{"id":62770,"date":"2019-09-03T03:45:53","date_gmt":"2019-09-03T03:45:53","guid":{"rendered":""},"modified":"2019-09-03T03:45:53","modified_gmt":"2019-09-03T03:45:53","slug":"percer-le-mystere-de-la-genese","status":"publish","type":"post","link":"https:\/\/harissa.com\/news-wp\/percer-le-mystere-de-la-genese\/","title":{"rendered":"Percer le myst\u00e8re de la gen\u00e8se"},"content":{"rendered":"<p>Quelle est l\u2019origine de la vie&nbsp;? Le Dr Gary Steinman, homme de foi et brillant scientifique, n\u2019a eu de cesse de chercher la r\u00e9ponse \u00e0 cette question<\/p>\n<p>Comment la vie est-elle apparue sur terre&nbsp;? Comment les acides amin\u00e9s et les prot\u00e9ines se sont-ils d\u00e9velopp\u00e9s&nbsp;? Dans sa qu\u00eate insatiable de r\u00e9ponses, le Dr Gary Steinman a men\u00e9 une carri\u00e8re qui illustre cette soif de connaissances&nbsp;: de chimiste-biochimiste il deviendra professeur, puis tour \u00e0 tour astronaute, directeur de d\u00e9veloppement de produits m\u00e9dicaux, m\u00e9decin, auteur, chef de d\u00e9partement universitaire et enfin professeur agr\u00e9g\u00e9. Au lyc\u00e9e, d\u00e9j\u00e0, il se fait remarquer&nbsp;: \u00ab&nbsp;Une ann\u00e9e, j\u2019ai remport\u00e9 le premier prix de l\u2019expo de sciences pour la mise au point d\u2019un traitement contre la polyglobulie, une maladie qui se traduit par une pr\u00e9sence excessive de globules rouges&nbsp;\u00bb, raconte Steinman. \u00ab&nbsp;La deuxi\u00e8me fois, j\u2019ai gagn\u00e9 pour avoir d\u00e9velopp\u00e9 un proc\u00e9d\u00e9 visant \u00e0 am\u00e9liorer le stockage du sang dans les centres de transfusion.&nbsp;\u00bb<\/p>\n<p>La carri\u00e8re de ce chercheur, n\u00e9 \u00e0 D\u00e9troit, n\u2019a pas \u00e9t\u00e9 exactement un long fleuve tranquille, et il lui faudra emprunter plus d\u2019un chemin de traverse pour parvenir \u00e0 ses fins.<\/p>\n<p><strong>Le Chabbat ou la lune<\/strong><\/p>\n<p>Une fois ses troph\u00e9es scientifiques sagement rel\u00e9gu\u00e9s sur une \u00e9tag\u00e8re, Steinman fait route vers l\u2019universit\u00e9 du Michigan o\u00f9 il d\u00e9croche en parall\u00e8le une licence de chimie et une ma\u00eetrise de biochimie. Il accepte ensuite l\u2019invitation de Melvin Calvin, le laur\u00e9at 1961 du prix Nobel de chimie, et int\u00e8gre son laboratoire \u00e0 l\u2019universit\u00e9 de Berkeley, en Californie. Apr\u00e8s avoir obtenu un doctorat en biophysique, il rejoint l\u2019universit\u00e9 de Penn State sur la c\u00f4te est en tant que professeur adjoint au d\u00e9partement de biochimie.<\/p>\n<p>C\u2019est alors qu\u2019une annonce dans un journal scientifique va attirer son attention. Nous sommes en&nbsp;1967&nbsp;; la&nbsp;NASA&nbsp;termine son programme Gemini et est s\u2019appr\u00eate \u00e0 lancer le programme Apollo. Jusque-l\u00e0, seuls les pilotes exp\u00e9riment\u00e9s et les astronautes \u00e9taient habilit\u00e9s \u00e0 prendre part aux missions de la&nbsp;NASA. Gary Steinman se pr\u00e9sente avec, en poche, sa curiosit\u00e9 pour percer le myst\u00e8re de la gen\u00e8se. \u00ab&nbsp;Je voulais \u00eatre \u00e0 l\u2019avant-garde de la recherche sur les origines de la vie. Participer \u00e0 ce programme allait m\u2019aider \u00e0 poursuivre ma qu\u00eate&nbsp;\u00bb, explique-t-il.