scholarly journals Distinct genetic architectures underlie divergent thorax, leg, and wing pigmentation between Drosophila elegans and D. gunungcola

2020 ◽  
Author(s):  
Jonathan H. Massey ◽  
Jun Li ◽  
David L. Stern ◽  
Patricia J. Wittkopp
Keyword(s):  
Evolutionary Biology ◽  
Genetic Architecture ◽  
Genetic Basis ◽  
Species Differences ◽  
The Body ◽  
Body Parts ◽  
Genetic Changes ◽  
Body Regions ◽  
Three Body ◽  
Male Specific

AbstractUnderstanding the genetic basis of species differences is a major goal in evolutionary biology. Pigmentation divergence between Drosophila species often involves genetic changes in pigmentation candidate genes that pattern the body and wings, but it remains unclear how these changes affect pigmentation evolution in multiple body parts between the same diverging species. Drosophila elegans and D. gunungcola show pigmentation differences in the thorax, legs, and wings, with D. elegans exhibiting male-specific wing spots and D. gunungcola lacking wing spots with intensely dark thoraces and legs. Here, we performed QTL mapping to identify the genetic architecture of these differences. We find a large effect QTL on the X chromosome for all three body parts. QTL on Muller Element E were found for thorax pigmentation in both backcrosses but were only marginally significant in one backcross for the legs and wings. Consistent with this observation, we isolated the effects of the Muller Element E QTL by introgressing D. gunungcola alleles into a D. elegans genetic background and found that D. gunungcola alleles linked near the pigmentation candidate gene ebony caused intense darkening of the thorax, minimal darkening of legs, and minimal shrinking of wing spots. D. elegans ebony mutants showed changes in pigmentation consistent with Ebony having different effects on pigmentation in different tissues. Our results suggest that multiple genes have evolved differential effects on pigmentation levels in different body regions.

Cultural scripting of body parts for emotions

2002 ◽  
Vol 10 (1-2) ◽  
pp. 27-55 ◽  
Author(s):  
Felix K. Ameka
Keyword(s):  
Body Image ◽  
Emotional Experience ◽  
Cultural Construction ◽  
West African ◽  
The Body ◽  
Body Parts ◽  
African Language ◽  
Moving Body ◽  
Three Body ◽  
Red Eyes

Different languages present a variety of ways of talking about emotional experience. Very commonly, feelings are described through the use of ‘body image constructions’ in which they are associated with processes in, or states of, specific body parts. The emotions and the body parts that are thought to be their locus and the kind of activity associated with these body parts vary cross-culturally. This study focuses on the meaning of three ‘body image constructions’ used to describe feelings similar to, but also different from, English ‘jealousy’, ‘envy’, and ‘covetousness’ in the West African language Ewe. It is demonstrated that a ‘moving body’, a pychologised eye, and red eyes are scripted for these feelings. It is argued that the expressions are not figurative and that their semantics provide good clues to understanding the cultural construction of emotions both emotions and the body.

Oligogenic Adaptation, Soft Sweeps, and Parallel Melanic Evolution in Drosophila melanogaster

2016 ◽  
Author(s):  
Héloïse Bastide ◽  
Jeremy D. Lange ◽  
Justin B. Lack ◽  
Yassin Amir ◽  
John E. Pool
Keyword(s):  
Drosophila Melanogaster ◽  
Genetic Variation ◽  
Evolutionary Biology ◽  
Genetic Architecture ◽  
Genetic Basis ◽  
Simulation Analysis ◽  
Mapping Method ◽  
Sub Saharan Africa ◽  
Mountain Ranges ◽  
Sub Saharan

AbstractUnraveling the genetic architecture of adaptive phenotypic divergence is a fundamental quest in evolutionary biology. In Drosophila melanogaster, high-altitude melanism has evolved in separate mountain ranges in sub-Saharan Africa, potentially as an adaptation to UV intensity. We investigated the genetic basis of this melanism in three populations using a new bulk segregant analysis mapping method. Although hundreds of genes are known to affect cuticular pigmentation in D. melanogaster, we identified only 19 distinct QTLs from 9 mapping crosses, with several QTL peaks being shared among two or all populations. Surprisingly, we did not find wide signals of genetic differentiation (Fst) between lightly and darkly pigmented populations at these QTLs, in spite of the pronounced phenotypic difference in pigmentation. Instead, we found small numbers of highly differentiated SNPs at the probable causative genes. A simulation analysis showed that these patterns of polymorphism are consistent with selection on standing genetic variation (leading to “soft sweeps“). Our results thus support a role for oligogenic selection on standing genetic variation in driving parallel ecological adaptation.

