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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Functional correction of FA-C cells with FANCC suppresses the expression of interferon gamma-inducible genes.

Because hematopoietic cells derived from Fanconi anemia (FA) patients of the C-complementation group (FA-C) are hypersensitive to the inhibitory effects of interferon gamma (IFNgamma), the products of certain IFNgamma-inducible genes known to influence hematopoietic cell survival were quantified. High constitutive expression of the IFNgamma-inducible genes, IFN-stimulated gene factor 3 gamma subunit (ISGF3gamma), IFN regulatory factor-1 ( IRF-1), and the cyclin-dependent kinase inhibitor p21(WAF1) was found in FANCC mutant B lymphoblasts, low-density bone marrow cells, and murine embryonic fibroblasts. Paradoxically, these cells do not activate signal transducer and activator of transcription (STAT) 1 properly. In an attempt to clarify mechanisms by which FA-C cells overexpress IFNgamma-inducible genes in the face of defective STAT1 phosphorylation, it was reasoned that decreased levels of activated STAT1 might result in reduced expression of a hematopoietic IFNgamma-responsive protein that normally modulates expression of other IFNgamma-responsive genes. Levels of the IFNgamma-inducible factor IFN consensus sequence binding protein ( ICSBP), a negative trans-acting regulator of some IFNgamma-inducible genes, were quantified. ICSBP levels were reduced in FA-C B lymphoblasts and MEFs. However, enforced expression of ICSBP failed to down-regulate IRF-1, ISGF3gamma, and p21(WAF1). Thus, the FANCC protein functions to modulate expression of a family of genes that in normal cells are inducible only by specific environmental cues for apoptosis or mitogenic inhibition, but it does so independently of the classic IFN-STAT1 pathway and is not the direct result of reduced ICSBP expression.[1]


  1. Functional correction of FA-C cells with FANCC suppresses the expression of interferon gamma-inducible genes. Fagerlie, S.R., Diaz, J., Christianson, T.A., McCartan, K., Keeble, W., Faulkner, G.R., Bagby, G.C. Blood (2001) [Pubmed]
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