Sulfite οxidase deficiency (OMIM # 272300) is a very rare AR MD that typically manifests in the neonatal or early infantile period and is caused by lοss-of-functiοn pathogenic variants in the sulfite oxidase (SUOX) gene (chromosome 12q13.2) (Zhao et al. 2021). Here, SUOX is linked to Menkes disease.