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https://www.readbyqxmd.com/read/28814516/baculovirus-molecular-evolution-via-gene-turnover-and-recurrent-positive-selection-of-key-genes
#1
Tom Hill, Robert L Unckless
Hosts and viruses are locked in an evolutionary arms race. Hosts are constantly evolving to suppress virulence and replication, while viruses, reliant on host machinery for survival and reproduction, develop counter-strategies to escape this immune defense. Viruses must also adapt to novel conditions when establishing themselves in a host species. Both processes provide strong selection for viral adaptation. Understanding adaptive evolution in insect viruses can help us better understand adaptive evolution in general, and is important due to their use as biocontrol agents, and for protecting ecologically or economically important species from outbreaks...
August 16, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28814372/association-of-cyp19a1-gene-polymorphisms-with-anoestrus-in-water-buffaloes
#2
Khairy M El-Bayomi, Ayman A Saleh, Ashraf Awad, Mahmoud S El-Tarabany, Hadeel S El-Qaliouby, Mohamed Afifi, Shymaa El-Komy, Walaa M Essawi, Essam A Almadaly, Mohammed A El-Magd
Cytochrome P450 aromatase (encoded by the CYP19A1 gene) regulates oestrogen biosynthesis and so plays an essential role in female fertility. We investigated the genetic association of CYP19A1 with the risk of anoestrus in Egyptian water buffaloes. A total of 651 animals (326 anoestrous and 325 cycling) were used in this case-control study. Using single-strand conformation polymorphisms and sequencing, four single nucleotide polymorphisms (SNPs) were detected; c.-135T>C SNP in the 5'UTR and three non-synonymous SNPs: c...
August 17, 2017: Reproduction, Fertility, and Development
https://www.readbyqxmd.com/read/28812668/evolutionary-transitions-towards-eusociality-in-snapping-shrimps
#3
Solomon Tin Chi Chak, J Emmett Duffy, Kristin M Hultgren, Dustin R Rubenstein
Animal social organization varies from complex societies where reproduction is dominated by a single individual (eusociality) to those where reproduction is more evenly distributed among group members (communal breeding). Yet, how simple groups transition evolutionarily to more complex societies remains unclear. Competing hypotheses suggest that eusociality and communal breeding are alternative evolutionary endpoints, or that communal breeding is an intermediate stage in the transition towards eusociality. We tested these alternative hypotheses in sponge-dwelling shrimps, Synalpheus spp...
March 20, 2017: Nature ecology & evolution
https://www.readbyqxmd.com/read/28812603/climate-change-upends-selection-on-ornamentation-in-a-wild-bird
#4
Simon R Evans, Lars Gustafsson
Secondary sexual traits have high heritabilities and are exposed to strong, environmentally sensitive selection, and so are expected to evolve rapidly in response to sustained environmental change. We examine the eco-evolutionary dynamics of ornament expression in a long-term study population of collared flycatchers, Ficedula albicollis, in which forehead patch size, which positively influences male reproductive success, declined markedly over 34 years. Annual fitness selection on forehead patch size switched from positive to negative during the study, a reversal that is accounted for by rising spring temperatures at the breeding site: highly ornamented males were selectively favoured following cold breeding seasons but selected against following warm breeding seasons...
January 23, 2017: Nature ecology & evolution
https://www.readbyqxmd.com/read/28810709/parallel-evolution-of-sperm-hyper-activation-ca2-channels
#5
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/28793027/oviposition-behavior-of-haemagogus-leucocelaenus-diptera-culicidae-a-vector-of-wild-yellow-fever-in-brazil
#6
Aline Tátila-Ferreira, Daniele de Aguiar Maia, Filipe Vieira Santos de Abreu, William Costa Rodrigues, Jeronimo Alencar
Haemagogus leucocelaenus, which is considered a major vector of wild yellow fever, exhibits acrodendrophilic habits and mainly deposits its eggs in treeholes and bamboo internodes. The selection of nursery sites is essential in the life history and reproductive success of mosquitoes. The present work investigated the preferred oviposition height and period of Hg. leucocelaenus in an Atlantic forest area in Rio de Janeiro. Sampling was performed using oviposition traps that were placed on plant material at 0, 2, 4, 6, and 8 m above the ground, from August 2015 to July 2016...
August 7, 2017: Revista do Instituto de Medicina Tropical de São Paulo
https://www.readbyqxmd.com/read/28780097/changes-in-animal-performance-and-profitability-of-holstein-dairy-operations-after-introduction-of-crossbreeding-with-montb%C3%A3-liarde-normande-and-scandinavian-red
#7
C Dezetter, N Bareille, D Billon, C Côrtes, C Lechartier, H Seegers
An individual-based mechanistic, stochastic, and dynamic simulation model was developed to assess economic effects resulting from changes in performance for milk yield and solid contents, reproduction, health, and replacement, induced by the introduction of crossbreeding in Holstein dairy operations. Three crossbreeding schemes, Holstein × Montbéliarde, Holstein × Montbéliarde × Normande, and Holstein × Montbéliarde × Scandinavian Red, were implemented in Holstein dairy operations and compared with Holstein pure breeding...
