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JOURNAL ARTICLE
RESEARCH SUPPORT, N.I.H., EXTRAMURAL
RESEARCH SUPPORT, NON-U.S. GOV'T
RESEARCH SUPPORT, U.S. GOV'T, P.H.S.
REVIEW
Structure and function of the Wiskott-Aldrich syndrome protein.
Current Opinion in Hematology 2005 July
PURPOSE OF REVIEW: Mutations of the Wiskott-Aldrich syndrome protein can result in highly variable clinical symptoms that affect the hematopoietic/immunologic system. The responsible gene, WASP, has multiple domains, each with unique functions that were only recently fully recognized.
RECENT FINDINGS: Two new comprehensive studies of patients with mutations of the Wiskott-Aldrich syndrome protein unequivocally demonstrated a strong phenotype-genotype correlation; the most predictive variable was the presence or absence of the Wiskott-Aldrich syndrome protein in the lymphoid cells from patients with X-linked thrombocytopenia or Wiskott-Aldrich syndrome, respectively. A third clinical study revealed a high rate (>70%) of autoimmune disorders in patients with classic Wiskott-Aldrich syndrome, possibly caused by immune dysregulation involving both T and B cell defects. In addition, the Wiskott-Aldrich syndrome protein is required for natural killer cell function by participating in the formation of immunologic synapses and facilitating the nuclear translocation of nuclear factor for activated T cell and nuclear factor-kappaB. Finally, the Wiskott-Aldrich syndrome protein was shown to play an important role in lymphoid development and in the maturation and function of myelomonocytic cells.
SUMMARY: The progress made in dissecting the functions of the Wiskott-Aldrich syndrome protein has direct implications for our understanding of the distinct clinical phenotypes (Wiskott-Aldrich syndrome/X-linked thrombocytopenia; intermittent thrombocytopenia; congenital neutropenia), for making diagnostic and prognostic decisions, and for the selection of therapeutic strategies--from conservative symptomatic treatment to curative hematopoietic stem cell transplantation, or, in the future, gene therapy.
RECENT FINDINGS: Two new comprehensive studies of patients with mutations of the Wiskott-Aldrich syndrome protein unequivocally demonstrated a strong phenotype-genotype correlation; the most predictive variable was the presence or absence of the Wiskott-Aldrich syndrome protein in the lymphoid cells from patients with X-linked thrombocytopenia or Wiskott-Aldrich syndrome, respectively. A third clinical study revealed a high rate (>70%) of autoimmune disorders in patients with classic Wiskott-Aldrich syndrome, possibly caused by immune dysregulation involving both T and B cell defects. In addition, the Wiskott-Aldrich syndrome protein is required for natural killer cell function by participating in the formation of immunologic synapses and facilitating the nuclear translocation of nuclear factor for activated T cell and nuclear factor-kappaB. Finally, the Wiskott-Aldrich syndrome protein was shown to play an important role in lymphoid development and in the maturation and function of myelomonocytic cells.
SUMMARY: The progress made in dissecting the functions of the Wiskott-Aldrich syndrome protein has direct implications for our understanding of the distinct clinical phenotypes (Wiskott-Aldrich syndrome/X-linked thrombocytopenia; intermittent thrombocytopenia; congenital neutropenia), for making diagnostic and prognostic decisions, and for the selection of therapeutic strategies--from conservative symptomatic treatment to curative hematopoietic stem cell transplantation, or, in the future, gene therapy.
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