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Sexual dimorphism

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https://www.readbyqxmd.com/read/29150648/shedding-light-on-the-neonatal-brain-probing-cerebral-hemodynamics-by-diffuse-optical-spectroscopic-methods
#1
Parisa Farzam, Erin M Buckley, Pei-Yi Lin, Katherine Hagan, P Ellen Grant, Terrie Eleanor Inder, Stefan A Carp, Maria Angela Franceschini
Investigating the cerebral physiology of healthy term newborns' brains is important for better understanding perinatal brain injuries, of which the most common etiologies are hypoxia and ischemia. Hence, cerebral blood flow and cerebral oxygenation are important biomarkers of brain health. In this study, we employed a hybrid diffuse optical system consisting of diffuse correlation spectroscopy (DCS) and frequency-domain near infrared spectroscopy (FDNIRS) to measure hemoglobin concentration, oxygen saturation, and indices of cerebral blood flow and metabolism...
November 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29149626/crossbred-young-bulls-and-heifers-sired-by-double-muscled-piemontese-or-belgian-blue-bulls-exhibit-different-effects-of-sexual-dimorphism-on-fattening-performance-and-muscularity-but-not-on-meat-quality-traits
#2
Giovanni Bittante, Alessio Cecchinato, Franco Tagliapietra, Rina Verdiglione, Alberto Simonetto, Stefano Schiavon
As double-muscled Belgian Blue (BB) and Piemontese (PIEM) breeds are heavily selected for different objectives (the former mainly for muscularity, the latter for ease of calving), the aim of this study was to compare sexual dimorphism in 56 crossbred young bulls and heifers obtained from dairy cows mated to bulls of the two beef breeds. Young PIEM- and BB-sired bulls had similar fattening performances and beef traits, although the BB crossbreds were slightly more muscular. Otherwise, the BB-sired heifers exceeded the PIEM-sired heifers in growth rate (1...
November 4, 2017: Meat Science
https://www.readbyqxmd.com/read/29148039/3d-analysis-of-sexual-dimorphism-in-size-shape-and-breathing-kinematics-of-human-lungs
#3
Nicole Torres-Tamayo, Daniel García-Martínez, Stephanie Lois Zlolniski, Isabel Torres-Sánchez, Francisco García-Río, Markus Bastir
Sexual dimorphism in the human respiratory system has been previously reported at the skeletal (cranial and thoracic) level, but also at the pulmonary level. Regarding lungs, foregoing studies have yielded sex-related differences in pulmonary size as well as lung shape details, but different methodological approaches have led to discrepant results on differences in respiratory patterns between males and females. The purpose of this study is to analyse sexual dimorphism in human lungs during forced respiration using 3D geometric morphometrics...
November 17, 2017: Journal of Anatomy
https://www.readbyqxmd.com/read/29147778/genome-wide-investigation-of-transcription-factors-provides-insights-into-transcriptional-regulation-in-plutella-xylostella
#4
Qian Zhao, Dongna Ma, Yuping Huang, Weiyi He, Yiying Li, Liette Vasseur, Minsheng You
Transcription factors (TFs), which play a vital role in regulating gene expression, are prevalent in all organisms and characterization of them may provide important clues for understanding regulation in vivo. The present study reports a genome-wide investigation of TFs in the diamondback moth, Plutella xylostella (L.), a worldwide pest of crucifers. A total of 940 TFs distributed among 133 families were identified. Phylogenetic analysis of insect species showed that some of these families were found to have expanded during the evolution of P...
November 16, 2017: Molecular Genetics and Genomics: MGG
https://www.readbyqxmd.com/read/29139158/macro-anatomical-and-morphometric-studies-of-the-hindlimb-of-grasscutter-thryonomys-swinderianus-temminck-1827
#5
K T Onwuama, S A Ojo, J O Hambolu, T Dzenda, F O Zakari, S O Salami
The hindlimb of the grasscutter (Thryonomys swinderianus, Temminck-1827) was studied using 12 adult (≥6 months) rats of either sex with the mean weights of 1.42 ± 0.20 kg and 0.82 ± 0.13 kg for buck (n = 6) and doe (n = 6), respectively (p < .05). Characteristics of the bones were studied by gross observation after their preparation. Measurements of different segments of the hindlimb were also taken, giving a total average length of 31.80 cm. Correlation coefficients between length of bone and weight of rats were positive (p < ...
