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https://www.readbyqxmd.com/read/28821587/drift-induced-selection-between-male-and-female-heterogamety
#1
Carl Veller, Pavitra Muralidhar, George W A Constable, Martin A Nowak
Evolutionary transitions between male and female heterogamety are common in both vertebrates and invertebrates. Theoretical studies of these transitions have found that, when all genotypes are equally fit, continuous paths of intermediate equilibria link the two sex chromosome systems. This observation has led to a belief that neutral evolution along these paths can drive transitions, and that arbitrarily small fitness differences among sex chromosome genotypes can determine the system to which evolution leads...
August 16, 2017: Genetics
https://www.readbyqxmd.com/read/28821382/sex-linked-behavior-evolution-stability-and-variability
#2
REVIEW
Cordelia Fine, John Dupré, Daphna Joel
Common understanding of human sex-linked behaviors is that proximal mechanisms of genetic and hormonal sex, ultimately shaped by the differential reproductive challenges of ancestral males and females, act on the brain to transfer sex-linked predispositions across generations. Here, we extend the debate on the role of nature and nurture in the development of traits in the lifetime of an individual, to their role in the cross-generation transfer of traits. Advances in evolutionary theory that posit the environment as a source of trans-generational stability, and new understanding of sex effects on the brain, suggest that the cross-generation stability of sex-linked patterns of behavior are sometimes better explained in terms of inherited socioenvironmental conditions, with biological sex fostering intrageneration variability...
July 29, 2017: Trends in Cognitive Sciences
https://www.readbyqxmd.com/read/28821346/sex-linked-behavior-evolution-stability-and-variability
#3
REVIEW
Cordelia Fine, John Dupré, Daphna Joel
Common understanding of human sex-linked behaviors is that proximal mechanisms of genetic and hormonal sex, ultimately shaped by the differential reproductive challenges of ancestral males and females, act on the brain to transfer sex-linked predispositions across generations. Here, we extend the debate on the role of nature and nurture in the development of traits in the lifetime of an individual, to their role in the cross-generation transfer of traits. Advances in evolutionary theory that posit the environment as a source of trans-generational stability, and new understanding of sex effects on the brain, suggest that the cross-generation stability of sex-linked patterns of behavior are sometimes better explained in terms of inherited socioenvironmental conditions, with biological sex fostering intrageneration variability...
September 2017: Trends in Cognitive Sciences
https://www.readbyqxmd.com/read/28815964/sex-biased-dispersal-of-human-ancestors
#4
Yukimaru Sugiyama
Some anthropologists and primatologists have argued that, judging by extant chimpanzees and humans, which are female-biased dispersers, the common ancestors of humans and chimpanzees were also female-biased dispersers. It has been thought that sex-biased dispersal patterns have been genetically transmitted for millions of years. However, this character has changed many times with changes in environment and life-form during human evolution and historical times. I examined life-form and social organization of nonhuman primates, among them gatherers (foragers), hunter-gatherers, agriculturalists, industrialists, and modern and extant humans...
July 2017: Evolutionary Anthropology
https://www.readbyqxmd.com/read/28812713/female-plasticity-tends-to-reduce-sexual-conflict
#5
David V McLeod, Troy Day
Sexual conflict is the divergence of evolutionary interests between the sexes. A neglected aspect of sexual conflict theory is that the conflict often occurs within the female's body, which can lead to a power asymmetry between the sexes. In particular, the female may often be able to respond flexibly to the actions of the male, and so exhibits plasticity. Here, we consider the implications of female plasticity, and find that it tends to result in lower levels of sexual conflict. We then relate our results to a comparison of pre- versus post-copulatory sexual conflict, and we also show that this asymmetry between males and females reduces the likelihood of runaway selection, preventing co-evolutionary arms races...
February 13, 2017: Nature ecology & evolution
https://www.readbyqxmd.com/read/28811876/individual-quality-and-age-but-not-environmental-or-social-conditions-modulate-costs-of-reproduction-in-a-capital-breeder
#6
Lucie Debeffe, Jocelyn Poissant, Philip D McLoughlin
Costs associated with reproduction are widely known to play a role in the evolution of reproductive tactics with consequences to population and eco-evolutionary dynamics. Evaluating these costs as they pertain to species in the wild remains an important goal of evolutionary ecology. Individual heterogeneity, including differences in individual quality (i.e., among-individual differences in traits associated with survival and reproduction) or state, and variation in environmental and social conditions can modulate the costs of reproduction; however, few studies have considered effects of these factors simultaneously...
August 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28811564/computational-identification-of-y-linked-markers-and-genes-in-the-grass-carp-genome-by-using-a-pool-and-sequence-method
#7
Aidi Zhang, Rong Huang, Liangming Chen, Lv Xiong, Libo He, Yongming Li, Lanjie Liao, Zuoyan Zhu, Yaping Wang
The molecular analysis of sex in vertebrates is important, as it has the potential to provide vital information for theoretical and applied research alike. Teleost fish are the ancient vertebrates that present a broad sex chromosome system but lack differentiated sex chromosomes in most species. Hence understanding the sex in fish would not only illuminate the sex determination evolution in vertebrates but also shed light on fish farming. In the present study, we used grass carp as a teleost fish model, studied the Y chromosome by using a pool-and-sequence strategy in combination with fragment-ratio method...
