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https://www.readbyqxmd.com/read/29328538/conflict-between-heterozygote-advantage-and-hybrid-incompatibility-in-haplodiploids-and-sex-chromosomes
#1
Ana-Hermina Ghenu, Alexandre Blanckaert, Roger K Butlin, Jonna Kulmuni, Claudia Bank
In many diploid species the sex chromosomes play a special role in mediating reproductive isolation. In haplodiploids, where females are diploid and males haploid, the whole genome behaves similarly to the X/Z chromosomes of diploids. Therefore, haplodiploid systems can serve as a model for the role of sex chromosomes in speciation and hybridization. A previously described population of Finnish Formica wood ants displays genome-wide signs of ploidally and sexually antagonistic selection resulting from hybridization...
January 12, 2018: Molecular Ecology
https://www.readbyqxmd.com/read/29312830/developmental-effects-of-environmental-light-on-male-nuptial-coloration-in-lake-victoria-cichlid-fish
#2
Daniel Shane Wright, Emma Rietveld, Martine E Maan
Background: Efficient communication requires that signals are well transmitted and perceived in a given environment. Natural selection therefore drives the evolution of different signals in different environments. In addition, environmental heterogeneity at small spatial or temporal scales may favour phenotypic plasticity in signaling traits, as plasticity may allow rapid adjustment of signal expression to optimize transmission. In this study, we explore signal plasticity in the nuptial coloration of Lake Victoria cichlids, Pundamilia pundamilia and Pundamilia nyererei...
2018: PeerJ
https://www.readbyqxmd.com/read/29289354/the-role-of-seasonal-migration-in-population-divergence-and-reproductive-isolation
#3
REVIEW
Sheela P Turbek, Elizabeth S C Scordato, Rebecca J Safran
Seasonal journeys between breeding and non-breeding habitat are undertaken by a diverse array of animals. Parallel developments in tracking and genomic methods are enabling finer resolution of these movements and their role in the evolutionary process. Evidence from allopatric and co-occurring breeding populations indicates that variation in migratory behavior is often associated with genetic differentiation. While assortative mating and selection against hybrids due to divergent migratory phenotypes can contribute to reproductive isolation, the details of these mechanisms remain unclear...
December 27, 2017: Trends in Ecology & Evolution
https://www.readbyqxmd.com/read/29244561/mechanisms-of-assortative-mating-in-speciation-with-gene-flow-connecting-theory-and-empirical-research
#4
Michael Kopp, Maria R Servedio, Tamra C Mendelson, Rebecca J Safran, Rafael L Rodríguez, Mark E Hauber, Elizabeth C Scordato, Laurel B Symes, Christopher N Balakrishnan, David M Zonana, G Sander van Doorn
The large body of theory on speciation with gene flow has brought to light fundamental differences in the effects of two types of mating rules on speciation: preference/trait rules, in which divergence in both (female) preferences and (male) mating traits is necessary for assortment, and matching rules, in which individuals mate with like individuals on the basis of the presence of traits or alleles that they have in common. These rules can emerge from a variety of behavioral or other mechanisms in ways that are not always obvious...
January 2018: American Naturalist
https://www.readbyqxmd.com/read/29234169/characterization-of-hybridization-within-a-secondary-contact-region-of-the-inshore-fish-bostrychus-sinensis-in-the-east-china-sea
#5
Shaoxiong Ding, Mrinal Mishra, Haohao Wu, Shuang Liang, Michael M Miyamoto
The northwest Pacific marginal seas are a primary center of phylogeographic and evolutionary research, because of their dynamic geographic history of falling and rising sea levels during the glaciations and interglaciations of the last one million years. Here we present new molecular and morphological data for geographic samples of the four-eyed sleeper (Bostrychus sinensis), which reinforce the evidence for secondary contact and hybridization between two phylogeographic lineages in the East China Sea. Specifically, we find that the secondary contact region is characterized by a low frequency of hybridization, where mitochondrial DNA introgression is relatively common, whereas F1 hybrids are correspondingly scarce...
