RPGR and Leber congenital amaurosis: We now show that this shorter PRL transcript is also expressed in RPGR-XLPRA1 (X-Linked Progressive Retinal Atrophy 1, caused by a five-nucleotide deletion in the RPGR exon ORF15) [29, 30] (Fig. 1A) and NPHP5-LCA (Leber Congenital Amaurosis, caused by a single nucleotide insertion in exon 10 of the IQCB1/NPHP5 gene) [31, 32] (Fig. 1B).