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Previous studies had identified 22 genetic risk loci -- that is, regions of our genome that contain changes associated with increased risk of developing the condition.

They examined the X chromosome, which earlier studies did not do, and found five loci linked with PTSD.

By enabling researchers to swiftly pinpoint genomic loci for targeted gene integration, CRISPR-COPIES provides a streamlined pipeline that facilitates the identification of stable integration sites across the genome.

First, in collaboration with researchers at Stanford Medicine, the researchers matched CAD loci previously identified through genome-wide association studies to genes impacted by these genetic variants.

They identified a total of three risk loci in the genome.