Heimler Syndrome 1, also known as deafness-enamel hypoplasia-nail defects syndrome, is related to peroxisome biogenesis disorder 1a and zellweger spectrum disorder. An important gene associated with Heimler Syndrome 1 is PEX1 (Peroxisomal Biogenesis Factor 1), and among its related pathways/superpathways are Cell adhesion_ECM remodeling and a6b1 and a6b4 Integrin signaling. Affiliated tissues include skin and brain, and related phenotypes are intellectual disability and diabetes mellitus