January 2018: Heredity
https://www.readbyqxmd.com/read/29225349/tau-haplotypes-support-the-asian-ancestry-of-the-roma-population-settled-in-the-basque-country
#6
Miguel A Alfonso-Sánchez, Ibone Espinosa, Luis Gómez-Pérez, Alaitz Poveda, Esther Rebato, Jose A Peña
We examined tau haplotype frequencies in two different ethnical groups from the Basque Country (BC): Roma people and residents of European ancestry (general population). In addition, we analyzed the spatial distribution of tau haplotypes in Eurasian populations to explore the genetic affinities of the Romani groups living in Europe in a broader scope. The 17q21.31 genomic region was characterized through the genotyping of two diagnostic single nucleotide polymorphisms, SNPs (rs10514879 and rs199451), which allow the identification of H1 and H2 haplotypes...
December 11, 2017: Heredity
https://www.readbyqxmd.com/read/29218330/interactive-effects-of-parental-age-on-offspring-fitness-and-age-assortative-mating-in-a-wild-bird
#7
E Keith Bowers, Scott K Sakaluk, Charles F Thompson
Variation in parental age can have important consequences for offspring fitness and the structure of populations and disease transmission. However, our understanding of the effects of parental age on offspring in natural populations is limited. Here, we investigate consequences of parental age for offspring fitness and test for age-assortative mating in a short-lived bird, the house wren (Troglodytes aedon). Offspring immunoresponsiveness increased with maternal age and decreased with paternal age, but the strength of these effects varied with the age of one's mate...
June 2017: Journal of Experimental Zoology. Part A, Ecological and Integrative Physiology
https://www.readbyqxmd.com/read/29209360/assortative-mating-by-ethnicity-in-longevous-families
#8
Paola Sebastiani, Anastasia Gurinovich, Harold Bae, Stacy L Andersen, Thomas T Perls
Recent work shows strong evidence of ancestry-based assortative mating in spouse pairs of the older generation of the Framingham Heart Study. Here, we extend this analysis to two studies of human longevity: the Long Life Family Study (LLFS), and the New England Centenarian Study (NECS). In the LLFS, we identified 890 spouse pairs spanning two generations, while in the NECS we used data from 102 spouse pairs including offspring of centenarians. We used principal components of genome-wide genotype data to demonstrate strong evidence of ancestry-based assortative mating in spouse pairs of the older generation and also confirm the decreasing trend of endogamy in more recent generations...
2017: Frontiers in Genetics
https://www.readbyqxmd.com/read/29205289/can-mesophotic-reefs-replenish-shallow-reefs-reduced-coral-reproductive-performance-casts-a-doubt
#9
Tom Shlesinger, Mila Grinblat, Hanna Rapuano, Tal Amit, Yossi Loya
Mesophotic coral ecosystems (i.e. deep coral reefs at 30-120 m depth) appear to be thriving while many shallow reefs in the world are declining. Amidst efforts to understand and manage their decline, it was suggested that mesophotic reefs might serve as natural refuges and a possible source of propagules for the shallow reefs. However, our knowledge of how reproductive performance of corals alters with depth is sparse. Here, we present a comprehensive study of the reproductive phenology, fecundity and abundance of seven reef-building conspecific corals in shallow and mesophotic habitats...
December 2, 2017: Ecology
https://www.readbyqxmd.com/read/29148562/recurrence-of-reported-cdh23-mutations-causing-dfnb12-in-a-special-cohort-of-south-indian-hearing-impaired-assortative-mating-families-an-evaluation
#10
Paridhy Vanniya S, Jayasankaran Chandru, Amritkumar Pavithra, Justin Margret Jeffrey, Murugesan Kalaimathi, Rajagopalan Ramakrishnan, Natarajan P Karthikeyen, Srisailapathy C R Srikumari
Mutations in CDH23 are known to cause autosomal-recessive nonsyndromic hearing loss (DFNB12). Until now, there was only one study describing its frequency in Indian population. We screened for CDH23 mutations to identify prevalent and recurring mutations among South Indian assortative mating hearing-impaired individuals who were identified as non-DFNB1 (GJB2 and GJB6). Whole-exome sequencing was performed in individuals found to be heterozygous for CDH23 to determine whether there was a second pathogenic allele...
