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| Open AccessThe oncogenicity of tumor-derived mutant p53 is enhanced by the recruitment of PLK3
The mechanisms of how gain-of-function (GOF) mutant p53 drives carcinogenesis are unclear. Here, the authors show that a GOF mutant p53 requires its transactivation capability to induce mouse lung tumors and this is dependent on PLK3 phosphorylation of GOF mutant p53.
- Catherine A. Vaughan
- , Shilpa Singh
- & Sumitra Deb
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| Open AccessIlluminating cellular formaldehyde
Writing in Nature communications, Zhu and collaborators reported the development of a genetically encoded sensor for the detection of formaldehyde in cells and tissues. This tool has great potential to transform formaldehyde research; illuminating a cellular metabolite that has remained elusive in live structures.
- Carla Umansky
- , Agustín E. Morellato
- & Lucas B. Pontel
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Article
| Open AccessCaveolae-mediated Tie2 signaling contributes to CCM pathogenesis in a brain endothelial cell-specific Pdcd10-deficient mouse model
Animal models that fully recapitulate human CCM pathogenesis are not currently available. Here, the authors establish a novel CCM model and reveal that caveolae-Tie2 signaling is involved in CCMs formation at the level of venules, which is accompanied by gradual dissociation of pericytes.
- Huanjiao Jenny Zhou
- , Lingfeng Qin
- & Wang Min
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Article
| Open AccessCTLA-4 expression by B-1a B cells is essential for immune tolerance
CTLA-4 is an important co-inhibitory receptor for T cells. Here, the authors show that CTLA-4 also has a function on B-1a cells, as conditional deletion results in activation of these cells and knockout mice develop an autoimmune profile.
- Yang Yang
- , Xiao Li
- & Leonore A. Herzenberg
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Article
| Open AccessSVIP is a molecular determinant of lysosomal dynamic stability, neurodegeneration and lifespan
Valosin-Containing Protein (VCP) is linked to diverse degenerative diseases. Here, the authors show that Small VCP Interacting Protein (SVIP) recruits VCP to lysosomes, with gain and loss of SVIP muscle expression modifying neural degeneration, animal behaviour and lifespan.
- Alyssa E. Johnson
- , Brian O. Orr
- & Graeme W. Davis
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Article
| Open AccessFilamentous recombinant human Tau activates primary astrocytes via an integrin receptor complex
The mechanisms underlying the transmission of Tau in astrocytes are unclear. Here, the authors show that the entry of filamentous recombinant human Tau into astrocytes via the integrin αV/ β1 complex stimulates integrin signaling, resulting in activation of NFκB and astrocyte conversion towards a neurotoxic state.
- Peng Wang
- & Yihong Ye
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Article
| Open AccessMetavinculin modulates force transduction in cell adhesion sites
Muscle cells express an adhesion molecule called metavinculin, which has been associated with cardiomyopathies. Here, the authors employed molecular tension sensors to reveal that metavinculin expression modulates cell adhesion mechanics and they develop a mouse model to demonstrate that the presence of metavinculin is not as critical for heart muscle function as previously thought.
- Verena Kanoldt
- , Carleen Kluger
- & Carsten Grashoff
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Article
| Open AccessEpigenetic activation of a RAS/MYC axis in H3.3K27M-driven cancer
Histone H3 at lysine 27 (H3K27M) is often mutated in cancer but its role in tumour initiation is unclear. Here, the authors generated a transgenic model expressing H3.3K27M from the Fabp7 gene promoter, demonstrating that H3.3K27M can initiate diverse tumorigesis on its own, acting through a RAS/MYC transcriptomic programme.
- Sanja Pajovic
- , Robert Siddaway
- & Cynthia Hawkins
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Article
| Open AccessA macrophage-specific lncRNA regulates apoptosis and atherosclerosis by tethering HuR in the nucleus
Long non coding RNA molecules have been implicated in the immunopathology of a range of inflammatory pathologies. Here the authors show lncRNA MAARS regulates apoptosis via interaction with HuR in the context of atherosclerosis.
