{"id":10000,"date":"2023-11-08T20:25:46","date_gmt":"2023-11-08T20:25:46","guid":{"rendered":"https:\/\/www.africa-press.net\/sao-tome-e-principe\/politique\/ou-se-situe-la-tete-dune-etoile-de-mer-partout-sur-son-corps"},"modified":"2023-11-08T21:38:37","modified_gmt":"2023-11-08T21:38:37","slug":"ou-se-situe-la-tete-dune-etoile-de-mer-partout-sur-son-corps","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/sao-tome-e-principe\/toutes-les-actualites\/ou-se-situe-la-tete-dune-etoile-de-mer-partout-sur-son-corps","title":{"rendered":"O\u00f9 se situe la t\u00eate d\u2019une \u00e9toile de mer ? Partout sur son corps !"},"content":{"rendered":"

Africa-Press – S\u00e3o Tom\u00e9 e Pr\u00edncipe. <\/strong><\/span>A priori, difficile de rapprocher l\u2019anatomie de l\u2019e\u0301toile de mer, a\u0300 celle de l\u2019e\u0302tre humain. Et pourtant, c\u2019est le de\u0301fi qu\u2019ont releve\u0301 des chercheurs de l\u2019universite\u0301 Stanford (Etats-Unis), avec un objectif bien pre\u0301cis : comprendre le de\u0301veloppement singulier de cet e\u0301chinoderme. Gra\u0302ce a\u0300 des outils ge\u0301ne\u0301tiques et des techniques de biologie mole\u0301culaire, ils sont parvenus a\u0300 e\u0301tablir son plan corporel. Leurs re\u0301sultats, publie\u0301s dans la prestigieuse revue Nature, indiquent que l\u2019e\u0301toile de mer serait pourvue de plusieurs te\u0302tes.<\/p>\n

Changement de syme\u0301trie<\/b><\/p>\n

Un des grands myste\u0300res de cet e\u0301chinoderme re\u0301side dans son de\u0301veloppement larvaire. Une fois l\u2019\u0153uf e\u0301clos, la larve de l\u2019e\u0301toile de mer flotte librement pendant plusieurs semaines, voire plusieurs mois. Les petits cils dont elle est pourvue en surface, lui permettent de nager et de se nourrir. Cette larve est a\u0300 syme\u0301trie bilate\u0301rale : comme l\u2019e\u0302tre humain, elle posse\u0300de deux moitie\u0301s identiques et donc une droite et une gauche. Mais une fois au fond de l\u2019oce\u0301an, elle se me\u0301tamorphose et change de syme\u0301trie. Elle adopte alors une syme\u0301trie radiale, a\u0300 partir d\u2019un point central, caracte\u0301ristique de certains e\u0301chinodermes dont les oursins et les e\u0301toiles de mer. \u201cC\u2019est un myste\u0300re zoologique depuis des sie\u0300cles !\u201d, signale Christopher Lowe, co-auteur de l\u2019e\u0301tude. \u201cComment peut-on passer d\u2019un plan corporel bilate\u0301ral a\u0300 un plan pentaradial, et comment comparer n\u2019importe quelle partie de l\u2019e\u0301toile de mer a\u0300 notre propre plan corporel ?\u201d<\/p>\n

Afin de re\u0301pondre a\u0300 ces questions, essentielles pour comprendre l\u2019e\u0301volution de la famille des e\u0301chinodermes, les chercheurs ont analyse\u0301 l\u2019expression ge\u0301ne\u0301tique au sein des tissus des e\u0301toiles de mer. En effet, les ge\u0300nes codant pour la formation de la te\u0302te, et diffe\u0301rentes re\u0301gions du corps, sont les me\u0302mes chez tous les animaux. Restait a\u0300 observer le lieu de leur expression, gra\u0302ce a\u0300 la tomographie, pour e\u0301tablir une carte des re\u0301gions du corps de l\u2019e\u0301toile de mer.<\/p>\n

