Wiskott-Aldrich syndrome: Difference between revisions

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Different types of Von-Willebrand diseases can be differentiated from each other based on the following table:<ref name="pmid258585643">{{cite journal |vauthors=Bodó I, Eikenboom J, Montgomery R, Patzke J, Schneppenheim R, Di Paola J |title=Platelet-dependent von Willebrand factor activity. Nomenclature and methodology: communication from the SSC of the ISTH |journal=J. Thromb. Haemost. |volume=13 |issue=7 |pages=1345–50 |date=July 2015 |pmid=25858564 |pmc=5576173 |doi=10.1111/jth.12964 |url=}}</ref>
!Type of VWD
!
!Type of factor deficiency
!Prevalence
!Inheritance pattern
!Clinical manifestations
!VWF activity
!RIPA
!Factor VIII
|-
|Type 1
|
|Quantitative/ partial
|60-70%
|AD
|
* Bleeding severity mild to severe
|↓
|↓
|↓
|-
| rowspan="4" |Type 2
|2A<ref name="pmid1537829">{{cite journal |vauthors=Lyons SE, Bruck ME, Bowie EJ, Ginsburg D |title=Impaired intracellular transport produced by a subset of type IIA von Willebrand disease mutations |journal=J. Biol. Chem. |volume=267 |issue=7 |pages=4424–30 |date=March 1992 |pmid=1537829 |doi= |url=}}</ref>
|Qualitative
|10%
|AD/AR
|
* Moderate to severe bleeding
|↓
|↓
|N or ↓
|-
|2B
|Qualitative
|5%
|AD
|
* [[Thrombocytopenia]]
* Moderate to severe bleeding
|↓
|↑
|N or↓
|-
|2M
|Qualitative
|<1%
|AD/AR
|
* Moderate to severe bleeding
|↓
|↓
|N or ↓
|-
|2N
|Qualitative
|<1%
|AR
|
* Clinically similar to [[hemophilia A]] with joint, soft tissue, urinary bleeding
|N
|N
|↓
|-
|Type 3
|
|Complete deficiency
|1-2%
|AR
|
* Clinically similar to [[hemophilia A]] with joint and soft tissue bleeding
* Severe [[mucosal bleeding]]
|Absent
|↓
|
Low, 1-10%
|}
For more information on Von Willebrand disease [[ von willebrand disease | click here]]
==Epidemiology and Demographics==
* Incidence of Wiskott-Aldrich syndrome is approximately 1


==Risk Factors==
==Risk Factors==
Line 883: Line 798:
===MRI===
===MRI===
*There are no specific [[Magnetic resonance imaging|MRI]] findings associated with Wiskott-Aldrich syndrome.
*There are no specific [[Magnetic resonance imaging|MRI]] findings associated with Wiskott-Aldrich syndrome.
===Other Imaging Findings===
* There are no other imaging findings associated with Wiscott-Aldrich syndrome.
===Other Diagnostic Studies===
* There are no other diagnostic tests associated with Wiskott-Aldrich syndrome.


==Treatment==
==Treatment==

Revision as of 14:16, 12 October 2018

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GraGrade de

Wiskott-Aldrich syndrome
ICD-10 D82.0
ICD-9 279.12
OMIM 301000
DiseasesDB 14176
MeSH D014923

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Chandrakala Yannam, MD [2]

Associate Editor-In-Chief: Cafer Zorkun, M.D., Ph.D. [3]

Synonyms and keywords: Aldrich syndrome

Overview

Wiskott-Aldrich syndrome (WAS) is a rare X-linked recessive disease characterized by eczema, thrombocytopenia (low platelet counts), immune deficiency, and bloody diarrhea (due to the low platelet counts). It is also sometimes called the eczema-thrombocytopenia-immunodeficiency syndrome in keeping with Aldrich's original description in 1954.[1] The WAS-related disorders of X-linked thrombocytopenia (XLT) and X-linked congenital neutropenia (XLN) may present similar but less severe symptoms and are caused by mutations of the same gene.

