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The embryonic Müllerian ducts give rise to the female reproductive tract (fallopian tubes, uterus and upper vagina in humans, the oviducts in birds). Embryonic Müllerian ducts initially develop in both sexes, but later regress in males under the influence of anti-Müllerian hormone. While the molecular and endocrine control of duct regression in males have been well studied, early development of the ducts in both sexes is less well understood. Here, we describe a novel role for the adhesion G protein-coupled receptor, GPR56, in development of the Müllerian ducts in the chicken embryo.  GPR56  is expressed in the ducts of both sexes from early stages. The mRNA is present during the elongation phase of duct formation, and it is restricted to the inner Müllerian duct epithelium. The putative ligand, Collagen III, is abundantly expressed in the Müllerian duct at the same developmental stages. Knockdown of  GPR56  expression using  in ovo  electroporation results in variably truncated ducts, with a loss of expression of both epithelial and mesenchymal markers of duct development. Over-expression of GPR56  in vitro  results in enhanced cell proliferation and cell migration. These results show that GPR56 plays an essential role in avian Müllerian duct development through the regulation of duct elongation.

Adhesion G-protein-coupled receptor, GPR56, is required for Müllerian duct development in the chick