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Sex evolution

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https://www.readbyqxmd.com/read/29040151/sex-differences-in-vascular-reactivity-to-angiotensin-ii-during-the-evolution-of-myocardial-infarction
#1
Flores-Monroy Jazmín, Ramirez-Hernández Diana, Samano-Hernández Citali, Lezama-Martínez Diego, Sampieri-Cabrera Raul, Martínez-Aguilar Luisa
The influence of sex on the vascular response during the progression of myocardial infarction (MI) has not been extensively studied. In this work, we analyzed the differences of the vasoconstriction-induced by angiotensin II (Ang II) in the absence and presence of valsartan (200 nM) on the aortic rings of male and female Wistar rats at 2, 4, 24, and 48 h and 1, 2, 3, and 4 weeks after induction of MI. In the aortic rings of males an increase was observed in the contractile response that lasts up to 4 weeks; on females, this effect is diminished since 48 h until reaching sham group values at 2 weeks of coronary occlusion...
September 29, 2017: Journal of Cardiovascular Pharmacology
https://www.readbyqxmd.com/read/29036698/chromosomal-context-affects-the-molecular-evolution-of-sex-linked-genes-and-their-autosomal-counterparts-in-turtles-and-other-vertebrates
#2
Srihari Radhakrishnan, Nicole Valenzuela
Sex chromosomes evolve differently from autosomes because natural selection acts distinctly on them given their reduced recombination and smaller population size. Various studies of sex-linked genes compared to different autosomal genes within species support these predictions. Instead, here we take a novel alternative approach comparing the rate of evolution between subsets of genes that are sex-linked in selected reptiles/vertebrates and the same genes located in autosomes in other amniotes. We report for the first time the faster evolution of Z-linked genes in a turtle (the Chinese soft-shell turtle Pelodiscus sinensis) relative to autosomal orthologs in other taxa, including turtles with temperature-dependent sex determination (TSD)...
September 27, 2017: Journal of Heredity
https://www.readbyqxmd.com/read/29036644/roles-of-female-and-male-genotype-in-post-mating-responses-in-drosophila-melanogaster-roles-of-female-and-male-genotype-in-female-drosophila-melanogaster-transcriptional-physiological-and-behavioral-responses-to-mating
#3
Sofie Y N Delbare, Clement Y Chow, Mariana F Wolfner, Andrew G Clark
Mating induces a multitude of changes in female behavior, physiology and gene expression. Interactions between female and male genotype lead to variation in post-mating phenotypes and reproductive success. So far, few female molecules responsible for these interactions have been identified. Here, we used Drosophila melanogaster from five geographically dispersed populations to investigate such female x male genotypic interactions at the female transcriptomic and phenotypic levels. Females from each line were singly-mated to males from the same five lines, for a total of 25 combinations...
October 4, 2017: Journal of Heredity
https://www.readbyqxmd.com/read/29036624/genomic-signatures-of-sexual-conflict
#4
Katja R Kasimatis, Thomas C Nelson, Patrick C Phillips
Sexual conflict is a specific class of intergenomic conflict that describes the reciprocal sex-specific fitness costs generated by antagonistic reproductive interactions. The potential for sexual conflict is an inherent property of having a shared genome between the sexes and therefore is an extreme form of an environment-dependent fitness effect. In this way, many of the predictions from environment-dependent selection can be used to formulate expected patterns of whole-genome evolution under sexual conflict...
September 27, 2017: Journal of Heredity
https://www.readbyqxmd.com/read/29036451/genetic-mapping-and-phylogenetic-analysis-reveal-intraspecific-variation-in-sex-chromosomes-of-the-virginian-strawberry
#5
Na Wei, Rajanikanth Govindarajulu, Jacob A Tennessen, Aaron Liston, Tia-Lynn Ashman
With their extraordinary diversity in sexual systems, flowering plants offer unparalleled opportunities to understand sex determination and to reveal generalities in the evolution of sex chromosomes. Comparative genetic mapping of related taxa with good phylogenetic resolution can delineate the extent of sex chromosome diversity within plant groups, and lead the way to understanding the evolutionary drivers of such diversity. The North American octoploid wild strawberries provide such an opportunity. We performed linkage mapping using targeted sequence capture for the subdioecious western Fragaria virginiana ssp...
