A lack of MHC-II expression results in a severe immunodeficiency syndrome called MHC-II deficiency, or the bare lymphocyte syndrome (BLS; MIM 209920). At least 4 complementation groups have been identified in B-cell lines established from patients with BLS. The molecular defects in complementation groups B, C, and D all lead to a deficiency in RFX, a nuclear protein complex that binds to the Xbox of MHC-II promoters. The lack of RFX binding activity in complementation group C results from mutations in the RFX5 gene encoding the 75-kD subunit of RFX (Steimle et al., 1995). RFX5 is the fifth member of the growing family of DNA-binding proteins sharing a novel and highly characteristic DNA-binding domain called the RFX motif. Multiple alternatively spliced transcript variants have been found but the full-length natures of only two have been determined.[2]
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Moreno CS, Rogers EM, Brown JA, Boss JM (Jun 1997). "Regulatory factor X, a bare lymphocyte syndrome transcription factor, is a multimeric phosphoprotein complex". Journal of Immunology. 158 (12): 5841–8. PMID9190936.
Suzuki Y, Yoshitomo-Nakagawa K, Maruyama K, Suyama A, Sugano S (Oct 1997). "Construction and characterization of a full length-enriched and a 5'-end-enriched cDNA library". Gene. 200 (1–2): 149–56. doi:10.1016/S0378-1119(97)00411-3. PMID9373149.
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Nagarajan UM, Louis-Plence P, DeSandro A, Nilsen R, Bushey A, Boss JM (Feb 1999). "RFX-B is the gene responsible for the most common cause of the bare lymphocyte syndrome, an MHC class II immunodeficiency". Immunity. 10 (2): 153–62. doi:10.1016/S1074-7613(00)80016-3. PMID10072068.
Peijnenburg A, Van Eggermond MC, Van den Berg R, Sanal O, Vossen JM, Van den Elsen PJ (Apr 1999). "Molecular analysis of an MHC class II deficiency patient reveals a novel mutation in the RFX5 gene". Immunogenetics. 49 (4): 338–45. doi:10.1007/s002510050501. PMID10079298.
Sengupta PK, Fargo J, Smith BD (Jul 2002). "The RFX family interacts at the collagen (COL1A2) start site and represses transcription". The Journal of Biological Chemistry. 277 (28): 24926–37. doi:10.1074/jbc.M111712200. PMID11986307.
Nekrep N, Jabrane-Ferrat N, Wolf HM, Eibl MM, Geyer M, Peterlin BM (Nov 2002). "Mutation in a winged-helix DNA-binding motif causes atypical bare lymphocyte syndrome". Nature Immunology. 3 (11): 1075–81. doi:10.1038/ni840. PMID12368908.
Xu Y, Wang L, Buttice G, Sengupta PK, Smith BD (Dec 2003). "Interferon gamma repression of collagen (COL1A2) transcription is mediated by the RFX5 complex". The Journal of Biological Chemistry. 278 (49): 49134–44. doi:10.1074/jbc.M309003200. PMID12968017.
Nagarajan UM, Long AB, Harreman MT, Corbett AH, Boss JM (Jul 2004). "A hierarchy of nuclear localization signals governs the import of the regulatory factor X complex subunits and MHC class II expression". Journal of Immunology. 173 (1): 410–9. doi:10.4049/jimmunol.173.1.410. PMID15210800.
Hjerrild M, Stensballe A, Rasmussen TE, Kofoed CB, Blom N, Sicheritz-Ponten T, Larsen MR, Brunak S, Jensen ON, Gammeltoft S (2004). "Identification of phosphorylation sites in protein kinase A substrates using artificial neural networks and mass spectrometry". Journal of Proteome Research. 3 (3): 426–33. doi:10.1021/pr0341033. PMID15253423.