November 17, 2017: Annals of Human Genetics
https://www.readbyqxmd.com/read/29146993/height-associated-variants-demonstrate-assortative-mating-in-human-populations
#11
Xiaoyin Li, Susan Redline, Xiang Zhang, Scott Williams, Xiaofeng Zhu
Understanding human mating patterns, which can affect population genetic structure, is important for correctly modeling populations and performing genetic association studies. Prior studies of assortative mating in humans focused on trait similarity among spouses and relatives via phenotypic correlations. Limited research has quantified the genetic consequences of assortative mating. The degree to which the non-random mating influences genetic architecture remains unclear. Here, we studied genetic variants associated with human height to assess the degree of height-related assortative mating in European-American and African-American populations...
November 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29131310/tests-of-fit-of-historically-informed-models-of-african-american-admixture
#12
Jessica M Gross
OBJECTIVES: African American populations in the U.S. formed primarily by mating between Africans and Europeans over the last 500 years. To date, studies of admixture have focused on either a one-time admixture event or continuous input into the African American population from Europeans only. Our goal is to gain a better understanding of the admixture process by examining models that take into account (a) assortative mating by ancestry in the African American population, (b) continuous input from both Europeans and Africans, and (c) historically informed variation in the rate of African migration over time...
November 13, 2017: American Journal of Physical Anthropology
https://www.readbyqxmd.com/read/29109277/gut-microbiomes-and-reproductive-isolation-in-drosophila
#13
Philip T Leftwich, Naomi V E Clarke, Matthew I Hutchings, Tracey Chapman
Experimental studies of the evolution of reproductive isolation (RI) in real time are a powerful way in which to reveal fundamental, early processes that initiate divergence. In a classic speciation experiment, populations of Drosophila pseudoobscura were subjected to divergent dietary selection and evolved significant positive assortative mating by diet. More recently, a direct role for the gut microbiome in determining this type of RI in Drosophila melanogaster has been proposed. Manipulation of the diet, and hence the gut microbiome, was reported to result in immediate assortative mating by diet, which could be eliminated by reducing gut microbes using antibiotics and recreated by adding back Lactobacillus plantarum We suggest that the evolutionary significance of this result is unclear...
November 6, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29063140/biocide-selective-tolc-independent-efflux-pumps-in-enterobacteriaceae
#14
Carmine J Slipski, George G Zhanel, Denice C Bay
Bacterial resistance to biocides used as antiseptics, dyes, and disinfectants is a growing concern in food preparation, agricultural, consumer manufacturing, and health care industries, particularly among Gram-negative Enterobacteriaceae, some of the most common community and healthcare-acquired bacterial pathogens. Biocide resistance is frequently associated with antimicrobial cross-resistance leading to reduced activity and efficacy of both antimicrobials and antiseptics. Multidrug resistant efflux pumps represent an important biocide resistance mechanism in Enterobacteriaceae...
October 23, 2017: Journal of Membrane Biology
https://www.readbyqxmd.com/read/29056455/genetic-coupling-of-female-mate-choice-with-polygenic-ecological-divergence-facilitates-stickleback-speciation
#15
Rachael A Bay, Matthew E Arnegard, Gina L Conte, Jacob Best, Nicole L Bedford, Shaugnessy R McCann, Matthew E Dubin, Yingguang Frank Chan, Felicity C Jones, David M Kingsley, Dolph Schluter, Catherine L Peichel
Ecological speciation with gene flow is widespread in nature [1], but it presents a conundrum: how are associations between traits under divergent natural selection and traits that contribute to assortative mating maintained? Theoretical models suggest that genetic mechanisms inhibiting free recombination between loci underlying these two types of traits (hereafter, "genetic coupling") can facilitate speciation [2-4]. Here, we perform a direct test for genetic coupling by mapping both divergent traits and female mate choice in a classic model of ecological speciation: sympatric benthic and limnetic threespine stickleback (Gasterosteus aculeatus)...
