該基因編碼一個含有六個RCC1樣結構域（RLD）的蛋白質，具有高度保守的鳥嘌呤核苷酸交換因子的特征編碼的蛋白質存在于高爾基體中，并與rpgrip1相互作用。這種蛋白質定位于桿狀感光細胞的外段，對其生存能力至關重要。該基因突變與x連鎖視網膜色素變性（xlrp）有關。已經報道了編碼該基因不同亞型的多個選擇性剪接轉錄變體，但僅確定了一些基因的全長性質。
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.