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developmental embryology

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https://www.readbyqxmd.com/read/27861942/the-ectopic-accessory-parotid-system-with-congenital-cheek-fistula-an-overview-and-current-update
#1
REVIEW
Mainak Dutta
OBJECTIVE: This review attempts to provide a comprehensive, updated overview of the ectopic accessory parotid system (EAPS) from clinical and developmental perspectives and investigates its eligibility to be included in the oculo-auriculo-vertebral spectrum (OAVS). REVIEW METHODS: Results of the keyword-based search in the PubMed/MEDLINE, Google Scholar, LILACS, and Cochrane Library were subjected to the given inclusion and exclusion criteria that corroborated with the definition of EAPS...
November 12, 2016: Laryngoscope
https://www.readbyqxmd.com/read/27859990/prospects-for-improving-neovascularisation-of-the-ischaemic-heart-lessons-from-development
#2
Nicola Smart
Neovascularisation of the ischaemic myocardium post-infarction is necessary to restore blood flow to vulnerable cardiomyocytes and will be indispensable for prospective regenerative strategies, to perfuse newly formed myocardium. Therapeutic attempts to enhance new vessel formation have, to date, yielded modest clinical benefits and innovative approaches are now needed. Intrinsic mechanisms are initiated by the heart in an attempt to rebuild injured vessels but these are poorly understood. Insight into the underlying mechanisms may reveal targets for therapeutically augmenting this low-level neovascular response...
November 17, 2016: Microcirculation: the Official Journal of the Microcirculatory Society, Inc
https://www.readbyqxmd.com/read/27765265/on-the-shoulders-of-hubrecht-from-embryos-to-stem-cells
#3
Catherine Rabouille, Jacqueline Deschamps
One hundred years of the Hubrecht Institute were celebrated in May 2016 with the organization of a one-day symposium "From embryos to stem cells" on the Uithof Campus, Utrecht, the Netherlands. Nine distinguished speakers were invited. They all represent a research branch originating from the passion of Institute founder, Ambrosius Hubrecht, for embryology:, regulation of gene expression, genome structure and function, embryonic and adult stem cells, nuclear reprogramming, and understanding cancer and other diseases using model organisms...
October 17, 2016: Developmental Biology
https://www.readbyqxmd.com/read/27756203/mice-lacking-the-conserved-transcription-factor-grainyhead-like-3-grhl3-display-increased-apposition-of-the-frontal-and-parietal-bones-during-embryonic-development
#4
Stephen J Goldie, Benedicta D Arhatari, Peter Anderson, Alana Auden, Darren D Partridge, Stephen M Jane, Sebastian Dworkin
BACKGROUND: Increased apposition of the frontal and parietal bones of the skull during embryogenesis may be a risk factor for the subsequent development of premature skull fusion, or craniosynostosis. Human craniosynostosis is a prevalent, and often serious embryological and neonatal pathology. Other than known mutations in a small number of contributing genes, the aetiology of craniosynostosis is largely unknown. Therefore, the identification of novel genes which contribute to normal skull patterning, morphology and premature suture apposition is imperative, in order to fully understand the genetic regulation of cranial development...
October 18, 2016: BMC Developmental Biology
https://www.readbyqxmd.com/read/27755577/evidence-for-karyotype-polymorphism-in-the-free-living-flatworm-macrostomum-lignano-a-model-organism-for-evolutionary-and-developmental-biology
#5
Kira S Zadesenets, Dita B Vizoso, Aline Schlatter, Irina D Konopatskaia, Eugene Berezikov, Lukas Schärer, Nikolay B Rubtsov
Over the past decade, the free-living flatworm Macrostomum lignano has been successfully used in many areas of biology, including embryology, stem cells, sexual selection, bioadhesion and aging. The increased use of this powerful laboratory model, including the establishment of genomic resources and tools, makes it essential to have a detailed description of the chromosome organization of this species, previously suggested to have a karyotype with 2n = 8 and one pair of large and three pairs of small metacentric chromosomes...
