Home-brew tests need regulation p.5

A US proposal to regulate medical diagnostics from individual labs reflects the tests’ growing complexity. Such guidance should be welcomed, not resisted.

doi: 10.1038/512005a

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Binary star to spill celestial secrets p.13

Close approach and violent interaction of stars in η Carinae system will provide rare insight into stellar enigma.

doi: 10.1038/512013a

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Hidden bonus from vaccination p.14

Immunization against pneumococcus in Africa also reduces levels of antibiotic resistance.

doi: 10.1038/512014a

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オープンアクセス・ジャーナルをまとめる最大級のサイトDOAJ(Directory of Open Access Journals)が、悪質な雑誌を閉め出すため、サイトへの掲載基準を厳格化へ。

Open-access website gets tough p.17

Leading directory tightens listing criteria to weed out rogue journals.

doi: 10.1038/512017a

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米国のPCORI(Patient-Centered Outcomes Research Institute)が、PCORnetと呼ばれる大きな臨床ネットワークを利用して、心疾患に対するアスピリンの効果を調べる研究を。

US big-data health network launches aspirin study p.18

PCORI clinical-research initiative will collect information on some 30 million people.

doi: 10.1038/512018a

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News Features


Organic synthesis: THE ROBO-CHEMIST p.20


doi: 10.1038/512020a

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News & Views


Materials chemistry: Seeds of selective nanotube growth p.30


doi: 10.1038/512030a

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Cancer: Directions for the drivers p.31


doi: 10.1038/nature13649

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Neurodegeneration: Alzheimer's disease under strain p.32


doi: 10.1038/512032a

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Astrophysics: Portrait of a doomed star p.34


doi: 10.1038/512034a

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HIV: Early treatment may not be early enough p.35


doi: 10.1038/nature13647

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Evolution: Tooth structure re-engineered p.36


doi: 10.1038/nature13651

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Convergence of terrestrial plant production across global climate gradients p.39

Net primary production is affected by temperature and precipitation, but whether this is a direct kinetic effect on plant metabolism or an indirect ecological effect mediated by changes in plant age, plant biomass or growing season length is unclear — this study develops metabolic scaling theory to be able to answer this question and applies it to a global data set of plant productivity, concluding that it is indirect effects that explain the influence of climate on productivity, which is characterized by a common scaling relationship across climate gradients.

doi: 10.1038/nature13470

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Replaying evolutionary transitions from the dental fossil record p.44

Gradual changes that occur to mammalian tooth morphology across evolutionary time were modeled in vitro and in vivo by modulation of signalling pathways in the mouse, and computer modelling was used to provide further analysis of the parameters influencing tooth morphology.

doi: 10.1038/nature13613

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Structure of the DDB1–CRBN E3 ubiquitin ligase in complex with thalidomide p.49

The crystal structures of thalidomide and its derivatives bound to the E3 ligase subcomplex DDB1–CRBN are shown; these drugs are found to have dual functions, interfering with the binding of certain cellular substrates to the E3 ligase but promoting the binding of others, thereby modulating the degradation of cellular proteins.

doi: 10.1038/nature13527

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A luminous, blue progenitor system for the type Iax supernova 2012Z p.54

The detection of the luminous, blue progenitor system of the type Iax supernova 2012Z suggests that this supernova was the explosion of a white dwarf accreting material from a helium-star companion.

doi: 10.1038/nature13615

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Tunable spin–spin interactions and entanglement of ions in separate potential wells p.57

The ability of individual ions trapped in separate potential wells to simulate spin–spin interactions is demonstrated by tuning the Coulomb interaction between two ions, independently controlling their local wells and entangling their internal states with a fidelity of approximately 0.82.

doi: 10.1038/nature13565

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Controlled synthesis of single-chirality carbon nanotubes p.61

Present preparation methods fail to meet fully the demand for structurally pure single-walled carbon nanotubes; surface-catalysed cyclodehydrogenation reactions are now shown to convert precursor molecules deposited on a platinum(111) surface into ultrashort nanotube seeds that can then be grown further into defect-free and structurally pure single-walled carbon nanotubes of single chirality.

doi: 10.1038/nature13607

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A global ocean inventory of anthropogenic mercury based on water column measurements p.65

GEOTRACES sampling of deep water from the Atlantic, Pacific and Southern oceans allows an estimate of the amount (tripled in surface waters) and distribution (two-thirds increase in water less than a thousand metres deep) of anthropogenic mercury accumulating in the global ocean.

