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https://www.readbyqxmd.com/read/29667754/estrogen-regulated-expression-of-p450arom-genes-in-the-brain-and-ovaries-of-adult-female-indian-climbing-perch-anabas-testudineus
#1
Puja Pal, Sujata Roy Moulik, Shreyasi Gupta, Payel Guha, Suravi Majumder, Sourav Kundu, Buddhadev Mallick, Kousik Pramanick, Dilip Mukherjee
Cytochrome P450arom (CYP19), a product of cyp19a1 gene, catalyzes the conversion of androgens to estrogens and is essential for regulation of reproductive function in vertebrates. In the present study, we isolated partial cDNA encoding the ovarian (cyp19a1a) and brain (cyp19a1b) P450arom genes from adult female perch, Anabas testudineus and investigated their regulation by estrogen in vivo. Results demonstrated that cyp19a1a and cyp19a1b predominate in ovary and brain respectively, with quantity of both attuned to reproductive cycle...
April 18, 2018: Journal of Experimental Zoology. Part A, Ecological and Integrative Physiology
https://www.readbyqxmd.com/read/29667061/dietary-patterns-and-serum-of-ddt-concentrations-among-reproductive-aged-group-of-women-in-bangladesh
#2
Rehnuma Haque, Tsukasa Inaoka, Miho Fujimura, Chiho Watanabe, Akhtar Sk Ahmad, Risa Kakimoto, Momoko Ishiyama, Daisuke Ueno
This research was conducted in order to propose ways to reduce human exposure to DDT, especially for women of reproductive age in Bangladesh, and to find a relation between DDT exposure levels in serum and questionnaire information including sociodemographic and food frequency (FFQ). In this study, a significant relationship was found between the education level and BMI, and the serum p,p'-DDE concentration. This result suggests that people with higher education (relating to higher income) and BMI in Bangladesh actively buy expensive foodstuff, like meat and/or fatty fish, which relates to a higher fat intake...
April 18, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29663728/physiological-and-biochemical-responses-of-dosinia-corrugata-to-different-thermal-and-salinity-stressors
#3
Hongtao Nie, Shuqi Zuo, Long Li, Cun Tian, Chen Cao, Xiwu Yan
Temperature and salinity are major factors affecting geographic distribution, reproduction, and physiological processes of marine and estuarine organisms. In this study, the effects of different temperatures and salinity on the respiratory metabolism and physiological response were evaluated in D. corrugata by measuring oxygen consumption rate (OCR), ammonia excretion rate (AER), and glycolytic enzyme activity. An increase in the OCR of D. corrugata with increasing temperature was observed. No peak of oxygen consumption was observed in D...
April 16, 2018: Journal of Experimental Zoology. Part A, Ecological and Integrative Physiology
https://www.readbyqxmd.com/read/29663041/imidacloprid-causes-dna-damage-in-fish-clastogenesis-as-a-mechanism-of-genotoxicity
#4
Fernando G Iturburu, María F Simoniello, Sandra Medici, Ana M Panzeri, Mirta L Menone
Neonicotinoids are one of the most widely used insecticides in the world. DNA damage is considered an early biological effect which could lead to reproductive and carcinogenic effects. The present study aimed to evaluate DNA damage and bases oxidation as a mechanism of genotoxicity, on the freshwater fish Australoheros facetus acutely exposed to imidacloprid (IMI). The Comet assay with the nuclease ENDO III enzyme was performed for detecting pyrimidine bases oxidation using blood samples. Micronucleus and other nuclear abnormalities frequencies were also quantified...
April 16, 2018: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/29662093/application-of-interspecific-somatic-cell-nuclear-transfer-iscnt-in-sturgeons-and-an-unexpectedly-produced-gynogenetic-sterlet-with-homozygous-quadruple-haploid
#5
Effrosyni Fatira, Miloš Havelka, Catherine Labbé, Alexandra Depincé, Viktoriia Iegorova, Martin Pšenička, Taiju Saito
Somatic cell nuclear transfer (SCNT) is a very promising cloning technique for reconstruction of endangered animals. The aim of the present research is to implement the interspecific SCNT (iSCNT) technique to sturgeon; one fish family bearing some of the most critically endangered species. We transplanted single cells enzymatically isolated from a dissociated fin-fragment of the Russian sturgeon (Acipenser gueldenstaedtii) into non-enucleated eggs of the sterlet (Acipenser ruthenus), two species bearing different ploidy (4n and 2n, respectively)...
