Two experiments have been performed to clone the bucardo, an extinct wild goat. The karyoplasts were thawed fibroblasts
derived from skin biopsies, obtained and cryopreserved in 1999 from the last living specimen, a female, which died in 2000.
Cytoplasts were mature oocytes collected from the oviducts of superovulated domestic goats. Oocytes were enucleated and coupled
to bucardo’s fibroblasts by electrofusion. Reconstructed embryos were cultured for 36 h or 7 d and transferred to either Spanish ibex
or hybrid (Spanish ibex male domestic goat) synchronized recipients. Embryos were placed, according to their developmental
stage, into the oviduct or into the uterine horn ipsilateral to an ovulated ovary. Pregnancy was monitored through their plasmatic
PAG levels. In Experiment 1, 285 embryos were reconstructed and 30 of them were transferred at the 3- to 6-cells stage to 5
recipients. The remaining embryos were further cultured to day 7, and 24 of them transferred at compact morula/blastocyst stage to
8 recipients. In Experiment 2, 154 reconstructed embryos were transferred to 44 recipients at the 3- to 6-cells stage. Pregnancies
were attained in 0/8 and 7/49 of the uterine and oviduct-transferred recipients, respectively. One recipient maintained pregnancy to
term, displaying very high PAG levels. One morphologically normal bucardo female was obtained by caesarean section. The
newborn died some minutes after birth due to physical defects in lungs. Nuclear DNA confirmed that the clone was genetically
identical to the bucardo’s donor cells. To our knowledge, this is the first animal born from an extinct subspecies.
Two experiments have been performed to clone the bucardo, an extinct wild goat. The karyoplasts were thawed fibroblastsderived from skin biopsies, obtained and cryopreserved in 1999 from the last living specimen, a female, which died in 2000.Cytoplasts were mature oocytes collected from the oviducts of superovulated domestic goats. Oocytes were enucleated and coupledto bucardo’s fibroblasts by electrofusion. Reconstructed embryos were cultured for 36 h or 7 d and transferred to either Spanish ibexor hybrid (Spanish ibex male domestic goat) synchronized recipients. Embryos were placed, according to their developmentalstage, into the oviduct or into the uterine horn ipsilateral to an ovulated ovary. Pregnancy was monitored through their plasmaticPAG levels. In Experiment 1, 285 embryos were reconstructed and 30 of them were transferred at the 3- to 6-cells stage to 5recipients. The remaining embryos were further cultured to day 7, and 24 of them transferred at compact morula/blastocyst stage to8 recipients. In Experiment 2, 154 reconstructed embryos were transferred to 44 recipients at the 3- to 6-cells stage. Pregnancieswere attained in 0/8 and 7/49 of the uterine and oviduct-transferred recipients, respectively. One recipient maintained pregnancy toterm, displaying very high PAG levels. One morphologically normal bucardo female was obtained by caesarean section. Thenewborn died some minutes after birth due to physical defects in lungs. Nuclear DNA confirmed that the clone was geneticallyidentical to the bucardo’s donor cells. To our knowledge, this is the first animal born from an extinct subspecies.
การแปล กรุณารอสักครู่..
