Abstract:
:Viral infection induces type I interferons (IFN-alpha and IFN-beta) that recruit unexposed cells in a self-amplifying response. We report that the transcription factor MafB thwarts auto-amplification by a metastable switch activity. MafB acted as a weak positive basal regulator of transcription at the IFNB1 promoter through activity at transcription factor AP-1-like sites. Interferon elicitors recruited the transcription factor IRF3 to the promoter, whereupon MafB acted as a transcriptional antagonist, impairing the interaction of coactivators with IRF3. Mathematical modeling supported the view that prepositioning of MafB on the promoter allows the system to respond rapidly to fluctuations in IRF3 activity. Higher expression of MafB in human pancreatic islet beta cells might increase cellular vulnerability to viral infections associated with the etiology of type 1 diabetes.
journal_name
Nat Immunoljournal_title
Nature immunologyauthors
Kim H,Seed Bdoi
10.1038/ni.1897subject
Has Abstractpub_date
2010-08-01 00:00:00pages
743-50issue
8eissn
1529-2908issn
1529-2916pii
ni.1897journal_volume
11pub_type
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