Intrinsic neural timescales in the temporal lobe support an auditory processing hierarchy

During rest, intrinsic neural dynamics manifest at multiple timescales, which progressively increase along visual and somatosensory hierarchies. Theoretically, intrinsic timescales are thought to facilitate processing of external stimuli at multiple stages. However, direct links between timescales at rest and sensory processing, as well as translation to the auditory system are lacking. Here, we measured intracranial electroencephalography in 11 human patients with epilepsy (4 women), while listening to pure tones. We show that in the auditory network, intrinsic neural timescales progressively increase, while the spectral exponent flattens, from temporal to entorhinal cortex, hippocampus, and amygdala. Within the neocortex, intrinsic timescales exhibit spatial gradients that follow the temporal lobe anatomy. Crucially, intrinsic timescales at baseline can explain the latency of auditory responses: as intrinsic timescales increase, so do the single-electrode response onset and peak latencies. Our results suggest that the human auditory network exhibits a repertoire of intrinsic neural dynamics, which manifest in cortical gradients with millimeter resolution and may provide a variety of temporal windows to support auditory processing.SIGNIFICANCE STATEMENT:Endogenous neural dynamics are often characterized by their intrinsic timescales. These are thought to facilitate processing of external stimuli. However, a direct link between intrinsic timing at rest and sensory processing is missing. Here, with intracranial electroencephalography (iEEG), we show that intrinsic timescales progressively increase from temporal to entorhinal cortex, hippocampus, and amygdala. Intrinsic timescales at baseline can explain the variability in the timing of iEEG responses to sounds: cortical electrodes with fast timescales also show fast and short-lasting responses to auditory stimuli, which progressively increase in the hippocampus and amygdala. Our results suggest that a hierarchy of neural dynamics in the temporal lobe manifests across cortical and limbic structures and can explain the temporal richness of auditory responses

Polycomb Repressive Complex 2 Controls the Embryo-to-Seedling Phase Transition

Polycomb repressive complex 2 (PRC2) is a key regulator of epigenetic states catalyzing histone H3 lysine 27 trimethylation (H3K27me3), a repressive chromatin mark. PRC2 composition is conserved from humans to plants, but the function of PRC2 during the early stage of plant life is unclear beyond the fact that it is required for the development of endosperm, a nutritive tissue that supports embryo growth. Circumventing the requirement of PRC2 in endosperm allowed us to generate viable homozygous null mutants for FERTILIZATION INDEPENDENT ENDOSPERM (FIE), which is the single Arabidopsis homolog of Extra Sex Combs, an indispensable component of Drosophila and mammalian PRC2. Here we show that H3K27me3 deposition is abolished genome-wide in fie mutants demonstrating the essential function of PRC2 in placing this mark in plants as in animals. In contrast to animals, we find that PRC2 function is not required for initial body plan formation in Arabidopsis. Rather, our results show that fie mutant seeds exhibit enhanced dormancy and germination defects, indicating a deficiency in terminating the embryonic phase. After germination, fie mutant seedlings switch to generative development that is not sustained, giving rise to neoplastic, callus-like structures. Further genome-wide studies showed that only a fraction of PRC2 targets are transcriptionally activated in fie seedlings and that this activation is accompanied in only a few cases with deposition of H3K4me3, a mark associated with gene activity and considered to act antagonistically to H3K27me3. Up-regulated PRC2 target genes were found to act at different hierarchical levels from transcriptional master regulators to a wide range of downstream targets. Collectively, our findings demonstrate that PRC2-mediated regulation represents a robust system controlling developmental phase transitions, not only from vegetative phase to flowering but also especially from embryonic phase to the seedling stage

The FANCM:p.Arg658* truncating variant is associated with risk of triple-negative breast cancer

Abstract: Breast cancer is a common disease partially caused by genetic risk factors. Germline pathogenic variants in DNA repair genes BRCA1, BRCA2, PALB2, ATM, and CHEK2 are associated with breast cancer risk. FANCM, which encodes for a DNA translocase, has been proposed as a breast cancer predisposition gene, with greater effects for the ER-negative and triple-negative breast cancer (TNBC) subtypes. We tested the three recurrent protein-truncating variants FANCM:p.Arg658*, p.Gln1701*, and p.Arg1931* for association with breast cancer risk in 67,112 cases, 53,766 controls, and 26,662 carriers of pathogenic variants of BRCA1 or BRCA2. These three variants were also studied functionally by measuring survival and chromosome fragility in FANCM−/− patient-derived immortalized fibroblasts treated with diepoxybutane or olaparib. We observed that FANCM:p.Arg658* was associated with increased risk of ER-negative disease and TNBC (OR = 2.44, P = 0.034 and OR = 3.79; P = 0.009, respectively). In a country-restricted analysis, we confirmed the associations detected for FANCM:p.Arg658* and found that also FANCM:p.Arg1931* was associated with ER-negative breast cancer risk (OR = 1.96; P = 0.006). The functional results indicated that all three variants were deleterious affecting cell survival and chromosome stability with FANCM:p.Arg658* causing more severe phenotypes. In conclusion, we confirmed that the two rare FANCM deleterious variants p.Arg658* and p.Arg1931* are risk factors for ER-negative and TNBC subtypes. Overall our data suggest that the effect of truncating variants on breast cancer risk may depend on their position in the gene. Cell sensitivity to olaparib exposure, identifies a possible therapeutic option to treat FANCM-associated tumors