Des te\u0302tes dans les \u201cbras\u201d<\/b><\/p>\n

Si nous sommes habitue\u0301s a\u0300 parler des \u201cbras\u201d de l\u2019e\u0301toile de mer, ce n\u2019est pas tout a\u0300 fait exact. D\u2019apre\u0300s les re\u0301sultats de cette dernie\u0300re e\u0301tude, au centre de chacun des membres se situerait une te\u0302te. Pour aboutir a\u0300 cette conclusion, les chercheurs ont e\u0301tudie\u0301 les branches de l\u2019e\u0301toile de mer, section par section. \u201cElles peuvent re\u0301ge\u0301ne\u0301rer les membres coupe\u0301s\u201d, note Laurent Formery, premier auteur de l\u2019e\u0301tude. Pour chaque \u201ctranche\u201d, l\u2019e\u0301quipe a utilise\u0301 des marqueurs mole\u0301culaires, les ge\u0300nes Hox par exemple, afin d\u2019identifier l\u2019organisation du corps de l\u2019e\u0301chinoderme. \u201cCes ge\u0300nes agissent comme des mode\u0300les pour le plan corporel d\u2019un organisme en \u00ab indiquant \u00bb a\u0300 chaque cellule a\u0300 quelle re\u0301gion du corps elle appartient\u201d, re\u0301sument les chercheurs.<\/p>\n

Dans un premier temps, il a fallu identifier quels ge\u0300nes e\u0301taient exprime\u0301s dans chacune des sections. A partir de ce re\u0301sultat, l\u2019e\u0301quipe de Laurent Formery a constitue\u0301 une carte de l\u2019expression des ge\u0300nes en trois dimensions. Ensuite, les biologistes ont colore\u0301 les e\u0301chantillons pour de\u0301terminer ou\u0300 les ge\u0300nes e\u0301taient exprime\u0301s au sein de chaque tranche. Une technique connue sous le nom d\u2019hybridation in situ. Conclusion : l\u2019e\u0301toile de mer est un amas de te\u0302tes. Une au sein de chaque branche, et une dernie\u0300re au centre. \u201cE\u0301tonnamment, aucune partie de l\u2019ectoderme, tissu externe que nous avons e\u0301tudie\u0301 dans cette e\u0301tude, n\u2019exprime pas ge\u0301ne\u0301tiquement de quoi former un \u201ctronc\u201d, ce qui sugge\u0300re que les e\u0301toiles de mer ressemblent principalement a\u0300 des te\u0302tes\u201d, affirment les chercheurs.<\/p>\n

Le paralle\u0300le entre la disposition corporelle (et les me\u0301canismes mole\u0301culaires qui l\u2019induisent), chez l\u2019e\u0301toile de mer et chez l\u2019Homme, e\u0301claire la position des e\u0301chinodermes dans l\u2019arbre phyloge\u0301ne\u0301tique. Il permet d\u2019expliquer leur apparence et de comprendre leur de\u0301veloppement. \u201cDe multiples interrogations persistent au sujet des e\u0301chinodermes car nous ne connaissons pas grand-chose a\u0300 leur sujet. Toutefois, cette analyse mole\u0301culaire repre\u0301sente une nouvelle pie\u0300ce du puzzle,\u201d concluent-ils.<\/p>\n

Pour plus d’informations et d’analyses sur la S\u00e3o Tom\u00e9 e Pr\u00edncipe<\/a>, suivez Africa-Press<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"

Africa-Press – S\u00e3o Tom\u00e9 e Pr\u00edncipe. A priori, difficile de rapprocher l\u2019anatomie de l\u2019e\u0301toile de mer, a\u0300 celle de l\u2019e\u0302tre humain. Et pourtant, c\u2019est le de\u0301fi qu\u2019ont releve\u0301 des chercheurs de l\u2019universite\u0301 Stanford (Etats-Unis), avec un objectif bien pre\u0301cis : comprendre le de\u0301veloppement singulier de cet e\u0301chinoderme. Gra\u0302ce a\u0300 des outils ge\u0301ne\u0301tiques et des techniques […]<\/p>\n","protected":false},"author":82,"featured_media":9999,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[36,55,56],"class_list":["post-10000","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-africa-press","tag-africa-press-sao-tome-e-principe","tag-sao-tome-e-principe"],"yoast_head":"\nO\u00f9 se situe la t\u00eate d\u2019une \u00e9toile de mer ? Partout sur son corps ! - S\u00e3o Tom\u00e9 e Pr\u00edncipe<\/title>\n<meta name=\"description\" content=\"A priori, difficile de rapprocher l\u2019anatomie de l\u2019e\u0301toile de mer, a\u0300 celle de l\u2019e\u0302tre humain. 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