Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0021051 (immunodeficiency)
 71,517 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Wiskott-Aldrich syndrome (WAS) is an X-linked recessive immunodeficiency disease associated with eczema, hemorrhagic episodes, and recurrent severe infections. The N-terminus of the cytoplasmic WAS protein (WASP) has similarity to WH1 domains, which recognize proline-rich sequences and direct protein localization and formation of multicomponent assemblies. About one-half of the WAS-causing mutations affect the WH1 domain, but this forms only about one-fifth of the length of the protein. To understand the structural and functional effects of WAS-causing mutations within the WH1 domain, the three-dimensional model of the WASP WH1 domain was constructed based on the crystal structures of the Mena and Ev1 EVH1 (WH1) domains. Based on the model, the protein structural effects of the mutations were evaluated and putative ligand-binding regions identified. Mutations in the WASP WH1 domain were found to influence both the function and structure of the WASP. The amino acid substitutions cause general and local structural changes because of steric clashes and changes to the positions of adjacent strands and the fold of the protein. Some mutations alter the electrostatics and interactions with partners and other domains of WASP.
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PMID:Structural basis of Wiskott-Aldrich syndrome causing mutations in the WH1 domain. 1114 Mar 79

Wiskott-Aldrich syndrome (WAS) and X-linked thrombocy topenia (XLT) are caused by mutations of the WAS protein (WASP) gene. The manifestations of the classic WAS phenotype consist of immunodeficiency, eczema and thrombocytopenia. However, thrombocytopenia and small platelets are the only consistent features of WAS and XLT. The exact mechanisms of the development of thrombocytopenia in patients with WAS or XLT are unknown. To date, platelets are the only primary cells in which inducible tyrosine phosphorylation of WASP has been consistently demonstrated. This review focuses on the recent progress in dissecting the causes of thrombocytopenia and the emerging understanding of WASP phosphorylation.
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PMID:Wiskott-Aldrich syndrome protein and platelets. 1121 95

The Wiskott-Aldrich syndrome (WAS) is an X-linked primary immunodeficiency associated with thrombocytopenia, bloody diarrhea, eczema, recurrent infections, and a high incidence of malignancies. X-linked thrombocytopenia (XLT) is a milder form with predominant platelet abnormalities. Both are caused by mutations of the cytoplasmic WAS protein (WASP). To date, mutations of WASP have been identified in over 340 families and consist of missense and nonsense mutations, deletions and insertions, and splice site mutations. There is a striking correlation between phenotype and genotype. The complex gene product of WASP has multiple functional domains that contribute to actin polymerization, cell motility, intracellular signaling, and apoptosis. Understanding the molecular basis of WAS/XLT not only explains the highly variable clinical phenotype, but also affects the medical management of this serious congenital disorder.
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PMID:Molecular biology of the Wiskott-Aldrich syndrome. 1125 21

Wiskott-Aldrich syndrome (WAS), is an X-linked immunodeficiency disease caused by mutations of the WAS protein (WASP) gene, characterized by thrombocytopenia, eczema and recurrent infections. X-linked thrombocytopenia (XLT) is a milder form with only platelet abnormalities. Cumulative mutation data have revealed that WASP genotypes are highly variable among WAS patients. By SSCP analysis, we determined the location of the mutation in 23 WAS patients from 17 unrelated families with variable clinical phenotypes. Direct sequence analysis of genomic DNA showed 9 novel mutations (Q52H, G70W, 393del7, Ex 7 Ex11del, IVS 8+1G-->C, 925delG, 959ins38, 1380del8, and IVS 2+2T-->C) and 8 known mutations distributed throughout the WAS gene. This is the first report of WAS gene mutations from a Latin American country.
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PMID:Wiskott-Aldrich syndrome in Argentina: 17 unique, including nine novel, mutations. 1179 85

Wiskott-Aldrich syndrome (WAS), an X-linked recessive disorder, is characterized by primary progressive T cell immunodeficiency, impaired antipolysaccharide antibody production, eczema, and thrombocytopenia. Stem cell transplantation is the only curative therapy. To evaluate the use of allogeneic peripheral stem cell transplantation (PBSCT) in this group of patients, we performed allogeneic PBSCT in two WAS patients (3 and 12 years old). The conditioning regimen consisted of busulfan 4 mg/kg/day for 4 days, and cyclophosphamide 50 mg/kg/day for 4 days. Graft-versus-host disease prophylaxis was consistent with cyclosporin A and methotrexate. Peripheral blood stem cells were collected from their brother donors (6 and 16 years old) by continuous flow leukapheresis after mobilization with granulocyte-colony-stimulating factor at a dose of 7.5 microg/kg/day for 5 days. Both recipients achieved neutrophils engraftment on days 11 and 12. The first patient achieved platelets engraftment on day 30. The second patient did not have platelet count below 20.0 x 10(9)/l during PBSCT procedure. Both did not develop acute or chronic graft-versus-host disease. At present, they are healthy after PBSCT. The follow up time after transplantation is 1,170 days and 269 days, respectively. Allogeneic PBSCT is economically feasible for WAS. The cost of PBSCT in Thailand is 20 to 30% less than bone marrow and cord blood stem cell transplantation. The cost of the transplant procedure for each patient in Thailand is US $ 12,000. This study is the first report of a successful stem cell transplantation in WAS patients in Thailand.
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PMID:Successful allogeneic peripheral blood stem cell transplantation in Wiskott-Aldrich Syndrome Patients: first report in Thailand. 1182 14