<\/p>\n<p>Apr\u00e8s avoir subi toute une batterie de tests physiques et psychologiques au Centre a\u00e9rospatial de San Antonio, au Texas, notre scientifique re\u00e7oit la note suivante&nbsp;: \u00ab&nbsp;L\u2019Ecole de m\u00e9decine a\u00e9rospatiale recommande la candidature du Dr Steinman, d\u00e9clar\u00e9 apte \u00e0 remplir la mission de l\u2019\u00e9quipage spatial.&nbsp;\u00bb \u00ab&nbsp;Je faisais partie du premier groupe de scientifiques recrut\u00e9 par la&nbsp;NASA. Mon r\u00f4le&nbsp;: explorer les conditions pr\u00e9biotiques sur la lune et d\u2019autres plan\u00e8tes.&nbsp;\u00bb Notre astronaute juif est sur le point de prendre son envol. \u00ab&nbsp;C\u2019est toujours aussi palpitant de me rem\u00e9morer cette aventure&nbsp;\u00bb, raconte Steinman, au souvenir de ces \u00e9v\u00e9nements qui remontent \u00e0 pr\u00e8s de 50 ans. L\u2019excitation sera pourtant de courte dur\u00e9e.<\/p>\n<p>Juif pratiquant et respectueux du Chabbat, Steinman se rend aupr\u00e8s d\u2019Alan Shepard, l\u2019un des sept premiers astronautes de la&nbsp;NASA&nbsp;\u00e0 avoir, en mai&nbsp;1961, effectu\u00e9 le premier vol habit\u00e9 sur Mercury. Il lui demande&nbsp;: \u00ab&nbsp;Que se passera-t-il si le lancement a lieu un samedi&nbsp;?&nbsp;\u00bb La r\u00e9ponse de Shepard n\u2019est pas exactement ce qu\u2019il avait esp\u00e9r\u00e9. \u00ab&nbsp;On ne peut rien y faire&nbsp;\u00bb, lui explique-t-il. \u00ab&nbsp;Impossible d\u2019y changer quoi que ce soit.&nbsp;\u00bb<\/p>\n<p>La d\u00e9cision est loin d\u2019\u00eatre facile, mais Steinman d\u00e9cide alors d\u2019abandonner le programme. Comme \u00e0 de nombreux carrefours de sa vie, il reste tr\u00e8s philosophe sur cette occasion manqu\u00e9e&nbsp;: \u00ab&nbsp;J\u2019\u00e9tais bien s\u00fbr extr\u00eamement d\u00e9\u00e7u, mais il faut savoir faire des choix dans la vie.&nbsp;\u00bb<\/p>\n<p><strong>De la&nbsp;NASA&nbsp;\u00e0 la m\u00e9decine<\/strong><\/p>\n<p>Six mois apr\u00e8s avoir mis fin \u00e0 sa carri\u00e8re d\u2019astronaute, le scientifique re\u00e7oit un appel en provenance d\u2019Isra\u00ebl&nbsp;: on lui propose le poste de directeur g\u00e9n\u00e9ral d\u2019Ames-Yissum, une entreprise de recherche et d\u00e9veloppement affili\u00e9e \u00e0 l\u2019Universit\u00e9 h\u00e9bra\u00efque afin de superviser la production de mat\u00e9riel de diagnostic m\u00e9dical. Au bout de quatre ans et 7&nbsp;millions de dollars de produits export\u00e9s, le pr\u00e9sident Zalman Shazar lui d\u00e9cerne la m\u00e9daille d\u2019\u00ab&nbsp;exportateur distingu\u00e9&nbsp;\u00bb.<\/p>\n<p>Mais malgr\u00e9 son succ\u00e8s en Isra\u00ebl, Steinman a toujours \u00e9t\u00e9 attir\u00e9 par la m\u00e9decine. Il entend alors parler d\u2019un programme unique propos\u00e9 par l\u2019universit\u00e9 de Miami, qui offre aux titulaires d\u2019un doctorat d\u2019obtenir un dipl\u00f4me de m\u00e9decine en 18 mois, au lieu de quatre ans. Au nombre des 20 candidats re\u00e7us sur 1&nbsp;100 inscrits, Steinman termine son dipl\u00f4me en Floride et compl\u00e8te son internat \u00e0 l\u2019Albert Einstein College of Medicine de New York. \u00ab&nbsp;J\u2019ai une passion pour la m\u00e9decine, la chirurgie et la psychologie&nbsp;\u00bb, explique-t-il pour justifier son choix de devenir gyn\u00e9cologue obst\u00e9tricien. Il ajoute que les accouchements lui procurent une immense satisfaction. Il sait de quoi il parle, puisqu\u2019il a mis au monde quatre de ses sept enfants (et circoncis lui-m\u00eame ses deux fils). C\u2019est aussi lui qui, en 1997, a mis au monde les seuls quadruplets identiques n\u00e9s sans l\u2019aide de traitements de fertilit\u00e9.