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Template:Infobox gene Retinitis pigmentosa 9 (autosomal dominant), also known as RP9 or PAP-1, is a protein which in humans is encoded by the RP9 gene.[1]


The removal of introns from nuclear pre-mRNAs occurs on a complex called a spliceosome, which is made up of 4 small nuclear ribonucleoprotein (snRNP) particles and an undefined number of transiently associated splicing factors. The exact role of PAP-1 in splicing is not fully understood, but it is thought that PAP-1 localizes in nuclear speckles containing the splicing factor SC35 and interacts directly with another splicing factor, U2AF35.[2]

Clinical significance

Mutations in PAP1 underlie autosomal dominant retinitis pigmentosa mapped to the RP9 gene locus.[3]


RP9 has been shown to interact with U2 small nuclear RNA auxiliary factor 1.[2]


  1. "Entrez Gene: RP9 retinitis pigmentosa 9 (autosomal dominant)". 
  2. 2.0 2.1 Maita H, Kitaura H, Keen TJ, Inglehearn CF, Ariga H, Iguchi-Ariga SM (November 2004). "PAP-1, the mutated gene underlying the RP9 form of dominant retinitis pigmentosa, is a splicing factor". Exp. Cell Res. 300 (2): 283–96. PMID 15474994. doi:10.1016/j.yexcr.2004.07.029. 
  3. Keen TJ, Hims MM, McKie AB, Moore AT, Doran RM, Mackey DA, Mansfield DC, Mueller RF, Bhattacharya SS, Bird AC, Markham AF, Inglehearn CF (April 2002). "Mutations in a protein target of the Pim-1 kinase associated with the RP9 form of autosomal dominant retinitis pigmentosa". Eur. J. Hum. Genet. 10 (4): 245–9. PMID 12032732. doi:10.1038/sj.ejhg.5200797. 

Further reading