CRISPR baby mutation significantly increases mortality

Six months ago, a Chinese scientist announced that he had edited the genomes of two babies born last year. The germline edits with CRISPR-Cas9 supposedly changed the CCR5 gene to prevent HIV from invading immune cells. An analysis of records in the U.K. Biobank shows that having two copies of this mutation is associated with a 21 percent increase in mortality.

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