Edward M. De Robertis | |
---|---|
Born | |
Alma mater | |
Known for | Dorsal-Ventral patterning, Evo-Devo, Xenopus |
Scientific career | |
Fields | embryology |
Institutions | |
Doctoral advisor | John Gurdon |
Website | https://www.hhmi.ucla.edu/derobertis/ |
Edward Michael De Robertis (born June 6, 1947) is an American embryologist and Professor at the University of California, Los Angeles. [1] [2] His work has contributed to the finding of conserved molecular processes of embryonic inductions that result in tissue differentiations during animal development. [3] He was elected to the National Academy of Sciences in 2013, worked for the Howard Hughes Medical Institute for 26 years, and holds a Distinguished Professor at the University of California, Los Angeles. [4] [5] In 2009 Pope Benedict XVI appointed De Robertis to a lifetime position in the Pontifical Academy of Sciences, and in 2022 Pope Francis appointed him Councillor of the Academy for four years. [6] [7]
Edward De Robertis was born on June 6, 1947, in Cambridge, Massachusetts, while his father, neurobiologist Eduardo Diego De Robertis, was an MIT postdoctoral fellow. From the age of three, he was reared in Uruguay, where he received his medical degree at age 24 from the Universidad de la República del Uruguay. This was followed by the completion of a Ph.D. in chemistry at the Leloir Institute in Buenos Aires, Argentina. [8] [9]
De Robertis' postdoctoral training (1974-1977) was with Nobel laureate Sir John Gurdon at the Medical Research Council in Cambridge England.
In 1984, De Robertis together with his late colleague Walter Gehring's and their laboratories cloned the first vertebrate development-controlling gene, today known as Hox-C6. [10] [11] [12] [13] [14] [15] Hox genes are responsible for anterior-to-posterior (head-to-tail) differentiation. The finding that Hox genes are conserved in both vertebrates and fruit flies heralded the beginning of the nascent scientific field of Evolution and Development, or Evo-Devo. [16] [17] [18]
In the 1990s, the laboratory of De Robertis dissected systematically the molecular pathways that mediate embryonic induction. [19] [20] Hans Spemann and Hilde Mangold discovered in 1924 an area of the amphibian embryo that, when transplanted, might promote the creation of Siamese twins. [21] De Robertis identified the genes expressed in Xenopus embryos in this area, beginning with the goosecoid homeobox gene. [22] [23]
Together with his colleagues, he discovered Chordin, a protein secreted by dorsal cells that binds Bone Morphogenetic Protein (BMP) growth factors, facilitating their transport to the ventral side of the embryo, where Chordin is digested by a protease called Tolloid, allowing BMPs to signal once more. [24] [25] [26] [27] In most bilateral species, such as fruit flies, spiders, early chordates, and mammals, this flow of growth factors dictates dorsal (back) to ventral (belly) cell and tissue differentiation. The Chordin/BMP/Tolloid biochemical pathway is cross-regulated by interactions with other signalling pathways such as Wnt. [28] His lab has recently established a link between the canonical Wnt pathway, macropinocytosis, multivesicular endosomes, lysosomes, and protein degradation. [29] [30] [31]
He has also served for over two decades on the scientific board of the Pew Charitable Trusts Latin American Fellows programme.[ citation needed ]
A homeobox is a DNA sequence, around 180 base pairs long, that regulates large-scale anatomical features in the early stages of embryonic development. For instance, mutations in a homeobox may change large-scale anatomical features of the full-grown organism.
Gastrulation is the stage in the early embryonic development of most animals, during which the blastula, or in mammals the blastocyst is reorganized into a multilayered structure known as the gastrula. Before gastrulation, the embryo is a continuous epithelial sheet of cells; by the end of gastrulation, the embryo has begun differentiation to establish distinct cell lineages, set up the basic axes of the body, and internalized one or more cell types including the prospective gut.
Robert G. Roeder is an American biochemist. He is known as a pioneer scientist in eukaryotic transcription. He discovered three distinct nuclear RNA polymerases in 1969 and characterized many proteins involved in the regulation of transcription, including basic transcription factors and the first mammalian gene-specific activator over five decades of research. He is the recipient of the Gairdner Foundation International Award in 2000, the Albert Lasker Award for Basic Medical Research in 2003, and the Kyoto Prize in 2021. He currently serves as Arnold and Mabel Beckman Professor and Head of the Laboratory of Biochemical and Molecular Biology at The Rockefeller University.