- Viorel Simion
- , Haoyang Zhou
- & Mark W. Feinberg
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Article
| Open AccessSUCLA2 mutations cause global protein succinylation contributing to the pathomechanism of a hereditary mitochondrial disease
The pathomechanism of succinyl-CoA ligase (SCL) deficiency, a hereditary mitochondrial disease, is not fully understood. Here, the authors show that increased succinyl-CoA levels contribute to SCL pathology by causing global protein hyper-succinylation.
- Philipp Gut
- , Sanna Matilainen
- & Eric Verdin
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Article
| Open AccessRRP7A links primary microcephaly to dysfunction of ribosome biogenesis, resorption of primary cilia, and neurogenesis
The RRP7A a gene is involved in ribosome biogenesis. Here the authors report a homozygous missense mutation segregating with primary microcephaly, and show that this occurs via functional defects in both nucleoli and primary cilia disrupting cell proliferation and neurogenesis.
- Muhammad Farooq
- , Louise Lindbæk
- & Lars Allan Larsen
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Article
| Open AccessTransient commensal clonal interactions can drive tumor metastasis
Cooperative interactions among tumor cells may have important implications for metastasis. Here, the authors examined the spatio-temporal nature of interactions among clonal populations of ovarian carcinoma cells and found that transient interactions cells can promote metastases via commensal interactions.
- Suha Naffar-Abu Amara
- , Hendrik J. Kuiken
- & Joan S. Brugge
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Article
| Open AccessmTORC1 activation in lung mesenchyme drives sex- and age-dependent pulmonary structure and function decline
The cellular origins of lymphangioleiomyomatosis (LAM), a rare fatal lung disease, are poorly understood. Here the authors identify a mesenchymal cell hub coordinating the LAM phenotype and develop a LAM mouse model where they investigate the co-operative dysregulation of mTORC1 and WNT growth pathways in the sex- and age-specific changes leading to structural and functional decline.
- Kseniya Obraztsova
- , Maria C. Basil
- & Vera P. Krymskaya
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Article
| Open AccessLSH mediates gene repression through macroH2A deposition
The human ICF 4 syndrome is caused by mutation of the chromatin remodeller LSH. Here, the authors show that LSH depletion disrupts the ability of histone variant macroH2A to insert into chromatin and silence transcription.
- Kai Ni
- , Jianke Ren
- & Kathrin Muegge
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Article
| Open AccessATF4 leads to glaucoma by promoting protein synthesis and ER client protein load
Glaucoma is the leading cause of irreversible blindness affecting over 70 million people worldwide. Here, the authors show that inhibition of chronic ER stress-induced ATF4-CHOP-GADD34 signaling pathway rescues pathology in mouse models of glaucoma, thus suggesting a possible treatment strategy.
- Ramesh B. Kasetti
- , Pinkal D. Patel
- & Gulab S. Zode
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Article
| Open AccessSigma-1 receptor chaperones rescue nucleocytoplasmic transport deficit seen in cellular and Drosophila ALS/FTD models
The (G4C2)-RNA hexanucleotide repeat expansion upstream of the start codon of the C9orf72 gene plays a critical role in familial ALS. The authors show that Sig1R, a ligand-regulated molecular chaperone, counteracts the aberrant nucleocytoplasmic distribution of Ran caused by the (G4C2)-RNA repeats.
- Pin-Tse Lee
- , Jean-Charles Liévens
- & Tsung-Ping Su
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Article
| Open AccessAPOE4 exacerbates synapse loss and neurodegeneration in Alzheimer’s disease patient iPSC-derived cerebral organoids
APOE4 is a strong genetic risk factor for late-onset Alzheimer’s disease. Here, the authors show that APOE4 is associated with AD features in hiPSCs-derived cerebral organoids. Isogenic conversion of APOE4 to APOE3 attenuates the AD-associated phenotype.