Historical Perspective

The syndrome is named after Dr Robert Anderson Aldrich, an American pediatrician who described the disease in a family of Dutch-Americans in 1954, and Dr Alfred Wiskott, a German pediatrician who first noticed the syndrome in 1937.[2] Wiskott described three brothers with a similar disease, whose sisters were unaffected. In 2006 a German research group analysed family members of Wiskott's three cases, and surmised that they probably shared a novel frameshift mutation of the first exon of the WAS gene.[3]

Classification

Jin et al (2004) employ a numerical grading of severity:[4]

Pathophysiology

In the Wiskott–Aldrich syndrome, the platelets are small and do not function properly. They are removed by the spleen, which leads to low platelet counts.

Wiskott–Aldrich syndrome was linked in 1994 to mutations in a gene on the short arm of the X chromosome, which was termed Wiskott-Aldrich syndrome protein (WASp). It was later discovered that the disease X-linked thrombocytopenia (XLT) was also due to WASp mutations, but different ones from those that cause full-blown Wiskott–Aldrich syndrome. Furthermore, the rare disorder X-linked neutropenia has been linked to particular mutations of the WASp gene.

The WASp gene codes for the protein by the same name, which is 502 amino acids long and is mainly expressed in hematopoietic cells (the cells in the bone marrow that develop into blood cells). The main function of WASp is to activate actin polymerization by binding to the Arp2/3 complex. In T-cell, WASp is important because it is known to be activated via T-cell receptor (TCR) signaling pathways to induce cortical actin cytoskeleton rearrangements that are responsible for forming the immunological synapse.

The immune deficiency is caused by decreased antibody production, and an inability for T cells to become polarized [5] (making it a combined immunodeficiency). This leads to increased susceptibility to infections, particularly of the ears and sinuses. T cells are unable to reorganize their actin cytoskeleton. The type of mutation to the WASp gene correlates significantly with the degree of severity: those that led to the production of a truncated protein caused significantly more symptoms than those with a missense mutation but a normal-length WASp. Although autoimmune disease and malignancy occur in both types of mutation, those patients with truncated WASp carry a higher risk.

A defect in CD43 molecule has been found to be associated in patients with Wiskott–Aldrich syndrome.[6]

Causes

In Wiskott–Aldrich syndrome, the platelets are small and do not function properly. They are removed by the spleen, which leads to low platelet counts.

Wiskott–Aldrich syndrome was linked in 1994 to mutations in a gene on the short arm of the X chromosome, which was termed Wiskott-Aldrich syndrome protein (WASp). It was later discovered that the disease X-linked thrombocytopenia (XLT) was also due to WASp mutations, but different ones from those that cause full-blown Wiskott–Aldrich syndrome. Furthermore, the rare disorder X-linked neutropenia has been linked to particular mutations of the WASp gene.

The WASp gene codes for the protein by the same name, which is 502 amino acids long and is mainly expressed in hematopoietic cells (the cells in the bone marrow that develop into blood cells). The main function of WASp is to activate actin polymerization by binding to the Arp2/3 complex. In T-cell, WASp is important because it is known to be activated via T-cell receptor (TCR) signaling pathways to induce cortical actin cytoskeleton rearrangements that are responsible for forming the immunological synapse.

The immune deficiency is caused by decreased antibody production, and an inability for T cells to become polarized [5] (making it a combined immunodeficiency). This leads to increased susceptibility to infections, particularly of the ears and sinuses. T-cells are unable to reorganize their actin cytoskeleton. The type of mutation to the WASp gene correlates significantly with the degree of severity: those that led to the production of a truncated protein caused significantly more symptoms than those with a missense mutation but a normal-length WASp. Although autoimmune disease and malignancy occur in both types of mutation, those patients with truncated WASp carry a higher risk.

