Dominant gain-of-function mutations in STIM1 and ORAI1 are linked to development of tubular aggregate myopathy (TAM) and Stormorken syndrome (Böhm et al. 2013, 2017; Misceo et al. 2014; Nesin et al. 2014; Böhm and Laporte 2018). Here, STIM1 is linked to transient myeloproliferative syndrome.