A novel mutation in the human androgen receptor suggests a regulatory role for the hinge region in amino-terminal and carboxy-terminal interactions.
BACKGROUND
The androgen insensitivity syndrome (AIS) is caused by molecular defects in the androgen receptor (AR). Clinically, the partial AIS has a variable phenotype. Many mechanisms explain the phenotype in the AIS. A crucial step in AR action is the interaction of the N and C termini.


OBJECTIVE
The role of the hinge region of the AR is not as well understood as other parts of the receptor. We aim to study the role of this region in the N/C-termini interaction.


METHODS
We report a patient with severe undermasculinization and poor response to exogenous androgens. Androgen binding was performed, and the AR gene was sequenced. The mutation was recreated and transfected in COS-1 cells. Transactivation was studied. N/C-termini interaction was studied using a mammalian two-hybrid assay. A nuclear localization study was performed.


RESULTS
Androgen binding was normal, and a novel mutation (Arg629Trp) in the AR hinge region was identified. Mutant AR transactivation was 40% higher compared with wild type (WT). A 3-fold increase in transcription occurred when both WT N and C-terminal domains were cotransfected; no response occurred when the mutated region of the AR was included (P < 0.001). Cells with mutant AR showed a comparable nuclear localization to the WT AR.


CONCLUSIONS
A mutation in the hinge region impaired N/C-domain interaction in the presence of normal AR binding and nuclear localization. It resulted in severe undermasculinization at birth and resistance to androgens. The findings confirm a unique regulatory role for the hinge region in AR function.
Deeb
A
A
University Department of Pediatrics, Addenbrooke's Hospital, Cambridge CB2 2QQ, UK.
Jääskeläinen
J
J
Dattani
M
M
Whitaker
H C
HC
Costigan
C
C
Hughes
I A
IA
D000328:Adult; D013734:Androgen-Insensitivity Syndrome / Q000175:diagnosis / Q000235:genetics*; D000818:Animals; D019556:COS Cells; D002522:Chlorocebus aethiops; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D017354:Point Mutation / Q000502:physiology; D011485:Protein Binding / Q000235:genetics; D017434:Protein Structure, Tertiary; D011944:Receptors, Androgen / Q000737:chemistry* / Q000235:genetics* / Q000378:metabolism / Q000502:physiology; D015533:Transcriptional Activation / Q000235:genetics / Q000502:physiology*; D014162:Transfection
D011944:Receptors, Androgen