Scaffold Attachment Factor A (SAFA)
SAF-A
SAF-A has been implicated in chromatin organization, owing to its high specificity for scaffold-associated region (SAR)-DNA, in transcriptional regulation, e.g. of hormone-regulated genes, owing to its functional interaction with steroid receptors, and in RNA processing, owing to its interaction with RNA and heterogeneous nuclear ribonucleoprotein (hnRNP) particles. After near complete removal of DNA and associated chromatin proteins such as macroH2A, SAF-A remains with the "nuclear matrix", still highlighting the former position of inactive X chromosomes. Interestingly, the enrichment of SAF-A in the inactive X chromosome depends on the RNA binding domain of the protein, the RGG box, raising the possibility that interaction of SAF-A with XIST RNA may contribute to the silencing of X-linked genes by local changes in nuclear architecture.
Organism species: Chicken (Gallus)
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