September 27, 2017: Journal of Heredity
https://www.readbyqxmd.com/read/29036352/environmental-plasticity-in-the-intersexual-correlation-and-sex-bias-of-gene-expression
#6
Changde Cheng, Mark Kirkpatrick
Intersexual genetic correlations are expected to constrain the evolution of sexual dimorphic traits, including the degree of sex-biased gene expression. Consistent with that expectation, studies in fruit flies and birds have reported that genes whose expression has a strong intersexual genetic correlation (rMF) show a lower level of sex-biased expression (SBE). However, it is known that both rMF and SBE can be affected by the environment. It is therefore unclear whether there is a consistent relationship between these two quantities across multiple environments...
September 27, 2017: Journal of Heredity
https://www.readbyqxmd.com/read/29035940/perspectives-on-hypertension-s-prevalence-treatment-and-control-in-a-high-cardiovascular-risk-east-european-country-data-from-the-sephar-iii-survey
#7
Maria Dorobantu, Oana-Florentina Tautu, Doina Dimulescu, Crina Sinescu, Paul Gusbeth-Tatomir, Catalina Arsenescu-Gerogescu, Florin Mitu, Daniel Lighezan, Calin Pop, Katalin Babes, Alina Giuca, Ileana Branza, Mihaela Udrescu, Valeria Herdea, Roxana Darabont
OBJECTIVES: To estimate the trend in arterial hypertension's prevalence, awareness, treatment, and control in Romania, starting from the latest national survey Study for the Evaluation of Prevalence of Hypertension and Cardiovascular Risk in Romania III that has a crucial importance for the development of prevention strategies at national level. METHODS: A representative sample of 1970 Romanian adults (mean age 48.38 years, age range 18-80 years, 52.5% women, 72...
October 13, 2017: Journal of Hypertension
https://www.readbyqxmd.com/read/29031530/human-torque-is-not-present-in-chimpanzee-brain
#8
X Li, T J Crow, W D Hopkins, Q Gong, N Roberts
We searched for positional brain surface asymmetries measured as displacements between corresponding vertex pairs in relation to a mid-sagittal plane in Magnetic Resonance (MR) images of the brains of 223 humans and 70 chimpanzees. In humans deviations from symmetry were observed: 1) a Torque pattern comprising right-frontal and left-occipital "petalia" together with downward and rightward "bending" of the occipital extremity, 2) leftward displacement of the anterior temporal lobe and superior temporal sulcus (STS), and 3) posteriorly in the position of left occipito-temporal surface accompanied by a clockwise rotation of the left Sylvian Fissure around the left-right axis...
October 11, 2017: NeuroImage
https://www.readbyqxmd.com/read/29030415/comorbidity-and-outcomes-in-traumatic-brain-injury-protocol-for-a-systematic-review-on-functional-status-and-risk-of-death
#9
Tatyana Mollayeva, Chen Xiong, Sara Hanafy, Vincy Chan, Zheng Jing Hu, Mitchell Sutton, Michael Escobar, Angela Colantonio
INTRODUCTION: Reports on the association between comorbidity and functional status and risk of death in patients with traumatic brain injury (TBI) have been inconsistent; it is currently unknown which additional clinical entities (comorbidities) have an adverse influence on the evolution of outcomes across the lifespan of men and women with TBI. The current protocol outlines a strategy for a systematic review of the current evidence examining the impact of comorbidity on functional status and early-term and late-term mortality, taking into account known risk factors of these adverse outcomes (ie, demographic (age and sex) and injury-related characteristics)...
October 13, 2017: BMJ Open
https://www.readbyqxmd.com/read/29024132/expression-of-isotocin-is-male-specifically-upregulated-by-gonadal-androgen-in-the-medaka-brain
#10
Junpei Yamashita, Yukika Kawabata, Kataaki Okubo
Oxytocin, a mammalian neuropeptide primarily synthesized in the supraoptic and paraventricular nuclei of the hypothalamus, mediates a variety of physiological and behavioral processes ranging from parturition and lactation to affiliation and prosociality. Multiple studies in rodents have shown that the expression of the oxytocin gene (Oxt) is stimulated by estrogen, while androgen has no apparent effect. However, this finding is not consistent across all studies, and no study has examined sex steroid regulation of Oxt or its orthologs in other animals...
