The expression of aquaporin 8 and aquaporin 9 in amniotic membrane of oligohydramnios group is significantly lower than that of normal amniotic fluid group, however, it has not been shown which lncRNAs regulate the expression of aquaporin 8 and aquaporin 9 in oligohydramnios group [27]. This evidence concerns the gene AQP9 and oligohydramnios.