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https://www.readbyqxmd.com/read/27911018/sperm-competition-and-the-evolution-of-precopulatory-weapons-testis-size-and-amplexus-position-but-not-arm-strength-affect-fertilization-success-in-a-chorusing-frog
#1
Bruno A Buzatto, Evan M Thyer, J Dale Roberts, Leigh W Simmons
Trade-offs between pre- and postcopulatory traits influence their evolution, and male expenditure on such traits is predicted to depend on the number of competitors, the benefits from investing in weapons, and the risk and intensity of sperm competition. Males of the chorusing frog Crinia georgiana use their arms as weapons in contest competition. Previously, we showed that increased numbers of rivals elevated the risk and intensity of sperm competition due to multimale amplexus, and caused a reversal in the direction of precopulatory selection on arm girth...
December 2, 2016: Evolution; International Journal of Organic Evolution
https://www.readbyqxmd.com/read/27908942/the-need-for-an-effective-process-to-resolve-conflicts-over-medical-futility-a-case-study-and-analysis
#2
Jocelyn A Olmstead, Michael D Dahnke
The issue of medical futility requires a well-defined process in which both sides of the dispute can be heard and a resolution reached in a fair and ethical manner. Procedural approaches to medical futility cases provide all parties involved with a process-driven framework for resolving these disputes. Medical paternalism or the belief in the absolute rightness of the medical model will not serve to resolve these disputes. Although medical futility is first determined by medicine, in order for the determination to meet legal criteria, it must be subject to review...
December 2016: Critical Care Nurse
https://www.readbyqxmd.com/read/27862580/correlated-paternity-measures-mate-monopolization-and-scales-with-the-magnitude-of-sexual-selection
#3
Marcel E Dorken, L E Perry
Indirect measures of sexual selection have been criticized because they can overestimate the magnitude of selection. In particular, they do not account for the degree to which mating opportunities can be monopolized by individuals of the sex that compete for mates. We introduce a measure of mate monopolization (m) based on the magnitude of correlated paternity and evaluate its ability to track changes in the magnitude of sexual selection. Simulation models were used to compare how well m tracked changes in the selection differential (s) for a trait regulating mating success...
November 14, 2016: Journal of Evolutionary Biology
https://www.readbyqxmd.com/read/27859860/constrained-evolution-of-the-sex-comb-in-drosophila-simulans
#4
Manar S Maraqa, Robert Griffin, M D Sharma, Alastair J Wilson, John Hunt, David J Hosken, Clarissa M House
Male fitness is dependent on sexual traits that influence mate acquisition (pre-copulatory sexual selection) and paternity (post-copulatory sexual selection), and while many studies have documented the form of selection in one or the other of these arenas, fewer have done it for both. Nonetheless, it appears that the dominant form of sexual selection is directional, although theoretically, populations should converge on peaks in the fitness surface, where selection is stabilizing. Many factors, however, can prevent populations from reaching adaptive peaks...
November 16, 2016: Journal of Evolutionary Biology
https://www.readbyqxmd.com/read/27859612/objectively-verified-parental-non-hip-major-osteoporotic-fractures-and-offspring-osteoporotic-fracture-risk-a-population-based-familial-linkage-study
#5
Shuman Yang, William D Leslie, Randy Walld, Leslie L Roos, Suzanne N Morin, Sumit R Majumdar, Lisa M Lix
Parental hip fracture (HF) is associated with increased risk of offspring major osteoporotic fractures (MOFs; comprising hip, forearm, clinical spine or humerus fracture). Whether other sites of parental fracture should be used for fracture risk assessment is uncertain. The current study tested the association between objectively-verified parental non-hip MOF and offspring incident MOF. Using population-based administrative healthcare data for the province of Manitoba, Canada, we identified 255,512 offspring with linkage to at least one parent (238,054 mothers and 209,423 fathers)...
November 10, 2016: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/27859596/osteosarcoma-in-a-patient-with-pseudohypoparathyroidism-type-1b-due-to-paternal-uniparental-disomy-of-chromosome-20q
#6
Hye-Sun Park, Chang Gon Kim, Namki Hong, Seok Joo Lee, Da Hea Seo, Yumie Rhee
It is assumed that a persistent high level of parathyroid hormone (PTH) might have a relation with bone malignancy. However, there has been no report of osteosarcoma associated with pseudohypoparathyroidism type 1b (PHP1b), which is accompanied by high PTH. PHP1b is the result of resistance to PTH in certain end-organ tissues, especially the kidney; the response in bone is unaffected because it normally expresses stimulatory G protein equally from both parental alleles. A 21-year-old male, presenting with gum swelling at the right mandible, was referred to a dental clinic...
