FAM111B and myopathy: Autosomal dominant mutations found in the FAM111B gene are the primary cause of hereditary fibrosing poikiloderma with tendon contractures, myopathy, and pulmonary fibrosis (POIKTMP), a rare disorder with 37 confirmed cases (Figure 1A) (Khumalo et al., 2006; Mercier et al., 2013; Mercier et al., 2015; Seo et al., 2016; Goussot et al., 2017; Takeichi et al., 2017; Chen et al., 2019; Zhang et al., 2019; Dokic et al., 2020; Roversi et al., 2021; Hoeger et al., 2022; Macchiaiolo et al., 2022; Takimoto-Sato et al., 2022; Wu et al., 2022).