Researchers Create Mouse With Two Fathers, Say Humans Could be Next
December 9, 2010 11:43 AM
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Scientists have created mice with two fathers. A surrogate mother is required, but her DNA isn't passed to the selected offspring..
(Source: Science Museum)
The laws of nature are being seriously bent by this Texas team
Two male mammals can not reproduce with each other, right? That's what you learned in your biology class, certainly. Well turns out, like many laws of nature, there can be exceptions, with a certain amount of trickery. Researchers at the
M.D. Anderson Cancer Center
in Houston, Texas have bent the rules of mammalian biology and created a pair of mice, one male one female, that have two fathers and no maternal sex chromosomes.
The MDACC team of reproductive biologists, led by
Dr. Richard R. Berhringer
first took fibroblasts (connective tissue cells) from the first male (XY) father mouse, when he was just a fetus. The fibroblasts were selected as they are easy to
induce into pluripotency
, a method of producing non-embryonic stem cells. The induced pluripotent stem cells (iPSCs) were then cultured.
During the culturing something funny happened -- the Y allele disappeared in some of the cells. This proved a critical step in producing two-father babies. The XO cells were then transplanted into the blastocyst (developing embryo) of a mouse surrogate mother. The resulting female chimera children (a second surrogate mother), which had a mix of XO/XX sex chromosomes. The females (which bore the paternal chromesome from the first father) were then mated with the second father.
The end result of this rather confusing process was that some of the children had sex chromosomes from both fathers, or both mothers. They also likely inherited autosomes from each father.
The team proclaims, "Our study exploits iPS cell technologies to combine the alleles from two males to generate male and female progeny, i.e. a new form of mammalian reproduction."
The researchers speculate that they could also use the technique to get the mouse to self reproduce. They state, "It is also possible that one male could produce both oocytes and sperm for self-fertilization to generate male and female progeny."
the work in the journal
Biology of Reproduction
They say that it could be leveraged to save
. If only two males were in captivity, a surrogate mother of a similar species could be used to birth a Chimera which would produce oocytes (eggs) from the first father, resulting in two fathers being able to pass their genetic legacy on to offspring.
Applications may also lie in livestock breeding. Typically livestock are selected for favorable characteristics. But what if two males
have certain very favorable genetic traits? This technique could allow those strengths to be merged.
Last, but not least, the team's most controversial suggestion is that using a varied iPS technique, human oocytes (eggs) could be produced from a father's cells. This could lead to two men being able to synthetically reproduce, certainly a controversial technology. The only question left is whether two females could be made to reproduce as well? We'll have to wait and see for future studies on that topic.
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Not ready for Star Trek yet
12/9/2010 5:37:04 PM
“A surrogate mother is required, but her DNA isn't passed to the selected offspring"--not exactly true, plus DNA isn’t everything. The baby would inherit mitochondrial DNA and imprinting from the surrogate mother. The imprinting depends upon the mother’s environment—for example, undernourished mothers produce offspring with higher rates of obesity/diabetes, since the fetuses are programmed to conserve energy.
The extension of this idea to humans is a huge leap of faith. Mice with behavioral or genetic problems aren’t that hard to deal with, but humans with these issues are. Taking DNA from one father, subtracting a Y and adding an X to a single cell, putting it in a surrogate, then fertilizing the cells would be tremendously expensive and complicated with huge risks. The couple would be better off paying for one child from each father with a donated egg than to produce a super expensive hybrid child with huge medical bills.
RE: Not ready for Star Trek yet
12/10/2010 8:41:32 AM
It is also worth noting the middle step. To accomplish this, a chimera is produced having variable percentage of the first father’s cells. Now it also has to be a germline chimera. This chimera has to be born and raised to be old enough to have children (what do you do with the chimeras when your done using them as a womb for rent?), and even then only some of the children will have the first father’s genome. To say this is ethical, economical or even chronologically acceptable in humans is stretching things a bit to say the least.
Unfortunately this is the current state of science. The discovery is scientifically minimal at best (hence the journal it was published in). More and more institutes are hiring Madison Avenue spin doctors as deans of communication and such to produce press releases with statements that (hopefully) no real scientists would ever seriously suggest. It draws press attention and hopefully peaks interest for financial donations. The down side it stretches scientific creditability and some “promises” will ultimately lead to public disillusionment with science when they cannot be fulfilled.
RE: Not ready for Star Trek yet
12/10/2010 3:47:23 PM
that thing of sci-fi super-human farms would make a "mother" irrelevant, and reduce women to simply being around for sex and sandwiches
TAKE THAT FEMINISTS!
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