Healthy Mouse Offspring Produced from Mother's Skin Cells

https://www.scientificamerican.com/article/healthy-baby-mice-produced-from-mouse-mom-s-skin-cells/

My article described the process of taking skin cells from a mouse and generating eggs that were fertilized and led to healthy offspring. Skin cells from the tail of a female mouse were taken, transformed into egg cells, matured into eggs and then fertilized and implanted into a female mouse. The article did not specify where the sperm came from for fertilization but I assumed it was pulled from a male mouse. Stem cell biologist Katsuhiko Hayashi has been working on this process for the past 4 years. He hopes to successfully be able to produce a healthy human by this process in the future, although he says it is still up to twenty years away. Despite the experiment being successful, there was only one percent that led to the birth of a new mouse.

My initial thought on the successful experiment was how did they get somatic cells (skin cells) to transform into gametes capable of successfully combining (fertilization) without mutations. Maybe this is easier than I have assumed, but from what I have learned in class, it is the opposite direction of normal cell reproduction. In the article, it states that to achieve this they “had to design an environment that recapitulated cell signaling and promoted development through several stages”. I know very little about cell signaling, but again, being able to manipulate that process without serious mutation is impressive. Although the experiment was successful, I could assume that the limited success rate of live births (one percent) could be attributed to mutations.

The fascinating part of this is the possibilities that it opens up for humans. The article theorizes that this same process could be used to help repopulate endangered animal species and to even allow same sex couples to have a child of their own genetic make up. I do not know if the process of creating an egg cell from a somatic cell would be the same as creating a sperm cell from a somatic cell. For example, if two women wanted to have a child made up of their own genetic material and scientists created an egg cell from one of their skin cells. To fertilize the cell, would the sperm cell needed come from the female? Is that possible without her being male? The article did not go into if creating a gamete of the opposite kind from a female or male was a problem or even possible.

To end the article, Hayashi states that one issue stopping this experiment from moving to human trials is an ethical one. It is allowable to examine and then dispose of a large number of fertilized embryos of mice but doing so with human embryos is not ethically acceptable.

Overall, I enjoyed the article and found the content interesting. I found several other articles on cloning and artificial reproduction and had to choose just one. Like I stated above and in the article, this type of research could lead to some big advances in helping endangered species or even food sources. This field of research sparks my imagination and I'm excited to see where it goes.

AG