Monarch Disease Ontology id MONDO_0800465 (CTSC-related disorder) is any ectodermal dysplasia syndrome in which the cause of the disease is a variation in the CTSC gene. Variations in the CTSC gene can result in (1) Papillon-Lefevre syndrome (PLS) characterized by palmoplantar keratoderma, severe periodontitis affecting deciduous and permanent dentitions, and premature loss of dentition, (2) Haim-Munk syndrome (HMS) with additional features of arachnodactly, acroosteolysis, pesplanus, and onychogryphosis, (3) aggressive periodontitis 1 (AP1) characterized by severe and protracted gingival infections, leading to tooth loss. All three phenotypes are associated with autosomal recessive inheritance.