Any retinitis pigmentosa in which the cause of the disease is a mutation in the CNGB1 gene. The disease is retinitis pigmentosa 45 (Monarch Disease Ontology entry MONDO_0013413). Also known as: CNGB1 retinitis pigmentosa, RP45, retinitis pigmentosa caused by mutation in CNGB1, retinitis pigmentosa type 45.