- Jing Zhao
- , Yuan Fu
- & Guojun Bu
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Article
| Open AccessGene expression and functional deficits underlie TREM2-knockout microglia responses in human models of Alzheimer’s disease
Mutations in TREM2 alter risk for Alzheimer’s disease, though the mechanisms underlying risk in human cells are unclear. Here, the authors use iPS-microglia and chimeric mice to highlight altered survival, phagocytosis, migration, and transcriptional programs in microglia lacking TREM2.
- Amanda McQuade
- , You Jung Kang
- & Mathew Blurton-Jones
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Article
| Open AccessCHIP phosphorylation by protein kinase G enhances protein quality control and attenuates cardiac ischemic injury
Carboxyl terminus of Hsc70-interacting protein (CHIP) is proteostasis regulator. Here the authors show that CHIP-mediated protein turnover is enhanced by PKG-mediated phosphorylation, which results in attenuated cardiac ischemic proteotoxicity.
- Mark J. Ranek
- , Christian Oeing
- & David A. Kass
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Article
| Open AccessContribution of GATA6 to homeostasis of the human upper pilosebaceous unit and acne pathogenesis
Although acne vulgaris is the most common human inflammatory skin disease, its pathogenic mechanisms remain incompletely understood. Here the authors show that GATA6 is involved in maintaining homeostasis of the upper pilosebaceous unit of human skin and may contribute to acne pathogenesis.
- Bénédicte Oulès
- , Christina Philippeos
- & Fiona M. Watt
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Article
| Open AccessType 2 and interferon inflammation regulate SARS-CoV-2 entry factor expression in the airway epithelium
ACE2 and TMPRSS2 have received recent attention as entry factors for SARS-CoV-2. Here the authors analyze nasal airway transcriptome data from 695 children determining ACE2 and TMPRSS2 expression is induced by viral and type2 inflammation, respectively, and both exhibit eQTLs that vary across world populations.
- Satria P. Sajuthi
- , Peter DeFord
- & Max A. Seibold
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Article
| Open AccessEnteroendocrine cells couple nutrient sensing to nutrient absorption by regulating ion transport
Enteroendocrine cells (EECs) are specialized gastrointestinal cells that have a role in nutrient sensing and hormone secretion. Here the authors show that peptide YY from EECs regulates nutrient absorption in intestinal organoids.
- Heather A. McCauley
- , Andrea L. Matthis
- & James M. Wells
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Article
| Open AccessHaploinsufficiency of RREB1 causes a Noonan-like RASopathy via epigenetic reprogramming of RAS-MAPK pathway genes
Mutations in RAS-MAPK pathway genes are implicated in Noonan-spectrum, yet up to 20% of cases have unknown cause. Here, the authors identify RREB1 underlying a 6p microdeletion RASopathy-like syndrome and show that RREB1, SIN3A and KDM1A form a transcriptional repressive complex to control methylation of MAPK pathway genes.
- Oliver A. Kent
- , Manipa Saha
- & Robert Rottapel
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Article
| Open AccessNEMF mutations that impair ribosome-associated quality control are associated with neuromuscular disease
Defective protein quality control is a key feature of neurodegeneration. Here, the authors show that mutations in Nemf/NEMF, a component of the Ribosome-associated Quality Control complex, have a neurodegenerative effect in mice and may underlie neuromuscular disease in seven unrelated families.
- Paige B. Martin
- , Yu Kigoshi-Tansho
- & Gregory A. Cox
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Article
| Open AccessMaintenance of sarcomeric integrity in adult muscle cells crucially depends on Z-disc anchored titin
Titin is considered an integrator of muscle cell proteins but direct evidence is limited. Here, titin is inactivated in adult mouse muscles, which causes sarcomere disassembly, protein mis-expression and force impairment, recapitulating key alterations in critical illness myopathy patient muscles.