April 16, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29662075/the-unique-functioning-of-a-pre-columbian-amazonian-floodplain-fishery
#6
Rumsaïs Blatrix, Bruno Roux, Philippe Béarez, Gabriela Prestes-Carneiro, Marcelo Amaya, Jose Luis Aramayo, Leonor Rodrigues, Umberto Lombardo, Jose Iriarte, Jonas Gregorio de Souza, Mark Robinson, Cyril Bernard, Marc Pouilly, Mélisse Durécu, Carl F Huchzermeyer, Mashuta Kalebe, Alex Ovando, Doyle McKey
Archaeology provides few examples of large-scale fisheries at the frontier between catching and farming of fish. We analysed the spatial organization of earthen embankments to infer the functioning of a landscape-level pre-Columbian Amazonian fishery that was based on capture of out-migrating fish after reproduction in seasonal floodplains. Long earthen weirs cross floodplains. We showed that weirs bear successive V-shaped features (termed 'Vs' for the sake of brevity) pointing downstream for outflowing water and that ponds are associated with Vs, the V often forming the pond's downstream wall...
April 16, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29660307/gonadotropin-receptors-of-labeo-rohita-cloning-and-characterization-of-full-length-cdnas-and-their-expression-analysis-during-annual-reproductive-cycle
#7
Avinash Pradhan, Madhusmita Nayak, Mrinal Samanta, Rudra Prasanna Panda, Suresh Chandra Rath, Shiba Shankar Giri, Ashis Saha
Follicle-stimulating hormone (Fsh) and luteinizing hormone (Lh), secreted from pituitary, stimulate gonadal function by binding to their cognate receptors FSH receptor (FSHR), and LH/ choriogonadotropin receptor (LHCGR). Rohu (Labeo rohita) is a commercially important seasonal breeder freshwater fish species, but till date, the regulation of expression of gonadotropins and their receptors gene during different phases of annual reproductive cycle has not been investigated. We envisaged the critical role of these molecules during seasonal gonadal development in this carp species...
April 13, 2018: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/29659620/why-do-placentas-evolve-evidence-for-a-morphological-advantage-during-pregnancy-in-live-bearing-fish
#8
Mike Fleuren, Elsa M Quicazan-Rubio, Johan L van Leeuwen, Bart J A Pollux
A live-bearing reproductive strategy can induce large morphological changes in the mother during pregnancy. The evolution of the placenta in swimming animals involves a shift in the timing of maternal provisioning from pre-fertilization (females supply their eggs with sufficient yolk reserves prior to fertilization) to post-fertilization (females provide all nutrients via a placenta during the pregnancy). It has been hypothesised that this shift, associated with the evolution of the placenta, should confer a morphological advantage to the females leading to a more slender body shape during the early stages of pregnancy...
2018: PloS One
https://www.readbyqxmd.com/read/29657813/extreme-fertilization-bias-towards-freshly-inseminated-sperm-in-a-species-exhibiting-prolonged-female-sperm-storage
#9
Clelia Gasparini, Emma Daymond, Jonathan P Evans
The storage of sperm by females across successive reproductive cycles is well documented in internal fertilizers, yet the fate of stored sperm when they compete with 'new' sperm to fertilize a female's eggs has rarely been considered. This gap in our understanding is likely due to the logistical difficulties of controlling behavioural interactions during or after mating, which in turn may influence how many sperm are inseminated and how stored sperm are ultimately used during successive bouts of sperm competition with freshly inseminated sperm...
March 2018: Royal Society Open Science
https://www.readbyqxmd.com/read/29649968/swimming-exercise-to-control-precocious-maturation-in-male-seabass-dicentrarchus-labrax
#10
Marco Graziano, Raul Benito, Josep V Planas, Arjan P Palstra
BACKGROUND: Male European seabass, already predominant (~ 70%) in cultured stocks, show a high incidence (20-30%) of precocious sexual maturation under current aquaculture practices, leading to important economic losses for the industry. In view of the known modulation of reproductive development by swimming exercise in other teleost species, we aimed at investigating the effects of sustained swimming on reproductive development in seabass males during the first year of life in order to determine if swimming could potentially reduce precocious sexual maturation...
