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Shedding new light on DNA repair in early human embryos, with implications for gene editing (opens in a new tab)

medicalxpress.com · 2026-09-12

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Claim 1 of 5Not checkedThe article says the new study, published in Nature and led by Štěpán Jeřábek, provides the first detailed comparison of how human embryos respond to two different types of DNA damage.View evidenceHide evidence

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Claim 2 of 5Not checkedIt reports that early human embryos are able to effectively repair single-strand DNA damage, whereas repair of double-strand breaks is significantly less reliable at this stage of development.View evidenceHide evidence

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Claim 3 of 5Not checkedTo examine these mechanisms, the researchers used CRISPR-Cas9 to introduce double-strand breaks and base editing to create single-strand nicks in two well-studied genes, then assessed the embryos' repair responses.View evidenceHide evidence

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Claim 4 of 5Not checkedThe researchers successfully isolated stem cells from the edited six-day-old embryos, which the article says enabled more detailed genetic analyses and study of later cellular consequences.View evidenceHide evidence

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Claim 5 of 5Not checkedThe article emphasizes that the work is basic research and does not establish gene editing of human embryos as clinically ready; the authors say important safety questions remain before such methods could be considered for clinical use.View evidenceHide evidence

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Highly efficient base editing at PCSK9 and normal human embryo development

Nature · 2026

Source record (opens in a new tab)

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The selected paper, plus nearby candidates.

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Machine-translated ParlSpeech V2 dataset: Full-text corpora of 3.5 million parliamentary speeches from seven countries translated into English

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And 33 more candidates considered.