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In mammals, germ cells originate outside of the developing gonads and follow a unique migration pattern through the embryonic tissue toward the genital ridges. Many studies have attempted to identify critical receptors and factors involved in germ cell migration. However, relatively few reports exist on germ cell receptors and chemokines that are involved in germ cell migration in avian species. In the present study, we investigated the specific migratory function of C-X-C chemokine receptor type 4 (CXCR4) in chicken primordial germ cells (PGCs). We induced loss-of-function via a frameshift mutation in the CXCR4 gene in chicken PGCs using clustered regularly interspaced short palindromic repeat-CRISPR-associated protein 9 (CRISPR/Cas9) genome editing. The migratory capacity of CXCR4 knockout PGCs was significantly reduced in vivo after transplantation into recipient embryos. However, CXCR4-expressing somatic cell lines, such as chicken DT40 and DF1, failed to migrate into the developing gonads, suggesting that another key factor(s) is necessary for targeting and settlement of PGCs into the genital ridges. In conclusion, we show that CXCR4 plays a critical role in the migration of chicken germ cells.

C-X-C chemokine receptor type 4 (CXCR4) is a key receptor for chicken primordial germ cell migration