TTC19 and cerebellar ataxia: After this paper few other patients have been reported with TTC19 mutations, all presenting isolated cIII deficiency, but various clinical-radiological phenotypes: severe olivo–ponto–cerebellar atrophy and progressive psychosis in Portuguese siblings from a consanguineous family (Nogueira et al., 2013), Leigh syndrome in a Hispanic 4 year-old boy (Atwal, 2013), or adult-onset spinocerebellar ataxia in a Japanese woman (Morino et al., 2014).