Articles

Fungi associated with the roots of mangroves are thought to turn-over significant quantities of organic matter including lignocellulose. Arfi et al. investigate the lignocellolytic potential of a fungal species isolated from mangrove roots and the adaptation of its enzymatic repertoire to a high salinity environment.

The gut microbiota produces metabolites such as short-chain fatty acids (SCFAs), which can influence the development of obesity. Here Kimura et al.show that SCFAs act via the receptor GPR43, which acts as a sensor for excessive dietary energy and controls body energy utilization as well as metabolic homoeostasis.

The affinity of antibodies for their targets is enhanced by somatic hypermutation, in which the cytidine deaminase AID is recruited to immunoglobulin variable region genes in B cells. Here the authors show that the nuclear protein GANP has an important role in this process by modifying chromatin structure and enhancing AID recruitment.

Tumour suppressors can be inactivated in cancer not only as a result of mutation, but also by proteolytic degradation. Here the authors show that, during glioma development, the accumulation of the ubiquitin ligase praja2 sustains tumour growth by degrading MOB1—a core component of the Hippo pathway.

Microbes use small molecules to sense and communicate with other cells and species. Kim et al. now demonstrate that volatile compounds emitted by Bacillus subtilis can affect Escherichia colimotility and antibiotic resistance through activation of a conserved regulatory mechanism.

Amacrine interneurons act as integrators of visual information in the retina; however the developmental mechanisms that determine this cell fate remain unclear. Liu et al. find that amacrine differentiation in the retina is driven by the transcription factor RORβ1.

A positive feedback loop which results in localized accumulation of the small GTPase Cdc42 generates cell polarity in budding yeast; however, such loops are inherently susceptible to noise. Here the authors demonstrate how two pathways that mediate Cdc42 recycling work together to ensure the robustness of symmetry breaking.

Differentiated genomic regions among conserved loci, known as speciation islands, are believed to form because of reduced inter-population gene flow near loci under divergent selection. Renault et al.show that reduced recombination, rather than slower gene flow, accounts for the formation of these regions in sunflowers.

The Vogel–Fulcher–Tamman equation is widely used to describe glass dynamics, but its validity below glass-transition temperature is still in debate. Martinez-Garcia et al.propose a critical-like parameterization to connect dynamics and local symmetry, which works for a broad range of glass formers.

As cervical tumours become more invasive, levels of episomal human papillomavirus paradoxically tend to decrease. Here the authors identify a network of antiviral and cell cycle genes that is amplified by chromosomal aberrations and promotes cervical tumour progression.

The protein spinster is implicated in Drosophilacourtship behaviour. Sakurai and colleagues identify two clusters of spinster-expressing interneurons, and show that these cells are required for female receptivity to male advances.

A versatile strategy is needed to engineer fluid streams in channels for different purposes. Amini et al.develop an approach to decompose complicated fluid motion into an ensemble of fluid transformations around individual cylindrical pillars, which allows control without simulations.

Cavin proteins are key components of mammalian caveolae and are expressed from four genes in a tissue-specific manner. Gram Hansen et al. demonstrate that caveolae in the endothelia of different tissues are remarkably heterogeneous, and reveal a role for cavin 2 in determining the apparent size of cavin complexes.

The development of materials for the effective removal of oils and solvents from water is of global importance. Here, the authors show that porous, hexagonal boron nitride nanosheets are capable of absorbing many times their own weight in oil while repelling water, and may be cleaned for reuse by heating or burning in air.

Characterizing the acoustic dynamics of glasses at mesoscopic wavelengths is challenging. Here, Ferrante et al. use the broadband picosecond acoustics technique to study attenuation at such length scales, where they find temperature-dependent, fractal frequency behaviour.

With paleovirology it is possible to identify ancient endogenous viral elements within eukaryotic genomes. Here Suh and colleagues report a genomic record of hepatitis endogenizations through bird’s evolution; they find a complete hepatitis genome sequence, the first discovery of a Mesozoic paleovirus genome.

Fabricating semiconductor devices with dimensions below 10 nm presents significant challenges. Here, Liu et al. use controlled electron irradiation to remove atoms in an MoS₂ sheet, creating Mo₅S₄nanoribbons with a uniform width of 0.35 nm and a theoretical band gap of 0.77 eV.

Exciton-polaritons—coupled states of excitons and photons—exhibit interesting properties that may make them suitable as information carriers for optical computing technologies. With this goal in mind, Ballarini et al. demonstrate an all-optical polariton transistor that also operates as a logic gate.

Classical theory predicts that glass dynamics exhibit a singularity at some finite temperature. Zhao et al. test this theory in fossil amber by determining upper bounds of the equilibrium relaxation times, and find no such behaviour even far below the glass transition challenging conventional assumptions.

Multilayer stacks of graphene and related two-dimensional crystals can be tailored to create new classes of functional materials. Britnell et al. report resonant tunnelling of Dirac fermions and tunable negative differential conductance in a graphene-boron nitride-graphene transistor.