Response to comment on "Human-specific gain of function in a developmental enhancer"

Duret and Galtier argue that human-specific sequence divergence and gain of function in the HACNS1 enhancer result from deleterious biased gene conversion (BGC) with no contribution from positive selection. We reinforce our previous conclusion by analyzing hypothesized BGC events genomewide and assessing the effect of recombination rates on human-accelerated conserved noncoding sequence ascertainment. We also provide evidence that AT → GC substitution bias can coexist with positive selection

The Development and Implementation of a Culturally Safe Survey for Measuring Knowledge, Attitudes and Values around FASD and Alcohol Use During Pregnancy in a Remote Australian Aboriginal Community Setting

Fetal Alcohol Spectrum Disorder (FASD) describes a lifelong neurodevelopmental disability caused by prenatal alcohol exposure that has a devastating impact on individuals, families and communities. The prevalence of FASD is high in some Indigenous communities around the World and the only active case ascertainment prevalence study conducted in Australia found a rate of 19.44 per 100 children in the remote Fitzroy Valley region of Western Australia. Following this study community led FASD prevention activities were implemented under the Marulu (“Worth Nurturing”) Strategy in the Fitzroy Valley. A Knowledge, Attitudes and Practices survey was designed to assess the impact of the prevention campaign and gather more information about knowledge of the dangers of alcohol use in pregnancy and FASD, local attitudes, and health behaviours both around alcohol and more generally including where residents received their health information. Best practices recommend including local Aboriginal people in the development of surveys and aiming to achieve cultural security. Actions taken included consulting with local health workers during survey development, translation of key sections of the survey into the local Kimberley Kriol, and performing the surveys with the assistance of Aboriginal Community Researchers. The full survey is made available in this paper. The surveys were conducted with 200 community members during August 2015 and 203 in October 2015. Surveys were updated between the first and second waves based on learnings during implementation. Key implementation details around weather and timing, gender/kinship issues, group participation, declining participation, problematic questions and responses to the survey are described. Cultural safety was achieved but further steps could be taken to ensure future cultural security by embedding cultural safety protocols in the survey and further community consultation

The Rise of the s-Process in the Galaxy

From newly-obtained high-resolution, high signal-to-noise ratio spectra the abundances of the elements La and Eu have been determined over the stellar metallicity range -3<[Fe/H]<+0.3 in 159 giant and dwarf stars. Lanthanum is predominantly made by the s-process in the solar system, while Eu owes most of its solar system abundance to the r-process. The changing ratio of these elements in stars over a wide metallicity range traces the changing contributions of these two processes to the Galactic abundance mix. Large s-process abundances can be the result of mass transfer from very evolved stars, so to identify these cases, we also report carbon abundances in our metal-poor stars. Results indicate that the s-process may be active as early as [Fe/H]=-2.6, alalthough we also find that some stars as metal-rich as [Fe/H]=-1 show no strong indication of s-process enrichment. There is a significant spread in the level of s-process enrichment even at solar metallicity.Comment: 64 pages, 15 figures; ApJ 2004 in pres

Assessing The Validity Of A Culturally Modified Drinking Motives Questionnaire For Use In Aboriginal Communities

Alcohol related harms disproportionately affect Aboriginal people in Australia. Motives to drink have been identified as the most proximal factor to alcohol consumption.The aim of this study is to assess the validity of a culturally modified Drinking Motives Questionnaire-Revised (DMQ-R) (Cooper, 1994) with Aboriginal participants. The study was cross sectional, utilising data collected via face-to-face surveys with a sample of adult Aboriginal participants. A convenience sample of 135 Aboriginal men (n=41) and women (n=94) from the Pilbara Region of Western Australia, who had consumed alcohol in the preceding 12 months. The Culturally modified DMQ-R (CDMQ-R) developed in consultation with Aboriginal community researchers and a local Aboriginal Community Reference Group was the primary outcome measure for this study. Confirmatory Factor Analysis indicated the four-factor model of drinking motives as measured by a culturally modified DMQ-R was valid for use with Aboriginal people of the Pilbara region. While most items loaded on the factor solution as hypothesised, there were some minor discrepancies which suggest further modification may be needed. In addition, the reduction of the original five-point scale to a three-point scale created statistical challenges. Future research might seek to further refine the DMQ-R for this population and determine an appropriate method for expanding the response scale incorporating advice from Aboriginal people

Differential Brain Activation to Angry Faces by Elite Warfighters: Neural Processing Evidence for Enhanced Threat Detection

10.1371/journal.pone.0010096PLoS ONE54

Cryo-EM structure of the Rous sarcoma virus octameric cleaved synaptic complex intasome

Despite conserved catalytic integration mechanisms, retroviral intasomes composed of integrase (IN) and viral DNA possess diverse structures with variable numbers of IN subunits. To investigate intasome assembly mechanisms, we employed the Rous sarcoma virus (RSV) IN dimer that assembles a precursor tetrameric structure in transit to the mature octameric intasome. We determined the structure of RSV octameric intasome stabilized by a HIV-1 IN strand transfer inhibitor using single particle cryo-electron microscopy. The structure revealed significant flexibility of the two non-catalytic distal IN dimers along with previously unrecognized movement of the conserved intasome core, suggesting ordered conformational transitions between intermediates that may be important to capture the target DNA. Single amino acid substitutions within the IN C-terminal domain affected intasome assembly and function in vitro and infectivity of pseudotyped RSV virions. Unexpectedly, 17 C-terminal amino acids of IN were dispensable for virus infection despite regulating the transition of the tetrameric intasome to the octameric form in vitro. We speculate that this region may regulate the binding of highly flexible distal IN dimers to the intasome core to form the octameric complex. Our studies reveal key steps in the assembly of RSV intasomes

The Chemical Composition and Age of the Metal-Poor Halo Star BD +17^\circ 3248

We have combined new high-resolution spectra obtained with the Hubble Space Telescope (HST) and ground-based facilities to make a comprehensive new abundance analysis of the metal-poor, halo star BD +17^\circ 3248. We have detected the third r-process peak elements osmium, platinum, and (for the first time in a metal-poor star) gold, elements whose abundances can only be reliably determined using HST. Our observations illustrate a pattern seen in other similar halo stars with the abundances of the heavier neutron-capture elements, including the third r-process peak elements, consistent with a scaled solar system r-process distribution. The abundances of the lighter neutron-capture elements, including germanium and silver, fall below that same scaled solar r-process curve, a result similar to that seen in the ultra-metal-poor star CS 22892--052. A single site with two regimes or sets of conditions, or perhaps two different sites for the lighter and heavier neutron-capture elements, might explain the abundance pattern seen in this star. In addition we have derived a reliable abundance for the radioactive element thorium. We tentatively identify U II at 3859 A in the spectrum of BD +17^\circ 3248, which makes this the second detection of uranium in a very metal-poor halo star. Our combined observations cover the widest range in proton number (from germanium to uranium) thus far of neutron-capture elements in metal-poor Galactic halo stars. Employing the thorium and uranium abundances in comparison with each other and with several stable elements, we determine an average cosmochronological age for BD +17^\circ 3248 of 13.8 +/- 4 Gyr, consistent with that found for other similar metal-poor halo stars.Comment: 58 pages, 4 tables, 11 figures; To appear in ApJ Typo correcte