Beware the anti-science label p.133

Presenting science as a battle for truth against ignorance is an unhelpful exaggeration.

doi: 10.1038/545133b

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Censorship of addiction research is an abuse of science p.133

Researchers must stand up to funders that insist on gagging clauses.

doi: 10.1038/nature.2017.21948

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Brainstorming is not the way to discuss scientific issues p.134

An intellectual free-for-all doesn’t lead to the common ground on which research can build.

doi: 10.1038/545134a

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Satellite images reveal gaps in global population data p.141

Algorithms help to produce precise maps of where people in developing countries live and work.

doi: 10.1038/545141a

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NIH grant limits rile biomedical research community p.142

Scientists are split over whether limiting grant support to individuals will help young researchers or hurt collaboration.

doi: 10.1038/nature.2017.21949

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Cell maps reveal fresh details on how the immune system fights cancer p.143

Immune cells that encompass and invade tumours could dictate the success or failure of therapy.

doi: 10.1038/nature.2017.21931

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Ghana telescope heralds first pan-African array p.144

By converting a defunct communications dish, astronomers are breaking ground on Earth and beyond.

doi: 10.1038/545144a

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Science publishers try new tack to combat unauthorized paper sharing p.145

Rise in copyright breaches prompts industry to discuss ways to allow ‘fair sharing’ of articles.

doi: 10.1038/545145a

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News Features


The secret war against counterfeit science p.148


doi: 10.1038/545148a

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News & Views


Stem cells: Subclone wars p.160

多能性幹細胞は、あらゆる種類の細胞を生み出すが、in vitroで増殖させるとがんを生じる遺伝子変異を獲得する場合があることが今回分かった。この知見は、基礎研究や臨床における多能性細胞の使用に影響を及ぼす。

doi: 10.1038/nature22490

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Hydrology: Asian glaciers are a reliable water source p.161


doi: 10.1038/545161a

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Structural Biology: An ion-transport enzyme that rocks p.162


doi: 10.1038/nature22492

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Quantum Physics: Atomic envoy enables molecular control p.164


doi: 10.1038/545164a

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Molecular biology: The long and short of a DNA-damage response p.165


doi: 10.1038/nature22488

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Artificial Intelligence: A social spin on language analysis p.166


doi: 10.1038/545166a

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Asia’s glaciers are a regionally important buffer against drought p.169

Glaciers in the high mountains of Asia provide a uniquely drought-resilient source of water, supplying summer meltwater sufficient for the basic needs of 136 million people.

doi: 10.1038/nature22062

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Whole-genome landscapes of major melanoma subtypes p.175

The first large, high-coverage whole-genome sequencing study of melanomas from cutaneous, acral and mucosal sites.

doi: 10.1038/nature22071

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Maintenance of persistent activity in a frontal thalamocortical loop p.181

Thalamic neurons show selective persistent activity that predicts movement direction, and their photoinhibition decreases activity in the anterior lateral motor cortex, and vice versa, suggesting that persistent activity requires reciprocal excitation in a thalamocortical loop.

doi: 10.1038/nature22324

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Visualization and targeting of LGR5+ human colon cancer stem cells p.187

LGR5+ cells in human colorectal cancer tissue xenografted into mice act as cancer stem cells, and differentiated cancer cells can revert to cancer stem cells and express LGR5 after ablation of existing LGR5+ cells.

doi: 10.1038/nature22081

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Protein–phospholipid interplay revealed with crystals of a calcium pump p.193

Solvent contrast modulation reveals how the lipid bilayer actively participates in the conformational switches of Ca2+-ATPase through the actions of tryptophan, arginine and lysine residues, which function as membrane floats and anchors.

doi: 10.1038/nature22357

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Multi-phase volcanic resurfacing at Loki Patera on Io p.199

Interferometric telescope observations of the Jovian moon Io reveal that the floor of the Loki Patera volcano has been resurfaced in two waves, with different starting times and velocities.

doi: 10.1038/nature22339

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Preparation and coherent manipulation of pure quantum states of a single molecular ion p.203

By exploiting a co-trapped Ca+ ion, a single CaH+ ion is prepared in pure quantum states, which are coherently manipulated, using a protocol that could easily be extended to other molecular ion species.

doi: 10.1038/nature22338

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The effect of illumination on the formation of metal halide perovskite films p.208

Films of metal halide perovskite are used as the absorber material in solar cells, and light irradiation during their formation is shown to affect their crystallization, morphology and photovoltaic performance.

doi: 10.1038/nature22072

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Decarboxylative alkenylation p.213

Starting with alkyl carboxylic acids, a simple olefin synthesis using any substitution pattern or geometry, based on amide-bond synthesis with nickel- or iron-based catalysis, is described.

doi: 10.1038/nature22307

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Thalamic amplification of cortical connectivity sustains attentional control p.219

The mediodorsal nucleus of the thalamus amplifies the functional connectivity of the prefrontal cortex, thereby sustaining cortical representations of rule sets without relaying categorical information.

doi: 10.1038/nature22073

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FGF-dependent metabolic control of vascular development p.224

Fibroblast growth factor receptor (FGFR) signalling is a crucial regulator of endothelial metabolism and vascular development.

doi: 10.1038/nature22322

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Human pluripotent stem cells recurrently acquire and expand dominant negative P53 mutations p.229

