This is despite the fact that mutations in DUOX2 and DUOX1 have been shown to be associated with congenital hypothyroidism in humans for more than a decade (Aycan et al., 2017; Donkó et al., 2014; Jin et al., 2014; Johnson et al., 2007; Kizys et al., 2017; Tonacchera et al., 2009; Vigone et al., 2005). This evidence concerns the gene DUOX1 and congenital hypothyroidism.