2016: PloS One
https://www.readbyqxmd.com/read/27741560/a-staging-table-of-post-ovipositional-development-for-the-south-american-collared-lizard-tropidurus-torquatus-squamata-tropiduridae
#6
Tainã Rapp Py-Daniel, Anderson Kennedy Soares De-Lima, Fabiano Campos Lima, Aline Pic-Taylor, Osmindo Rodrigues Pires Junior, Antonio Sebben
The mouse, chicken, African clawed frog, and zebrafish are considered ¨model organisms¨ due to their extensive embryological and genetic characterization. However, they are far from representative of known diversity, impairing phylogenetic analyses of developmental patterns. Since squamates have historically received limited attention in developmental studies, we here describe the developmental sequence for Tropidurus torquatus, and provide the first post-ovipositional developmental series for the lizard family Tropiduridae...
October 14, 2016: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
https://www.readbyqxmd.com/read/27720247/time-lapse-embryo-imaging-and-morphokinetic-profiling-towards-a-general-characterisation-of-embryogenesis
#7
A A Mandawala, S C Harvey, T K Roy, K E Fowler
In vitro fertilisation is an effective method of assisted reproductive technology in both humans and certain non-human animal species. In most species, specifically, in humans and livestock, high in vitro fertilisation success rates are achieved via the transfer of embryos with the highest implantation and subsequent developmental potential. In order to reduce the risk of multiple gestation, which could be a result of the transfer of several embryos per cycle, restrictive transfer policies and methods to improve single embryo selection have been implemented...
September 29, 2016: Animal Reproduction Science
https://www.readbyqxmd.com/read/27680736/the-grass-isn-t-always-greener-the-effects-of-cannabis-on-embryological-development
#8
Joseph Friedrich, Dara Khatib, Keon Parsa, Ariana Santopietro, G Ian Gallicano
With the increasing publicity of marijuana due to recent legislation, it is pertinent that the effects of fetal exposure to the drug are assessed. While in utero cannabis exposure has been associated with early pregnancy failure, birth defects and developmental delay, the mechanisms of such outcomes are largely unexplained. Furthermore, the use of cannabinoids in cancer treatment via growth inhibition and apoptosis may indicate how cannabis exposure likely harms a growing fetus. Cannabinoid signaling is required for proper pre-implantation development, embryo transport to the uterus, and uterine receptivity during implantation...
September 29, 2016: BMC Pharmacology & Toxicology
https://www.readbyqxmd.com/read/27680547/chemosensory-epithelial-cells-in-the-urethra-sentinels-of-the-urinary-tract
#9
Klaus Deckmann, Wolfgang Kummer
A peculiar cell type of the respiratory and gastrointestinal epithelia, originally termed "brush cell" or "tuft cell" by electron microscopists because of its apical tuft of microvilli, utilizes the canonical bitter taste transduction cascade known from oropharyngeal taste buds to detect potential hazardous compounds, e.g. bacterial products. Upon stimulation, this cell initiates protective reflexes and local inflammatory responses through release of acetylcholine and chemokines. Guided by the understanding of these cells as sentinels, they have been newly discovered at previously unrecognized anatomical locations, including the urethra...
September 29, 2016: Histochemistry and Cell Biology
https://www.readbyqxmd.com/read/27660767/fetal-type-variants-of-the-posterior-cerebral-artery-and-concurrent-infarction-in-the-major-arterial-territories-of-the-cerebral-hemisphere
#10
Stephen L Lambert, Frank J Williams, Zhora Z Oganisyan, Lionel A Branch, Edward C Mader
Fetal-type or fetal posterior cerebral artery (FPCA) is a variant of cerebrovascular anatomy in which the distal posterior cerebral artery (PCA) territory is perfused by a branch of the internal carotid artery (ICA). In the presence of FPCA, thromboembolism in the anterior circulation may result in paradoxical PCA territory infarction with or without concomitant infarction in the territories of the middle (MCA) or the anterior (ACA) cerebral artery. We describe 2 cases of FPCA and concurrent acute infarction in the PCA and ICA territories-right PCA and MCA in Patient 1 and left PCA, MCA, and ACA in Patient 2...
