Researchers Use Stem Cells to Produce Fertile Mouse Egg Cells

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This is the first time that researchers have managed to use stem cells to grow fertile mouse eggs cells in a lab dish. After being fertilized and implanted into rodent mothers, the eggs hatched and new baby pups were born. Being the world the world first for this type of experiment will help towards being able to identify genes that are prominent in both egg development and maturation.


While scientists are still a long way off growing human egg cells, it does lead to this possibility in the future. It has taken scientists a long time to get where they now regard stem cells. The new study focused on developing ways to derive egg and sperm cells from pluripotent stem cells. This was while utilizing earlier developed techniques involving mouse embryonic stem (ES) cells and induced pluripotent stem (iPS) cells.

Mice derived from labmade eggs were normal, fertile adults. O. Hikabe et. al., Nature 538, 7625 (20 October 2016) © MacMillian Publisher Ltd.
Mice derived from labmade eggs were normal, fertile adults.
O. Hikabe et. al., Nature 538, 7625 (20 October 2016) © MacMillian Publisher Ltd.

During the study, the researchers inserted precursor cells into clusters of cells extracted from fetal mouse ovaries. These were then carefully harvested for a period of around one month. These lab-based ovaries managed to produce, on average, around 50 mature eggs cells each, with over 75% having the correct number of chromosomes. However, when they went on to produce two-cell embryos only 3% of the embryos that were implanted grew to full term pups, and as of yet, the scientists are unsure why this figure is so low. It’s clear there is still further research to be done here, but once scientists do get the process right, it could be a breakthrough for women who suffer from infertility problems.



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