Conception grew mini-ovaries from a blood draw, and the thread argued about mitochondria
From a routine blood draw, Conception reprogrammed cells into stem cells, then coaxed them into miniature human ovaries holding early eggs, which it calls the first human follicles built entirely from iPSCs.
Conception says it turned a blood draw into induced pluripotent stem cells, then grew them into 3D "mini-ovaries" where cells ran the real script of egg-making: oogonia, meiosis, and early follicles, the first human follicles built entirely from iPSCs.
The flip came fast: eggs from adult cells may inherit mitochondrial damage that normally takes hundreds of generations to clear, though others note mitochondrial transplants already exist. Clinical use is still years off.
From a blood draw to a mini-ovary
Conception says it started with the simplest possible input: a blood draw. The company reprogrammed those blood cells into induced pluripotent stem cells, then steered them into two lineages at once, the primordial germ cells destined to become eggs and the ovarian helper cells that support them, growing both together as three-dimensional "mini-ovaries." Inside, the cells advanced through the genuine stages of egg development: oogonia formed, entered meiosis, and organized into follicles. Conception calls these the first human follicles created entirely from iPSCs.
The scale is striking for a proof of concept: thousands of mini-ovaries holding millions of future egg cells, run in parallel to refine each step. Clinical use remains years away; the next milestone is coaxing the early follicles up to the "antral" stage where a fertility clinic could retrieve a mature egg, followed by long safety work.
The mitochondria fight
Reactions divided between readers who treat egg aging as a solvable engineering problem and those uneasy about baking changes into a future person. The sharpest technical doubt targeted the cell's power plants:
"Using adult cell, even a stem cell to make an egg probably gives it mitochondrial damage that usually takes hundreds of human generations to accumulate." — an established HN commenter
A reply pushed back on the reflex to dismiss:
"it is unlikely that you just punched a hole through the plan of the several dozen people in bioengineering, life sciences, and other related fields that are at this company." — a long-time commenter
A separate fear, that mixing artificial and natural conception erodes fitness across generations, met a data-based answer:
"25% of humans died before reaching 5 in 1800s US, today it is <1%… We have not ended up with 'humans which aren't as strong, aren't as smart, aren't as well adapted to a changing environment'" — a senior software engineer
The objection with no lab fix is consent: unlike a therapy whose risk stays with the patient, an engineered egg passes any hidden cost to a person who never agreed to the experiment.
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