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Immunodeficiency 73b with defective neutrophil chemotaxis and lymphopenia(IMD73B)

MedGen UID:
1740566
Concept ID:
C5436549
Disease or Syndrome
Synonyms: IMD73B; IMMUNODEFICIENCY 73B WITH DEFECTIVE NEUTROPHIL CHEMOTAXIS AND LYMPHOPENIA
 
Gene (location): RAC2 (22q13.1)
 
Monarch Initiative: MONDO:0033554
OMIM®: 618986

Definition

Immunodeficiency-73B with defective neutrophil chemotaxis (IMD73B) is an autosomal dominant immunologic disorder characterized by onset of recurrent infections in infancy or early childhood. Affected individuals develop respiratory infections, cellulitis, and severe invasive infections or sepsis; organisms include bacteria such as Staphylococcus, as well as viruses, fungi, and mycobacterial species. Laboratory studies show variable abnormalities, including B- and T-cell lymphopenia, decreased immunoglobulin subsets, decreased TRECs and dysfunctional T cells, decreased NK cells, neutropenia, and impaired neutrophil chemotaxis. Hematopoietic stem cell transplantation is curative (summary by Hsu et al., 2019; review by Lougaris et al., 2020). In a review of autosomal forms of chronic granulomatous disease (see 306400 for genetic heterogeneity of CGD), Roos et al. (2021) noted that patients with RAC2 mutations may manifest CGD-like symptoms due to defects in neutrophil NADPH oxidase activity. [from OMIM]

Clinical features

From HPO
Hepatosplenomegaly
MedGen UID:
9225
Concept ID:
C0019214
Sign or Symptom
Simultaneous enlargement of the liver and spleen.
Pancytopenia
MedGen UID:
18281
Concept ID:
C0030312
Disease or Syndrome
An abnormal reduction in numbers of all blood cell types (red blood cells, white blood cells, and platelets).
Cellulitis
MedGen UID:
40174
Concept ID:
C0007642
Disease or Syndrome
A bacterial infection and inflammation of the skin und subcutaneous tissues.
Bronchiectasis
MedGen UID:
14234
Concept ID:
C0006267
Disease or Syndrome
Persistent abnormal dilatation of the bronchi owing to localized and irreversible destruction and widening of the large airways.
Chronic bronchitis
MedGen UID:
3084
Concept ID:
C0008677
Disease or Syndrome
Chronic inflammation of the bronchi.
Chronic obstructive pulmonary disease
MedGen UID:
9818
Concept ID:
C0024117
Disease or Syndrome
Chronic obstructive pulmonary disease (COPD) is a common, complex disorder associated with substantial morbidity and mortality. COPD is defined by irreversible airflow obstruction due to chronic bronchitis, emphysema, and/or small airways disease. Airflow obstruction is typically determined by reductions in quantitative spirometric indices, including forced expiratory volume at 1 second (FEV1) and the ratio of FEV1 to forced vital capacity (FVC) (Silverman et al., 2002; Celedon et al., 2004).
Pulmonary fibrosis
MedGen UID:
11028
Concept ID:
C0034069
Disease or Syndrome
Replacement of normal lung tissues by fibroblasts and collagen.
Recurrent sinusitis
MedGen UID:
107919
Concept ID:
C0581354
Disease or Syndrome
A recurrent form of sinusitis.
Recurrent pneumonia
MedGen UID:
195802
Concept ID:
C0694550
Disease or Syndrome
An increased susceptibility to pneumonia as manifested by a history of recurrent episodes of pneumonia.
Recurrent lower respiratory tract infections
MedGen UID:
756211
Concept ID:
C3163798
Disease or Syndrome
An increased susceptibility to lower respiratory tract infections as manifested by a history of recurrent lower respiratory tract infections.
Recurrent respiratory infections
MedGen UID:
812812
Concept ID:
C3806482
Finding
An increased susceptibility to respiratory infections as manifested by a history of recurrent respiratory infections.
Leukopenia
MedGen UID:
6073
Concept ID:
C0023530
Disease or Syndrome
An abnormal decreased number of leukocytes in the blood.
Lymphadenitis
MedGen UID:
7410
Concept ID:
C0024205
Disease or Syndrome
Inflammation of a lymph node.
Lymphopenia
MedGen UID:
7418
Concept ID:
C0024312
Disease or Syndrome
A reduced number of lymphocytes in the blood.
Sepsis
MedGen UID:
48626
Concept ID:
C0036690
Disease or Syndrome
Systemic inflammatory response to infection.
Monocytopenia
MedGen UID:
507013
Concept ID:
C0427544
Finding
An decreased number of circulating monocytes.
Generalized lymphadenopathy
MedGen UID:
96909
Concept ID:
C0476486
Finding
A generalized form of lymphadenopathy.
Recurrent otitis media
MedGen UID:
155436
Concept ID:
C0747085
Disease or Syndrome
Increased susceptibility to otitis media, as manifested by recurrent episodes of otitis media.
Neutropenia
MedGen UID:
163121
Concept ID:
C0853697
Finding
An abnormally low number of neutrophils in the peripheral blood.
B lymphocytopenia
MedGen UID:
340780
Concept ID:
C1855067
Finding
An abnormal decrease from the normal count of B cells.
T lymphocytopenia
MedGen UID:
419385
Concept ID:
C2931322
Finding
An abnormally low count of T cells.
Impaired neutrophil chemotaxis
MedGen UID:
895851
Concept ID:
C4280709
Cell or Molecular Dysfunction
An impairment of the migration of neutrophils towards chemoattractants as part of the innate immune response
Abnormally low T cell receptor excision circle level
MedGen UID:
1611921
Concept ID:
C4531052
Finding
Reduced level of T cell receptor excision circle (TRECs) as measured by the TREC assay. Late in maturation, 70% of thymocytes that will ultimately express alpha/beta-T cell receptors form a circular DNA TREC from the excised TCRdelta gene that lies within the TCRalpha genetic locus. The circles are stable but do not increase following cell division and, therefore, become diluted as T cells proliferate. A quantitative polymerase chain reaction (PCR) reaction across the joint of the circular DNA provides the TREC copy number, a marker of newly-formed, antigenically-naïve thymic emigrant T cells.
Decreased lymphocyte proliferation in response to anti-CD3
MedGen UID:
1614554
Concept ID:
C4531165
Finding
A decreased proliferative response of lymphocytes in vitro or in vivo, when stimulated with an anti-CD3 antibody against the T-cell co-receptor, CD3.
Severe varicella zoster infection
MedGen UID:
1688785
Concept ID:
C5139168
Disease or Syndrome
An unusually severe form of varicella zoster virus (VZV) infection. In the majority of the cases, especially in children, varicella is a very mild infection characterized by skin lesions, low grade fever and malaise. Severe infection is characterized by manifestations including VZV pneumonia, hepatitis, meningitis, and disseminated varicella.
Partial absence of specific antibody response to Haemophilus influenzae type b (Hib) vaccine
MedGen UID:
1706490
Concept ID:
C5139468
Finding
A reduced ability to synthesize postvaccination antibodies against a Haemophilus influenzae type b (Hib) antigen, as measured by antibody titer determination following vaccination.
Decreased circulating IgG level
MedGen UID:
1720114
Concept ID:
C5234937
Finding
An abnormally decreased level of immunoglobulin G (IgG) in blood.

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