Poikiloderma with Neutropenia, also known as pn, is related to neutropenia and rothmund-thomson syndrome, type 2. An important gene associated with Poikiloderma with Neutropenia is USB1 (U6 SnRNA Biogenesis Phosphodiesterase 1). Affiliated tissues include skin and bone marrow, and related phenotypes are carious teeth and palmoplantar keratoderma