<\/p>\n<p><strong>Des recherches d\u00e9terminantes<\/strong><\/p>\n<p>Apr\u00e8s avoir enseign\u00e9 \u00e0 la facult\u00e9 de m\u00e9decine de Touro College \u00e0 New York, Steinman d\u00e9cide de revenir en Isra\u00ebl. Il int\u00e8gre l\u2019\u00e9quipe de gyn\u00e9co-obst\u00e9trique du centre hospitalo-universitaire Hadassah. Le chercheur qu\u2019il est s\u2019int\u00e9resse tout particuli\u00e8rement aux jumeaux et aux autistes. \u00ab&nbsp;Il existe une ville au Br\u00e9sil qui poss\u00e8de un taux \u00e9lev\u00e9 de naissances g\u00e9mellaires. Le bruit courait que l\u2019inf\u00e2me Josef Mengele avait pratiqu\u00e9 des exp\u00e9riences sur les femmes lorsqu\u2019il se trouvait l\u00e0-bas afin de provoquer la naissance de jumeaux&nbsp;\u00bb, relate Steinman, avant de balayer la rumeur&nbsp;: \u00ab&nbsp;En r\u00e9alit\u00e9, ce ph\u00e9nom\u00e8ne est \u00e0 relier \u00e0 la consanguinit\u00e9 au sein de la population&nbsp;: le g\u00e8ne des jumeaux se transmet parmi les membres de la famille.&nbsp;\u00bb<\/p>\n<p>Les recherches du scientifique sur les jumeaux l\u2019ont conduit \u00e0 \u00e9tablir une connexion entre le facteur de croissance de type insuline, ou&nbsp;IGF, et l\u2019autisme, qui affecte un enfant sur 68 selon le Centre de contr\u00f4le et de pr\u00e9vention des maladies. La fonction de l\u2019IGF est de stimuler la my\u00e9line, une gaine qui se forme autour des cellules nerveuses et qui acc\u00e9l\u00e8re l\u2019influx nerveux. Sans cette gaine, les nerfs sont mal raccord\u00e9s. \u00ab&nbsp;On trouve un taux d\u2019IGF plus \u00e9lev\u00e9 chez les m\u00e8res de jumeaux&nbsp;\u00bb, explique Steinman, \u00ab&nbsp;tandis que les enfants qui naissent autistes souffrent au contraire d\u2019un d\u00e9ficit en&nbsp;IGF&nbsp;au stade f\u0153tal. Les enfants autistes \u00e2g\u00e9s d\u2019un \u00e0 quatre ans montrent \u00e9galement des taux d\u2019IGF inf\u00e9rieurs. A l\u2019heure actuelle, le seul espoir de r\u00e9parer les nerfs endommag\u00e9s passe par la recherche sur les cellules-souches.\u00bb\u2026<\/p>\n<p>La suite sur Jerusalem Post Edition Fran\u00e7aise<\/p>\n<p><strong>Source:<\/strong>&nbsp;<a href=\"http:\/\/www.jpost.com\/Edition-Francaise\/Art-Et-Culture\/Percer-le-myst%C3%A8re-de-la-gen%C3%A8se-475055\">jpost.com<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Quelle est l\u2019origine de la vie&nbsp;? Le Dr Gary Steinman, homme de foi et brillant scientifique, n\u2019a eu de cesse de chercher la r\u00e9ponse \u00e0 cette question Comment la vie est-elle apparue sur terre&nbsp;? Comment les acides amin\u00e9s et les prot\u00e9ines se sont-ils d\u00e9velopp\u00e9s&nbsp;? Dans sa qu\u00eate insatiable de r\u00e9ponses, le Dr Gary Steinman a&hellip;&nbsp;<\/p>\n","protected":false},"author":1,"featured_media":62771,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"","neve_meta_content_width":0,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":"","footnotes":""},"categories":[],"tags":[],"class_list":["post-62770","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Percer le myst\u00e8re de la gen\u00e8se | HARISSA.COM<\/title>\n<meta name=\"description\" content=\"Quelle est l\u2019origine de la vie&nbsp;? 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