Phenotypic expansion of Zimmermann- Laband syndrome associated with cardiac and hearing loss: a case report

Background: ATP6V1B2 gene mutation is associated with Zimmermann-Laband syndrome 2 (ZLS2), which is a rare developmental disorder characterized by nail hypoplasia and hereditary deafness. Case Presentation: We report a new phenotypic mutation of ATP6V1B2 associated with ZLS 2. The patient has atresia of the left pulmonary artery (LPA) and features of hearing loss and nail hypoplasia. The other interesting part is that the child had two types of mutations inherited from father and mother. He is carrier for GJB2 mutation (inherited from father) and diseased with ATP6V1B2 mutation (inherited from mother). Conclusion: The association of ZLS features with absent LPA was not reported previously in the literature. This finding will add new information to the database of previously reported ATP6V1B2 rare mutations.