TRNT1 and congenital sideroblastic anemia-B-cell immunodeficiency-periodic fever-developmental delay syndrome: Recently, a cohort of patients exhibiting SIFD (Sideroblastic anemia associated with immunodeficiency, periodic fevers and developmental delay) were reported to carry mutations in TRNT1, with the range of clinical severity correlating with the degree of TRNT1 loss of function (Chakraborty et al., 2014).