November 14, 2017: Anatomia, Histologia, Embryologia
https://www.readbyqxmd.com/read/29139129/reproductive-biology-of-female-striped-marlin-kajikia-audax-in-the-western-pacific-ocean
#6
H-Y Chang, C-L Sun, S-Z Yeh, Y-J Chang, N-J Su, G DiNardo
Length and mass data for 1260 (536 females, 683 males, 41 sex unknown) striped marlin Kajikia audax were collected at the fish markets of Tungkang, Singkang and Nanfangao from July 2004 to September 2010. Of these samples, 534 gonads (236 females and 298 males) ranging from 95 to 206 cm in eye-to-fork length (LEF ) and 8 to 88 kg in round mass (MR ), were collected. Chi-square tests indicated sex ratios were homogeneous among months in 2004 and 2006-2008, but not in 2005, 2009 and 2010; and there were significant differences in sex ratio by size...
November 15, 2017: Journal of Fish Biology
https://www.readbyqxmd.com/read/29139128/development-of-secondary-sexual-characters-and-their-relationship-to-ontogeny-and-seasonal-reproductive-period-in-hyphessobrycon-igneus-ostariophysi-characiformes
#7
L Schönhofen Longoni, J Giora, C Bernhardt Fialho
Sexual dimorphism in size, anal-fin shape and coloration of Hyphessobrycon igneus, Characidae, were examined. Males were more frequent at larger body sizes, confirming body size as a sexually dimorphic trait. Anal-fin shape and the colour of all fins were the same for females and juveniles, differing only in adult males. Likewise, only adult males had bony hooks on fin rays; larger and more sexually mature males had the most numerous and developed hooks and hooks were most developed in degree and number during peak reproductive periods...
November 15, 2017: Journal of Fish Biology
https://www.readbyqxmd.com/read/29135489/endocrine-disrupters-and-pubertal-timing
#8
Louise C Greenspan, Mary M Lee
PURPOSE OF REVIEW: The current review summarizes recent epidemiologic data demonstrating the effects of endocrine disrupting compounds (EDCs) on the timing of puberty and highlights the complexity of understanding the interplay of environmental and genetic factors on pubertal timing. RECENT FINDINGS: In girls, there have been mixed results, with some exposures being associated with earlier timing of puberty, and some with later puberty. In boys, prepubertal exposures to nondioxin-like polychlorinated biphenyls accelerate puberty, whereas levels of insecticides, dioxin-like compounds, organochlorine pesticides, and lead delay puberty...
November 11, 2017: Current Opinion in Endocrinology, Diabetes, and Obesity
https://www.readbyqxmd.com/read/29134747/no-sex-difference-in-digit-ratios-2d-4d-in-the-traditional-yali-of-papua-and-its-meaning-for-the-previous-hypotheses-on-the-inter-populational-variability-in-2d-4d
#9
Michalina Marczak, Michał Misiak, Agnieszka Sorokowska, Piotr Sorokowski
OBJECTIVES: The ratio between the 2nd and 4th digit (2D:4D) is considered to be a sexually dimorphic trait in humans, with males having on average lower 2D:4D values than females. However, significant inter- and intra-sexual differences in digit ratios across populations have been reported. In order to further explore factors influencing the variability of 2D:4D, we performed a study among the Yali, a traditional population from Papua. METHODS: We measured digit ratios of 79 adults (47 males) from the traditional Yali society, a polygamous group who inhabit a harsh high-mountain environment almost directly on the equator...
November 14, 2017: American Journal of Human Biology: the Official Journal of the Human Biology Council
https://www.readbyqxmd.com/read/29133872/the-core-promoter-factor-trf2-mediates-a-fruitless-action-to-masculinize-neurobehavioral-traits-in-drosophila
#10
Zahid Sadek Chowdhury, Kosei Sato, Daisuke Yamamoto
In fruit flies, the male-specific fruitless (fru) gene product FruBM plays a central role in establishing the neural circuitry for male courtship behavior by orchestrating the transcription of genes required for the male-type specification of individual neurons. We herein identify the core promoter recognition factor gene Trf2 as a dominant modifier of fru actions. Trf2 knockdown in the sexually dimorphic mAL neurons leads to the loss of a male-specific neurite and a reduction in male courtship vigor. TRF2 forms a repressor complex with FruBM, strongly enhancing the repressor activity of FruBM at the promoter region of the robo1 gene, whose function is required for inhibiting the male-specific neurite formation...
