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Metamorphosis

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https://www.readbyqxmd.com/read/28091775/developmental-and-sex-specific-differences-in-expression-of-neuropeptides-derived-from-allatotropin-gene-in-the-silkmoth-bombyx-mori
#1
Branislav Bednár, Ladislav Roller, Daniel Čižmár, Diana Mitrová, Dušan Žitňan
Allatotropin (AT) and related neuropeptides are widespread bioactive molecules that regulate development, food intake and muscle contractions in insects and other invertebrates. In moths, alternative splicing of the at gene generates three mRNA precursors encoding AT with different combinations of three structurally similar AT-like peptides (ATLI-III). We used in situ hybridization and immunohistochemistry to map the differential expression of these transcripts during the postembryonic development of Bombyx mori...
January 16, 2017: Cell and Tissue Research
https://www.readbyqxmd.com/read/28091574/an-inert-pesticide-adjuvant-synergizes-viral-pathogenicity-and-mortality-in-honey-bee-larvae
#2
Julia D Fine, Diana L Cox-Foster, Christopher A Mullin
Honey bees are highly valued for their pollination services in agricultural settings, and recent declines in managed populations have caused concern. Colony losses following a major pollination event in the United States, almond pollination, have been characterized by brood mortality with specific symptoms, followed by eventual colony loss weeks later. In this study, we demonstrate that these symptoms can be produced by chronically exposing brood to both an organosilicone surfactant adjuvant (OSS) commonly used on many agricultural crops including wine grapes, tree nuts and tree fruits and exogenous viral pathogens by simulating a horizontal transmission event...
January 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28089896/characterization-and-expression-analysis-of-a-chitinase-gene-pmchi-4-from-black-tiger-shrimp-penaeus-monodon-under-pathogen-infection-and-ambient-ammonia-nitrogen-stress
#3
Kaimin Zhou, Falin Zhou, Jianhua Huang, Qibin Yang, Song Jiang, Lihua Qiu, Lishi Yang, Caiyan Zhu, Shigui Jiang
Chitinase is a multi-gene family, which play important physiological roles in crustaceans, involved in several biological processes, including digestion, molting and defense against viruses. In the present study, a chitinase-4 gene (PmChi-4) was cloned from Penaeus monodon by rapid amplification of cDNA ends (RACE). The full length of PmChi-4 cDNA was 2178 bp, including an 1815 bp open reading frame (ORF) which encoded 604 amino acid residues. The predicted PmChi-4 protein was 67.7 kDa and shared 61%-88% identity with the type of Chi-4s from other crustaceans...
January 9, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/28088106/uv-a-induced-delayed-development-in-the-larvae-of-coral-seriatopora-caliendrum
#4
Jie Zhou, Tung-Yung Fan, John Beardall, Kunshan Gao
Coral reefs are vulnerable to ultraviolet radiation (UVR, 280-400nm). Not only do the fluxes of UVR fluctuate daily, they are also increasing due to global ocean and atmospheric changes. The deleterious effects of UVR on scleractinian corals have been intensively studied, but much less is known about the response of corals in the early pre-settlement phase. In this study, we tested how UVR exposure affects survival and development of Seriatopora caliendrum larvae and examined the photophysiological changes induced in the symbiotic dinoflagellate Symbiodinium...
January 4, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28078890/metamorphosis-affects-metal-concentrations-and-isotopic-signatures-in-a-mayfly-baetis-tricaudatus-implications-for-the-aquatic-terrestrial-transfer-of-metals
#5
Jeff S Wesner, David M Walters, Travis S Schmidt, Johanna M Kraus, Craig A Stricker, William H Clements, Ruth E Wolf
Insect metamorphosis often results in substantial chemical changes that can alter contaminant concentrations and fractionate isotopes. We exposed larval mayflies (Baetis tricaudatus) and their food (periphyton) to an aqueous zinc gradient (3-340 µg Zn/l) and measured zinc concentrations at different stages of metamorphosis: larval, subimago, and imago. We also measured changes in stable isotopes (δ15N and δ13C) in unexposed mayflies. Larval zinc concentrations were positively related to aqueous zinc, increasing 9-fold across the exposure gradient...
