In 4 Saudi Arabian sibs with nonsyndromic retinitis pigmentosa (RP) mapping to chromosome 3p12-q13, Aldahmesh et al. (2009) identified homozygosity for a missense mutation in the ARL6 gene (608845.0006). Thorough examination of the affected sibs by Safieh et ... In 4 Saudi Arabian sibs with nonsyndromic retinitis pigmentosa (RP) mapping to chromosome 3p12-q13, Aldahmesh et al. (2009) identified homozygosity for a missense mutation in the ARL6 gene (608845.0006). Thorough examination of the affected sibs by Safieh et al. (2010) revealed no recognizable primary or secondary features of BBS other than retinitis pigmentosa. Analysis of more than 50 additional RP patients yielded no similar cases, suggesting that the contribution of ARL6 to nonsyndromic RP is infrequent.