scholarly journals Smart Care Beds for Elderly Patients with Impaired Mobility

2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Youn-Sik Hong
Keyword(s):  
Elderly Patients ◽  
Time Pressure ◽  
Pressure Sensors ◽  
The Body ◽  
High Rate ◽  
Body Parts ◽  
Mobility Impairment ◽  
Pressure Sensing ◽  
Body Regions ◽  
Microcontroller Unit

Most accidents occurring at medical institutions treating elderly patients with mobility impairment are bedsores and fall accidents. One of the reasons for this high rate of accidents is the lack of nursing personnel. In order to aid caregivers in nursing elderly patients who are not able to move about freely, in this paper, we propose a design and implementation of a smart bed. In this bed, several pressure sensors are deployed underneath the mattress cover to consider both peoples’ standard physical characteristics and the specific body parts where bedsores commonly occur. To manage the pressure ulcer area and to prevent falls, the body area is divided into three vertical areas and three horizontal areas. Each microcontroller unit manages pressure-sensing information in one of the body regions divided horizontally. In this study, a real-time pressure-sensing algorithm is presented that is capable of deciding on the possibilities of bedsores and falling accidents by considering both the intensity and the duration of pressure of specific body parts. Our experimental results demonstrate that a prototype smart bed works well for several human models of various heights and weights.

scholarly journals Concerted variation in melanogenesis genes underlies emergent patterning of plumage in capuchino seedeaters

2022 ◽  
Vol 289 (1966) ◽  
Author(s):  
Cecilia Estalles ◽  
Sheela P. Turbek ◽  
María José Rodríguez-Cajarville ◽  
Luís Fábio Silveira ◽  
Kazumasa Wakamatsu ◽  
...  
Keyword(s):  
Animal Communication ◽  
The Body ◽  
Body Parts ◽  
Genetic Changes ◽  
Association Analyses ◽  
Colour Variation ◽  
Genomic Changes ◽  
Colour Patterns ◽  
Coloration Patterns ◽  
Genomic Regions

Coloration traits are central to animal communication; they often govern mate choice, promote reproductive isolation and catalyse speciation. Specific genetic changes can cause variation in coloration, yet far less is known about how overall coloration patterns—which involve combinations of multiple colour patches across the body—can arise and are genomically controlled. We performed genome-wide association analyses to link genomic changes to variation in melanin (eumelanin and pheomelanin) concentration in feathers from different body parts in the capuchino seedeaters, an avian radiation with diverse colour patterns despite remarkably low genetic differentiation across species. Cross-species colour variation in each plumage patch is associated with unique combinations of variants at a few genomic regions, which include mostly non-coding (presumably regulatory) areas close to known pigmentation genes. Genotype–phenotype associations can vary depending on patch colour and are stronger for eumelanin pigmentation, suggesting eumelanin production is tightly regulated. Although some genes are involved in colour variation in multiple patches, in some cases, the SNPs associated with colour changes in different patches segregate spatially. These results suggest that coloration patterning in capuchinos is generated by the modular combination of variants that regulate multiple melanogenesis genes, a mechanism that may have promoted this rapid radiation.

