Whereas many of the mutations responsible for hydrocephalus have an autosomal recessive pattern of inheritance, some display X-linked (L1CAM, AP1S2) (Okamoto et al. 1996; Saillour et al. 2007) or autosomal-dominant (CFAP43, FOXJ1) inheritance patterns (Wallmeier et al. 2019; Shapiro et al. 2021; Morimoto et al. 2019). The gene discussed is FOXJ1; the disease is Hydrocephalus.