BackgroundPolycystic ovary syndrome (PCOS) is a heterogeneous disorder, affecting around 10% of women of reproductive age, with infertility, depression or anxiety, obesity, insulin resistance and type 2 diabetes as risk factors. The cause of PCOS is not known but there is a predisposition to developing PCOS in adult life that arises during fetal or perinatal life. PCOS also has a genetic predisposition and a number of genetic loci associated with PCOS have been identified. These loci contain 25 candidate genes which are currently being studied to define the syndrome. Although the name PCOS suggests a syndrome of the ovary, PCOS has also been associated with the central nervous system and other organ systems in the body due to the wide variety of symptoms it presents.MethodsHere, we examined the expression patterns of PCOS candidate genes in gonadal (ovary and testis), metabolic (heart, liver and kidney) and brain (brain and cerebellum) tissues during the first half of human fetal development and postnatally until adulthood using public RNA sequencing data. This study is an initial step for more comprehensive and translational studies to define PCOS.ResultsWe found that the genes were dynamically expressed in the fetal tissues studied. Some genes were significantly expressed in gonadal tissues, whilst others were expressed in metabolic or brain tissues at different time points prenatally and/or postnatally.HMGA2,FBN3andTOX3were highly expressed during the early stages of fetal development in all tissues but least during adulthood. Interestingly, correlation between expression ofHMGA2/YAP1andRAD50/YAP1were significant in at least 5 of the 7 fetal tissues studied. Notably,DENND1A, THADA, MAPRE1, RAB5B, ARL14EP, KRR1, NEIL2andRAD50were dynamically expressed in all postnatal tissues studied.ConclusionsThese findings suggest that these genes have tissue- or development-specific roles in multiple organs, possibly resulting in the various symptoms associated with PCOS. Thus the fetal origin of a predisposition to PCOS in adulthood could ariseviathe effects of PCOS candidate genes in the development of multiple organs.