July 2016: Journal of Investigative Medicine High Impact Case Reports
https://www.readbyqxmd.com/read/27649924/greater-growth-of-proximal-metatarsals-in-bird-embryos-and-the-evolution-of-hallux-position-in-the-grasping-foot
#11
João Francisco Botelho, Daniel Smith-Paredes, Sergio Soto-Acuña, Daniel Núñez-León, Verónica Palma, Alexander O Vargas
In early theropod dinosaurs-the ancestors of birds-the hallux (digit 1) had an elevated position within the foot and had lost the proximal portion of its metatarsal. It no longer articulated with the ankle, but was attached at about mid-length of metatarsal 2 (mt2). In adult birds, the hallux is articulated closer to the distal end of mt2 at ground level with the other digits. However, on chick embryonic day 7, its position is as in early theropods at half-length of mt2. The adult distal location is acquired during embryonic days 8-10...
September 21, 2016: Journal of Experimental Zoology. Part B, Molecular and Developmental Evolution
https://www.readbyqxmd.com/read/27624796/heterokairy-a-significant-form-of-developmental-plasticity
#12
REVIEW
S D Rundle, J I Spicer
There is a current surge of research interest in the potential role of developmental plasticity in adaptation and evolution. Here we make a case that some of this research effort should explore the adaptive significance of heterokairy, a specific type of plasticity that describes environmentally driven, altered timing of development within a species. This emphasis seems warranted given the pervasive occurrence of heterochrony, altered developmental timing between species, in evolution. We briefly review studies investigating heterochrony within an adaptive context across animal taxa, including examples that explore links between heterokairy and heterochrony...
September 2016: Biology Letters
https://www.readbyqxmd.com/read/27611816/evolutionary-transformation-of-the-palmaris-longus-muscle-in-flying-squirrels-pteromyini-sciuridae-an-anatomical-consideration-of-the-origin-of-the-uniquely-specialized-styliform-cartilage
#13
Tomokazu Kawashima, Richard W Thorington, Paula W Bohaska, Fumi Sato
A long-standing issue in squirrel evolution and development is the origin of the styliform cartilage of flying squirrels, which extends laterally from the carpus to support the gliding membrane (patagium). Because the styliform cartilage is one of the uniquely specialized structures permitting gliding locomotion, the knowledge of its origin and surrounding transformation is key for understanding their aerodynamic evolution. The developmental study that would definitely answer this question would be difficult due to the rarity of embryological material...
September 9, 2016: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
https://www.readbyqxmd.com/read/27587491/development-and-morphology-of-the-ventricular-outflow-tracts
#14
Robert H Anderson, Shumpei Mori, Diane E Spicer, Nigel A Brown, Timothy J Mohun
It is customary, at the current time, to consider many, if not most, of the lesions involving the ventricular outflow tract in terms of conotruncal malformations. This reflects the introduction, in the early 1940s, of the terms conus and truncus to describe the components of the developing outflow tract. The definitive outflow tracts in the postnatal heart, however, possess three, rather than two, components. These are the intrapericardial arterial trunks, the arterial roots, and the subvalvar ventricular outflow tracts...
September 2016: World Journal for Pediatric & Congenital Heart Surgery
https://www.readbyqxmd.com/read/27558767/development-of-the-cardiorespiratory-system-in-dogs-from-days-16-to-46-of-pregnancy
#15
A A Martins, P O Favaron, L de Jesus Oliveira, B T Schäfer, F D Oliveira, M A Miglino
Dogs have been studied for several reasons, such as the genetic improvement, their use as experimental models, in zoonotic research, cell therapy and as a model for human diseases. However, many features relating to the embryonic development of dogs remain unknown because of the absence of embryological studies. Considering the importance of the cardiorespiratory system in the development of embryos, the aim of this study was to investigate the development of the main cardiorespiratory organs of dog embryos and foetuses with estimated gestational ages from 16 to 46 days using macro- and microscopic descriptions...