October 10, 2017: Journal of Neuroendocrinology
https://www.readbyqxmd.com/read/29022726/common-marmoset-callithrix-jacchus-personality
#11
Sonja E Koski, Hannah M Buchanan-Smith, Hayley Ash, Judith M Burkart, Thomas Bugnyar, Alexander Weiss
Increasing evidence suggests that personality structure differs between species, but the evolutionary reasons for this variation are not fully understood. We built on earlier research on New World monkeys to further elucidate the evolution of personality structure in primates. We therefore examined personality in 100 family-reared adult common marmosets (Callithrix jacchus) from 3 colonies on a 60-item questionnaire. Principal components analyses revealed 5 domains that were largely similar to those found in a previous study on captive, ex-pet, or formerly laboratory-housed marmosets that were housed in a sanctuary...
October 12, 2017: Journal of Comparative Psychology
https://www.readbyqxmd.com/read/29021279/long-term-fragility-of-y-chromosomes-is-dominated-by-short-term-resolution-of-sexual-antagonism
#12
Heath Blackmon, Yaniv Brandvain
The evolution of heteromorphic sex chromosomes has fascinated biologists, inspiring theoretical models, experimental studies, and studies of genome structure. This work has produced a clear model, in which heteromorphic sex chromosomes result from repeated fixations of inversions (or other recombination suppression mechanisms) that tether sexually antagonistic alleles to sex-determining regions, followed by the degeneration of these regions induced by the lack of sex chromosome recombination in the heterogametic sex...
October 11, 2017: Genetics
https://www.readbyqxmd.com/read/29018291/multiple-geographical-origins-of-environmental-sex-determination-enhanced-the-diversification-of-darwin-s-favourite-orchids
#13
Oscar Alejandro Pérez-Escobar, Guillaume Chomicki, Fabien L Condamine, Jurriaan M de Vos, Aline C Martins, Eric C Smidt, Bente Klitgård, Günter Gerlach, Jochen Heinrichs
Environmental sex determination (ESD) - a change in sexual function during an individual life span driven by environmental cues - is an exceedingly rare sexual system among angiosperms. Because ESD can directly affect reproduction success, it could influence diversification rate as compared with lineages that have alternative reproductive systems. Here we test this hypothesis using a solid phylogenetic framework of Neotropical Catasetinae, the angiosperm lineage richest in taxa with ESD. We assess whether gains of ESD are associated with higher diversification rates compared to lineages with alternative systems while considering additional traits known to positively affect diversification rates in orchids...
October 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29017041/evolution-a-parthenogenetic-nematode-shows-how-animals-become-sexless
#14
Erich M Schwarz
Most animals have male and female sexes, implying that sex is ancient and beneficial; yet some have survived for millions of years without sex. The genome of the parthenogenetic nematode Diploscapter pachys gives clues as to how 'ancient asexual' animals can exist.
October 9, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28994887/hepatic-hydrothorax-about-a-hospital-serie-of-63-cases
#15
Leila Mouelhi, Oussama Daboussi, Nadia Cheffi, Kaouther El Jery, Yosra Said, Sana Khedher, Mohamed Salem, Radhouane Dabbèche, Fatma Houissa, Taoufik Najjar
BACKGROUND: Hepatic hydrothorax is a less common complication of cirrhosis with an estimated prevalence of 10- 15%. In the vast majority of cases, ascites are also present but significant pleural effusion may develop in patients without ascites. Hepatic hydrothorax is associated with cirrhosis whatever its etiology. The prognosis of hepatic hydrothorax remains unclear and is closely related to available therapeutic options. The aim of our study is to determine the prevalence of hydrothorax in cirrhotic patients, detail its clinical and therapeutic characteristics, and study the evolutive profile of cirrhotic patients with hydrothorax by comparing it to those without hydrothorax...