- Sandra Swist
- , Andreas Unger
- & Wolfgang A. Linke
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Article
| Open AccessIntracellular sodium elevation reprograms cardiac metabolism
The failing heart is characterised by both alterations in mitochondrial metabolism and an elevation of cytosolic sodium. Here, the authors use 23Na NMR and metabolic profiling to show these are related, and that elevation in intracellular Na reprograms cardiac substrate utilisation via effects on mitochondrial Na/Ca exchange.
- Dunja Aksentijević
- , Anja Karlstaedt
- & Michael J. Shattock
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Article
| Open AccessLung-derived HMGB1 is detrimental for vascular remodeling of metabolically imbalanced arterial macrophages
Lung damage increases abdominal aortic aneurysm (AAA) incidence, but the mechanism was unclear. Here, the authors show that injured lungs leak HMGB1, increasing RIPK3 expression in arterial macrophages that subsequently alters mitochondrial function, leading to MMP12 expression and AAA development.
- Ludovic Boytard
- , Tarik Hadi
- & Bhama Ramkhelawon
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Article
| Open AccessITGB3-mediated uptake of small extracellular vesicles facilitates intercellular communication in breast cancer cells
The integrin ITGB3 has been described to play an essential role in breast cancer metastasis, but the precise mechanisms remain undefined. Here the authors describe thus far unknown roles of ITGB3 in the uptake of extracellular vesicles, required for colony growth of breast cancer cells.
- Pedro Fuentes
- , Marta Sesé
- & Santiago Ramón y Cajal
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Article
| Open AccessA scalable CRISPR/Cas9-based fluorescent reporter assay to study DNA double-strand break repair choice
Cells employ different repair pathways to repair DNA double strand breaks. Here, the authors develop a CRISPR/Cas9-dependent method to study choices in DNA repair called the Color Assay Tracing-Repair (CAT-R) which simultaneously measure outcomes of DSB repair via end-protection and end-resection pathways.
- Paris Roidos
- , Stephanie Sungalee
- & Balca R. Mardin
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Article
| Open AccessElucidating the fundamental fibrotic processes driving abdominal adhesion formation
Abdominal adhesions are a common cause of bowel obstruction, but knowledge regarding adhesion biology and anti-adhesion therapies remains limited. Here the authors report a systematic analysis of mouse and human adhesion tissues demonstrating that visceral fibroblast JUN and associated PDGFRA expression promote adhesions, and JUN suppression can prevent adhesion formation.
- Deshka S. Foster
- , Clement D. Marshall
- & Michael T. Longaker
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Article
| Open AccessInhibition of autophagy curtails visual loss in a model of autosomal dominant optic atrophy
Autosomal dominant optic atrophy is caused by mutations in the mitochondrial fusion protein OPA1. Here, the authors show that AMPK-induced autophagy depletes mitochondria in axons of retinal ganglion cells and that autophagic inhibition reverses vision loss in a mouse model.
- Marta Zaninello
- , Konstantinos Palikaras
- & Luca Scorrano
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Article
| Open AccessMammalian histones facilitate antimicrobial synergy by disrupting the bacterial proton gradient and chromosome organization
Histones have a role in antimicrobial defense. Here, the authors show that the histone H2A and the antimicrobial peptide LL-37 exert synergistic effects by enhancing bacterial membrane pores and enabling H2A entry into the bacterial cytoplasm, where it reorganizes DNA and inhibits transcription.
- Tory Doolin
- , Henry M. Amir
- & Albert Siryaporn
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Article
| Open AccessVEGFR2 signaling drives meningeal vascular regeneration upon head injury
Severe head injury results in critical damage of blood vessels of the meninges and brain parenchyma. Here, the authors describe key pathways governing meningeal vascular regeneration following head injury, characterizing the differential roles of VEGFR2, Tie2, Dll4 and PDGFRβ signaling.