November 18, 2016: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/27805265/impact-of-cryptic-female-choice-on-insemination-success-larger-sized-and-longer-copulating-male-squid-ejaculate-more-but-females-influence-insemination-success-by-removing-spermatangia
#7
Noriyosi Sato, Masa-Aki Yoshida, Takashi Kasugai
In polyandrous mating systems, sperm competition and cryptic female choice (CFC) are well recognised as post-copulatory evolutionary forces. However, it remains challenging to separate CFC from sperm competition and to estimate how much CFC influences insemination success because those processes usually occur inside the female's body. The Japanese pygmy squid, Idiosepius paradoxus, is an ideal species in which to separate CFC from sperm competition because sperm transfer by the male and sperm displacement by the female can be observed directly at an external location on the female's body...
November 2, 2016: Evolution; International Journal of Organic Evolution
https://www.readbyqxmd.com/read/27797412/prevalence-of-granulocyte-antibodies-in-never-allo-exposed-female-and-male-donors
#8
Rutger A Middelburg, Hans Vrielink, Leendert Porcelijn
BACKGROUND: Fetal/Neonatal alloimmune neutropenia (FNAIN) is a serious condition usually resulting from immunisation of the mother to paternally inherited neutrophil antigens of the foetus. Understanding the biology of female immunisation against neutrophils could help predict or prevent FNAIN. OBJECTIVES: To quantify differences in the prevalence of specific and pan-reactive granulocyte antibodies, between allo-exposed and never allo-exposed male and female blood donors...
October 31, 2016: European Journal of Haematology
https://www.readbyqxmd.com/read/27758066/the-colour-of-paternity-extra-pair-paternity-in-the-wild-gouldian-finch-does-not-appear-to-be-driven-by-genetic-incompatibility-between-morphs
#9
P E Bolton, L A Rollins, J Brazill-Boast, K-W Kim, T Burke, S C Griffith
In socially monogamous species, individuals can use extra-pair paternity and offspring sex allocation as adaptive strategies to ameliorate costs of genetic incompatibility with their partner. Previous studies on domesticated Gouldian finches (Erythrura gouldiae) demonstrated a genetic incompatibility between head colour morphs, the effects of which are more severe in female offspring. Domesticated females use differential sex allocation, and extra-pair paternity with males of compatible head colour, to reduce fitness costs associated with incompatibility in mixed-morph pairings...
October 18, 2016: Journal of Evolutionary Biology
https://www.readbyqxmd.com/read/27758054/devoted-fathers-or-selfish-lovers-conflict-between-mating-effort-and-parental-care-in-a-harem-defending-arachnid
#10
Louise M Alissa, Danilo G Muniz, Glauco Machado
When there is a temporal trade-off between mating effort and parental care, theoretical models predict that intense sexual selection on males leads to reduced paternal care. Thus, high-quality males should invest more in mating effort because they have higher chances of acquiring mates, whereas low-quality males should bias their investment toward parental care. Once paternal care has evolved, offspring value should also influence males' decisions to invest in offspring attendance. Here we performed a manipulation under field conditions to investigate the factors that influence male allocation in either mating effort or parental care...
October 18, 2016: Journal of Evolutionary Biology
https://www.readbyqxmd.com/read/27743766/genetic-variants-in-oxytocin-receptor-and-arginine-vasopressin-receptor-1a-are-associated-with-the-neural-correlates-of-maternal-and-paternal-affection-towards-their-child
#11
Shota Nishitani, Kazuya Ikematsu, Tsunehiko Takamura, Sumihisa Honda, Koh-Ichiro Yoshiura, Kazuyuki Shinohara
There is extensive evidence in animal studies, particularly in vole species (Microtus), that oxytocin (OT) receptor and arginine-vasopressin (AVP) receptor 1a is critical for the regulation of maternal and paternal behavior, respectively. Human studies have gained insight into the relationship between both hormone receptor gene variants and behavior, but not between the variants and the underlying brain activity. To study this, we investigated the association between neural activation of the anterior prefrontal cortex (APFC) in mothers and fathers in response to their child smiling video stimuli to induce the positive affect related to attachment with their child, and genetic variants of OT receptor (OXTR) and AVP receptor 1A (AVPR1A)...