A defect in CD43 molecule has been found to be associated in patients with Wiskott–Aldrich syndrome.[6]

Differentiating Wiskott-Aldrich syndrome from Other Diseases

  • Wiskott-Aldrich syndrome must be differentiated from other bleeding disorders. Different causes of bleeding disorders can be differentiated based on their clinical manifestation and laboratory findings. These features have discussed in the below table:
Category Sub-category Diseases History Clinical manifestation Laboratory testing Comments
Mucosal bleeding Petechia|Petechiae Ecchymoses Menorrhagia Hematoma Hemarthrosis Platelet count Bleeding time (BT) Prothrombin time (PT) Activated partial thromboplastin time (aPTT) Thrombin time (TT)
Platelet disorders Thrombocytopenia Infection-Induced thrombocytopenia[7][8][9]
  • History of prior infection
+ + + + + + Normal Normal Normal -
Medications-Induced thrombocytopenia [10][11] + + + + + + Normal Normal Normal Most important par of treatment is discontinuing of the medication.
Heparin-Induced thrombocytopenia[12] + + + + + + Normal Normal For more information click here: Heparin-induced thrombocytopenia.
Immune Thrombocytopenic Purpura (ITP)[13] + + + + + + Normal Normal Normal -
Inherited Thrombocytopenia[14][15]
  • Family history
+ + + + + + Normal Normal Normal -
Thrombotic Thrombocytopenic Purpura (TTP)[16][17] History of: + + + + + + Normal Normal Normal -
Hemolytic Uremic Syndrome[18][19] History of:
  • Infections
+ + + + + + Normal Normal Normal -
Thromobcytosis Iron deficiency anemia

Inflammatory diseases

Splenectomy

Essential thrombocytosis

- +/- +/- Normal/↑ Normal Normal Normal -
Qualitative Disorders of Platelet Function Inherited Disorders of Platelet Function Glanzmann’s thrombasthenia
  • Family history
+ + + + - Rare Normal/↓ Normal Normal Normal
  • AR inheritance
  • Absence of the platelet Gp IIb/IIIa receptor/
  • Diminished for GP 2B-3A on flow cytometry
Bernard-Soulier syndrome[20][21]
  • Family history
+ + + + - - Normal/↓ Normal Normal Normal
  • AR inheritance
  • Absence of the platelet Gp Ib-IX-V receptor
  • On PBS: giant platelets
  • Ristocetin - no aggregation
Wiskott-Aldrich syndrome[22][23][24][25]
  • Family history
+ + + + - - Normal/↓ Normal Normal Normal
  • Anti-WASp antibody can be used to detect presence or absence of WAS protein
  • In Wiskott–Aldrich syndrome, the platelets are small and do not function properly. They are removed by the spleen, which leads to low platelet counts.
Platelet storage pool disorder (SPD):
  • Positive family history
  • Hairy-cell leukemia
  • Cardiovascular bypass
+ + + + - - Normal/↓ Normal Normal Normal
  • AD inheritance
  • Abnormalities of platelet granule formation
Acquired Disorders of Platelet Function + + + + +/- +/- Normal/↓ Normal Normal Normal -
Von Willebrand Disease [26][26][27][28][29] + + + + +/- +/- Normal Normal See the table below for the details about types.
Vessel wall disorders Metabolic and Inflammatory Disorders
  • History of the underlying disease.
- + + +/- - - Normal ↑/Normal Normal Normal Normal -
Inherited Disorders of the Vessel Wall
  • Positive family history
- + + +/- - - Normal ↑/Normal Normal Normal Normal -
Coagulation factor disorders[30][31][32][32][33][34][35][36][37][38][39] Fibrinogen deficiency[40] Different types of the fibrinogen disorders: - - + + +/- + Normal
  • Impaired fibrin cross linking or clot dissolution.
  • The severity of bleeding in patients with fibrinogen disorders can be mild or severe, with higher bleeding risk in those with afibrinogenemia or lower levels of functional fibrinogen. The age of onset is also variable, with earlier onset in those with more severe deficiency.
Prothrombin deficiency + + + + + Normal Normal -
Factor V deficiency _ + + + + Normal Normal The severity of bleeding is only partly related to the degree of factor V deficiency. Some patients with undetectable plasma levels of factor V experience only relatively mild bleeding.
Factor VII deficiency + + + Normal Normal Normal Thrombosis occurs in inherited factor VII deficiency most cases are associated with the administration of factor VII replacement therapy
Factor X deficiency
  • Prolonged bleeding following circumcision
+ + + + + Normal Normal Normal -
Factor XII deficiency
  • Majority,asymptomatic
  • Recurrent miscarriages
  • Painful leg ulcers
_ _ _ _ _ Normal Normal Normal Normal
High molecular weight kininogen (HMWK) deficiency
  • Possibility of positive family history of bleeding
_ _ _ _ _ Normal Normal Normal Normal
Prekallikrein deficiency
  • Possibility of positive family history of bleeding
_ _ _ _ _ Normal Normal Normal Normal
Factor XIII deficiency Types:
  • Sub unit A mutation disease (more common)
  • Sub unit B mutation disease
  • Possibility of positive family history of bleeding
-/+ -/+ -/+ -/+ -/+ -/+ Normal Normal Normal/↑ Normal Normal
  • Impaired fibrin cross linking or clot dissolution
  • The severity of factor XIII deficiency bleeds can be different in different patients
Hemophilia[41][42][43][44][45][46] Type A deficiency - - - + + + Normal Normal Normal Normal -
Type B deficiency - - - + + + Normal Normal Normal Normal -
Type C deficiency
  • Family history
  • Bleeding after surgery or injury
- - - + Rare Rare Normal Normal Normal Normal -
Rare diseases Disseminated Intravascular Coagulation[47] + + + + + + Normal -
Vitamin K Deficiency[48] + - + + + + Normal Normal or mildly prolonged Normal -

