~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The Raelian Movement
for those who are not afraid of the future : http://www.rael.org
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Source: http://www.biotechniques.com/news/biotechniquesNews/biotechniques-335624.html
Milk from dairy cows contains a whey protein called β-lactoglobulin (BLG) that isn't found in human milk. It's estimated that 2-3% of babies are allergic to cow milk and BLG is thought to be a major cause of these allergies, which can cause diarrhea and vomiting.
for those who are not afraid of the future : http://www.rael.org
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Source: http://www.biotechniques.com/news/biotechniquesNews/biotechniques-335624.html
Genetically Engineered Cow Produces Hypoallergenic Milk
10/02/2012
Melissa Lee Phillips
New Zealand researchers have engineered a cow that produces hypoallergenic milk, according to a paper in this week's Proceedings of the National Academy of Sciences(1). They used RNA interference (RNAi), in which small RNA molecules prevent protein expression, to knock down production of an allergenic milk protein.
Baby formula based on cow's milk is hydrolyzed to break down whey proteins, but the remaining peptides can still cause allergic reactions. To remove BLG completely from milk, researchers have been interested in developing transgenic cows, said study author Stefan Wagner, a scientist at AgResearch in Hamilton, New Zealand.
Attempts to knock-out gene expression in livestock animals have been largely unsuccessful, so Wagner and his colleagues tried another approach, RNAi. They artificially created microRNA molecules that interfere with BLG expression. They first tested these molecules in vitro to find the version best able to block BLG production.
After selecting one BLG microRNA and testing its efficacy in genetically engineered mice, the researchers inserted DNA encoding it into the cattle genome and used nuclear transfer to create genetically modified cow embryos. Out of about 100 embryos, they achieved five pregnancies, only one of which led to the birth of a calf, named Daisy.
When Daisy was seven-months-old, the researchers induced lactation and found that her milk contained no detectable BLG. They also found that all the other major milk proteins, especially the caseins, are present at abnormally high levels in Daisy's milk—which the authors suggest should mean higher-calcium milk and potentially increased cheese yields.
But getting such milk approved for consumers will be a lengthy process. Currently, the researchers are attempting to demonstrate that the milk is in fact less allergenic to mice. "We're not yet testing this for clinical trials," said Wagner.
Meanwhile, they hope to use a BLG-free line of cows to study BLG's role in milk. It's thought that BLG can be removed from milk without greatly altering its properties, but its exact biological role is still a mystery. "These animals will help us to get a better idea of what this protein actually does," said Wagner.
Reference
1. Anower, J., S. Wagner, J. McCracken, D. N. Wells, and G. Laible. 2012. Targeted microRNA expression in dairy cattle directs production of β-lactoglobulin-free, high-casein milk. PNAS. Published online October 1, 2012.
--
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
"Ethics" is simply a last-gasp attempt by deist conservatives and
orthodox dogmatics to keep humanity in ignorance and obscurantism,
through the well tried fermentation of fear, the fear of science and
new technologies.
There is nothing glorious about what our ancestors call history,
it is simply a succession of mistakes, intolerances and violations.
On the contrary, let us embrace Science and the new technologies
unfettered, for it is these which will liberate mankind from the
myth of god, and free us from our age old fears, from disease,
death and the sweat of labour.
Rael
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Tell your friends that they can subscribe to this list by sending an email to:
subscribe@rael-science.org
- - -
To unsubscribe, send an email to:
unsubscribe@rael-science.org
- - -
0 ความคิดเห็น:
แสดงความคิดเห็น