Gene editing (CRISPR) in reproduction: where things stand

CRISPR technology lets scientists ‘edit’ DNA with unprecedented precision. In reproduction, the idea of one day correcting inherited diseases before birth generates huge interest — and serious questions.

It is important to separate what is possible and permitted today from what remains experimental or prohibited.

What is gene editing?

These are tools — the best known being CRISPR-Cas9 — that locate a specific DNA sequence and modify it, correcting, removing or replacing ‘letters’ of the genetic code.

Could it correct inherited diseases?

In theory yes, for some single-gene disorders. However, most inherited conditions can already be avoided with preimplantation genetic testing (PGT), by selecting healthy embryos — without altering their DNA.

Why isn’t it used on embryos today?

Editing embryos that would lead to a birth is banned in most countries. The reasons are safety (unintended changes, ‘mosaicism’) and deep ethical concerns, since the changes are passed on to future generations.

What is the realistic use today?

Today CRISPR is used mainly in research and in therapies on body (somatic) cells, for example blood disorders — not on embryos. In fertility, it helps us better understand early embryo development.

The key message

Gene editing is a promising technology, but for reproduction it remains research-stage and not permitted on embryos. For couples with inherited diseases, PGT is today’s safe, available solution.