October 13, 2016: Hormones and Behavior
https://www.readbyqxmd.com/read/27741552/adult-body-size-sexual-history-and-adolescent-sexual-development-may-predict-risk-of-developing-prostate-cancer-results-from-the-new-south-wales-lifestyle-and-evaluation-of-risk-study-clear
#12
Visalini Nair-Shalliker, Sarsha Yap, Carlos Nunez, Sam Egger, Jennifer Rodger, Manish I Patel, Dianne L O'Connell, Freddy Sitas, Bruce K Armstrong, David P Smith
Prostate cancer (PC) is the most common non-cutaneous cancer in men worldwide. The relationships between PC and possible risk factors for PC cases (n = 1,181) and male controls (n = 875) from the New South Wales (NSW) Cancer, Lifestyle and Evaluation of Risk Study (CLEAR) were examined in this study. The associations between PC risk and paternal history of PC, body mass index (BMI), medical conditions, sexual behaviour, balding pattern and puberty, after adjusting for age, income, region of birth, place of residence, and PSA testing, were examined...
October 14, 2016: International Journal of Cancer. Journal International du Cancer
https://www.readbyqxmd.com/read/27717090/how-the-truffle-got-its-mate-insights-from-genetic-structure-in-spontaneous-and-planted-mediterranean-populations-of-tuber-melanosporum
#13
E Taschen, F Rousset, M Sauve, L Benoit, M-P Dubois, F Richard, M-A Selosse
The life cycles and dispersal of edible fungi are still poorly known, thus limiting our understanding of their evolution and domestication. The prized Tuber melanosporum produces fruitbodies (fleshy organs where meiospores mature) gathered in natural, spontaneously inoculated forests or harvested in plantations of nursery-inoculated trees. Yet, how fruitbodies are formed remains unclear, thus limiting yields, and how current domestication attempts affect population genetic structure is overlooked. Fruitbodies result from mating between two haploid individuals: the maternal parent forms the flesh and the meiospores, while the paternal parent only contributes to the meiospores...
November 2016: Molecular Ecology
https://www.readbyqxmd.com/read/27714796/genomic-imprinting-disrupted-placental-expression-and-speciation
#14
Thomas D Brekke, Lindy A Henry, Jeffrey M Good
The importance of regulatory incompatibilities to the early stages of speciation remains unclear. Hybrid mammals often show extreme parent-of-origin growth effects that are thought to be a consequence of disrupted genetic imprinting (parent-specific epigenetic gene silencing) during early development. Here, we test the long-standing hypothesis that abnormal hybrid growth reflects disrupted gene expression due to loss of imprinting (LOI) in hybrid placentas, resulting in dosage imbalances between paternal growth factors and maternal growth repressors...
December 2016: Evolution; International Journal of Organic Evolution
https://www.readbyqxmd.com/read/27714783/mate-guarding-and-frequent-copulation-in-birds-a-meta-analysis-of-their-relationship-to-paternity-and-male-phenotype
#15
Anna M F Harts, Isobel Booksmythe, Michael D Jennions
In many birds, males are presumed to protect their paternity by closely guarding their mate or copulating frequently with her. Both these costly behaviors are assumed to reduce the risk and/or intensity of sperm competition. However, despite many studies on avian extra-pair paternity, it remains unclear how strongly these behaviors are related to fitness and other key life-history traits. Here, we conduct meta-analyses to address two questions. First, are mate guarding and/or frequent copulation positively correlated with a male's share of paternity at his nest? We find a significant positive correlation between both presumed paternity protection behaviors and paternity share...
October 7, 2016: Evolution; International Journal of Organic Evolution
https://www.readbyqxmd.com/read/27701793/11p15-icr1-partial-deletions-associated-with-igf2-h19-dmr-hypomethylation-and-silver-russell-syndrome
#16
Walid Abi Habib, Frederic Brioude, Salah Azzi, Jennifer Salem, Cristina Das Neves, Claire Personnier, Sandra Chantot-Bastaraud, Boris Keren, Yves Le Bouc, Madeleine Harbison, Irene Netchine
The 11p15 region harbors the IGF2/H19 imprinted domain, implicated in fetal and postnatal growth. Silver-Russell syndrome (SRS) is characterized by fetal and postnatal growth failure, and is caused principally by hypomethylation of the 11p15 imprinting control region 1 (ICR1). However, the mechanisms leading to ICR1 hypomethylation remain unknown. Maternally inherited genetic defects affecting the ICR1 domain have been associated with ICR1 hypermethylation and Beckwith-Wiedemann Syndrome (an overgrowth syndrome, the clinical and molecular mirror of SRS), and paternal deletions of IGF2 enhancers have been detected in four SRS patients...