Chordin is a protein with a prominent role in dorsal–ventral patterning during early embryonic development. In humans it is encoded for by the CHRD gene.
Douglas A. Melton is the Xander University Professor at Harvard University, and an investigator at the Howard Hughes Medical Institute. Additionally, Melton serves as the co-director of the Harvard Stem Cell Institute and was the first co-chair of the Harvard University Department of Stem Cell and Regenerative Biology. Melton is a founder of several biotech companies including Gilead Sciences, Ontogeny, iPierian, and Semma Therapeutics. Melton holds membership in the National Academy of the Sciences, the American Academy of Arts and Sciences, and is a founding member of the International Society for Stem Cell Research.
Cerberus is a protein that in humans is encoded by the CER1 gene. Cerberus is a signaling molecule which contributes to the formation of the head, heart and left-right asymmetry of internal organs. This gene varies slightly from species to species but its overall functions seem to be similar.
Pre-B-cell leukemia transcription factor 1 is a protein that in humans is encoded by the PBX1 gene.
Homeobox protein Hox-B5 is a protein that in humans is encoded by the HOXB5 gene.
Homeobox protein Hox-C13 is a protein that in humans is encoded by the HOXC13 gene.
Homeobox protein goosecoid(GSC) is a homeobox protein that is encoded in humans by the GSC gene. Like other homeobox proteins, goosecoid functions as a transcription factor involved in morphogenesis. In Xenopus, GSC is thought to play a crucial role in the phenomenon of the Spemann-Mangold organizer. Through lineage tracing and timelapse microscopy, the effects of GSC on neighboring cell fates could be observed. In an experiment that injected cells with GSC and observed the effects of uninjected cells, GSC recruited neighboring uninjected cells in the dorsal blastopore lip of the Xenopus gastrula to form a twinned dorsal axis, suggesting that the goosecoid protein plays a role in the regulation and migration of cells during gastrulation.
Homeobox protein Hox-A2 is a protein that in humans is encoded by the HOXA2 gene.
Yoshiki Sasai was a Japanese stem cell biologist. He developed methods to guide human embryonic stem cells (hESCs) into forming brain cortex, eyes, and other organs in tissue culture. Sasai worked at the Riken Center for Developmental Biology (CDB) in Kobe, and was Director of the Laboratory for Organogenesis and Neurogenesis. Following his involvement in the 2014 STAP cell controversy, Sasai was found dead at Riken from an apparent suicide.
Athanasia Papalopulu is a Wellcome Trust senior research fellow and Professor of Developmental Neuroscience in the School of Biological Sciences, University of Manchester.
Clifford James Tabin is chairman of the Department of Genetics at Harvard Medical School.
Richard Paul Harvey is a molecular biologist, the Sir Peter Finley professor of Heart Research at the University of New South Wales and Deputy Director and Head of the Developmental and Stem Cell Biology Division at the Victor Chang Cardiac Research Institute.
The Spemann-Mangold organizer is a group of cells that are responsible for the induction of the neural tissues during development in amphibian embryos. First described in 1924 by Hans Spemann and Hilde Mangold, the introduction of the organizer provided evidence that the fate of cells can be influenced by factors from other cell populations. This discovery significantly impacted the world of developmental biology and fundamentally changed the understanding of early development.
Richard M. Harland is CH Li Distinguished Professor of Genetics, Genomics and Development at the University of California, Berkeley.
Bruno Reversade is an American human geneticist and developmental biologist. He is a Director of the Institute of Molecular and Cellular Biology and the Genome Institute of Singapore at A*STAR (Singapore) and holds several faculty positions at other universities. Reversade is known for identifying mutated genes that cause Mendelian diseases, for his research on the genetics of identical twins and for the characterizations of novel hormones.
The dorsal lip of the blastopore is a structure that forms during early embryonic development and is important for its role in organizing the germ layers. The dorsal lip is formed during early gastrulation as folding of tissue along the involuting marginal zone of the blastocoel forms an opening known as the blastopore. It is particularly important for its role in neural induction through the default model, where signaling from the dorsal lip protects a region of the epiblast from becoming epidermis, thus allowing it to develop to its default neural tissue.
A developmental signaling center is defined as a group of cells that release various morphogens which can determine the fates, or destined cell types, of adjacent cells. This process in turn determines what tissues the adjacent cells will form. Throughout the years, various development signaling centers have been discovered.
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