In a Greb1l knock-out mouse, Müllerian ducts are missing (De Tomasi et al., 2017) and a study using whole-genome sequencing in patients with Müllerian agenesis found possible causative mutations in the GREB1L gene (Jacquinet et al., 2020). This evidence concerns the gene GREB1L and Mayer-Rokitansky-Kuster-Hauser syndrome type 1.