November 14, 2017: Nature Communications
https://www.readbyqxmd.com/read/29127010/cyclosporine-a-exhibits-gender-specific-nephrotoxicity-in-rats-effect-on-renal-tissue-inflammation
#11
Hany M El-Bassossy, Basma G Eid
Cyclosporine A (CSA) is a widely used immunosuppressant drug known to commonly cause cardio and nephrotoxicity. A study looking at the sex specificity of the cardiotoxicity of CSA revealed that sexual dimorphism existed when looking at the electrocardiographs and left ventricles of CSA-treated rats. We hypothesized that cyclosporine A exhibited gender-specific nephrotoxicity by testing various parameters of kidney function in male and female rats treated for 21 days with 15 mg/kg CSA versus control male and female rats that received a vehicle consisting of 18% kolliphore and 2% ethanol in sterile saline...
November 7, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29126291/the-dynamic-development-of-germ-cells-during-chicken-embryogenesis
#12
Seo Yeong Yang, Hong Jo Lee, Hyung Chul Lee, Young Sun Hwang, Young Hyun Park, Tamao Ono, Jae Yong Han
Appropriate regulation of cell proliferation during embryogenesis is crucial for the maintenance of germness. An in-depth understanding of germ cell developmental processes may yield valuable information on germ cell biology and applied sciences. However, direct evidences about germ cell proliferation and cell cycling during avian embryonic development has not been well-studied. Thus, we explored chicken germ cell dynamics during embryonic development via flow cytometry employing a germ cell-specific anti-cVASA antibody (the chicken VASA homolog is termed CVH) and propidium iodide staining...
November 4, 2017: Poultry Science
https://www.readbyqxmd.com/read/29121076/male-group-size-female-distribution-and-changes-in-sexual-segregation-by-roosevelt-elk
#13
Leah M Peterson, Floyd W Weckerly
Sexual segregation, or the differential use of space by males and females, is hypothesized to be a function of body size dimorphism. Sexual segregation can also manifest at small (social segregation) and large (habitat segregation) spatial scales for a variety of reasons. Furthermore, the connection between small- and large-scale sexual segregation has rarely been addressed. We studied a population of Roosevelt elk (Cervus elaphus roosevelti) across 21 years in north coastal California, USA, to assess small- and large-scale sexual segregation in winter...
2017: PloS One
https://www.readbyqxmd.com/read/29118750/an-rna-virome-associated-to-the-golden-orb-weaver-spider-nephila-clavipes
#14
Humberto J Debat
The golden orb-weaver spider Nephila clavipes, known for its sexual size dimorphism, is abundant and widespread in the New World. The first annotated genome of orb-weaver spiders, exploring N. clavipes, has recently been reported. The study, focused primarily on the diversity of silk specific genes, shed light into the complex evolutionary history of spiders. Furthermore, a robust transcriptome analysis provided a massive resource for N. clavipes RNA survey. Here, I present evidence of viral sequences corresponding to the first 10 extant virus species associated to N...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29118131/humans-as-a-model-species-for-sexual-selection-research
#15
REVIEW
Michael Lawrence Wilson, Carrie M Miller, Kristin N Crouse
Ever since Darwin, questions about humans have driven sexual selection research. While studies of other organisms are often justified as useful for improving understanding of humans, humans themselves can be useful models. Although humans present some drawbacks as model organisms (complicated societies, slow reproduction and strong ethical constraints on experimental options), humans nonetheless offer many advantages (being abundant, accessible and having detailed historical records for some populations). As an additional challenge, humans exhibit a rather puzzling combination of traits...
November 15, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/29116078/tracing-the-origin-and-evolution-of-supergene-mimicry-in-butterflies
#16
Wei Zhang, Erica Westerman, Eyal Nitzany, Stephanie Palmer, Marcus R Kronforst
Supergene mimicry is a striking phenomenon but we know little about the evolution of this trait in any species. Here, by studying genomes of butterflies from a recent radiation in which supergene mimicry has been isolated to the gene doublesex, we show that sexually dimorphic mimicry and female-limited polymorphism are evolutionarily related as a result of ancient balancing selection combined with independent origins of similar morphs in different lineages and secondary loss of polymorphism in other lineages...