December 2016: La Tunisie Médicale
https://www.readbyqxmd.com/read/28994886/is-there-a-real-benefit-of-hyperbaric-oxygenotherapy-in-the-treatment-of-necrotizing-otitis-externa
#16
Ali Mardassi, Senda Turki, Rim Lahiani, Hajer Mbarek, Sonia Benzarti, Hédi Gharsallah
INTRODUCTION: Necrotizing otitis externa remains a severe and sometimes life-threatening disease in diabetic patient. Many therapeutic approaches have been described but what about the real benefit of hyperbaric oxygenotherapy in the management of this disease? METHODS: The authors reported a retrospective study about 42 patients treated for necrotizing external otitis over a period of 9 years (2006 to 2014). The patients were treated either by only antibiotherapy (23 cases) or with both antibiotherapy and hyperbaric oxygenotherapy (19 cases)...
December 2016: La Tunisie Médicale
https://www.readbyqxmd.com/read/28993654/ctenophore-relationships-and-their-placement-as-the-sister-group-to-all-other-animals
#17
Nathan V Whelan, Kevin M Kocot, Tatiana P Moroz, Krishanu Mukherjee, Peter Williams, Gustav Paulay, Leonid L Moroz, Kenneth M Halanych
Ctenophora, comprising approximately 200 described species, is an important lineage for understanding metazoan evolution and is of great ecological and economic importance. Ctenophore diversity includes species with unique colloblasts used for prey capture, smooth and striated muscles, benthic and pelagic lifestyles, and locomotion with ciliated paddles or muscular propulsion. However, the ancestral states of traits are debated and relationships among many lineages are unresolved. Here, using 27 newly sequenced ctenophore transcriptomes, publicly available data and methods to control systematic error, we establish the placement of Ctenophora as the sister group to all other animals and refine the phylogenetic relationships within ctenophores...
October 9, 2017: Nature ecology & evolution
https://www.readbyqxmd.com/read/28993493/timing-as-a-sexually-selected-trait-the-right-mate-at-the-right-moment
#18
REVIEW
Michaela Hau, Davide Dominoni, Stefania Casagrande, C Loren Buck, Gabriela Wagner, David Hazlerigg, Timothy Greives, Roelof A Hut
Sexual selection favours the expression of traits in one sex that attract members of the opposite sex for mating. The nature of sexually selected traits such as vocalization, colour and ornamentation, their fitness benefits as well as their costs have received ample attention in field and laboratory studies. However, sexually selected traits may not always be expressed: coloration and ornaments often follow a seasonal pattern and behaviours may be displayed only at specific times of the day. Despite the widely recognized differences in the daily and seasonal timing of traits and their consequences for reproductive success, the actions of sexual selection on the temporal organization of traits has received only scant attention...
November 19, 2017: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28992287/new-insights-into-the-evolution-of-the-w-chromosome-in-lepidoptera
#19
Martina Dalíková, Magda Zrzavá, Irena Hladová, Petr Nguyen, Ivan Šonský, Martina Flegrová, Svatava Kubícková, Anna Voleníková, Akito Y Kawahara, Ralph S Peters, František Marec
Moths and butterflies (Lepidoptera) represent the most diverse group of animals with heterogametic females. Although the vast majority of species has a WZ/ZZ (female/male) sex chromosome system, it is generally accepted that the ancestral system was Z/ZZ and the W chromosome has evolved in a common ancestor of Tischeriidae and Ditrysia. However, the lack of data on sex chromosomes in lower Lepidoptera has prevented a formal test of this hypothesis. Here, we performed a detailed analysis of sex chromosomes in Tischeria ekebladella (Tischeriidae) and 3 species representing lower Ditrysia, Cameraria ohridella (Gracillariidae), Plutella xylostella (Plutellidae), and Tineola bisselliella (Tineidae)...
July 18, 2017: Journal of Heredity
https://www.readbyqxmd.com/read/28990212/normal-development-of-the-corpus-callosum-and-evolution-of-corpus-callosum-sexual-dimorphism-in-infancy
#20
Chaw-Liang Chang, Nan-Chang Chiu, Yi-Chen Yang, Che-Sheng Ho, Kun-Long Hung
OBJECTIVES: The aim of this study was to establish reference ranges for the corpus callosum in infancy and to clarify how sexual dimorphism evolves between the fetal stage and infancy. METHODS: Normal sonograms from cerebral ultrasonographic examinations of 1- to 6-month-old healthy full-term infants were selected. The length and thickness of the corpus callosum were determined, and the effect of sex on these values was analyzed. Studies on corpus callosum sexual dimorphism were reviewed...
October 9, 2017: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
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