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Chronic granulomatous disease

chronic granulomatous disease, chronic granulomatous disease life expectancy
Chronic granulomatous disease CGD also known as Bridges–Good syndrome, chronic granulomatous disorder, and Quie syndrome is a diverse group of hereditary diseases in which certain cells of the immune system have difficulty forming the reactive oxygen compounds most importantly the superoxide radical due to defective phagocyte NADPH oxidase used to kill certain ingested pathogens This leads to the formation of granulomata in many organs CGD affects about 1 in 200,000 people in the United States, with about 20 new cases diagnosed each year

This condition was first discovered in 1950 in a series of 4 boys from Minnesota, and in 1957 it was named "a fatal granulomatosus of childhood" in a publication describing their disease The underlying cellular mechanism that causes chronic granulomatous disease was discovered in 1967, and research since that time has further elucidated the molecular mechanisms underlying the disease Bernard Babior made key contributions in linking the defect of superoxide production of white blood cells, to the cause of the disease In 1986, the X-linked form of CGD was the first disease for which positional cloning was used to identify the underlying genetic mutation


  • 1 Symptoms
    • 11 Atypical infections
  • 2 Genetics
  • 3 Pathophysiology
  • 4 Diagnosis
    • 41 Classification
  • 5 Treatment
    • 51 Antibiotics
    • 52 Immunomodulation
    • 53 Hematopoietic stem cell transplantation HSCT
  • 6 Prognosis
  • 7 Epidemiology
  • 8 History
  • 9 Research
  • 10 References
  • 11 External links


Classically, patients with chronic granulomatous disease will suffer from recurrent bouts of infection due to the decreased capacity of their immune system to fight off disease-causing organisms The recurrent infections they acquire are specific and are, in decreasing order of frequency:

  • pneumonia
  • abscesses of the skin, tissues, and organs
  • suppurative arthritis
  • osteomyelitis
  • bacteremia/fungemia
  • superficial skin infections such as cellulitis or impetigo

Most people with CGD are diagnosed in childhood, usually before age 5 Early diagnosis is important since these people can be placed on antibiotics to ward off infections before they occur Small groups of CGD patients may also be affected by McLeod syndrome because of the proximity of the two genes on the same X-chromosome

Atypical infections

Microscopic image of the fungus, Aspergillus fumigatus, an organism that commonly causes disease in people with chronic granulomatous disease

People with CGD are sometimes infected with organisms that usually do not cause disease in people with normal immune systems Among the most common organisms that cause disease in CGD patients are:

  • bacteria particularly those that are catalase-positive
    • Staphylococcus aureus
    • Serratia marcescens
    • Listeria species
    • E coli
    • Klebsiella species
    • Pseudomonas cepacia, aka Burkholderia cepacia
    • Nocardia
  • fungi
    • Aspergillus species Aspergillus has a propensity to cause infection in people with CGD and of the Aspergillus species, Aspergillus fumigatus seems to be most common in CGD
    • Candida species

Patients with CGD can usually resist infections of catalase-negative bacteria but are susceptible to catalase-positive bacteria Catalase is an enzyme that catalyzes the breakdown of hydrogen peroxide in many organisms In infections caused by organisms that lack catalase catalase-negative, the host with CGD is successfully able to "borrow" hydrogen peroxide being made by the organism and use it to fight off the infection In infections by organisms that have catalase catalase-positive, this "borrowing mechanism" is unsuccessful because the catalase enzyme first breaks down any hydrogen peroxide that would be borrowed from the organism Therefore in the CGD patient, hydrogen peroxide cannot be used to make oxygen radicals to fight infection, leaving the patient vulnerable to infection by catalase-positive bacteria


Most cases of chronic granulomatous disease are transmitted as a mutation on the X chromosome and are thus called an "X-linked trait" The affected gene on the X chromosome codes for the gp91 protein p91-PHOX p is the weight of the protein in kDa; the g means glycoprotein CGD can also be transmitted in an autosomal recessive fashion via CYBA and NCF1 and affects other PHOX proteins The type of mutation that causes both types of CGD are varied and may be deletions, frame-shift, nonsense, and missense

A low level of NADPH, the cofactor required for superoxide synthesis, can lead to CGD This has been reported in women who are homozygous for the genetic defect causing glucose-6-phosphate dehydrogenase deficiency G6PD, which is characterised by reduced NADPH levels


Two neutrophils among many red blood cells Neutrophils are one type of cell affected by chronic granulomatous disease

Phagocytes ie neutrophils and macrophages require an enzyme to produce reactive oxygen species to destroy bacteria after they are ingested phagocytosis, a process known as the respiratory burst This enzyme is termed "phagocyte NADPH oxidase" PHOX This enzyme oxidizes NADPH and reduces molecular oxygen to produce superoxide anions, a reactive oxygen species Superoxide is then disproportionated into peroxide and molecular oxygen by superoxide dismutase Finally, peroxide is used by myeloperoxidase to oxidize chloride ions into hypochlorite the active component of bleach, which is toxic to bacteria Thus, NADPH oxidase is critical for phagocyte killing of bacteria through reactive oxygen species