- Bong Ihn Koh
- , Hyuek Jong Lee
- & Injune Kim
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Article
| Open AccessSTAT3 serine phosphorylation is required for TLR4 metabolic reprogramming and IL-1β expression
TLR4 signalling can reprogram the metabolism of macrophages to be more glycolytic and proinflammatory. Here the authors show that LPS and TLR4 signalling results in recruitment of TBK1, which in turn phosphorylates serine 727 on STAT3 to enable a proinflammatory switch via an effect on mitochondrial metabolism.
- Jesse J. Balic
- , Hassan Albargy
- & Ashley Mansell
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Article
| Open AccessMutations in COMP cause familial carpal tunnel syndrome
Familial carpal tunnel syndrome (CTS) is common, but causal genes are not characterized. Here the authors report two CTS-related mutations in two large families that impair secretion of COMP in tenocytes, leading to ER stress-induced unfolded protein response, inflammation and fibrosis in patients and mouse models.
- Chunyu Li
- , Ni Wang
- & Bo Gao
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Article
| Open AccessThe Bartonella autotransporter BafA activates the host VEGF pathway to drive angiogenesis
Pathogenic bacteria of the genus Bartonella can induce vasoproliferative lesions during infection. Here, Tsukamoto et al. show that this effect is caused by a secreted protein that induces cell proliferation and angiogenesis by acting as an analog of the host’s vascular endothelial growth factor (VEGF).
- Kentaro Tsukamoto
- , Naoaki Shinzawa
- & Yohei Doi
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Article
| Open AccessEEF1A1 deacetylation enables transcriptional activation of remyelination
The molecular mechanisms regulating remyelination are unclear. Here, the authors show that promoting deacetylation of eEF1A1 prevents the translocation of Sox10 outside the nucleus, contributing to maintaining the expression of Sox10 target genes and increasing remyelination efficiency.
- Mert Duman
- , Adrien Vaquié
- & Claire Jacob
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Article
| Open AccessκB-Ras and Ral GTPases regulate acinar to ductal metaplasia during pancreatic adenocarcinoma development and pancreatitis
The molecular mechanisms of acinar-to-ductal metaplasia (ADM) in the course of pancreatitis and cancer development are unclear. Here, the authors show that loss of κB-Ras and consequent Ral activation promotes tumour initiation and progression through persistent ADM and enhanced cell proliferation
- Stephanie Beel
- , Lina Kolloch
- & Andrea Oeckinghaus
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Article
| Open AccessPathogenic ARH3 mutations result in ADP-ribose chromatin scars during DNA strand break repair
Defects in DNA single-strand break repair are associated with neurodegenerative disease. Here the authors reveal that mutations in ARH3 interfere with the catabolism of mono-(ADP-ribose) and lead to its accumulation on core histones following repair of endogenous or exogenous DNA single-strand breaks.
- Hana Hanzlikova
- , Evgeniia Prokhorova
- & Keith W. Caldecott
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Article
| Open AccessDiamond Blackfan anemia is mediated by hyperactive Nemo-like kinase
Diamond Blackfan Anemia (DBA) is a congenital bone marrow failure syndrome that is associated with anemia. Here, the authors examine the role of Nemo-like kinase (NLK) in erythroid cells in the pathogenesis of DBA and as a potential target for therapy.
- M. C. Wilkes
- , K. Siva
- & K. M. Sakamoto
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Article
| Open AccessTMEM16K is an interorganelle regulator of endosomal sorting
The endolysosomal pathway plays an important role in regulating protein and lipid sorting and degradation. Here, the authors show that TMEM16K, an endoplasmic reticulum lipid scramblase, forms ER-endosome contact sites where it regulates endosomal sorting.