Risk Factors

  • Positive family history of Wiskott-Aldrich syndrome, can be consider as a risk factor.

Screening

  • Flow cytometry:
    • Anti-WASp antibody can be used to detect presence or absence of WAS protein. However, flow cytometry may not detect expression of mutated, reduced or poor WASp.[49]
  • Identification of carriers: Known female carriers can be identified by using DNA mutation analysis of WAS gene.
  • Prenatal diagnosis: DNA analysis from chorionic villus sampling can be performed.[50]

Natural History, Complications, and Prognosis

Diagnosis

Diagnostic Study of Choice

History and Symptoms

  • Patients with Wiskott-Aldrich syndrome have

Physical Examination

Laboratory Findings

Electrocardiogram

  • There are no specific electrocardiogram findings associated with Wiskott-Aldrich syndrome.

X-ray

  • There are no specific x-ray findings associated with Wiskott-Aldrich syndrome. However, a chest x-ray may be helpful in the diagnosis of complications, which include pneumonia.

Echocardiography or Ultrasound

CT scan

MRI

  • There are no specific MRI findings associated with Wiskott-Aldrich syndrome.

Treatment

Medical Therapy

Surgery

Primary Prevention

Secondary Prevention

References

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  2. Wiskott, A (1937). "Familiärer, angeborener Morbus Werlhofii? ("Familial congenital Werlhof's disease?")". Montsschr Kinderheilkd. 68: 212–16.
  3. Binder V, Albert MH, Kabus M, Bertone M, Meindl A, Belohradsky BH (2006). "The genotype of the original Wiskott phenotype". N. Engl. J. Med. 355 (17): 1790–3. doi:10.1056/NEJMoa062520. PMID 17065640.
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  5. 5.0 5.1 "Wiskott-Aldrich Syndrome: Immunodeficiency Disorders: Merck Manual Professional". Retrieved 2008-03-01.
  6. 6.0 6.1 PMID 1683685 (PMID 1683685)
    Citation will be completed automatically in a few minutes. Jump the queue or expand by hand
  7. Neunert C, Lim W, Crowther M, Cohen A, Solberg L, Crowther MA (April 2011). "The American Society of Hematology 2011 evidence-based practice guideline for immune thrombocytopenia". Blood. 117 (16): 4190–207. doi:10.1182/blood-2010-08-302984. PMID 21325604.
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