August 2, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28768890/is-meiosis-a-fundamental-cause-of-inviability-among-sexual-and-asexual-plants-and-animals
#8
Daniel A Levitis, Kolea Zimmerman, Anne Pringle
Differences in viability between asexually and sexually generated offspring strongly influence the selective advantage and therefore the prevalence of sexual reproduction (sex). However, no general principle predicts when sexual offspring will be more viable than asexual offspring. We hypothesize that when any kind of reproduction is based on a more complex cellular process, it will encompass more potential failure points, and therefore lower offspring viability. Asexual reproduction (asex) can be simpler than sex, when offspring are generated using only mitosis...
August 16, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28760759/adult-sex-ratios-and-partner-scarcity-among-hunter-gatherers-implications-for-dispersal-patterns-and-the-evolution-of-human-sociality
#9
Karen L Kramer, Ryan Schacht, Adrian Bell
Small populations are susceptible to high genetic loads and random fluctuations in birth and death rates. While these selective forces can adversely affect their viability, small populations persist across taxa. Here, we investigate the resilience of small groups to demographic uncertainty, and specifically to fluctuations in adult sex ratio (ASR), partner availability and dispersal patterns. Using 25 years of demographic data for two Savannah Pumé groups of South American hunter-gatherers, we show that in small human populations: (i) ASRs fluctuate substantially from year to year, but do not consistently trend in a sex-biased direction; (ii) the primary driver of local variation in partner availability is stochasticity in the sex ratio at maturity; and (iii) dispersal outside of the group is an important behavioural means to mediate locally constrained mating options...
September 19, 2017: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28760755/not-all-sex-ratios-are-equal-the-fisher-condition-parental-care-and-sexual-selection
#10
REVIEW
Michael D Jennions, Lutz Fromhage
The term 'sex roles' encapsulates male-female differences in mate searching, competitive traits that increase mating/fertilization opportunities, choosiness about mates and parental care. Theoretical models suggest that biased sex ratios drive the evolution of sex roles. To model sex role evolution, it is essential to note that in most sexually reproducing species (haplodiploid insects are an exception), each offspring has one father and one mother. Consequently, the total number of offspring produced by each sex is identical, so the mean number of offspring produced by individuals of each sex depends on the sex ratio (Fisher condition)...
September 19, 2017: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28760754/reproductive-competition-and-sexual-selection
#11
REVIEW
Tim Clutton-Brock
This paper traces the development of our understanding of the development of different approaches to estimating the strength of reproductive competition and sexual selection in the two sexes, based on measures of the operational sex ratio, the opportunity for sexual selection and contrasts in selection gradients between the sexes. It argues that different approaches provide complementary insights into the causes of sex differences in reproductive competition, the operation of sexual selection and the evolution of secondary sexual characters and that improvements in our understanding of the evolution of secondary sexual characters will require a more comprehensive understanding of the ways in which social and ecological conditions modify reproductive competition and development in females and males...
September 19, 2017: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28760665/metritis-vaccination-in-holstein-dairy-heifers-using-a-herd-specific-multivalent-vaccine-effects-on-uterine-health-and-fertility-in-first-lactation
#12
M Freick, A Kunze, O Passarge, J Weber, S Geidel
In cattle, acute puerperal metritis (APM) compromises animal welfare and has an economic impact to the farmer because of the detrimental effects on reproductive performance, milk production, and survivability. The aim of this randomized clinical study was to investigate the effects of a prepartum immunization using a herd-specific multivalent vaccine on incidence of APM, prevalence of clinical endometritis (CE), and selected measures of reproductive performance in primiparous Holstein cows. Pregnant nulliparous cows (230±4days of gestation) assigned to the vaccinated group (VG; n=142) received subcutaneously 5...
July 22, 2017: Animal Reproduction Science
https://www.readbyqxmd.com/read/28754128/does-air-pollution-play-a-role-in-infertility-a-systematic-review
#13
REVIEW
Julie Carré, Nicolas Gatimel, Jessika Moreau, Jean Parinaud, Roger Léandri
BACKGROUND: Air pollution is involved in many pathologies. These pollutants act through several mechanisms that can affect numerous physiological functions, including reproduction: as endocrine disruptors or reactive oxygen species inducers, and through the formation of DNA adducts and/or epigenetic modifications. We conducted a systematic review of the published literature on the impact of air pollution on reproductive function. Eligible studies were selected from an electronic literature search from the PUBMED database from January 2000 to February 2016 and associated references in published studies...
