Molecular Embryology
Mostrando 1-11 de 11 artigos, teses e dissertações.
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1. Embryology of Ageratum conyzoides L. and A. fastigiatum R.M. King & H. Rob. (Asteraceae)
Ageratum has a complex circumscription, and recent studies have indicated its polyphyletism. The genus has been placed in the tribe Eupatorieae whose embryology is not fully known. Embryological data are conservative and important indicators of phylogenetic relationships and can improve family relationships. This study presents, for the first time in Eupato
Acta Bot. Bras.. Publicado em: 2015-03
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2. Molecular regulation of atrial-specific expression of the SMyHC3 gene. / Regulação molecular da expressão atrial - específica do gene SMyHC3.
Para elucidar as vias genéticas controlando a formação das câmaras cardíacas, foi analisada a regulação do promotor atrial-específico do gene de codorna que codifica a isoforma lenta da cadeia pesada de miosina (slow myosin heavy chain 3 -SMyHC3). Em camundongos transgênicos, a expressão atrial-específica dos 840 pb do promotor SMyHC3 fundido ao g
Publicado em: 2010
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3. Mecanismos embrionários de diferenciação de precursores coronários: princípios para aplicação em terapia celular. / Embryonic mechanisms of coronary precursor differentiation: principles for cell therapy.
Coronary vessels derive from the proepicardium (PE), a structure formed by precursor of coronary vessels cells, endothelial and smooth muscle cells (CoSMC). In vivo there is a clear gap between the endothelial differentiation and the integration of CoSMC into the vascular tubes. The aim of this work was to understand the mechanisms controlling the delayed in
Publicado em: 2009
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4. Cloning and expression analysis of the transcription factor Scratch2 during the chicken early embryogenesis. / Clonagem e análise da expressão do fator de transcrição Scratch2 durante a embriogênese inicial de galinha.
In invertebrates, the Scratch (Scrt) genes encode transcription factors that promote neurogenesis during development. The Scrt function in vertebrates is unknown, but in mice Scrt1 and Scrt2 are specifically expressed in post-mitotic neurons in the embryo and in the adult central nervous system. In this work, we have cloned the coding sequence of chicken Scr
Publicado em: 2009
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5. Search for regulatory elements in the ALDH1A2 (RALDH2) gene during development: a philogenetic approach. / Controle da expressão do gene ALDH1A2 (RALDH2) durante o desenvolvimento: uma abordagem filogenética.
O ácido retinóico (AR) é essencial para a embriogênese. A principal enzima sintetizadora de AR durante o desenvolvimento é a ALDH1A2 (RALDH2), uma retinaldeído desidrogenase que converte retinaldeído a AR. Para entendermos como o gene da aldh1a2 é regulado identificamos regiões evolutivamente conservadas (ECRs) em vertebrados e testamos seu potencia
Publicado em: 2008
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6. The developing renal, reproductive, and respiratory systems of the African elephant suggest an aquatic ancestry
The early embryology of the elephant has never been studied before. We have obtained a rare series of African elephant (Loxodonta africana) embryos and fetuses ranging in weight from 0.04 to 18.5 g, estimated gestational ages 58–166 days (duration of gestation is ≈660 days). Nephrostomes, a feature of aquatic vertebrates, were found in the mesonephric ki
The National Academy of Sciences.
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7. Embryology of the lamprey and evolution of the vertebrate jaw: insights from molecular and developmental perspectives.
Evolution of the vertebrate jaw has been reviewed and discussed based on the developmental pattern of the Japanese marine lamprey, Lampetra japonica. Though it never forms a jointed jaw apparatus, the L. japonica embryo exhibits the typical embryonic structure as well as the conserved regulatory gene expression patterns of vertebrates. The lamprey therefore
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8. Ontophyletics of the nervous system: eyeless mutants illustrate how ontogenetic buffer mechanisms channel evolution.
Genetics and molecular biology have shown the mechanisms that allow the genome to provide both the continuity and the variation from generation to generation within a phylogeny. Embryology and developmental biology show the mechanisms that turn the genome into an organism. Mutations, the basis for evolutionary change, cannot in themselves ensure concordance
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9. Primary ciliary dyskinesia: a report from ATS 2001, May 18–23, San Francisco
Primary ciliary dyskinesia (PCD) is a genetic disorder of abnormal ciliary structure and function that leads to defective mucociliary clearance, resulting in oto-sino-pulmonary disease, and infertility. The disease is currently under intense investigation by a number of research groups worldwide. At the recent American Thoracic Society meeting in San Francis
BioMed Central.
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10. A new scenario for the evolutionary origin of hair, feather, and avian scales
In zoology it is well known that birds are characterized by the presence of feathers, and mammals by hairs. Another common point of view is that avian scales are directly related to reptilian scales. As a skin embryologist, I have been fascinated by the problem of regionalization of skin appendages in amniotes throughout my scientific life. Here I have colle
Blackwell Science Inc.
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11. Neural Induction in Xenopus: Requirement for Ectodermal and Endomesodermal Signals via Chordin, Noggin, β-Catenin, and Cerberus
The origin of the signals that induce the differentiation of the central nervous system (CNS) is a long-standing question in vertebrate embryology. Here we show that Xenopus neural induction starts earlier than previously thought, at the blastula stage, and requires the combined activity of two distinct signaling centers. One is the well-known Nieuwkoop cent
Public Library of Science.