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Evolution & Development

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https://www.readbyqxmd.com/read/30221814/the-evolution-of-selector-gene-function-expression-dynamics-and-regulatory-interactions-of-tiptop-teashirt-across-arthropoda
#1
Logan E March, Rachel M Smaby, Emily V W Setton, Prashant P Sharma
The transcription factors spineless (ss) and tiptop/teashirt (tio/tsh) have been shown to be selectors of distal appendage identity in an insect, but it is unknown how they regulate one another. Here, we examined the regulatory relationships between these two determinants in the milkweed bug Oncopeltus faciatus, using maternal RNA interference (RNAi). We show that Ofas-ss RNAi embryos bear distally transformed antennal buds with heterogeneous Ofas-tio/tsh expression domains comparable to wild type legs. In the reciprocal experiment, Ofas-tio/tsh RNAi embryos bear distally transformed walking limb buds with ectopic expression of Ofas-ss in the distal leg primordia...
September 17, 2018: Evolution & Development
https://www.readbyqxmd.com/read/30191662/the-developmental-and-genetic-trajectory-of-coloration-in-the-guppy-poecilia-reticulata
#2
Cynthia Dick, Jeff Arendt, David N Reznick, Cheryl Y Hayashi
Examining the association between trait variation and development is crucial for understanding the evolution of phenotypic differences. Male guppy ornamental caudal fin coloration is one trait that shows a striking degree of variation within and between guppy populations. Males initially have no caudal fin coloration, then gradually develop it as they reach sexual maturity. For males, there is a trade-off between female preference for caudal fin coloration and increased visibility to predators. This trade-off may reach unique endpoints in males from different predation regimes...
September 6, 2018: Evolution & Development
https://www.readbyqxmd.com/read/30168254/bapx1-is-required-for-jaw-joint-development-in-amphibians
#3
Paul Lukas, Lennart Olsson
The acquisition of a movable jaw and a jaw joint are key events in gnathostome evolution. Jaws are derived from the neural crest derived pharyngeal skeleton and the transition from jawless to jawed vertebrates consists of major morphological changes, which must have a genetic foundation. Recent studies on the effects of bapx1 knockdown in fish and chicken indicate that bapx1 has acquired such a role in primary jaw joint development during vertebrate evolution, but evidence from amphibians is missing so far...
August 30, 2018: Evolution & Development
https://www.readbyqxmd.com/read/30094964/gene-network-variation-and-alternative-paths-to-convergent-evolution-in-turtles
#4
Gerardo A Cordero, Haibo Liu, Kokulapalan Wimalanathan, Rachel Weber, Kevin Quinteros, Fredric J Janzen
Diversification of the turtle's shell comprises remarkable phenotypic transformations. For instance, two divergent species convergently evolved shell-closing systems with shoulder blade (scapula) segments that enable coordinated movements with the shell. We expected these unusual structures to originate via similar changes in underlying gene networks, as skeletal segment formation is an evolutionarily conserved developmental process. We tested this hypothesis by comparing transcriptomes of scapula tissue across three stages of embryonic development in three emydid turtles from natural populations...
August 9, 2018: Evolution & Development
https://www.readbyqxmd.com/read/29998528/upper-jaw-development-in-the-absence-of-teeth-new-insights-for-craniodental-evo-devo-integration
#5
Alyssa Phen, Justine Greer, Jasmene Uppal, Jasmine Der, Julia C Boughner
In p63-null mice (p63-/- ), teeth fail to form but the mandible forms normally; conversely, the upper jaw skeleton is malformed. Here we explored whether lack of dental tissues contributed to midfacial dysmorphologies in p63-/- mice by testing if facial prominence defects appeared before odontogenesis failed. We also investigated gene dose effects by testing if one wild type (WT) p63 allele (p63+/- ) was sufficient for normal upper jaw skeleton formation. We micro-CT scanned PFA-fixed p63-/- , p63+/- , and WT (p63+/+ ) adult and embryonic mice aged E10-E14...
July 11, 2018: Evolution & Development
https://www.readbyqxmd.com/read/30175901/connecting-pattern-to-process-growth-of-spiral-shell-sculpture-in-the-gastropod-nucella-ostrina-muricidae-ocenebrinae
#6
Nicole B Webster, A Richard Palmer
Shell morphology is a well-suited and underused system to examine the development of novel forms. The three-dimensional structure produced (the shell) is separate from the largely two-dimensional tissue that secretes it (the mantle), allowing us to disentangle the pattern from the process. Despite knowing a great deal about the mechanics of shell secretion (process), and the variety of shell shapes that exist (pattern), no effort has been made to understand how the mantle changes to produce different shell shapes...
September 2018: Evolution & Development
https://www.readbyqxmd.com/read/30175900/a-farewell-to-evo-devo
#7
EDITORIAL
Rudy Raff
No abstract text is available yet for this article.
