RPGR（retinitis pigmentosa GTPase regulator），癌症关联基因，基因ID：6103，该基因编码一个含有六个RCC1样结构域（RLD）的蛋白质，具有高度保守的鸟嘌呤核苷酸交换因子的特征编码的蛋白质存在于高尔基体中，并与rpgrip1相互作用。这种蛋白质定位于杆状感光细胞的外段，对其生存能力至关重要。该基因突变与x连锁视网膜色素变性（xlrp）有关。已经报道了编码该基因不同亚型的多个选择性剪接转录变体，但仅确定了一些基因的全长性质。[由RefSeq提供，2008年12月]This gene encodes a protein with a series of six RCC1-like domains (RLDs)， characteristic of the highly conserved guanine nucleotide exchange factors. The encoded protein is found in the Golgi body and interacts with RPGRIP1. This protein localizes to the outer segment of rod photoreceptors and is essential for their viability. Mutations in this gene have been associated with X-linked retinitis pigmentosa (XLRP). Multiple alternatively spliced transcript variants that encode different isoforms of this gene have been reported， but the full-length natures of only some have been determined. [provided by RefSeq， Dec 2008]。