August 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28811388/hill-robertson-interference-reduces-genetic-diversity-on-a-young-plant-y-chromosome
#8
Josh Hough, Wei Wang, Spencer C H Barrett, Stephen I Wright
X and Y chromosomes differ in effective population size (Ne ), rates of recombination, and exposure to natural selection, all of which can affect patterns of genetic diversity. On Y chromosomes with suppressed recombination, natural selection is expected to eliminate linked neutral variation and lower the Ne of Y compared to X chromosomes or autosomes. However, female-biased sex ratios and high variance in male reproductive success can also reduce Y-linked Ne , making it difficult to infer the causes of low Y-diversity...
August 15, 2017: Genetics
https://www.readbyqxmd.com/read/28810869/-evolution-and-financial-cost-of-socioeconomic-inequalities-in-ambulatory-care-sensitive-conditions-an-ecological-study-for-portugal-2000-2014
#9
Klára Dimitrovová, Cláudia Costa, Paula Santana, Julian Perelman
BACKGROUND: Hospitalizations for Ambulatory Care Sensitive Conditions (ACSC) are specific conditions for which hospitalization is thought to be avoidable through patient education, health promotion initiatives, early diagnosis and by appropriate chronic disease management, and have been shown to be greatly influenced by socioeconomic (SE) characteristics. We examined the SE inequalities in hospitalization rates for ACSC in Portugal, their evolution over time (2000-2014), and their associated financial burden...
August 16, 2017: International Journal for Equity in Health
https://www.readbyqxmd.com/read/28810709/parallel-evolution-of-sperm-hyper-activation-ca2-channels
#10
Jacob C Cooper, Nitin Phadnis
Sperm hyper-activation is a dramatic change in sperm behavior where mature sperm burst into a final sprint in the race to the egg. The mechanism of sperm hyper-activation in many metazoans, including humans, consists of a jolt of Ca2+ into the sperm flagellum via CatSper ion channels. Surprisingly, all nine CatSper genes have been independently lost in several animal lineages. In Drosophila, sperm hyper-activation is performed through the cooption of the polycystic kidney disease 2 (pkd2) Ca2+ channel. The parallels between CatSpers in primates and pkd2 in Drosophila provide a unique opportunity to examine the molecular evolution of the sperm hyper-activation machinery in two independent, nonhomologous calcium channels separated by > 500 million years of divergence...
July 1, 2017: Genome Biology and Evolution
https://www.readbyqxmd.com/read/28808545/dioecious-plants-are-more-precocious-than-cosexual-plants-a-comparative-study-of-relative-sizes-at-the-onset-of-sexual-reproduction-in-woody-species
#11
Itsuki Ohya, Satoshi Nanami, Akira Itoh
The reproductive capacities of dioecious plant species may be limited by severe pollen limitation and narrow seed shadows for the two reasons. First, they are unable to self-pollinate, and seed production occurs only with pollinator movement from males to females. Second, only 50% of the individuals in populations contribute to seed production. Despite these handicaps, dioecious plants maintain their populations in plant communities with cooccurring cosexual plants, and no substantial difference in population growth rates has been found between dioecious and cosexual plants...
August 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28806376/classification-of-the-residual-cranial-defects-and-selection-of-reconstruction-materials
#12
Nanda Kishore Sahoo, Mohan Rangan N, Kapil Tomar, Sudarshan Bhat
The cranial defects are complex in nature and are due to various causes. Therefore, there is a need for a common term of reference to these defects. This requirement stood as a prime reason for proposing a classification system for cranial defects. The classification is based on 2 decades of experience in cranioplasty. This efficient and simple way of representation would fill the existing lacunae for a systematic communication on cranial defects. Over the ages the evolution of reconstruction and grafting had undergone a massive progress...
August 10, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28804140/vertebrate-sex-determination-evolutionary-plasticity-of-a-fundamental-switch
#13
REVIEW
Blanche Capel
The discovery of the Sry gene in 1990 triggered a revolution in our understanding of sex determination. More recently, advances in non-model organisms have been fuelled by the rapid evolution of affordable genome and transcriptome technologies. This Review considers the unusual plasticity in the bipotential system of sex determination and some of the diverse mechanisms that have evolved to control this critical developmental decision, including strong genetic pathways, environmental influences and epigenetic regulation...
August 14, 2017: Nature Reviews. Genetics
https://www.readbyqxmd.com/read/28798882/evolution-of-orofacial-symptoms-and-disease-progression-in-idiopathic-parkinson-s-disease-longitudinal-data-from-the-j%C3%A3-nk%C3%A3-ping-parkinson-registry
#14
Seyed-Mohammad Fereshtehnejad, Örjan Skogar, Johan Lökk
BACKGROUND: Orofacial symptoms are common in Parkinson's disease (PD) both as initial manifestations and late markers of disease complications. We aimed to investigate the evolution of orofacial manifestations and their prognostic value throughout PD progression. METHODS: Data was obtained from "Jönköping Parkinson Registry" database on routine care visits of 314 people with idiopathic PD in southern Sweden. Information on baseline symptomatology, orofacial features, UPDRS, and medications was recorded at baseline and during each follow-up visit within an average of 4...
