Dominant mutations in kcnj13 in D. rerio cause pigment pattern defects but also late-onset retinal degeneration (Toms et al., 2019a, b), similar to mutations in the human orthologue that are known to cause two rare retinal diseases (Hejtmancik et al., 2008; Sergouniotis et al., 2011). The gene discussed is KCNJ13; the disease is retinal degeneration.