monocyte reprogramming during nutrient stress and protects mice against obesity and atherosclerosis in a sex-specific manner
High-calorie diet promotes thiol oxidative stress and the reprogramming of blood monocytes, giving rise to obesogenic and proatherogenic macrophages. Here the authors report that loss of monocytic thiol transferase glutaredoxin 1 results in the derepression of sex-specific oxidative stress responses in macrophages, promoting atherogenesis and obesity in female mice.
- Yong Joo Ahn
- , Luxi Wang
- & Reto Asmis
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Article
| Open AccessPharmacologic IRE1/XBP1s activation promotes systemic adaptive remodeling in obesity
Signalling through the IRE1 arm of the unfolded protein response exerts both protective and harmful effects in obesity. Here the authors report that a selective pharmacologic activator of IRE1/XBP1s signalling stimulates an adaptive remodelling of liver and pancreas in diet-induced obese mice and mitigates obesity-linked systemic metabolic dysfunction.
- Aparajita Madhavan
- , Bernard P. Kok
- & R. Luke Wiseman
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Article
| Open AccessNeuropilin 1 regulates bone marrow vascular regeneration and hematopoietic reconstitution
Ionizing radiation and chemotherapy deplete haematopoietic stem cells and damage the vascular niche. Here the authors show that irradiation induces SEMA3A secretion from bone marrow endothelial cells (ECs), inducing EC apoptosis via NRP1 and that NRP1 inhibition promotes vascular regeneration and R spondin 2 dependent hematopoietic regeneration.
- Christina M. Termini
- , Amara Pang
- & John P. Chute
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Article
| Open AccessA genetically-encoded crosslinker screen identifies SERBP1 as a PKCε substrate influencing translation and cell division
PKCε is known to exert a role in genome protection by directly phosphorylating and switching the specificity of Aurora B. Here the authors identify SERBP1 as a parallel mitotic PKCε substrate controlling translation and ensuring the integrity of chromosome segregation and successful cell division.
- Silvia Martini
- , Khalil Davis
- & Peter J. Parker
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Article
| Open AccessHydrogen peroxide signaling via its transformation to a stereospecific alkyl hydroperoxide that escapes reductive inactivation
A major question in redox signaling is how H2O2 oxidizes target protein thiols in the presence of glutathione peroxidases and peroxiredoxins. We reveal signaling by H2O2 via its enzymatic conversion to an alkyl hydroperoxide that stereo-specifically escapes peroxidases and oxidizes target proteins.
- Raphael F. Queiroz
- , Christopher P. Stanley
- & Roland Stocker
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Article
| Open AccessmTORC2 confers neuroprotection and potentiates immunity during virus infection
The immune response to herpes simplex virus is essential in limiting immunopathology during infection, however factors linked to neuroprotection are currently unclear. Here the authors implicate mTORC2 in the host response to viral infection and link to neuroprotection.
- Rahul K. Suryawanshi
- , Chandrashekhar D. Patil
- & Deepak Shukla
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Article
| Open AccessSuppression of HSF1 activity by wildtype p53 creates a driving force for p53 loss-of-heterozygosity
Most mutant p53 heterozygous tumours undergo loss of the remaining wildtype (WT) p53 allele which leads to stabilization of the mutant p53 protein. Here, the authors show in an autochthonous colorectal cancer model that the WT p53 allele retains partial activity and suppresses the heat shock factor 1 (HSF1)- chaperone axis to prevent mutant p53 stabilisation and mutant p53 gain-of-function activities, thereby creating selective pressure for p53 loss-of-heterozygosity.
- Tamara Isermann
- , Özge Çiçek Şener
- & Ramona Schulz-Heddergott
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Article
| Open AccessYeast cell fate control by temporal redundancy modulation of transcription factor paralogs
How dynamic transcription factors temporally interact to regulate stress survival in yeast is currently unclear. Here the authors integrate single-cell imaging, RNA-seq, and modeling to identify a new cell fate control mechanism mediated by temporal redundancy modulation during yeast stress response.
- Yan Wu
- , Jiaqi Wu
- & Yihan Lin