Finishing the euchromatic sequence of the human genome

The sequence of the human genome encodes the genetic instructions for human physiology, as well as rich information about human evolution. In 2001, the International Human Genome Sequencing Consortium reported a draft sequence of the euchromatic portion of the human genome. Since then, the international collaboration has worked to convert this draft into a genome sequence with high accuracy and nearly complete coverage. Here, we report the result of this finishing process. The current genome sequence (Build 35) contains 2.85 billion nucleotides interrupted by only 341 gaps. It covers ∼99% of the euchromatic genome and is accurate to an error rate of ∼1 event per 100,000 bases. Many of the remaining euchromatic gaps are associated with segmental duplications and will require focused work with new methods. The near-complete sequence, the first for a vertebrate, greatly improves the precision of biological analyses of the human genome including studies of gene number, birth and death. Notably, the human enome seems to encode only 20,000-25,000 protein-coding genes. The genome sequence reported here should serve as a firm foundation for biomedical research in the decades ahead

How do healthcare professionals experience communication with people with aphasia and what content should Communication Partner Training entail?

Purpose: Aphasia after stroke has been shown to lead to communication difficulties between healthcare professionals (HCP) and people with aphasia. Clinical guidelines emphasize the importance of teaching HCP to use supportive conversative techniques through communication partner training (CPT). The aim of this study is to explore and describe the experiences of HCP in communicating with people with aphasia and their needs and wishes for the content in CPT. Materials and methods: The data were collected through qualitative semi-structured interviews with 17 HCP. HCP were recruited from two geriatric rehabilitation centres in the Netherlands and one academic hospital in Belgium. The interviews drew upon the qualitative research methodologies ethnography and phenomenology and were thematically analysed using the six steps of Braun & Clarke. Results: Three themes were derived from the interviews. HCP experienced that communication difficulties impede healthcare activities (theme 1) and reported the need to improve communication through organizational changes (theme 2), changing the roles of SLTs (theme 3) and increasing knowledge and skills of HCP (theme 4). Conclusions: According to HCP, communication difficulties challenge the provision of healthcare activities and lead to negative feelings in HCP. HCP suggest that communication can be improved by providing more time in the healthcare pathway of people with aphasia, adapting healthcare information to the needs of people with aphasia, commitment of physicians and managers, changing the roles of SLTs and improving knowledge and skills of HCP. Implications for rehabilitation Communication between healthcare professionals (HCP) and people with aphasia can be improved by training HCP to use supportive conversation techniques and tools. An important condition for successful implementation of communication partner trainings in healthcare centres is to identify the experiences of HCP with communication with people with aphasia and their needs and wishes for training content. This study shows that communication problems between HCP and people with aphasia impede diagnosis and therapy with considerable implications for healthcare quality. The suggestions that HCP have concerning the content of communication partner trainings can be placed under "education" and "implementation and post-training support." HCP describe specific roles for speech-and language therapists to fulfil after the training and suggest two main changes that should be made at an organizational level

Evaluating communication partner training in healthcare centres: Understanding the mechanisms of behaviour change

Background Communication between people with aphasia and their healthcare professionals (HCPs) can be greatly improved when HCPs are trained in using supportive conversation techniques and tools. Communication partner training (CPT) is an umbrella term that covers a range of interventions that train the conversation partners of people with aphasia. Several CPT interventions for HCPs have been developed and used to support HCPs to interact successfully with people with aphasia. Aims The objective of this study was to identify the mechanisms of change as a result of a Dutch CPT intervention, named CommuniCare, in order to evaluate and optimise the intervention. Methods & procedures A total of 254 HCPs from five different healthcare centres received CommuniCare. An explorative qualitative research design was chosen. Two interviews were conducted with 24 HCPs directly after and 4 months after receiving the training that was part of CommuniCare. Two conceptual frameworks were used to deductively code the interviews. HCPs’ perspectives were coded into a four-part sequence following CIMO logic: the self-reported use of supportive conversation techniques or tools pre-intervention (Context), the intervention elements (Intervention) that evoked certain mechanisms (Mechanisms), resulting in the self-reported use of supportive conversation techniques and tools post-intervention (Outcomes). The Capabilities Opportunities Motivation–Behaviour (COM-B) model was used to fill in the Mechanisms component. Outcomes & results Three themes were identified to describe the mechanisms of change that led to an increase in the use of supportive conversation techniques and tools. According to HCPs, (i) information, videos, e-learning modules, role-play, feedback during training and coaching on the job increased their psychological capabilities; (ii) information and role-play increased their automatic motivations; and (iii) information, videos and role-play increased their reflective motivations. Remaining findings show HCPs’ perspectives on various barriers to use supportive conversation techniques and tools. Conclusions & implications HCPs in this study identified elements in our CPT intervention that positively influenced their behaviour change. Of these, role-play and coaching on the job were particularly important. HCPs suggested this last element should be better implemented. Therefore, healthcare settings wishing to enhance HCPs’ communication skills should first consider enhancing HCPs’ opportunities for experiential learning. Second, healthcare settings should determine which HCPs are suitable to have a role as implementation support practitioners, to support their colleagues in the use of supportive conversation techniques and tools