April 12, 2018: BMC Developmental Biology
https://www.readbyqxmd.com/read/29649335/molecular-characterization-of-the-lipophorin-receptor-in-the-crustacean-ectoparasite-lepeophtheirus-salmonis
#11
Muhammad Tanveer Khan, Sussie Dalvin, Qaiser Waheed, Frank Nilsen, Rune Male
The Salmon louse (Lepeophtheirus salmonis) is a marine ectoparasite of salmonid fish in the Northern Hemisphere and considered as a major challenge in aquaculture and a threat to wild populations of salmonids. Adult female lice produce a large number of lipid-rich eggs, however, the mechanism of maternal lipid transport into developing eggs during salmon louse reproduction has not been described. In the present study, a full-length L. salmonis lipophorin receptor (LsLpR) consisting of 16 exons was obtained by RACE and RT-PCR...
2018: PloS One
https://www.readbyqxmd.com/read/29643072/life-history-variation-is-maintained-by-fitness-trade-offs-and-negative-frequency-dependent-selection
#12
Mark R Christie, Gordon G McNickle, Rod A French, Michael S Blouin
The maintenance of diverse life history strategies within and among species remains a fundamental question in ecology and evolutionary biology. By using a near-complete 16-year pedigree of 12,579 winter-run steelhead ( Oncorhynchus mykiss ) from the Hood River, Oregon, we examined the continued maintenance of two life history traits: the number of lifetime spawning events (semelparous vs. iteroparous) and age at first spawning (2-5 years). We found that repeat-spawning fish had more than 2.5 times the lifetime reproductive success of single-spawning fish...
April 11, 2018: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29627338/a-comparative-review-on-estrogen-receptors-in-the-reproductive-male-tract-of-non-mammalian-vertebrates
#13
REVIEW
Mariailaria Verderame, Rosaria Scudiero
Estrogen receptors alpha (ERα) and beta (ERβ) are transcription factors known to be involved in the regulation of many complex physiological processes in mammals. They are expressed primarily in the reproductive tract of all vertebrates females, thus indicating important and conserved functions in female reproductive success. ERs are also present in physiological different tissues as bone, brain, liver, skin and adipose tissues, in both females and males. In the latter, ERs have been found also in the genital tract, supporting the findings of a complex role for estrogen in spermatogenesis and, more generally, in male reproduction...
April 5, 2018: Steroids
https://www.readbyqxmd.com/read/29622351/proteomics-a-valuable-approach-to-elucidate-spermatozoa-post-testicular-maturation-in-the-endangered-acipenseridae-family
#14
REVIEW
Pietro Boccaletto, Mohammad Abdul Momin Siddique, Jacky Cosson
Proteomics techniques, such as two-dimensional polyacrylamide gel electrophoresis, mass spectrometry, and differential gel electrophoresis, have been extensively used to describe the protein composition of male gametes in different animals, mainly mammals. They have also provided a deeper understanding of protein functions involved in sperm processes, as in processes that in humans lead to male infertility. However, few studies focus on fish sperm proteomics and even fewer have tried to explore the proteomic profile of Sturgeon spermatozoa...
March 31, 2018: Animal Reproduction Science
https://www.readbyqxmd.com/read/29621674/part-a-temporal-and-dose-dependent-transcriptional-responses-in-the-liver-of-fathead-minnows-following-short-term-exposure-to-the-polycyclic-aromatic-hydrocarbon-phenanthrene
#15
Jennifer R Loughery, Karen A Kidd, Angella Mercer, Christopher J Martyniuk
Phenanthrene is a low molecular weight polycyclic aromatic hydrocarbon (PAH) that is composed of three fused benzene rings. PAHs are formed naturally through incomplete combustion of organic materials, and are environmental contaminants due to anthropogenic activities (e.g. oil extraction and refining, industrial and municipal effluents, fossil fuel burning). Fish exposed to PAHs such as phenanthrene have been reported to exhibit altered reproductive axis endpoints, however the mechanisms that underlie these responses are not fully characterized...