September 2018: Evolution & Development
https://www.readbyqxmd.com/read/30094969/expression-of-vasa-piwi-and-nanos-during-gametogenesis-in-typosyllis-antoni-annelida-syllidae
#8
Guillermo Ponz-Segrelles, Christoph Bleidorn, M Teresa Aguado
Although model species have proven to be crucial for developmental biology, the evo-devo approach requires a broader picture across phylogeny. Herein, we try to expand the range of studied annelids by presenting a transcriptome of Typosyllis antoni as a tool for the study of developmental and evolutionary processes in Syllidae. Moreover, we provide homologs of the stem-cell markers vasa, piwi, and nanos, and investigate their expression patterns in gamete-producing individuals for the first time in this group...
September 2018: Evolution & Development
https://www.readbyqxmd.com/read/29806731/effects-of-nodal-inhibition-on-development-of-temnopleurid-sea-urchins
#9
Mami Kasahara, Chiaki Kobayashi, Chikara Sakaguchi, Chisato Miyahara, Akira Yamanaka, Chisato Kitazawa
Adult rudiment formation in some temnopleurids begins with the formation of a cell mass that is pinched off the left ectoderm in early larval development. The cell mass forms the adult rudiment with the left coelomic pouch of the mesodermal region. However, details of the mechanisms to establish position of the cell mass are still unknown. We analyzed the inhibiting effect of Nodal, a factor for morphogenesis of the oral region and right side, for location of the cell mass, in four temnopleurids. Pulse inhibition, at least 5 min inhibition, during coelomic pouch formation allowed a cell mass to form on both sides, whereas treatments after that period did not...
May 2018: Evolution & Development
https://www.readbyqxmd.com/read/29569814/molecular-cloning-characterization-and-expression-profiles-of-the-sox3-gene-in-chinese-loach-paramisgurnus-dabryanus
#10
Xiaohua Xia, Weiran Huo, Ruyan Wan, Peijin Wang, Linxia Zhang, Zhongjie Chang
A number of studies have established that in vertebrates, Sox3 is involved in a wide range of developmental processes, including sex differentiation and neurogenesis. However, the exact functions of the Sox3 gene have not been documented so far in teleosts. Here, we cloned the full length cDNA of Sox3 from the teleost fish, Paramisgurnus dabryanus, which we designated PdSox3. Sequence analysis revealed that PdSox3 encodes a hydrophilic protein, and shares high homology with Sox3 in other species, ranging from mammals to fishes...
May 2018: Evolution & Development
https://www.readbyqxmd.com/read/29527799/early-limb-patterning-in-the-direct-developing-salamander-plethodon-cinereus-revealed-by-sox9-and-col2a1
#11
Ryan R Kerney, James Hanken, David C Blackburn
Direct-developing amphibians form limbs during early embryonic stages, as opposed to the later, often postembryonic limb formation of metamorphosing species. Limb patterning is dramatically altered in direct-developing frogs, but little attention has been given to direct-developing salamanders. We use expression patterns of two genes, sox9 and col2a1, to assess skeletal patterning during embryonic limb development in the direct-developing salamander Plethodon cinereus. Limb patterning in P. cinereus partially resembles that described in other urodele species, with early formation of digit II and a generally anterior-to-posterior formation of preaxial digits...
May 2018: Evolution & Development
https://www.readbyqxmd.com/read/29498211/producing-offspring-in-armadillidium-vulgare-effects-of-genetic-diversity-and-inbreeding
#12
Sylvine Durand, Vincent Loiseau, Cybèle Prigot, Christine Braquart-Varnier, Sophie Beltran-Bech
Genetic diversity is known to be correlated to fitness traits, and inbred individuals often display lower values for life history traits. In this study, we attempt to quantify how inbreeding affects such traits in the terrestrial isopod Armadillidium vulgare by performing inbred and non-inbred crosses under laboratory conditions. We estimated genetic characteristics of parents and offspring, and related them to fecundity and fertility measures, as well as offspring growth and survival. Our study shows that a decrease in offspring number might result from mortality around birth, but not to changes in fecundity, fertilization rate, or developmental failure between inbred and non-inbred crosses...
March 2018: Evolution & Development
https://www.readbyqxmd.com/read/29372584/evolving-doublesex-expression-correlates-with-the-origin-and-diversification-of-male-sexual-ornaments-in-the-drosophila-immigrans-species-group
#13
Gavin Rice, Olga Barmina, Kevin Hu, Artyom Kopp
Male ornaments and other sex-specific traits present some of the most dramatic examples of evolutionary innovations. Comparative studies of similar but independently evolved traits are particularly important for identifying repeated patterns in the evolution of these traits. Male-specific modifications of the front legs have evolved repeatedly in Drosophilidae and other Diptera. The best understood of these novel structures is the sex comb of Drosophila melanogaster and its close relatives. Here, we examine the evolution of another male foreleg modification, the sex brush, found in the distantly related Drosophila immigrans species group...
March 2018: Evolution & Development
https://www.readbyqxmd.com/read/29318754/coordination-of-bilateral-tooth-replacement-in-the-juvenile-gecko-is-continuous-with-in-ovo-patterning
#14
Theresa M Grieco, Joy M Richman
We performed a test of how function impacts a genetically programmed process that continues into postnatal life. Using the dentition of the polyphyodont gecko as our model, tooth shedding was recorded longitudinally across the jaw. We compared two time periods: one in which teeth were patterned symmetrically in ovo and a later period when teeth were initiated post-hatching. By pairing shedding events on the right and left sides, we found the patterns of tooth loss are symmetrical and stable between periods, with only subtle deviations...