doi: 10.1038/nature13563

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Negative regulation of the NLRP3 inflammasome by A20 protects against arthritis p.69

Pathogenesis of rheumatoid arthritis depends critically on the NLRP3 inflammasome/interleukin-1 signalling axis.

doi: 10.1038/nature13322

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Rapid seeding of the viral reservoir prior to SIV viraemia in rhesus monkeys p.74

Reservoirs of virus infection represent the most important reason why HIV-1 cannot be cured with current antiretroviral drugs; now the refractory viral reservoir is shown to be seeded as early as 3 days after infection in a monkey model, even before the virus is detected in the blood.

doi: 10.1038/nature13594

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Neuropathy of haematopoietic stem cell niche is essential for myeloproliferative neoplasms p.78

Myeloproliferative neoplasms are caused by mutations in the haematopoietic stem cell (HSC) compartment, and here the authors show that the HSC niche contributes to the pathogenesis; sympathetic innervation of mesenchymal stem cells (MSCs) is reduced in the bone marrow of patients, which leads to reduced MSC numbers and increased mutant HSC expansion, and restoring sympathetic regulation of MSCs with neuroprotective/sympathomimetic drugs prevents mutant HSC expansion.

doi: 10.1038/nature13383

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PVT1 dependence in cancer with MYC copy-number increase p.82

Pvt1 overexpression in mice contributes to high Myc levels due to 8q24.21 gain and to MYC-driven tumorigenesis.

doi: 10.1038/nature13311

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Putative cis-regulatory drivers in colorectal cancer p.87

Examination of allele-specific expression identifies 71 genes with excess somatic cis-regulatory effects in colorectal cancer (CRC), and 1,693 and 948 expression quantitative trait loci (eQTLs) in normal samples and tumours, respectively (with 36% of tumour eQTLs exclusive to CRC); tumour-specific eQTLs are more enriched for low CRC genome-wide association study P values and accumulate more somatic mutations than shared eQTLs, suggesting a role as germline-derived cancer regulatory drivers.

doi: 10.1038/nature13602

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分子生物学:ショウジョウバエの発生エンハンサーのin vivoにおけるゲノム規模での機能的特徴付け

Genome-scale functional characterization of Drosophila developmental enhancers in vivo p.91

Systematically assaying the activity of 7,705 candidate enhancers during Drosophila embryogenesis shows that nearly half are active in the embryo and display dynamic spatial patterns during development; enhancer activity is matched to expression patterns of putative target genes and predictive cis-regulatory motifs are identified.

doi: 10.1038/nature13395

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Enhancer loops appear stable during development and are associated with paused polymerase p.96

A high-resolution map of enhancer three-dimensional contacts during Drosophila embryogenesis shows that although local regulatory interactions are frequent, long-range interactions are also very common; unexpectedly, most interactions appear unchanged between tissues and across development and are formed prior to gene expression, indicating that transcription initiates from preformed enhancer–promoter loops, which are associated with paused polymerase.

doi: 10.1038/nature13417

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Visualizing the kinetic power stroke that drives proton-coupled zinc(ii) transport p.101

The proton gradient is a principal energy source for respiration-dependent active transport, but the structural mechanisms of proton-coupled transport processes are poorly understood. YiiP is a proton-coupled zinc transporter found in the cytoplasmic membrane of Escherichia coli. Its transport site receives protons from water molecules that gain access to its hydrophobic environment and transduces the energy of an inward proton gradient to drive Zn(ii) efflux. This membrane protein is a well-characterized member of the family of cation diffusion facilitators that occurs at all phylogenetic levels. Here we show, using X-ray-mediated hydroxyl radical labelling of YiiP and mass spectrometry, that Zn(ii) binding triggers a highly localized, all-or-nothing change of water accessibility to the transport site and an adjacent hydrophobic gate. Millisecond time-resolved dynamics reveal a concerted and reciprocal pattern of accessibility changes along a transmembrane helix, suggesting a rigid-body helical re-orientation linked to Zn(ii) binding that triggers the closing of the hydrophobic gate. The gated water access to the transport site enables a stationary proton gradient to facilitate the conversion of zinc-binding energy to the kinetic power stroke of a vectorial zinc transport. The kinetic details provide energetic insights into a proton-coupled active-transport reaction.

doi: 10.1038/nature13382

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