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b]Mice have been born from eggs derived from male cells
A method for turning male cells into egg cells in mice could one day be used to help men in a same-sex couple have children who are genetically related to them both
By Michael Le Page[/b]Calendar icon
8 March 2023
Seven mice have been born using a process that involves turning male cells into egg cells and then fertilising them with sperm. The technique could one day allow two men in a same-sex couple to have children – with the help of a surrogate mother – who are genetically related to both of them. It could also help women with certain chromosomal conditions to have children that are biologically related to them.
The original aim of the research was to investigate options for treating infertility in women who have only one X chromosome instead of two, said Katsuhiko Hayashi at Kyushu University in Japan at the Third International Summit on Human Genome Editing in London on 8 March. The symptoms of the condition, known as Turner syndrome, vary widely but almost always include infertility because normal egg development requires two X chromosomes.
Hayashi and his team wanted to see if cells with one X could be turned into cells with two Xs. To do this, it is easiest to start with male cells, which contain one X and one Y, as the Y is the smallest and most dispensable chromosome – and it is often lost naturally.
The researchers created stem cells from 8-week-old male mice and picked out ones that spontaneously lost the Y chromosomes. They then manipulated the cells in a way that resulted in a few obtaining two copies of the X after cell division – normally the two cells resulting from division should only have one copy each.
“The biggest trick of this is the duplication of the X chromosome,” says Hayashi, whose team has previously developed methods for turning mouse stem cells into eggs.
The researchers used these methods to turn the XX cells into egg cells and used sperm from male mice to fertilise them. Over 600 embryos were then implanted into female mice, resulting in seven apparently healthy pups, said Hayashi.
https://www.newscientist.com/article/2363627-mice-have-been-born-from-eggs-derived-from-male-cells/