New insights into Müllerian duct differentiation provided by single cell transcriptomics in the chicken embryo.

Single cell transcriptomics reveals greater cellular complexity in Müllerian duct differentiation in chicken embryos than previously understood, identifying distinct molecular signatures for duct compartments.

• Why it matters: Understanding Müllerian duct development is crucial for insights into female reproductive tract formation and related disorders. The molecular mechanisms underlying duct differentiation and regression, especially in different sexes, remain incompletely characterized.
• What they did: The study analyzed single cell transcriptomes from chicken embryos, identifying molecular signatures for the Müllerian duct epithelium and mesenchyme, and comparing male and female duct regression patterns, including the role of DKK4.
• The result: Findings show that female ducts exhibit spatial pre-patterning and a different regression process from males, with the right duct remaining non-regressive and transcriptionally distinct, enabling deeper understanding of sex-specific duct development.