CERKL and retinitis pigmentosa 1: Moreover, mutations in a single gene appear to be associated to distinct clinical entities [2], as is the case for CERKL, that was initially characterized as an autosomal recessive Retinitis Pigmentosa (RP) gene [3], [4], [5], [6], [7], [8], and later shown to promote Cone-Rod Dystrophy (CRD), a RD disorder associated to a more severe phenotype [9], [10].