Finally, we also explored the expression of PTPRD in human placental cell lines and placental tissue, since foetal genetic loci close to PTPRD—previously implicated in neurodevelopment—may be of use as biomarkers for environmental exposures during pregnancy, whilst asprosin can act as a biomarker in pregnancy complications associated with maternal obesity (e.g., GDM) [20]. The gene discussed is PTPRD; the disease is gestational diabetes.