March 22, 2018: Aquatic Toxicology
https://www.readbyqxmd.com/read/29621673/part-b-morphometric-and-transcriptomic-responses-to-sub-chronic-exposure-to-the-polycyclic-aromatic-hydrocarbon-phenanthrene-in-the-fathead-minnow-pimephales-promelas
#16
Jennifer R Loughery, Karen A Kidd, Angella Mercer, Chris J Martyniuk
Phenanthrene is a tricyclic polycyclic aromatic hydrocarbon and environmental contaminant found in high concentrations around urban catchments and in the vicinity of oil extraction activities. Fish exposed to phenanthrene can exhibit altered reproductive hormone profiles and/or differences within gonadosomatic index and altered gamete proportions, but the mechanisms underlying these changes are not fully understood. In this study, we conducted a sub-chronic bioassay and measured transcriptional responses in the liver, the major tissue involved in generating lipids for oocyte growth...
March 23, 2018: Aquatic Toxicology
https://www.readbyqxmd.com/read/29616077/karyotypic-diversity-and-evolution-in-a-sympatric-assemblage-of-neotropical-electric-knifefish
#17
Adauto L Cardoso, Julio C Pieczarka, William G R Crampton, Jonathan S Ready, Wilsea M B de Figueiredo Ready, Joseph C Waddell, Jonas A de Oliveira, Cleusa Y Nagamachi
Chromosome changes can perform an important role in speciation by acting as post-zygotic reproductive barriers. The Neotropical electric fish genus Brachyhypopomus (Gymnotiformes, Hypopomidae) has 28 described species, but cytogenetic data are hitherto available only for four of them. To understand karyotype evolution and investigate the possible role of chromosome changes in the diversification of this genus, we describe here the karyotype of eight species of Brachyhypopomus from a sympatric assemblage in the central Amazon basin...
2018: Frontiers in Genetics
https://www.readbyqxmd.com/read/29608975/chonopeltis-australis-crustacea-branchiura-the-female-reproductive-system
#18
Lourelle Alicia Martins Neethling, Annemariè Avenant-Oldewage
The female reproductive system has been described for Dolops ranarum (Stuhlman, 1891) and various Argulus spp. but, there is no description of the reproductive system for Dipteropeltis spp. Calman, 1912 or Chonopeltis spp. Thiele, 1900. This paper describes the female reproductive system and egg laying behaviour of C.australis Boxshall, 1976 using histology, light microscopy, scanning electron microscopy and observations. The histological study of six specimens showed that the organ structure is similar to that of Argulus spp...
March 30, 2018: Arthropod Structure & Development
https://www.readbyqxmd.com/read/29606908/molecular-cytogenetic-analysis-of-one-african-and-five-asian-macaque-species-reveals-identical-karyotypes-as-in-mandrill
#19
Wiwat Sangpakdee, Alongkoad Tanomtong, Arunrat Chaveerach, Krit Pinthong, Vladimir Trifonov, Kristina Loth, Christiana Hensel, Thomas Liehr, Anja Weise, Xiaobo Fan
Background: The question how evolution and speciation work is one of the major interests of biology. Especially, genetic including karyotypic evolution within primates is of special interest due to the close phylogenetic position of Macaca and Homo sapiens and the role as in vivo models in medical research, neuroscience, behavior, pharmacology, reproduction and Acquired Immune Deficiency Syndrome (AIDS). Materials & Methods: Karyotypes of five macaque species from South East Asia and of one macaque species as well as mandrill from Africa were analyzed by high resolution molecular cytogenetics to obtain new insights into karyotypic evolution of old world monkeys...
April 2018: Current Genomics
https://www.readbyqxmd.com/read/29604998/evaluation-of-an-antiparasitic-compound-extracted-from-polygonum-cuspidatum-against-ichthyophthirius-multifiliis-in-grass-carp
#20
Sheng-Yu Zhou, Yan-Meng Liu, Qi-Zhong Zhang, Yao-Wu Fu, De-Jie Lin
Ichthyophthirius multifiliis is a ciliated parasite that infests almost all freshwater fish species and causes great economic losses to the aquaculture industry. In this study, a compound with anti-I. multifiliis activity was isolated from Polygonum cuspidatum and identified as emodin. In vitro anti-I. multifiliis results showed that emodin at 1 mg/L killed all I. multifiliis theronts for 96.0 min, and at 0.5 mg/L or lower concentrations could not kill all I. multifiliis theronts, but could significantly reduce the infectivity of theronts after pretreatment with emodin at the low concentrations mentioned above for 2 h...
April 15, 2018: Veterinary Parasitology
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