The potential for rapid speciation in plants

Genome ◽  
1989 ◽  
Vol 31 (1) ◽  
pp. 203-210 ◽  
Author(s):  
Mark R. Macnair
Keyword(s):  
Reproductive Isolation ◽  
Genetic Architecture ◽  
Genetic Basis ◽  
Natural Populations ◽  
Direct Result ◽  
Epistatic Interactions ◽  
Genetic Changes ◽  
Rapid Speciation ◽  
Genetic Revolution ◽  
Self Fertilization

Speciation involves both ecological adaptation and reproductive isolation. This paper reviews various ways in which plants could achieve reproductive isolation as a direct result of adaptation to prevailing conditions, particularly through changes in flowering time, the adoption of self-fertilization, and changes in flower morphology so that different pollinators are attracted. These characters are likely to have a relatively simple genetic architecture, and there must frequently be genetic variance for them in natural populations. It is argued that speciation could thus be initiated swiftly in plants, without any need for a "genetic revolution" or the fixation of genes with strongly epistatic interactions. Postmating barriers also often have a simple genetic basis in plants, and so could also evolve swiftly if associated with an adaptive response. The nature of the genetic changes associated with speciation in a number of recent speciation events in Layia, Stephanomeria, and Mimulus is reviewed.Key words: Speciation, adaptation, reproductive isolation.

scholarly journals Craniofacial shape transition across the house mouse hybrid zone: implications for the genetic architecture and evolution of between-species differences

2016 ◽  
Author(s):  
Luisa F. Pallares ◽  
Leslie M. Turner ◽  
Diethard Tautz
Keyword(s):  
House Mouse ◽  
Hybrid Zone ◽  
Genetic Architecture ◽  
Genetic Basis ◽  
Species Differences ◽  
Food Sources ◽  
Species Variation ◽  
Shape Transition ◽  
Phenotypic Differences ◽  
Quantitative Changes

AbstractCraniofacial shape differences between taxa have often being linked to environmental adaptation, e.g. to new food sources, or have been studied in the context of domestication. Evidence for the genetic basis of such phenotypic differences to date suggests that within- as well as between-species variation has an oligogenic basis, i.e. few loci of large effect explain most of the variation. In mice, it has been shown that within-population craniofacial variation has a highly polygenic basis, but there are no data regarding the genetic basis of between-species differences. Here, we address this question using a phenotype-focused approach. Using 3D geometric morphometrics, we phenotyped a panel of mice derived from a natural hybrid zone between M. m. domesticus and M. m. musculus, and quantify the transition of craniofacial shape along the hybridization gradient. We find a continuous shape transition along the hybridization gradient, and unaltered developmental stability associated with hybridization. This suggests that the morphospace between the two subspecies is continuous despite reproductive isolation and strong barriers to gene flow. We show that quantitative changes in genome composition generate quantitative changes in craniofacial shape; this supports a highly polygenic basis for between-species craniofacial differences in the house mouse. We discuss our findings in the context of oligogenic versus polygenic models of the genetic architecture of morphological traits.

scholarly journals SEM Study on Morphological Changes in Metarhizium anisopliae Infected Aphis craccivora Koch.

2016 ◽  
Vol 30 (1) ◽  
pp. 29
Author(s):  
Sarodee Boruah ◽  
Pranab Dutta ◽  
Joyarani Pegu ◽  
Himadri Kaushik ◽  
N. Gogoi ◽  
...  
Keyword(s):  
Metarhizium Anisopliae ◽  
Mycelial Growth ◽  
Morphological Changes ◽  
Aphis Craccivora ◽  
The Body ◽  
Body Parts ◽  
Body Regions ◽  
Fungal Propagules ◽  
Sem Study ◽  
Scanning Electron

Morphological changes in <em>Metarhizuim anisopliae</em> (Metschnikoff) Sorokin infected cow pea aphid, <em>Aphis craccivora</em> Koch were studied by scanning electron microscope (SEM). Aphids were caged on paired lantern chimney over cowpea twigs dipped in conical flasks with water infected and inoculated with fungal propagules of <em>M. anisopliae</em> at the concentration of 1X10<sup>6</sup> spores /ml of water. Infected aphids were observed under SEM and it showed severe cuticular damage, abnormalities in sensory systems as well as deformation of all the body parts. The hydrophobic conidia of <em>M. anisopliae</em> were found to attach to all body regions. It was evident that mycelial growth and conidiophores with conidia of <em>M. anisopliae</em> covered the body surface and penetrates inside the body of infested aphid causing damage to the pest by disturbing its major physiological activities leading to its death.

scholarly journals Cultural scripting of body parts for emotions: On ‘jealousy’ and related emotions in Ewe

