PRJNA494291
Talpa occidentalis isolate:TD23 Genome sequencing and assembly
Linking genomic variation to phenotypical traits remains a major challenge in evolutionary genetics. In this study, we use  phylogenomic strategies to investigate a distinctive trait among mammals: the development of masculinizing ovotestes in female moles. By  combining a chromosome-scale genome assembly of the Iberian mole, Talpa occidentalis, with transcriptomic, epigenetic, and chromatin interaction  datasets, we identify rearrangements altering the regulatory landscape of genes with distinct gonadal expression patterns. These include a tandem triplication involving CYP17A1, a gene controlling androgen synthesis, and an intrachromosomal inversion involving the pro-testicular growth factor FGF9, which is heterochronically expressed in mole ovotestes. Transgenic mice with a knock-in mole CYP17A1 enhancer or overexpressing FGF9 showed phenotypes recapitulating mole sexual features. Our results highlight how integrative genomic approaches can reveal the phenotypic impact of noncoding sequence changes.