Hereditary degenerations and dysfunctions of the retina are an extreme
ly heterogeneous group of diseases. This summary deals with recent adv
ances in the molecular genetics of a subset of those disorders, namely
, those encompassed under the diagnosis 'retinitis pigmentosa'. Over 2
0 loci where mutations cause retinitis pigmentosa have been mapped; th
e review focuses on the seven retinitis pigmentosa loci that have been
identified.