Idk if this makes sense.
Obviously not via sexual reproduction but could a person’s genetic parents be of the same sex and that person be genetically indistinguishable from the rest of the population?
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This called parthenogenesis, and is a main plot line in the book Seveneves…
There’s an in development technology called in vitro gametogenesis (IVG) that would allow same sex couples as well as infertile people to have biological children. It’s been in the works for over a decade and as far as I am aware has not yet been tested on humans.
Interesting question, I found this
You can’t make a baby with two moms by simply fusing two eggs or adding one egg’s DNA to another’s. Even though the resulting embryo would have the usual 46 chromosomes, this wouldn’t work.
The reason isn’t some special string of A’s, G’s, T’s or C’s found in dad’s DNA. No, instead it has to do with chemical marks found on egg and sperm DNA. This methylation (as the marks are called) makes the DNA from each parent unique, and you need both to make a baby.
What these marks do is affect how at least 80 different genes are used. In science speak, these genes are imprinted.
As you may remember, we have two copies of each of our genes, one from each biological parent. The chemical marks shut off either the copy from the egg or sperm, depending on which has the marks present…
If an embryo’s DNA came from two parents of the same sex, then both copies of some of these imprinted genes will be shut off. And for the rest of these genes, both copies will be turned on. Embryos simply can’t survive when so many genes are out of whack. In fact, diseases like Angelman syndrome, Prader-Willi syndrome, and Beckwith-Wiedemann syndrome can happen when just one of these genes isn’t passed on properly.
You can read more here if you’re curious
I feel cheated by this answer because it seems like the limiting factor is in the natural process of embryo development and not in if the genetic material itself is compatible.
Further in the article it even says it could be possible from 2 sperm cells if you used stem cells to turn a sperm cell into an egg cell? So it is possible then. But only for males? Could you use stem cells to turn an egg cell into a sperm cell and accomplish a similar result from 2 egg cells?
…I’m left with a strong inconclusive as to whether it’s possible :(
…I’m left with a strong inconclusive as to whether it’s possible :(
Possible, yes. Possible with current technology and understanding, no.
The methylation of DNA and other ways that its functionality is modified is something that is studied in epigenetics. Such modifications can also be carriers of heritable traits (ex. a study on Icelandic families found that experiencing famine could change the likelihood of diabetes two generations later). Modifying methylation has also been investigated for treatment of genetic diseases.
Conceivably, epigenome editing could be used to modify the sperm/egg methylation to make them compatible. But, that’s probably a ways a way from being practical.
To vastly oversimplify how genetics and embryonic development works, the “default” for humans is female and men have genetic codes that overwrites these defaults during fetal development. To put it more bluntly, males have extra code which females lack.
That could explain why sperm+sperm could theoretically work using a stem cell as a mediator to remove the excess code, while egg+egg can’t do the same because you’d need to manually scribe the extra genes directly.
It’s likely possible, but not at this stage of humanity. The human genome was only unlocked in the past few decades.
Gotta remember, the body of science of any field is still itself growing. More information becomes clear all the time. What was once considered impossible is now everyday boring stuff.
There are limitations to what we can do, and what we know we can do. It isn’t until we test more and try different things and unlock new technologies that the impossible becomes possible.
The answer does say
The reason isn’t some special string of A’s, G’s, T’s or C’s found in dad’s DNA.
It’s true that two same-sex parents of either sex have the basic genetic information to create a female child (a male child needs at least one male parent) but the natural process of embryo development is a big deal!
It seems like it should be possible but there is a lot that stem cells seem to make possible that realistically we don’t know how to make them do. Only time will tell what we learn how to do.
This is wildly interesting. I know I’m far from smart, but I would have thought I would have known this by now.
Hand waving away a lot of the developmental process, you could make a male or female offspring from 2 males or a female offspring from 2 females that would be indistinguishable from the variety in the normal population.
For two females, you would have to implant one egg’s DNA into a sperm whose DNA was “stripped out” And for two males, the same but transferred into an egg. I’d say it could be done in the near future with the progress we did with CRISPR in the last decade, for instance.
The obvious solution would be to just clone the parent.
Any hypothetical attempt to simulate recombination would produce a genetic clone at best—but more likely (even if you overcame the practical issues), you’d end up replacing some of the unique material on one half of each chromosome with a copy of the genes on the other half (with a corresponding increase in the risk of genetic defects).
Yeah cloning isn’t really what I’m asking about. Interested in knowing if you can make offspring from two same sex parent cells that have similar genetic makeup/diversity to offspring with 2 different sex parent cells
I know—I’m just saying that any other theoretical solution would always be worse than cloning, because you’d lose genetic information.
Edit: See Isodisomy for details.
Obligatory “I’m not a biologist” disclaimer
You could take an X chromosome from both parents either way. And I’m pretty sure all the other chromosomes wouldn’ make that much of a difference
I had the same thought. Like the extent of my knowledge is needing either XX or XY and getting half from each parent but not really sure on the rules or specifics for how things go
Not a biologist, but I’m convinced it’s possible.
With induced pluripotent stemcells (stemcells made from nearly any cell of the body which can grow into anything too), we’ll find a way to make an egg from a man using any cells he provides. Then all you need is the other male partner’s sperm and a donor womb. Btw, the womb won’t have to be within a woman - artificial wombs are being researched.
Someone already posted the 3 parent technique. So it is at least already partially possible.
Since males have the XY chromosomes, they should be able to (theoretically) have female (XX) and male (XY) offspring. With advanced microbiology and artificial wombs, there’s no doubt in my mind that we’ll reach that point before the end of the century.
Not a biologist either. As a thought experiment it seems possible, with two women able to have a daughter, and two men either to have either a daughter or a son.
It sits one step beyond what we’ve already done to produce a child that has (in a sense) three genetic parents: https://www.ox.ac.uk/research/three-parent-baby-raises-issues-long-term-health-risks
Edit: another post already has shared that no, this isn’t possible. Thank you @NOT_RICK@lemmy.world .