2002 ◽  
Vol 10 (1-2) ◽  
pp. 27-55 ◽  
Keyword(s):  
Body Image ◽  
Emotional Experience ◽  
Cultural Construction ◽  
West African ◽  
The Body ◽  
Body Parts ◽  
African Language ◽  
Moving Body ◽  
Three Body ◽  
Red Eyes

Different languages present a variety of ways of talking about emotional experience. Very commonly, feelings are described through the use of ‘body image constructions’ in which they are associated with processes in, or states of, specific body parts. The emotions and the body parts that are thought to be their locus and the kind of activity associated with these body parts vary cross-culturally. This study focuses on the meaning of three ‘body image constructions’ used to describe feelings similar to, but also different from, English ‘jealousy’, ‘envy’, and ‘covetousness’ in the West African language Ewe. It is demonstrated that a ‘moving body’, a pychologised eye, and red eyes are scripted for these feelings. It is argued that the expressions are not figurative and that their semantics provide good clues to understanding the cultural construction of emotions both emotions and the body.

A comparative study of fleece growth in Tasmanian Fine Merino and Wiltshire Horn ewes

1961 ◽  
Vol 57 (1) ◽  
pp. 11-19 ◽  
Author(s):  
J. Slee ◽  
H. B. Carter
Keyword(s):  
Growth Rate ◽  
Fibre Diameter ◽  
The Body ◽  
Back Side ◽  
Body Regions ◽  
Wide Range ◽  
Diameter Fibre ◽  
Fibre Growth ◽  
Skin Biopsies ◽  
Three Body

1. From repeated fibre samplings and several skin biopsies on six Tasmanian Fine Merinos and eight Wiltshire Horn adult ewes variations in fibre diameter, fibre growth rate, and fibre regeneration or shedding frequency were measured over a period of 15 months. Slight differences were present in the treatment of the two breeds, but from the combined evidence of the live weights and fibre diameters maintained, it was concluded that these were negligible, that both breeds were under closely comparable conditions, and that their performance was at a moderately high and typical level for each breed.2. In the Merinos fibre diameter (ca. 20 µ) fluctuated little during the period of observation, whereas in the Wiltshires it varied over a wide range from less than 40µ in winter to more than 80µ in summer. There were negligible differences between the three body regions, back, side, and belly, in the Merinos, but in the Wiltshires the belly grew markedly coarser fibres than the other two regions.3. The fibre growth rate in the Merinos did not vary greatly from 7 to 8 mm. per 28 days throughout the period of observation or between the body regions. In the Wiltshires, fibre growth rate showed extreme variations from a minimum of about 3 mm. during the winter to a maximum of about 12 mm. per 28 days at the end of summer, with significant differences between the three body regions. However, in spite of these differences in the mode of growth, the total length of fibre grown per annum at the midside was approximately the same (10 cm.). Thus, were it not for fibre shedding, the Wiltshire Horn breed would grow a short-wool fleece.

Sallust’s Imitation of Greek Models at Catiline 14.2-3

Mnemosyne ◽  
2012 ◽  
Vol 65 (1) ◽  
pp. 40-61 ◽  
Author(s):  
Kevin Muse
Keyword(s):  
The Body ◽  
Body Parts ◽  
Three Body ◽  
Shed Light ◽  
Complete Deletion

Abstract Sallust’s description of Catiline’s profligate retinue at Catiline 14.2-3 contains a well-known textual problem. It is certain that the prodigals at the beginning of the sentence wasted their property by means of three body parts (manu ventre pene). Problematic, however, are the three types of wastrel that immediately precede the body parts, printed in most editions as inpudicus adulter ganeo. Because of the imprecise correspondence between these characters and the body parts, a number of remedies have been proposed, ranging from various emendations that create a more straightforward chiastic structure to complete deletion of inpudicus adulter ganeo as glosses. This paper proposes to shed light on the passage by examining the Greek models that Sallust imitated in constructing it: Theopompus’ description of Philip’s courtiers in Macedon and a passage of invective by the orator Lycurgus. It is concluded that emendation, rather than radical truncation, is the best remedy.

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