Hi -- Marlene posted this, and she said she didn't have time to check it, so I have added what Google had to say about it at the end. A couple of the sources they listed were serious good sources.
It's about twin studies that show being trans is somewhat heritable because identical twins are far more likely to both be trans than non-identicle twins are, and more than in the general population.
--Kim
I don't know Josh Helfgott, so I don't know if his reporting can be considered accurate without my checking further, which I don't have time to do right now, since this is a work day. But the science as he reports it seems sound, and consistent with other science I have read about transsexuality. I've never seen this study mentioned before, though. That's a lot of identical twins. Great for identifying genetic versus social conditioning.
BREAKING
The "social contagion" line politicians have used to strip trans kids of health care just ran into 463 sets of twins.
The "social contagion" line politicians have used to strip trans kids of health care just ran into 463 sets of twins.
The research pooled 463 twin pairs in which at least one twin was trans, the most comprehensive analysis on this question to date. Among identical twins, who share 100% of their genes, both twins were trans in 21.2% of pairs. Among non-identical twins, who share about half their genes, it was 8.7%. In the general population the rate sits at roughly 1%.
The team at the Murdoch Children's Research Institute in Melbourne recruited 27 twin pairs through two Australian gender clinics, confirmed who was identical with DNA testing where they could, then combined their results with three earlier twin studies.
That step-wise pattern, where the chance both twins are trans rises with genetic similarity, is not what a social trend picked up from friends or the internet looks like.
Most identical pairs in the data were not both trans, which is also true of height, personality and sexuality. Almost every human trait is shaped by genes and environment together.
The 2024 Cass Review in the UK, used by governments to justify restricting gender care for young people, leaned on a single Swedish study to argue that environmental influences during pregnancy were a more likely explanation than genetics.
That Swedish study never tested whether its twins were identical. The new analysis, with 335 same-sex pairs against Sweden's 40, found NO support for the prenatal hormone theory at all.
The belief that being trans is purely social is the rationale behind conversion therapy, a practice condemned by EVERY major Australian and US medical association.
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This reminds me of the whole "born that way" business about sexual orientation, which in my humble opinion bypasses an important point: it doesn't matter how a person came to be gay, or bi, or trans, or whatever. Maybe they're wired that way, maybe they're doing it because all the cool kids are doing it, maybe they're cadging an inheritance out of a rich uncle (though that usually involves acting straight). Whatever their reason, it's THEIR damn business. If their genes made them that way, fine. If "social contagion" did it, who cares? It's not up to us to determine the legitimate way to become oneself.
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John: Yes.
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AI Overview
Twin studies on transgender and gender-diverse identities suggest a moderate genetic influence, though sample sizes remain small.
Key Findings
- Concordance Rates: Identical or monozygotic (MZ) twins show higher rates of shared transgender or gender-diverse identity (concordance) than non-identical or dizygotic (DZ) twins. Studies like those by Milton Diamond estimate that around 20% to nearly 40% of MZ twin pairs are concordant for trans identity, compared to much lower or near-zero rates in same-sex DZ pairs. [1, 2, 3]
- Heritability Estimates: Statistical modeling from registry data estimates the heritability of gender dysphoria or gender incongruence to range widely—from roughly 39% up to over 60% depending on the specific cohort and age group analyzed. [1, 2]
- Environmental and Prenatal Factors: Because identical twins do not show 100% concordance, non-shared environmental factors and prenatal or intrauterine hormonal influences also play a significant part in shaping gender identity. [1, 2]
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