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Home » Baby Customization w/ Kian Sadeghi on Tucker Carlson Show (Transcript)

Baby Customization w/ Kian Sadeghi on Tucker Carlson Show (Transcript)

Editor’s Notes: In this episode, Tucker Carlson sits down with Kian Sadeghi, the founder and CEO of the biotech company Nucleus, to explore the complex ethical landscape of genetic testing and IVF. They dive into the controversial practice of “baby customization,” discussing how modern technology allows parents to screen embryos for traits ranging from hereditary diseases to IQ and height. The conversation tackles deep philosophical questions regarding eugenics, the role of human agency in reproduction, and the potential societal consequences of treating genetic optimization as a consumer product. (April 14, 2026)

TRANSCRIPT:

Introduction

TUCKER CARLSON: Thanks for doing this. I appreciate it. I’ll just say at the outset, which I told you off camera, I disagree with this conceptually, I think, but I’m also completely ignorant of the details.

KIAN SADEGHI: Yeah.

TUCKER CARLSON: So I kind of want to know what this is before even asking you questions about whether it’s a good idea. Can you just— I’ll just stand back and let you explain what you’re doing.

KIAN SADEGHI: Yeah. So first, thanks for having me on.

TUCKER CARLSON: Of course.

What Is IVF?

KIAN SADEGHI: Patients, there’s one way of reproducing via IVF, right? So you can conceive naturally via sex, or maybe if you’re infertile or if you have some sort of hereditary disease or for some other reason you do IVF. When you do—

TUCKER CARLSON: Yeah, I’m sorry, I’m going to— I specialize in dumb questions. Can you explain for people who don’t know what is IVF? Yeah. What is IVF?

KIAN SADEGHI: IVF stands for in vitro fertilization. So basically imagine the egg and the sperm, right? The foundation of life to make an embryo. It’s basically putting those things together in a clinic. Right. And then basically you take that embryo and you would transfer it into a woman and then it would implant and the woman’s pregnant.

TUCKER CARLSON: So conception takes place outside the womb.

KIAN SADEGHI: Correct.

TUCKER CARLSON: Okay. Yeah.

How Genetic Optimization Works

KIAN SADEGHI: And so during this process of IVF, what you do is today, even if Nucleus didn’t exist, even if genetic optimization didn’t exist, you make several embryos. Okay. So when you’re in an IVF clinic, you make several embryos. The amount of embryos you end up making, it varies, but you might have 4 or 5.

You actually do genetic testing on these embryos to identify things like chromosomal abnormalities, like Down syndrome, for example. So that’s very commonplace. That’s done in basically every IVF clinic in the United States. They will actually screen embryos, the genetics of the embryos, to see if they have some sort of severe chromosomal abnormality.

What we do is we basically provide more information on the embryos. So we also read the DNA, but now we give information on things like other hereditary disease risk, also chronic diseases, things like cancers, Alzheimer’s, diabetes, also traits like IQ or height, et cetera.

So to be clear, we’re not changing any DNA. There’s this process in IVF where you make embryos already. Genetic testing is done on embryos. What we do now is we provide you a little bit more information on your embryos. Basically, that information can be used to implant which embryo the couple deems to be best. So basically give more information to couples to then choose which embryo they want to implant.

Can Genetics Determine IQ?

TUCKER CARLSON: I don’t want to derail this conversation 2 minutes in.

KIAN SADEGHI: Okay.

TUCKER CARLSON: But you just said we can tell the IQ of a person by the genetics?

KIAN SADEGHI: So IQ—

TUCKER CARLSON: I was reliably informed IQ is not real, okay? And it’s not determined by genetics.

KIAN SADEGHI: So there’s— I think it’s helpful to think about all these different characteristics from diseases to traits, right? People know intuitively something like height, for example, right? Height, they say, oh, that’s genetic. Or something like breast cancer, eye color, right? Yeah. These things people intuitively know are genetic. And so you can actually basically take these different phenotypes and measure how genetic any phenotype is.

So what does it actually mean? The most simple way of explaining it is imagine you took two identical twins, so they have the same DNA, and then basically you separated the twins, they grew up in different environments. Sometimes in pop culture, people hear about these different things where you actually take twins and they have, again, the same DNA, they’re identical DNA, and then they grow up in different places for whatever reason, so they’re subject to different environments. And then you can actually measure basically how similar they are across all these different phenotypes to see basically how genetic something is.

TUCKER CARLSON: Twin studies.

KIAN SADEGHI: Yes, twin studies. Yes. And so using twin studies, you can actually get measurements of things from diseases, right, like cancers and diabetes and Alzheimer’s, as mentioned, to things like height or IQ or BMI, et cetera. So twin studies show that IQ specifically is about 50% genetic.

But to be clear, IQ is just one of over 2,000 factors that we actually look at, right? Principally, parents and patients, they come for disease. They always come for disease. And remember that when the embryos you’re picking from, the most important determinant of the genetics of your embryos is, well, your partner, right?

So you’re actually not changing DNA. This is not gene editing. You’re not changing DNA. You’re not making an embryo’s DNA better. You’re basically reading the embryo’s DNA that you have. So when you pick your partner, you’re basically picking the kind of genetic pool, and then you can basically pick which embryo you deem to be best based off of your preferences and values.

The Bell Curve and the Genetics Debate

TUCKER CARLSON: I mean, again, I just want to say thank you for doing this.

KIAN SADEGHI: Yeah, absolutely.

TUCKER CARLSON: I’m not here to attack you at all.