October 2016: Reproduction in Domestic Animals, Zuchthygiene
https://www.readbyqxmd.com/read/27555815/a-possible-mechanism-of-zika-virus-associated-microcephaly-imperative-role-of-retinoic-acid-response-element-rare-consensus-sequence-repeats-in-the-viral-genome
#16
Ashutosh Kumar, Himanshu N Singh, Vikas Pareek, Khursheed Raza, Subrahamanyam Dantham, Pavan Kumar, Sankat Mochan, Muneeb A Faiq
Owing to the reports of microcephaly as a consistent outcome in the fetuses of pregnant women infected with ZIKV in Brazil, Zika virus (ZIKV)-microcephaly etiomechanistic relationship has recently been implicated. Researchers, however, are still struggling to establish an embryological basis for this interesting causal handcuff. The present study reveals robust evidence in favor of a plausible ZIKV-microcephaly cause-effect liaison. The rationale is based on: (1) sequence homology between ZIKV genome and the response element of an early neural tube developmental marker "retinoic acid" in human DNA and (2) comprehensive similarities between the details of brain defects in ZIKV-microcephaly and retinoic acid embryopathy...
2016: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/27549197/developmental-and-evolutionary-origins-of-the-amniote-phallus
#17
Marissa L Gredler
An intromittent phallus is used for sperm transfer in most amniote taxa; however, there is extensive variation in external genital morphology within and among the major amniote clades. Amniote phalluses vary in number (paired, single, or rudimentary), spermatic canal morphology (closed tube or open sulcus), and mode of transition between resting and tumescent states (inflation, rotation, eversion, or muscle relaxation). In a phylogenetic context, these varying adult anatomies preclude a clear interpretation for the evolutionary history of amniote external genitalia; as such, multiple hypotheses have been presented for the origin(s) of the amniote phallus...
October 2016: Integrative and Comparative Biology
https://www.readbyqxmd.com/read/27504274/unusual-variation-in-the-branching-pattern-of-the-celiac-trunk-and-its-embryological-and-clinical-perspective
#18
Shilpi Agarwal, Babita Pangtey, Neelam Vasudeva
Knowledge of variations in the branching pattern of Celiac Trunk (CT) is important for surgeries of stomach, duodenum, pancreas and hepatobiliary region, for abdominal aortic aneurysm, for liver transplant and chaemoembolization of hepatic tumours. An unusual variation in the branching pattern of CT was observed in 50-year-old male cadaver of Indian origin. CT divided into six branches out of which right & left inferior phrenic arteries originated as first two branches and left gastric artery as the third branch...
June 2016: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/27497839/mollusc-models-i-the-snail-ilyanassa
#19
REVIEW
Morgan Q Goulding, J David Lambert
Ilyanassa obsoleta has been a model system for experimental embryology for over a century. Here we highlight new insight into early cell lineage specification in Ilyanassa. As in all molluscs and other spiralians, stereotyped cleavage patterns establish a homunculus of regional founder cells. Ongoing studies are beginning to dissect mechanisms of asymmetric cell division that specify these cells' fates. This is only part of the story: overlaid on intrinsic cell identities is a graded 'organizer' signal, and emerging evidence suggests wider roles for short-range intercellular signaling...
August 2016: Current Opinion in Genetics & Development
https://www.readbyqxmd.com/read/27497050/ocean-acidification-has-little-effect-on-developmental-thermal-windows-of-echinoderms-from-antarctica-to-the-tropics
#20
Sam E Karelitz, Sven Uthicke, Shawna A Foo, Mike F Barker, Maria Byrne, Danilo Pecorino, Miles D Lamare
As the ocean warms, thermal tolerance of developmental stages may be a key driver of changes in the geographical distributions and abundance of marine invertebrates. Additional stressors such as ocean acidification may influence developmental thermal windows and are therefore important considerations for predicting distributions of species under climate change scenarios. The effects of reduced seawater pH on the thermal windows of fertilisation, embryology and larval morphology were examined using five echinoderm species; two polar (Sterechinus neumayeri and Odontaster validus), two temperate (Fellaster zelandiae and Patiriella regularis) and one tropical (Arachnoides placenta)...
August 6, 2016: Global Change Biology
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