2017: Parkinson's Disease
https://www.readbyqxmd.com/read/28798399/sexual-conflict-and-the-evolution-of-genitalia-male-damselflies-remove-more-sperm-when-mating-with-a-heterospecific-female
#15
Adolfo Cordero-Rivera
In Calopteryx damselflies, males remove rivals' sperm stored by the female, thereby reducing sperm competition. This behaviour may create a sexual conflict, because females could lose the sperm stored in the spermatheca, used for long-term storage. Comparative evidence suggested antagonistic coevolution between sexes, which might prompt the evolution of narrow spermathecal ducts, or longer spermathecae, hindering sperm removal. Calopteryx haemorrhoidalis and C. splendens coexist and sometimes hybridize. Therefore, here I predicted that if females coevolve with conspecific males, heterospecific males should have an advantage when interspecific matings occur because females will show less resistance to them than to conspecific males...
August 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28796902/spatio-temporal-variation-in-lifelong-telomere-dynamics-in-a-long-term-ecological-study
#16
Lewis G Spurgin, Kat Bebbington, Eleanor A Fairfield, Martijn Hammers, Jan Komdeur, Terry Burke, Hannah L Dugdale, David S Richardson
Understanding individual-level variation in response to the environment is fundamental to understanding life-history evolution and population dynamics. Telomeres, the protective caps at the ends of chromosomes, shorten in response to oxidative stress, and telomere shortening is correlated with reduced survival and lifespan. Investigating telomere dynamics may help us quantify individual variation in the costs experienced from social and ecological factors, and enhance our understanding of the dynamics of natural populations...
August 10, 2017: Journal of Animal Ecology
https://www.readbyqxmd.com/read/28795468/patient-safety-on-psychiatric-wards-a-cross-sectional-multilevel-study-of-factors-influencing-nurses-willingness-to-share-power-and-responsibility-with-patients
#17
Joeri Vandewalle, Simon Malfait, Kristof Eeckloo, Roos Colman, Dimitri Beeckman, Sofie Verhaeghe, Ann Van Hecke
The World Health Organization highlights the need for more patient participation in patient safety. In mental health care, psychiatric nurses are in a frontline position to support this evolution. The aim of the present study was to investigate the demographic and contextual factors that influence the willingness of psychiatric nurses to share power and responsibility with patients concerning patient safety. The patient participation culture tool for inpatient psychiatric wards was completed by 705 nurses employed in 173 psychiatric wards within 37 hospitals...
August 9, 2017: International Journal of Mental Health Nursing
https://www.readbyqxmd.com/read/28794047/no-substantial-evidence-for-sexual-transmission-of-minority-hiv-drug-resistance-mutations-in-men-who-have-sex-with-men
#18
Antoine Chaillon, Masato Nakazawa, Joel O Wertheim, Susan J Little, Davey M Smith, Sanjay R Mehta, Sara Gianella
During primary HIV-infection, the presence of minority drug resistant mutations (DRM) may be a consequence of sexual transmission, de novo mutations or technical errors. Baseline blood samples were collected from 24 HIV-infected antiretroviral-naive, genetically- and epidemiologically- linked source and recipient partners, shortly after the recipient's estimated date of infection. An additional 32 longitudinal samples were available from 11 recipients. Deep-sequencing of HIV reverse transcriptase (RT) was performed (Roche/454) and screened for nucleoside and non-nucleoside RT inhibitor DRM...
August 9, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28793262/adaptive-evolution-of-gene-expression-in-drosophila
#19
Armita Nourmohammad, Joachim Rambeau, Torsten Held, Viera Kovacova, Johannes Berg, Michael Lässig
Gene expression levels are important quantitative traits that link genotypes to molecular functions and fitness. In Drosophila, population-genetic studies have revealed substantial adaptive evolution at the genomic level, but the evolutionary modes of gene expression remain controversial. Here, we present evidence that adaptation dominates the evolution of gene expression levels in flies. We show that 64% of the observed expression divergence across seven Drosophila species are adaptive changes driven by directional selection...
August 8, 2017: Cell Reports
https://www.readbyqxmd.com/read/28793089/-evolution-in-the-use-and-the-expenditures-of-a-healthcare-provider
#20
André Luís de Castro Moura Duarte, Felippe de Medeiros Oliveira, Anderson de Andrade Santos, Bento Fortunato Cardoso Dos Santos
Brazil's aging population and the rising number of people reliant upon the country's supplementary healthcare system have elicited the concern of public and private managers regarding the increase in healthcare costs. In this paper, the costs per gender, per type of medical expenses and per age group of a major Brazilian self-managed healthcare provider between 2007 and 2013 were analyzed. This healthcare provider is of interest because, besides portraying a single condition of revenue growth restricted to the existing contributors, it also replicates the demographic profile expected for Brazil in 2050, when approximately one-third of its population will be over 60 years of age...
August 2017: Ciência & Saúde Coletiva
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