Abstract:
:Hepatocyte nuclear factor-1alpha (HNF-1alpha) is a homeodomain-containing transcription factor regulating the expression of liver and pancreas-specific genes. Mutations in the HNF-1alpha-encoding gene TCF1 cause maturity-onset diabetes of the young, type 3 (MODY3). These mutations may affect nuclear import or reduce the ability of HNF-1alpha to stimulate transcription. We performed a functional dissection of HNF-1alpha, attempting both to define its nuclear localization signals (NLSs) and to identify important elements of the Cterminal transactivation domain. Three HNF-1alpha regions, A (amino acids 158-171), B (197-205), and C (271-282), highly similar to consensus NLSs, were studied by immunolocalization in HeLa cells. Region B could be identified as the most critical for correct nuclear localization. Deletion of two subregions (amino acids 398-470 and 544-631, respectively) in the HNF-1alpha C-terminal transactivation domain, resulted in the greatest reduction in stimulation of transcription compared to wild-type protein. However, this domain probably consists of many elements that work in concert to give the full transactivation potential of the protein.
journal_name
DNA Cell Bioljournal_title
DNA and cell biologyauthors
Bjørkhaug L,Bratland A,Njølstad PR,Molven Adoi
10.1089/dna.2005.24.661keywords:
subject
Has Abstractpub_date
2005-11-01 00:00:00pages
661-9issue
11eissn
1044-5498issn
1557-7430journal_volume
24pub_type
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