Faut-il ressusciter les espèces disparues ? by Kevin Llopart https://padlet.com/kevinllopart/czmfp5ivaquuhho9 en-us 2021-05-04 21:45:16 UTC 2021-05-04 22:02:12 UTC hello@padlet.com Des scientifiques veulent ressusciter des animaux disparus kevinllopart https://padlet.com/kevinllopart/czmfp5ivaquuhho9/wish/1491831955 Regarder jusqu'à 50 secondes pour lancer le débat.]]> 2021-05-04 21:47:37 UTC https://padlet.com/kevinllopart/czmfp5ivaquuhho9/wish/1491831955 Premier clonage d'un animal disparu kevinllopart https://padlet.com/kevinllopart/czmfp5ivaquuhho9/wish/1491834980 Un bouquetin des Pyrénées, dont le dernier individu a disparu en 2000, est né par clonage en Espagne. L'animal n'a pas survécu mais cette deuxième tentative laisse espérer des succès à venir. Les perspectives sont immenses.
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Après cinq mois de grossesse, un des embryons est arrivé à terme et a été délivré par césarienne. Morphologiquement identique à l'animal disparu, il n'a malheureusement survécu que quelques minutes à l'air libre, en raison d'une malformation pulmonaire. Cependant, l'examen de son ADN a confirmé la parfaite similitude entre le clone et Capra pyrenaica ssp. pyrenaica.

source: https://www.futura-sciences.com/sante/actualites/genetique-premier-clonage-presque-reussi-animal-disparu-18298/]]> 2021-05-04 21:49:07 UTC https://padlet.com/kevinllopart/czmfp5ivaquuhho9/wish/1491834980 Scientists produce cloned embryos of extinct frog - 15 mars 2013 kevinllopart https://padlet.com/kevinllopart/czmfp5ivaquuhho9/wish/1491845178 The bizarre gastric-brooding frog, Rheobatrachus silus – which uniquely swallowed its eggs,  brooded its young in its stomach and gave birth through its mouth – became extinct in 1983.
But the Lazarus Project team has been able to recover cell nuclei from tissues collected in the 1970s and kept for 40 years in a conventional deep freezer. The “de-extinction” project aims to bring the frog back to life.
In repeated experiments over five years, the researchers used a laboratory technique known as somatic cell nuclear transfer. They took fresh donor eggs from the distantly related Great Barred Frog, Mixophyes fasciolatus, inactivated the egg nuclei and replaced them with dead nuclei from the extinct frog. Some of the eggs spontaneously began to divide and grow to early embryo stage – a tiny ball of many living cells.
Although none of the embryos survived beyond a few days, genetic tests confirmed that the dividing cells contain the genetic material from the extinct frog.

source: https://newsroom.unsw.edu.au/news/science/scientists-produce-cloned-embryos-extinct-frog
]]> 2021-05-04 21:54:09 UTC https://padlet.com/kevinllopart/czmfp5ivaquuhho9/wish/1491845178 The Tauros programme kevinllopart https://padlet.com/kevinllopart/czmfp5ivaquuhho9/wish/1491849019 The search for a new icon for European wilderness
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The Aurochs may be gone, luckily, the descendants of the Aurochs survived and in the millions, but as domesticated cattle. Among them - in remote corners of Europe - some 'primitive' breeds: breeds with a lot of the characteristics of the former Aurochs. The Tauros programme identified the most promising ones for a breeding programme. The breeding is done on a broad scientific foundation with a multidisciplinary team. 

source: http://www.taurosproject.com/]]> 2021-05-04 21:56:03 UTC https://padlet.com/kevinllopart/czmfp5ivaquuhho9/wish/1491849019 Ressources supplémentaires pour lecteurs experts kevinllopart https://padlet.com/kevinllopart/czmfp5ivaquuhho9/wish/1491858746 2021-05-04 22:01:14 UTC https://padlet.com/kevinllopart/czmfp5ivaquuhho9/wish/1491858746