July 28, 2017: Environmental Health: a Global Access Science Source
https://www.readbyqxmd.com/read/28752194/from-engineering-to-editing-the-rat-genome
#14
Stephen Meek, Tomoji Mashimo, Tom Burdon
Since its domestication over 100 years ago, the laboratory rat has been the preferred experimental animal in many areas of biomedical research (Lindsey and Baker The laboratory rat. Academic, New York, pp 1-52, 2006). Its physiology, size, genetics, reproductive cycle, cognitive and behavioural characteristics have made it a particularly useful animal model for studying many human disorders and diseases. Indeed, through selective breeding programmes numerous strains have been derived that are now the mainstay of research on hypertension, obesity and neurobiology (Okamoto and Aoki Jpn Circ J 27:282-293, 1963; Zucker and Zucker J Hered 52(6):275-278, 1961)...
July 27, 2017: Mammalian Genome: Official Journal of the International Mammalian Genome Society
https://www.readbyqxmd.com/read/28747988/no-speed-dating-please-patterns-of-social-preference-in-male-and-female-house-mice
#15
Miriam Linnenbrink, Sophie von Merten
BACKGROUND: In many animal species, interactions between individuals of different sex often occur in the context of courtship and mating. During these interactions, a specific mating partner can be chosen. By discriminating potential mates according to specific characteristics, individuals can increase their evolutionary fitness in terms of reproduction and offspring survival. In this study, we monitored the partner preference behaviour of female and male wild house mice (Mus musculus domesticus) from populations in Germany (G) and France (F) in a controlled cage setup for 5 days and six nights...
2017: Frontiers in Zoology
https://www.readbyqxmd.com/read/28747810/differences-in-social-preference-between-the-sexes-during-ontogeny-drive-segregation-in-a-precocial-species
#16
Mark A Whiteside, Jayden O van Horik, Ellis J G Langley, Christine E Beardsworth, Philippa R Laker, Joah R Madden
ABSTRACT: Hypotheses for why animals sexually segregate typically rely on adult traits, such as differences in sexual roles causing differential habitat preferences, or size dimorphism inducing differences in diet or behaviour. However, segregation can occur in juveniles before such roles or size dimorphism is well established. In young humans, leading hypotheses suggest that (1) sexes differ in their activity and the synchronisation of behaviour causes segregation and (2) sexes separate in order to learn and maximise future reproductive roles...
2017: Behavioral Ecology and Sociobiology
https://www.readbyqxmd.com/read/28746975/breeding-habitat-selection-across-spatial-scales-is-grass-always-greener-on-the-other-side
#17
Paul Acker, Aurélien Besnard, Jean-Yves Monnat, Emmanuelle Cam
Habitat selection theory predicts that natural selection should favor mechanisms allowing individuals to choose habitats associated with the highest fitness prospects. However, identifying sources of information on habitat quality that individuals use to choose their breeding habitat has proved to be difficult. It has also proven difficult to identify dispersal costs that prevent individuals from joining the highest-quality sites. A synthesis that integrates dispersal costs and habitat selection mechanisms across space has remained elusive...
July 26, 2017: Ecology
https://www.readbyqxmd.com/read/28737761/glutamate-receptor-like-channels-are-essential-for-chemotaxis-and-reproduction-in-mosses
#18
Carlos Ortiz-Ramírez, Erwan Michard, Alexander A Simon, Daniel S C Damineli, Marcela Hernández-Coronado, Jörg D Becker, José A Feijó
Glutamate receptors are well characterized channels that mediate cell-to-cell communication during neurotransmission in animals. Nevertheless, information regarding their functional role in organisms without nervous systems is still limited. In plants, Glutamate Receptor-like (GLR) genes have been implicated in defence against pathogens, reproduction, control of stomata aperture and light signal transduction(1-5). However, the numerous GLR genes present in angiosperm genomes (20 to 70)(6) has prevented the observation of strong phenotypes in loss-of-function mutants...
July 24, 2017: Nature
https://www.readbyqxmd.com/read/28728362/estimation-of-genetic-parameters-of-the-productive-and-reproductive-traits-in-ethiopian-holstein-using-multi-trait-models
#19
Wondossen Ayalew, Mohammed Aliy, Enyew Negussie
Objective: The objective of this study was to estimate genetic parameters for productive and reproductive traits. Methods: The data included production and reproduction records of animals that have calved between 1979 and 2013. The genetic parameters were estimated using multivariate mixed models (DMU) package, fitting univariate and multivariate mixed models with average information restricted maximum likelihood (AI-REML) algorithm. Results: The estimates of heritability for milk production traits from the first three lactation records were 0...
June 27, 2017: Asian-Australasian Journal of Animal Sciences
https://www.readbyqxmd.com/read/28727035/genetic-analysis-of-feet-and-leg-conformation-traits-in-nelore-cattle
#20
G Vargas, H H R Neves, V Cardoso, D P Munari, R Carvalheiro
Feet and leg conformation scores are important traits in beef cattle because they encompass a wide range of locomotion disorders that can lead to productive and reproductive losses. Thus, the study of feet and legs in beef cattle is essential for evaluating possible responses to selection focusing on minimizing economic losses caused by the occurrence of feet and leg problems. The aim of this study was to estimate variance components for feet and leg conformation traits in Nelore cattle. The data set contained records of approximately 300,000 animals that were born between 2000 and 2013...
June 2017: Journal of Animal Science
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