Ways to improve communication and support in healthcare centres according to people with aphasia and their relatives: a Dutch perspective

Background There is an increasing amount of research that investigates the needs and wishes of people with aphasia and their relatives with regards to improving the accessibility of communication with healthcare professionals (HCP). An important way to improve this is by training HCP to use supportive conversation techniques and tools. Objectives This study aimed to inform the development of such a training, by adding to previous findings in the literature regarding the experiences, needs and wishes of people with aphasia and their relatives. We were interested in their experiences with the accessibility of communication and support from HCP and how they believed this can be improved. Methods An exploratory qualitative research design was chosen. Data was collected through qualitative semi-structured interviews with 20 people with aphasia and 12 relatives. The time post stroke ranged from 3 months to 41 years. Results Four themes described the data. According to people with aphasia and relatives (1) information transfer in healthcare settings and (2) the use of supported conversation techniques by HCP are inadequate, (3) there is a lack of shared decision-making in healthcare settings, and (4) support, guidance, counseling and education is mainly targeted at the person with aphasia. Conclusions People with aphasia and relatives reported a variety of positive and negative experiences in all themes. Even though guidelines and interventions have been developed to improve healthcare for people with aphasia and their relatives, we found that people still encounter substantial challenges in access to- and provision of information, shared decision-making, support and communication with HCP. The findings in this study provide some important recommendations for improvement, including the improvement of transfer of information, shared decision-making and individual support for the relatives

The influence of balanced and imbalanced resource supply on biodiversity-functioning relationship across ecosystems

Numerous studies show that increasing species richness leads to higher ecosystem productivity. This effect is often attributed to more efficient portioning of multiple resources in communities with higher numbers of competing species, indicating the role of resource supply and stoichiometry for biodiversity-ecosystem functioning relationships. Here, we merged theory on ecological stoichiometry with a framework of biodiversity-ecosystem functioning to understand how resource use transfers into primary production. We applied a structural equation model to define patterns of diversity-productivity relationships with respect to available resources. Meta-analysis was used to summarize the findings across ecosystem types ranging from aquatic ecosystems to grasslands and forests. As hypothesized, resource supply increased realized productivity and richness, but we found significant differences between ecosystems and study types. Increased richness was associated with increased productivity, although this effect was not seen in experiments. More even communities had lower productivity, indicating that biomass production is often maintained by a few dominant species, and reduced dominance generally reduced ecosystem productivity. This synthesis, which integrates observational and experimental studies in a variety of ecosystems and geographical regions, exposes common patterns and differences in biodiversity-functioning relationships, and increases the mechanistic understanding of changes in ecosystems productivity.status: publishe

The influence of balanced and imbalanced resource supply on biodiversity–functioning relationship across ecosystems

Numerous studies show that increasing species richness leads to higher ecosystem productivity. This effect is often attributed to more efficient portioning of multiple resources in communities with higher numbers of competing species, indicating the role of resource supply and stoichiometry for biodiversity–ecosystem functioning relationships. Here, we merged theory on ecological stoichiometry with a framework of biodiversity–ecosystem functioning to understand how resource use transfers into primary production. We applied a structural equation model to define patterns of diversity–productivity relationships with respect to available resources. Meta-analysis was used to summarize the findings across ecosystem types ranging from aquatic ecosystems to grasslands and forests. As hypothesized, resource supply increased realized productivity and richness, but we found significant differences between ecosystems and study types. Increased richness was associated with increased productivity, although this effect was not seen in experiments. More even communities had lower productivity, indicating that biomass production is often maintained by a few dominant species, and reduced dominance generally reduced ecosystem productivity. This synthesis, which integrates observational and experimental studies in a variety of ecosystems and geographical regions, exposes common patterns and differences in biodiversity–functioning relationships, and increases the mechanistic understanding of changes in ecosystems productivity