November 6, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/29053357/the-roles-of-sexual-and-viability-selection-in-the-evolution-of-incomplete-reproductive-isolation-from-allopatry-to-sympatry
#16
Olivier Cotto, Maria R Servedio
In recent years, theoretical models have introduced the concept that ongoing hybridization between "good" species can occur because incomplete reproductive isolation can be a selected optimum. They furthermore show that positive frequency-dependent sexual selection, which is naturally generated by some of the underlying processes that lead to assortative mating, plays a key role in the evolution of incomplete reproductive isolation. This occurs, however, through different mechanisms in sympatric versus allopatric scenarios...
November 2017: American Naturalist
https://www.readbyqxmd.com/read/29040605/negative-assortative-mating-in-the-white-throated-sparrow
#17
Philip W Hedrick, Elaina M Tuttle, Rusty A Gonser
Non-random mating based on phenotype has been observed in a number of organisms, but a very high proportion of these examples are of assortative mating. The strongest example of negative-assortative mating is for white-striped versus tan-striped crown in the white-throated sparrow, where about 98% of the observed pairings (mated pairs or social pairs) are between mates with different phenotypes and the correlation between mating types is -0.964. Although non-random mating has been explored theoretically for decades, these models have generally not focused on specific well-documented examples...
October 10, 2017: Journal of Heredity
https://www.readbyqxmd.com/read/29035717/concordance-of-health-states-in-couples-analysis-of-self-reported-nurse-administered-and-blood-based-biomarker-data-in-the-uk-understanding-society-panel
#18
Apostolos Davillas, Stephen Pudney
We use self-reported health measures, nurse-administered measurements and blood-based biomarkers to examine the concordance between health states of partners in marital/cohabiting relationships in the UK. A model of cumulative health exposures is used to interpret the empirical pattern of between-partner health correlation in relation to elapsed relationship duration, allowing us to distinguish non-causal correlation due to assortative mating from potentially causal effects of shared lifestyle and environmental factors...
September 29, 2017: Journal of Health Economics
https://www.readbyqxmd.com/read/29035692/the-development-of-chronic-physical-aggression-a-bio-psycho-social-model-for-the-next-generation-of-preventive-interventions
#19
Richard E Tremblay, Frank Vitaro, Sylvana M Côté
This review describes a bio-psycho-social approach to understanding and preventing the development of chronic physical aggression. The debate on the developmental origins of aggression has historically opposed genetic and environmental mechanisms. Recent studies have shown that the frequency of physical aggression peaks in early childhood and then decreases until old age. Molecular genetic studies and twin studies have confirmed important genetic influences. However, recent epigenetic studies have highlighted the important role of environments in gene expression and brain development...
October 16, 2017: Annual Review of Psychology
https://www.readbyqxmd.com/read/28987006/effects-of-assortative-mate-choice-on-the-genomic-and-morphological-structure-of-a-hybrid-zone-between-two-bird-subspecies
#20
Georgy A Semenov, Elizabeth S C Scordato, David R Khaydarov, Chris C R Smith, Nolan C Kane, Rebecca J Safran
Phenotypic differentiation plays an important role in the formation and maintenance of reproductive barriers. In some cases, variation in a few key aspects of phenotype can promote and maintain divergence; hence, the identification of these traits and their associations with patterns of genomic divergence is crucial for understanding the patterns and processes of population differentiation. We studied hybridization between the alba and personata subspecies of the white wagtail (Motacilla alba), and quantified divergence and introgression of multiple morphological traits and 19,437 SNP loci on a 3,000 km transect...
October 7, 2017: Molecular Ecology
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