Abstract:
:Mutations in the DAX-1 [dosage-sensitive sex reversal-adrenal hypoplasia congenita (AHC) critical region on the X chromosome; NR0B1] gene cause X-linked AHC associated with hypogonadotropic hypogonadism. DAX-1 encodes an unusual orphan member of the nuclear hormone receptor superfamily, acting as a transcriptional repressor of genes involved in the steroidogenic pathway. All DAX-1 mutations found in AHC patients alter the protein C terminus, which shares similarity to the ligand binding domain of nuclear hormone receptors and bears transcriptional repressor activity. This property is invariably impaired in DAX-1 AHC mutants. Here we show that the localization of DAX-1 AHC mutant proteins is drastically shifted toward the cytoplasm, even if their nuclear localization signal, which resides in the N terminal of the protein, is intact. Cytoplasmic localization of DAX-1 AHC mutants correlates with an impairment in their transcriptional repression activity. These results reveal a critical role of an intact C terminus in determining DAX-1 subcellular localization and constitute an important example of a defect in human organogenesis caused by impaired nuclear localization of a transcription factor.
journal_name
Proc Natl Acad Sci U S Aauthors
Lehmann SG,Lalli E,Sassone-Corsi Pdoi
10.1073/pnas.122044099keywords:
subject
Has Abstractpub_date
2002-06-11 00:00:00pages
8225-30issue
12eissn
0027-8424issn
1091-6490pii
122044099journal_volume
99pub_type
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