January 12, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28076349/mechanical-control-of-whole-body-shape-by-a-single-cuticular-protein-obstructor-e-in-drosophila-melanogaster
#6
Reiko Tajiri, Nobuhiro Ogawa, Haruhiko Fujiwara, Tetsuya Kojima
Body shapes are much more variable than body plans. One way to alter body shapes independently of body plans would be to mechanically deform bodies. To what extent body shapes are regulated physically, or molecules involved in physical control of morphogenesis, remain elusive. During fly metamorphosis, the cuticle (exoskeleton) covering the larval body contracts longitudinally and expands laterally to become the ellipsoidal pupal case (puparium). Here we show that Drosophila melanogaster Obstructor-E (Obst-E) is a protein constituent of the larval cuticle that confers the oriented contractility/expandability...
January 2017: PLoS Genetics
https://www.readbyqxmd.com/read/28074850/juvenile-hormone-biosynthesis-in-adult-blattella-germanica-requires-nuclear-receptors-seven-up-and-ftz-f1
#7
Ferran Borras-Castells, Claudia Nieva, José L Maestro, Oscar Maestro, Xavier Belles, David Martín
In insects, the transition from juvenile development to the adult stage is controlled by juvenile hormone (JH) synthesized from the corpora allata (CA) glands. Whereas a JH-free period during the last juvenile instar triggers metamorphosis and the end of the growth period, the reappearance of this hormone after the imaginal molt marks the onset of reproductive adulthood. Despite the importance of such transition, the regulatory mechanism that controls it remains mostly unknown. Here, using the hemimetabolous insect Blattella germanica, we show that nuclear hormone receptors Seven-up-B (BgSvp-B) and Fushi tarazu-factor 1 (BgFTZ-F1) have essential roles in the tissue- and stage-specific activation of adult CA JH-biosynthetic activity...
January 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28073502/lethal-effects-of-ichthyotoxic-raphidophytes-chattonella-marina-c-antiqua-and-heterosigma-akashiwo-on-post-embryonic-stages-of-the-japanese-pearl-oyster-pinctada-fucata-martensii
#8
Leila Basti, Kiyohito Nagai, Jiyoji Go, Sho Okano, Tatsuya Oda, Yuji Tanaka, Satoshi Nagai
The inimical effects of the ichthyotoxic harmful algal bloom (HAB)-forming raphidophytes Heterosigma akashiwo, Chattonella marina, and Chattonella antiqua on the early-life stages of the Japanese pearl oyster Pinctada fucata martensii were studied. Fertilized eggs and developing embryos were not affected following exposure to the harmful raphidophytes; however, all three algal species severely affected trochophores and D-larvae, early-stage D-larvae, and late-stage pre-settling larvae. Exposure to C. marina (5×10(2)cellsml(-1)), C...
November 2016: Harmful Algae
https://www.readbyqxmd.com/read/28073394/gregarine-infection-accelerates-larval-development-of-the-cat-flea-ctenocephalides-felis-bouch%C3%A3
#9
M E Alarcón, A Jara-F, R C Briones, A K Dubey, C H Slamovits
A high degree of specialization between host and parasite is a well-known outcome of a long history of coevolution, and it is strikingly illustrated in a coordination of their life cycles. In some cases, the arms race ensued at the establishment of a symbiotic relationship results in the adoption of manipulative strategies by the parasite. We have already learned that Steinina ctenocephali, a gregarine living in the alimentary canal of cat flea, Ctenocephalides felis follows its phenology and metamorphosis...
January 11, 2017: Parasitology
https://www.readbyqxmd.com/read/28066712/de-novo-transcriptome-assembly-of-shrimp-palaemon-serratus
#10
Alejandra Perina, Ana M González-Tizón, Iago F Meilán, Andrés Martínez-Lage
: The shrimp Palaemon serratus is a coastal decapod crustacean with a high commercial value. It is harvested for human consumption. In this study, we used Illumina sequencing technology (HiSeq 2000) to sequence, assemble and annotate the transcriptome of P. serratus. RNA was isolated from muscle of adults individuals and, from a pool of larvae. A total number of 4 cDNA libraries were constructed, using the TruSeq RNA Sample Preparation Kit v2. The raw data in this study was deposited in NCBI SRA database with study accession number of SRP090769...