- Maja Petkovic
- , Juan Oses-Prieto
- & Yuh Nung Jan
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Article
| Open AccessmiR-181a initiates and perpetuates oncogenic transformation through the regulation of innate immune signaling
The majority of high grade serous ovarian cancers originate from fallopian tube secretory epithelial cells (FTSECs). Here the authors show that miR-181a drives oncogenic transformation in FTSECs through the cooperative inhibition of the tumor suppressor RB1 and of STING, resulting in genomic instability and suppression of intrinsic interferon signaling.
- Matthew Knarr
- , Rita A. Avelar
- & Analisa DiFeo
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Article
| Open AccessmTOR and S6K1 drive polycystic kidney by the control of Afadin-dependent oriented cell division
mTOR activation is known to generate polycystic kidneys, which show both increased proliferation and loss of oriented cell division (OCD). Here, Bonucci et al. show that loss of OCD is linked to S6K1 activation through its direct target Afadin and is separable from hyperproliferation.
- Martina Bonucci
- , Nicolas Kuperwasser
- & Mario Pende
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Article
| Open AccessEndothelial activation of caspase-9 promotes neurovascular injury in retinal vein occlusion
Retinal vein occlusion can cause blindness, and features neuronal dysfunction, inflammation and breakdown of vascular integrity. Here the authors report a non-apoptotic role of endothelial caspase-9 in regulating blood-retina barrier integrity and neuronal survival, which can be therapeutically targeted in a mouse model of retinal vein occlusion.
- Maria I. Avrutsky
- , Crystal Colón Ortiz
- & Carol M. Troy
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Article
| Open AccessSIRT1 accelerates the progression of activity-based anorexia
Anorexia nervosa is an eating disorder characterized by fear of gaining weight that can lead to serious complications. Here the authors show that inhibition of SIRT1 is protective against the onset and progression of anorectic behavior in an activity-based anorexia model, suggesting SIRT1 could be a potential therapeutic target.
- Timothy M. Robinette
- , Justin W. Nicholatos
- & Sergiy Libert
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Article
| Open AccessThe Perlman syndrome DIS3L2 exoribonuclease safeguards endoplasmic reticulum-targeted mRNA translation and calcium ion homeostasis
The DIS3L2 exonuclease degrades aberrant 7SL RNAs tagged by an oligouridine 3′-tail. Here the authors analyze DIS3L2 knockout mouse embryonic stem cells and suggest that DIS3L2-mediated quality control of 7SL RNA is important for ER-mediated translation and calcium ion homeostasis.
- Mehdi Pirouz
- , Chih-Hao Wang
- & Richard I. Gregory
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Article
| Open AccessActivin-mediated alterations of the fibroblast transcriptome and matrisome control the biomechanical properties of skin wounds
The relationship between histopathology, gene expression, and biochemical and mechanical properties of wounds is largely unknown. Here, the authors show that activin A alters wound healing at multiple levels by promoting pro-fibrotic gene expression and matrix deposition, thereby affecting biomechanical properties of skin wounds.
- Mateusz S. Wietecha
- , Marco Pensalfini
- & Sabine Werner
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Article
| Open AccessRaptor determines β-cell identity and plasticity independent of hyperglycemia in mice
During the progression of type 2 diabetes, insulin-producing β-cells can lose their identity and become reprogrammed into other cell types. Here the authors show that murine diabetic β-cells require the protein Raptor for maintaining β-cell health and preventing them from turning into α-cells, independent of Raptor’s involvement in regulating blood sugar levels.
- Qinglei Yin
- , Qicheng Ni
- & Guang Ning
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Article
| Open AccessDissecting the cellular specificity of smoking effects and reconstructing lineages in the human airway epithelium
Chronic lung diseases are characterized by molecular and cellular composition changes. Here the authors use single-cell RNA sequencing to map cell type-specific changes in human tracheal epithelium related to smoking, and to provide evidence for a tuft-like progenitor for pulmonary neuroendocrine cells and ionocytes.
- Katherine C. Goldfarbmuren
- , Nathan D. Jackson
- & Max A. Seibold