Comment by gatane
Trans people have been around ages, same as gays and all that. Yet no gay gene discovered.
We know that a living being is just not only DNA, but also its environment; now on top of that add all the big complexity of human social behaviour and gender into it. I doubt they will find a "cause" to trans-ness.
I’m not saying there is evidence that it has the same root cause, or even that there are more trans people now than before (I haven’t seen the numbers), but kids are hitting puberty 2+ years earlier now, probably because of endocrine disruptors.
As a thought experiment, it seems hard to intentionally design a drug that changes what year puberty onset starts at without having some impact on LGBTQ+ prevalence.