November 7, 2017: Nature Communications
https://www.readbyqxmd.com/read/29114202/estradiol-uses-different-mechanisms-in-astrocytes-from-the-hippocampus-of-male-and-female-rats-to-protect-against-damage-induced-by-palmitic-acid
#17
Laura M Frago, Sandra Canelles, Alejandra Freire-Regatillo, Pilar Argente-Arizón, Vicente Barrios, Jesús Argente, Luis M Garcia-Segura, Julie A Chowen
An excess of saturated fatty acids can be toxic for tissues, including the brain, and this has been associated with the progression of neurodegenerative diseases. Since palmitic acid (PA) is a free fatty acid that is abundant in the diet and circulation and can be harmful, we have investigated the effects of this fatty acid on lipotoxicity in hippocampal astrocytes and the mechanism involved. Moreover, as males and females have different susceptibilities to some neurodegenerative diseases, we accessed the responses of astrocytes from both sexes, as well as the possible involvement of estrogens in the protection against fatty acid toxicity...
2017: Frontiers in Molecular Neuroscience
https://www.readbyqxmd.com/read/29111615/glutathione-s-transferase-genes-and-the-risk-of-type-2-diabetes-mellitus-the-role-of-sexual-dimorphism-gene-gene-and-gene-smoking-interactions-in-disease-susceptibility
#18
Iuliia Azarova, Olga Bushueva, Alexander Konoplya, Alexey Polonikov
BACKGROUND: A compromised defense against reactive oxygen species (ROS) is considered to play an important role in the pathogenesis of type 2 diabetes (T2D), therefore, genes encoding antioxidant defense enzymes may contribute to disease susceptibility. The present study investigated whether polymorphisms in the genes encoding glutathione S-transferase M1 (GSTM1), T1 (GSTT1) and P1 (GSTP1) jointly contribute to the risk of T2D. METHODS: A total of 1,120 unrelated Russian subjects, including 600 patients with T2D and 520 age- and sex-matched healthy subjects, were recruited for this study...
November 7, 2017: Journal of Diabetes
https://www.readbyqxmd.com/read/29104826/male-male-competition-and-female-choice-are-differentially-affected-by-male-call-acoustics-in-the-serrate-legged-small-treefrog-kurixalus-odontotarsus
#19
Bicheng Zhu, Jichao Wang, Longhui Zhao, Qinghua Chen, Zhixin Sun, Yue Yang, Steven E Brauth, Yezhong Tang, Jianguo Cui
Background: The evolution of exaggerated vocal signals in anuran species is an important topic. Males and females have both evolved the ability to discriminate communication sounds. However, the nature of sexual dimorphism in cognition and sensory discrimination and in the evolution and limitation of sexual signal exaggeration remain relatively unexplored. Methods: In the present study, we used male calls of varied complexity in the serrate-legged small treefrog, Kurixalus odontotarsus, as probes to investigate how both sexes respond to variations in call complexity and how sex differences in signal discrimination play a role in the evolution of sexual signal exaggeration...
2017: PeerJ
https://www.readbyqxmd.com/read/29104246/relation-among-aromatase-p450-and-tumoral-growth-in-human-prolactinomas
#20
REVIEW
María José García-Barrado, Enrique J Blanco, María Carmen Iglesias-Osma, Marta Carretero-Hernández, Leonardo Catalano-Iniesta, Virginia Sanchez-Robledo, Manuel Carretero, Julio Joaquín Herrero, Sixto Carrero, José Carretero
The pituitary gland is part of hypothalamic-pituitary-gonadal axis, which controls development, reproduction, and aging in humans and animals. In addition, the pituitary gland is regulated mainly by hormones and neurotransmitters released from the hypothalamus and by systemic hormones secreted by target glands. Aromatase P450, the enzyme responsible for the catabolization of aromatizable androgens to estrogens, is expressed in different parts of body, including the pituitary gland. Moreover, aromatase P450 is involved in sexual dimorphism where alteration in the level of aromatase can initiate a number of diseases in both genders...
November 1, 2017: International Journal of Molecular Sciences
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