Wiskott-Aldrich syndrome (WAS) is an X-linked immunodeficiency characterized by thrombocytopenia with small platelets, eczema, recurrent infections, autoimmune disorders, IgA nephropathy, and an increased incidence of hematopoietic malignancies. The identification of the responsible gene, WASP (Wiskott-Aldrich Syndrome Protein), revealed clinical heterogeneity of the syndrome, and showed that X-linked thrombocytopenia without, or with only mild immunodeficiency and eczema, is also caused by mutations of WASP. The study of WASP and its mutations demonstrates how a single gene defect can cause multiple and complex clinical symptoms.
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PMID:Wiskott-Aldrich syndrome. 1189 69

The Wiskott-Aldrich syndrome (WAS) is an X-linked disorder characterized by thrombocytopenia, eczema, and immunodeficiency. At present, the only definitive therapy for the disease is allogeneic bone marrow transplantation (BMT). Because of the frequent lack of suitable donors and the potential severe complications associated with BMT, the development of gene-based therapeutic strategies for WAS is highly desirable. To study whether corrective gene transfer into WAS T cells can lead to restoration of the immunologic defects of WAS, a retroviral vector expressing the WAS protein (WASP) gene was used to transduce human T-lymphotropic virus type 1-transformed T-cell lines and primary T lymphocytes from patients with WAS. After transduction, WAS T cells showed levels of WASP expression similar to those found in cells from normal individuals. In addition, the reconstituted WASP interacted in vitro with proteins containing SH3 domain such as Grb2, PLC-gamma1, and Fyn, each of which are connected to signaling pathways linked to the actin cytoskeleton. Furthermore, after CD3 cross-linking, transduced WAS T lines showed improvement of actin polymerization and T-cell receptor/CD3 down-regulation. More importantly, primary WAS T lymphocytes transduced with WASP acquired the ability to proliferate in response to anti-CD3 stimulation. These findings suggest that biologic defects of WAS T cells can be corrected in vitro by retrovirus-mediated gene transfer and pose the basis for future investigation of gene therapy as treatment for WAS.
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PMID:Retrovirus-mediated WASP gene transfer corrects Wiskott-Aldrich syndrome T-cell dysfunction. 1206 37

Wiskott-Aldrich syndrome (WAS) is an X-linked disease characterized by thrombocytopenia, eczema and immunodeficiency of varying severity. The WASP gene, mutations of which are responsible for the phenotype, maps to Xp11.23. We describe here a patient with a large deletion in the Xp11.23 region. The deletion, which totals 15.8 kb, begins downstream of DXS1696 and encompasses 13 kb upstream of WASP and includes the distal and proximal promoters and exons 1-6. Analysis of the 5'-boundary region identified sequences missing in the Human Genome database and, as a result, the normal DNA sequence was revised to include 743 bp of novel sequence (AF466616). The patient's upstream breakpoint was localized to an AluSg element within a highly repetitive DNA region containing other Alu elements. A 26-bp recombinogenic element is located downstream of the 5' breakpoint. A 16-bp sequence just upstream of the 5' breakpoint shares close homology with the sequence that spans the 3' breakpoint in intron 6. A heptanucleotide of unknown origin, CAGGGGG, links the 5' and 3' breakpoints. To our knowledge this is the largest deletion in a WAS patient.
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PMID:An Alu-mediated deletion at Xp11.23 leading to Wiskott-Aldrich syndrome. 1207 25

Health care personnel must be prepared for the threat of bioterrorism. Our objective is to educate primary care providers, obstetricians in particular, in the prevention, diagnosis, and treatment of smallpox. Smallpox poses a particularly serious threat because of its high case-fatality rate in unvaccinated populations (no one younger than 25 years has been vaccinated, and older persons have little remaining residual immunity). Routine nonemergency smallpox vaccination is restricted to laboratory staff working with smallpox-related viruses. Under these circumstances, contraindications to vaccination are pregnancy, immunodeficiency, exfoliative skin conditions (eczema), and allergy to vaccine components. In case of an intentional release of the smallpox virus, those directly exposed and their close contacts must be vaccinated and isolated. Under such emergency circumstances, pregnant women exposed to the variola virus should be vaccinated because of the lethality of the disease during pregnancy. Currently, there is a limited supply of vaccine available.
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PMID:Smallpox and pregnancy: from eradicated disease to bioterrorist threat. 1246 87

The Wiskott-Aldrich Syndrome (WAS) is an X-linked recessive immunodeficiency caused by mutation in the gene encoding WAS protein (WASP). The disease is characterized by eczema, thrombocytopenia and severe immunodeificency and is associated with extensive clinical heterogeneity. Mutation studies indicated that the mutated genotypes are also highly variable. In this study, we performed PCR-direct sequencing analysis of the WAS gene in six unrelated Chinese families. Five novel mutations identified, included two nonsense mutations (506C-->T, 1388-->T), a small insertion (685-686insCGCA) and two single-base deletions (384delT, 984delC). All of the mutations are predicted to lead to premature translational termination of WASP.
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PMID:Identification of five novel WASP mutations in Chinese families with Wiskott-Aldrich syndrome. 1212 97


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