March 2017: Genomics Data
https://www.readbyqxmd.com/read/28062579/lactobacillus-plantarum-favors-the-early-emergence-of-fit-and-fertile-adult-drosophila-upon-chronic-undernutrition
#11
Mélisandre A Téfit, François Leulier
Animals are naturally surrounded by a variety of microorganisms with which they constantly interact. Among these microbes, some live closely associated with a host and form its microbiota. These communities are now extensively studied, owing to their contributions to shaping various aspects of animal physiology. One of these commensal species, Lactobacillus plantarum, and in particular the L.p.(WJL) strain, has been shown to promote the growth of Drosophila larvae upon nutrient scarcity, allowing earlier metamorphosis and adult emergence compared to axenic individuals...
January 6, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28062304/duplication-of-dio3-genes-in-teleost-fish-and-their-divergent-expression-in-skin-during-flatfish-metamorphosis
#12
R N Alves, J C R Cardoso, T Harboe, R S T Martins, M Manchado, B Norberg, D M Power
Deiodinase 3 (Dio3) plays an essential role during early development in vertebrates by controlling tissue thyroid hormone (TH) availability. The Atlantic halibut (Hippoglossus hippoglossus) possesses duplicate dio3 genes (dio3a and dio3b). Expression analysis indicates that dio3b levels change in abocular skin during metamorphosis and this suggests that this enzyme is associated with the divergent development of larval skin to the juvenile phenotype. In larvae exposed to MMI, a chemical that inhibits TH production and blocks metamorphosis, expression of dio3b in ocular skin is significantly up-regulated suggesting that THs normally modulate this genes expression during this developmental event...
January 3, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/28060923/comparative-postembryonic-skeletal-ontogeny-in-two-sister-lineages-of-old-world-tree-frogs-rhacophoridae-taruga-polypedates
#13
Gayani Senevirathne, Ryan Kerney, Madhava Meegaskumbura
Rhacophoridae, a family of morphologically cryptic frogs, with many genetically distinct evolutionary lineages, is understudied with respect to skeletal morphology, life history traits and skeletal ontogeny. Here we analyze two species each from two sister lineages, Taruga and Polypedates, and compare their postembryonic skeletal ontogeny, larval chondrocrania and adult osteology in the context of a well-resolved phylogeny. We further compare these ontogenetic traits with the direct-developing Pseudophilautus silus...
2017: PloS One
https://www.readbyqxmd.com/read/28060288/drosophila-preparation-and-longitudinal-imaging-of-heart-function-in-vivo-using-optical-coherence-microscopy-ocm
#14
Jing Men, Jason Jerwick, Penghe Wu, Mingming Chen, Aneesh Alex, Yutao Ma, Rudolph E Tanzi, Airong Li, Chao Zhou
Longitudinal study of the heartbeat in small animals contributes to understanding structural and functional changes during heart development. Optical coherence microscopy (OCM) has been demonstrated to be capable of imaging small animal hearts with high spatial resolution and ultrahigh imaging speed. The high image contrast and noninvasive properties make OCM ideal for performing longitudinal studies without requiring tissue dissections or staining. Drosophila has been widely used as a model organism in cardiac developmental studies due to its high number of orthologous human disease genes, its similarity of molecular mechanisms and genetic pathways with vertebrates, its short life cycle, and its low culture cost...
December 12, 2016: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28057263/t-box-genes-in-drosophila-mesoderm-development
#15
I Reim, M Frasch, C Schaub
In Drosophila there are eight genes encoding transcription factors of the T-box family, which are known to exert a variety of crucial developmental functions during ectodermal patterning processes, neuronal cell specification, mesodermal tissue development, and the development of extraembryonic tissues. In this review, we focus on the prominent roles of Drosophila T-box genes in mesodermal tissues. First, we describe the contributions of brachyenteron (byn) and optomotor-blind-related-gene-1 (org-1) to the development of the visceral mesoderm...
