Human Molecular Genetics, Vol 8, 277-290, Copyright © 1999 by Oxford University Press
C Rinderle, HM Christensen, S Schweiger, H Lehrach and ML Yaspo
The gene responsible for autoimmune polyendocrino-pathy candidiasis
ectodermal dystrophy (APECED) recently has been positionally cloned to
21q22.3. This novel gene, AIRE, encodes for a predicted 57.7 kDa protein
featuring two PHD-type zinc fingers shared by other proteins involved in
chromatin-mediated tran-scriptional regulation. APECED is an autosomal
recessive condition characterized by multiple polyendocrinopathies, and the
typical triad of APECED symptoms includes hypoparathyroidism, primary
adrenocortical failure and chronic mucocutaneous candidiasis. The aetiology
of APECED is linked directly to mutations within the coding region of AIRE.
These mutations are predicted to lead to truncated forms of the protein
lacking at least one of the PHD zinc fingers. In this study, we have
investigated the sub-cellular localization of AIRE expressed transiently in
COS cells and fibroblasts. We found that AIRE has a dual nuclear and
cytoplasmic localization. The wild-type protein is directed to speckled
domains in the nucleus and also shows co-localization with cytoskeletal
filaments. N-terminal AIRE fragments deleted for the PHD domain show
altered nuclear localization, suggesting that the APECED mutations may
elicit their primary effects in the nucleus.
ARTICLES
AIRE encodes a nuclear protein co-localizing with cytoskeletal filaments: altered sub-cellular distribution of mutants lacking the PHD zinc fingers
Max Planck Institute for Molecular Genetics, Ihnestrasse 73, D-14195 Berlin, Germany.
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