HGSNAT and retinitis pigmentosa 1: Using this approach we previously identified a novel heterozygous deletion of exons 7 and 8 of the Heparan-Alpha-Glucosaminide N-Acetyltransferase (HGSNAT, NM_152419.2, MIM# 616544) gene: c.634-408_820+338delinsAGAATATG, p.(Glu212Glyfs*2) in a simplex RP patient.