The authors surveyed whole-exome and RNA-sequencing data from 252 unique pluripotent stem cell lines, some of which are in the pipeline for clinical use, and found that approximately 5% of cell lines had acquired mutations in the TP53 gene that allow mutant cells to rapidly outcompete non-mutant cells, but do not prevent differentiation.

doi: 10.1038/nature22312

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Surrogate Wnt agonists that phenocopy canonical Wnt and β-catenin signalling p.234

Wnt proteins modulate cell proliferation and differentiation and the self-renewal of stem cells by inducing β-catenin-dependent signalling through the Wnt receptor frizzled (FZD) and the co-receptors LRP5 and LRP6 to regulate cell fate decisions and the growth and repair of several tissues. The 19 mammalian Wnt proteins are cross-reactive with the 10 FZD receptors, and this has complicated the attribution of distinct biological functions to specific FZD and Wnt subtype interactions. Furthermore, Wnt proteins are modified post-translationally by palmitoylation, which is essential for their secretion, function and interaction with FZD receptors. As a result of their acylation, Wnt proteins are very hydrophobic and require detergents for purification, which presents major obstacles to the preparation and application of recombinant Wnt proteins. This hydrophobicity has hindered the determination of the molecular mechanisms of Wnt signalling activation and the functional importance of FZD subtypes, and the use of Wnt proteins as therapeutic agents. Here we develop surrogate Wnt agonists, water-soluble FZD–LRP5/LRP6 heterodimerizers, with FZD5/FZD8-specific and broadly FZD-reactive binding domains. Similar to WNT3A, these Wnt agonists elicit a characteristic β-catenin signalling response in a FZD-selective fashion, enhance the osteogenic lineage commitment of primary mouse and human mesenchymal stem cells, and support the growth of a broad range of primary human organoid cultures. In addition, the surrogates can be systemically expressed and exhibit Wnt activity in vivo in the mouse liver, regulating metabolic liver zonation and promoting hepatocyte proliferation, resulting in hepatomegaly. These surrogates demonstrate that canonical Wnt signalling can be activated by bi-specific ligands that induce receptor heterodimerization. Furthermore, these easily produced, non-lipidated Wnt surrogate agonists facilitate functional studies of Wnt signalling and the exploration of Wnt agonists for translational applications in regenerative medicine.

doi: 10.1038/nature22306

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Non-equivalence of Wnt and R-spondin ligands during Lgr5+ intestinal stem-cell self-renewal p.238

The canonical Wnt/β-catenin signalling pathway governs diverse developmental, homeostatic and pathological processes. Palmitoylated Wnt ligands engage cell-surface frizzled (FZD) receptors and LRP5 and LRP6 co-receptors, enabling β-catenin nuclear translocation and TCF/LEF-dependent gene transactivation. Mutations in Wnt downstream signalling components have revealed diverse functions thought to be carried out by Wnt ligands themselves. However, redundancy between the 19 mammalian Wnt proteins and 10 FZD receptors and Wnt hydrophobicity have made it difficult to attribute these functions directly to Wnt ligands. For example, individual mutations in Wnt ligands have not revealed homeostatic phenotypes in the intestinal epithelium—an archetypal canonical, Wnt pathway-dependent, rapidly self-renewing tissue, the regeneration of which is fueled by proliferative crypt Lgr5+ intestinal stem cells (ISCs). R-spondin ligands (RSPO1–RSPO4) engage distinct LGR4–LGR6, RNF43 and ZNRF3 receptor classes, markedly potentiate canonical Wnt/β-catenin signalling, and induce intestinal organoid growth in vitro and Lgr5+ ISCs in vivo. However, the interchangeability, functional cooperation and relative contributions of Wnt versus RSPO ligands to in vivo canonical Wnt signalling and ISC biology remain unknown. Here we identify the functional roles of Wnt and RSPO ligands in the intestinal crypt stem-cell niche. We show that the default fate of Lgr5+ ISCs is to differentiate, unless both RSPO and Wnt ligands are present. However, gain-of-function studies using RSPO ligands and a new non-lipidated Wnt analogue reveal that these ligands have qualitatively distinct, non-interchangeable roles in ISCs. Wnt proteins are unable to induce Lgr5+ ISC self-renewal, but instead confer a basal competency by maintaining RSPO receptor expression that enables RSPO ligands to actively drive and specify the extent of stem-cell expansion. This functionally non-equivalent yet cooperative interaction between Wnt and RSPO ligands establishes a molecular precedent for regulation of mammalian stem cells by distinct priming and self-renewal factors, with broad implications for precise control of tissue regeneration.

doi: 10.1038/nature22313

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Dominant protection from HLA-linked autoimmunity by antigen-specific regulatory T cells p.243

The molecular mechanism of Goodpasture disease is modelled to mechanistically determine how a human leukocyte antigen (HLA) allele can exert its dominant protective effect in autoimmune disease.

doi: 10.1038/nature22329

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構造生物学:コアメディエーターの3.4 Å分解能での構造により拡張された転写開始複合体モデル

Core Mediator structure at 3.4 Å extends model of transcription initiation complex p.248

The 3.4 Å crystal structure of the 15-subunit core Mediator complex in yeast.

doi: 10.1038/nature22328

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