March 2018: Evolution & Development
https://www.readbyqxmd.com/read/29243890/the-evolution-of-floral-ontogenetic-allometry-in-the-andean-genus-caiophora-loasaceae-subfam-loasoideae
#15
Marina Micaela Strelin, Santiago Benitez-Vieyra, Juan Fornoni, Christian Peter Klingenberg, Andrea Cocucci
The astounding variety of angiosperm flower morphologies has evolved in response to many selective forces. Flower development is highly coordinated and involves developmental associations between size and shape, ontogenetic allometry, which in turn affect the morphology of mature flowers. Although ontogenetic allometries can act as a developmental constraint and may influence adaptive evolution, allometries can evolve themselves and may change rapidly in response to selection. We explored the evolution of ontogenetic allometry in the flowers of 11 species of Loasoideae...
January 2018: Evolution & Development
https://www.readbyqxmd.com/read/29243871/expression-of-six3-and-otx-in-solenogastres-mollusca-supports-an-ancestral-role-in-bilaterian-anterior-posterior-axis-patterning
#16
Emanuel Redl, Maik Scherholz, Tim Wollesen, Christiane Todt, Andreas Wanninger
The homeodomain transcription factors six3 and otx are involved in patterning the anterior body and parts of the central nervous system (CNS) in bilaterians. Their similar expression patterns have been used as an argument for homology of heads, brains, segmentation, and ciliated larvae. We investigated the developmental expression of six3 and otx in the aplacophoran mollusk Wirenia argentea. Six3 is expressed in subepithelial cells delimiting the apical organ of the solenogaster pericalymma larva. Otx is expressed in cells of the prototroch and adjacent regions as well as in posterior extensions of the prototrochal expression domain...
January 2018: Evolution & Development
https://www.readbyqxmd.com/read/29194953/reptile-embryos-are-not-capable-of-behavioral-thermoregulation-in-the-egg
#17
Gerardo A Cordero, Rory S Telemeco, Eric J Gangloff
Reptile embryos have recently been observed moving within the egg in response to temperature, raising the exciting possibility that embryos might behaviorally thermoregulate analogous to adults. However, the conjecture that reptile embryos have ample opportunity and capacity to adaptively control their body temperature warrants further discussion. Using turtles as a model, we discuss the spatiotemporal constraints to movement in reptile embryos. We demonstrate that, as embryos grow, the internal egg space rapidly diminishes such that the temporal window for appreciable displacement is confined to stages that feature incomplete neuromuscular differentiation...
January 2018: Evolution & Development
https://www.readbyqxmd.com/read/29168309/soldier-biased-gene-expression-in-a-subterranean-termite-implies-functional-specialization-of-the-defensive-caste
#18
Tian Wu, Gurpreet K Dhami, Graham J Thompson
In a termite colony, reproduction is typically monopolized by a small number of sexuals that are supported by reproductively altruistic soldiers and workers. We expect caste differentiation to be associated with clear-cut differences in gene expression, and for these differences to reflect caste function and development. Here, we use RNA-Sequencing to compare the gene expression profiles of sexual nymphs and two non-reproductive helper castes (i.e., workers and soldiers) of the Eastern subterranean termite Reticulitermes flavipes...
January 2018: Evolution & Development
https://www.readbyqxmd.com/read/29115024/developmental-timing-differences-underlie-armor-loss-across-threespine-stickleback-populations
#19
Mark C Currey, Susan Bassham, Stephen Perry, William A Cresko
Comparing ontogenetic patterns within a well-described evolutionary context aids in inferring mechanisms of change, including heterochronies or deletion of developmental pathways. Because selection acts on phenotypes throughout ontogeny, any within-taxon developmental variation has implications for evolvability. We compare ontogenetic order and timing of locomotion and defensive traits in three populations of threespine stickleback that have evolutionarily divergent adult forms. This analysis adds to the growing understanding of developmental genetic mechanisms of adaptive change in this evolutionary model species by delineating when chondrogenesis and osteogenesis in two derived populations begin to deviate from the developmental pattern in their immediate ancestors...
November 2017: Evolution & Development
https://www.readbyqxmd.com/read/29115023/secondary-queens-in-the-parthenogenetic-termite-cavitermes-tuberosus-develop-through-a-transitional-helper-stage
#20
Simon Hellemans, Denis Fournier, Robert Hanus, Yves Roisin
In termite species with asexual queen succession (AQS), parthenogenetically produced immatures mostly differentiate into secondary queens, called "neotenics." In order to elucidate the ontogenetic origin of neotenics in Cavitermes tuberosus (Termitidae: Termitinae), a neotropical termite with AQS, we investigated developmental pathways of offspring according to their sex and genetic origin using both morphometric and genetic tools. The caste system of C. tuberosus follows the classical pathway of Termitidae...
November 2017: Evolution & Development
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