October 4, 2016: Human Mutation
https://www.readbyqxmd.com/read/27668197/maternal-uterine-artery-doppler-in-the-first-and-second-trimesters-as-screening-method-for-hypertensive-disorders-and-adverse-perinatal-outcomes-in-low-risk-pregnancies
#17
Rosiane Maciel Scandiuzzi, Caio Antonio de Campos Prado, Edward Araujo Júnior, Geraldo Duarte, Silvana Maria Quintana, Fabrício da Silva Costa, Gabriele Tonni, Ricardo de Carvalho Cavalli, Alessandra Cristina Marcolin
OBJECTIVE: To assess the maternal demographic characteristics and uterine artery (UA) Doppler parameters at first and second trimesters of pregnancy as predictors for hypertensive disorders (HDs) and adverse perinatal outcomes. METHODS: This prospective cohort study comprised 162 singleton low-risk women undergoing routine antenatal care. The left and right UA were assessed by color and pulsed Doppler and the mean pulsatility and resistance indices as well as the presence of a bilateral protodiastolic notch were recorded at 11 to 14 and 20 to 24 weeks' gestation...
September 2016: Obstetrics & Gynecology Science
https://www.readbyqxmd.com/read/27639174/spacial-and-temporal-paterns-of-gene-expression-after-cardiac-mek1-gene-transfer-improve-post-infarction-remodeling-without-inducing-global-hypertrophy
#18
Yanying Fan, Yi-Lin Yang, Che-Chung Yeh, Michael J Mann
Alteration of mitogen activated protein (MAP) kinase signaling in transgenic mice can ameliorate post-myocardial infarction (MI) remodeling. However, pre-existing changes in transgenic hearts and clinically unrealistic transgene expression likely affect the response to injury; it is unknown whether clinically relevant induction of transgene expression in an otherwise normal heart can yield similar benefits. Constitutively active MEK1 (aMEK1) or LacZ adeno-associated virus 9 (AAV9) vectors were injected into the left ventricular (LV) chambers of mice either just before or after coronary ligation...
September 17, 2016: Journal of Cellular Biochemistry
https://www.readbyqxmd.com/read/27553422/parental-origin-of-the-deletion-del-20q-in-shwachman-diamond-patients-and-loss-of-the-paternally-derived-allele-of-the-imprinted-l3mbtl1-gene
#19
Lucia Nacci, Roberto Valli, Rita Maria Pinto, Marco Zecca, Marco Cipolli, Jacopo Morini, Simone Cesaro, Emanuela Boveri, Vittorio Rosti, Paola Corti, Maura Ambroni, Francesco Pasquali, Cesare Danesino, Emanuela Maserati, Antonella Minelli
Shwachman-Diamond syndrome (SDS) (OMIM 260400) is a rare autosomal recessive disease characterized by exocrine pancreatic insufficiency, skeletal, and hematological abnormalities and bone marrow (BM) dysfunction. Mutations in the SBDS gene cause SDS. Clonal chromosome anomalies are often present in BM, i(7)(q10) and del(20q) being the most frequent ones. We collected 6 SDS cases with del(20q): a cluster of imprinted genes, including L3MBTL1 and SGK2 is present in the deleted region. Only the paternal allele is expressed for these genes...
January 2017: Genes, Chromosomes & Cancer
https://www.readbyqxmd.com/read/27506899/fetal-programming-of-blood-pressure-in-a-transgenic-mouse-model-of-altered-intrauterine-environment
#20
Giuseppe Chiossi, Maged M Costantine, Esther Tamayo, Gary D V Hankins, George R Saade, Monica Longo
KEY POINTS: Nitric oxide is essential in the vascular adaptation to pregnancy, as knockout mice lacking nitric oxide synthase (NOS3) have abnormal utero-placental perfusion, hypertension and growth restriction. We previously showed with ex vivo studies on transgenic animals lacking NOS3 that adverse intrauterine environment alters fetal programming of vascular reactivity in adult offspring. The current research shows that altered vascular reactivity correlates with higher blood pressure in vivo...
December 1, 2016: Journal of Physiology
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