2017: Current Topics in Developmental Biology
https://www.readbyqxmd.com/read/28054419/identification-and-initial-characterization-of-matrix-metalloproteinases-in-the-yellow-fever-mosquito-aedes-aegypti
#16
A M Kantor, S Dong, N L Held, E Ishimwe, A L Passarelli, R J Clem, A W E Franz
Aedes aegypti is a major vector for arboviruses such as dengue, chikungunya and Zika viruses. During acquisition of a viremic bloodmeal, an arbovirus infects mosquito midgut cells before disseminating to secondary tissues, including the salivary glands. Once virus is released into the salivary ducts it can be transmitted to another vertebrate host. The midgut is surrounded by a basal lamina (BL) in the extracellular matrix, consisting of a proteinaceous mesh composed of collagen IV and laminin. BL pore size exclusion limit prevents virions from passing through...
February 2017: Insect Molecular Biology
https://www.readbyqxmd.com/read/28042104/laboratory-bioassays-with-three-different-substrates-to-test-the-efficacy-of-insecticides-against-various-stages-of-drosophila-suzukii-diptera-drosophilidae
#17
Aneliya Koleva Pavlova, Melanie Dahlmann, Mirjam Hauck, Annette Reineke
Rapid worldwide spread and polyphagous nature of the spotted wing Drosophila Drosophila suzukii Matsumura (Diptera: Drosophilidae) calls for efficient and selective control strategies to prevent severe economic losses in various fruit crops. The use of insecticides is one option for management of this invasive pest insect. Efficacy of insecticides is usually assessed first in laboratory bioassays, which are compounded by the cryptic nature of D. suzukii larvae and the fact that fruits used in bioassays often start to rot and dissolve before larvae have reached the adult stage...
December 31, 2016: Journal of Insect Science
https://www.readbyqxmd.com/read/28041944/large-scale-identification-of-differentially-expressed-genes-during-pupa-development-reveals-solute-carrier-gene-is-essential-for-pupal-pigmentation-in-chilo-suppressalis
#18
Yang Sun, Shuijin Huang, Shuping Wang, Dianhao Guo, Chang Ge, Huamei Xiao, Wencai Jie, Qiupu Yang, Xiaolu Teng, Fei Li
Insects undergo metamorphosis, involving an abrupt change in body structure through cell growth and differentiation. Rice stem stripped borer (SSB), Chilo suppressalis, is one of the most destructive rice pests. However, little is known about the regulation mechanism of metamorphosis development in this notorious insect pest. Here, we studied the expression of 22,197 SSB genes at seven time points during pupa development with a customized microarray, identifying 622 differentially expressed genes (DEG) during pupa development...
December 29, 2016: Journal of Insect Physiology
https://www.readbyqxmd.com/read/28032930/20-hydroxyecdysone-enhances-the-expression-of-the-chitinase-5-via-broad-complex-zinc-finger-4-during-metamorphosis-in-silkworm-bombyx-mori
#19
X Zhang, S Zheng
Insect chitinases are hydrolytic enzymes required for the degradation of chitin. They are essential for insect moulting and metamorphosis. In this study, the regulation mechanism of a chitinase gene, Bombyx mori chitinase 5 (BmCHT5), was studied. Quantitative reverse transcription PCR (qRT-PCR) analysis showed that BmCHT5 was up-regulated during the larval-larval and larval-pupa transitions and notably induced by 20-hydroxyecdysone (20E). Analysis of the BmCHT5 promoter revealed the presence of one Bombyx mori Broad-Complex Zinc-Finger Isoform 4 (BR-C Z4), two BR-C Z2 and two ecdysone-induced protein 74A (E74A) cis-regulatory elements (CREs) that are related to 20E...
December 29, 2016: Insect Molecular Biology
https://www.readbyqxmd.com/read/28019131/heutagogic-approach-to-developing-capable-learners
#20
Reem Rachel Abraham, Ramnarayan Komattil
The twenty-first century higher education sector has come a long way after undergoing continuous metamorphosis from pedagogy to andragogy. Most of the educational approaches adopted in medical schools are directed towards developing more of competencies and less of capability, which is the ability to use competencies in novel contexts. Competencies alone are not sufficient to thrive in the present day work place as medical profession subsumes complex contexts; it is in this scenario that, medical educators are entrusted with the challenging task of developing "capable learners"...
December 25, 2016: Medical Teacher
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