Two other mechanisms are used by phagocytes to kill bacteria:nitric oxide and proteases, but the loss of ROS-mediated killing alone is sufficient to cause chronic granulomatous disease

Defects in one of the four essential subunits of phagocyte NADPH oxidase PHOX can all cause CGD of varying severity, dependent on the defect There are over 410 known possible defects in the PHOX enzyme complex that can lead to chronic granulomatous disease


The nitroblue-tetrazolium NBT test is the original and most widely known test for chronic granulomatous disease It is negative in CGD, meaning that it does not turn blue The higher the blue score, the better the cell is at producing reactive oxygen species This test depends upon the direct reduction of NBT to the insoluble blue compound formazan by NADPH oxidase; NADPH is oxidized in the same reaction This test is simple to perform and gives rapid results, but only tells whether or not there is a problem with the PHOX enzymes, not how much they are affected

A similar test uses dihydrorhodamine DHR, in which whole blood is stained with DHR, incubated, and stimulated to produce superoxide radicals which oxidize DHR to rhodamin in cells with normal function An advanced test called the cytochrome C reduction assay tells physicians how much superoxide a patient's phagocytes can produce Once the diagnosis of CGD is established, a genetic analysis may be used to determine exactly which mutation is the underlying cause


Chronic granulomatous disease is the name for a genetically heterogeneous group of immunodeficiencies The core defect is a failure of phagocytic cells to kill organisms that they have engulfed because of defects in a system of enzymes that produce free radicals and other toxic small molecules There are several types, including:

  • X-linked chronic granulomatous disease CGD
  • autosomal recessive cytochrome b-negative CGD
  • autosomal recessive cytochrome b-positive CGD type I
  • autosomal recessive cytochrome b-positive CGD type II
  • atypical granulomatous disease


Management of chronic granulomatous disease revolves around two goals:1 diagnose the disease early so that antibiotic prophylaxis can be given to keep an infection from occurring, and 2 educate the patient about his or her condition so that prompt treatment can be given if an infection occurs


Physicians often prescribe the antibiotic trimethoprim-sulfamethoxazole to prevent bacterial infections This drug also has the benefit of sparing the normal bacteria of the digestive tract Fungal infection is commonly prevented with itraconazole, although a newer drug of the same type called voriconazole may be more effective The use of this drug for this purpose is still under scientific investigation


Interferon, in the form of interferon gamma-1b Actimmune is approved by the Food and Drug Administration for the prevention of infection in CGD It has been shown to reduce infections in CGD patients by 70% and to decrease their severity Although its exact mechanism is still not entirely understood, it has the ability to give CGD patients more immune function and therefore, greater ability to fight off infections This therapy has been standard treatment for CGD for several years

Hematopoietic stem cell transplantation HSCT

Hematopoietic stem cell transplantation from a matched donor is curative although not without significant risk


There are currently no studies detailing the long term outcome of chronic granulomatous disease with modern treatment Without treatment, children often die in the first decade of life The increased severity of X-linked CGD results in a decreased survival rate of patients, as 20% of X-linked patients die of CGD-related causes by the age of 10, whereas 20% of autosomal recessive patients die by the age of 35
Recent experience from centers specializing in the care of patients with CGD suggests that the current mortality has fallen to under 3% and 1% respectively CGD was initially termed "fatal granulomatous disease of childhood" because patients rarely survived past their first decade in the time before routine use of prophylactic antimicrobial agents The average patient now survives at least 40 years


CGD affects about 1 in 200,000 people in the United States, with about 20 new cases diagnosed each year

Chronic granulomatous disease affects all people of all races, however, there is limited information on prevalence outside of the United States One survey in Sweden reported an incidence of 1 in 220,000 people, while a larger review of studies in Europe suggested a lower rate:1 in 250,000 people


This condition was first described in 1954 by Janeway, who reported five cases of the disease in children In 1957 it was further characterized as "a fatal granulomatosus of childhood" The underlying cellular mechanism that causes chronic granulomatous disease was discovered in 1967, and research since that time has further elucidated the molecular mechanisms underlying the disease Use of antibiotic prophylaxis, surgical abscess drainage, and vaccination led to the term "fatal" being dropped from the name of the disease as children survived into adulthood


Gene therapy is currently being studied as a possible treatment for chronic granulomatous disease CGD is well-suited for gene therapy since it is caused by a mutation in single gene which only affects one body system the hematopoietic system Viruses have been used to deliver a normal gp91 gene to rats with a mutation in this gene, and subsequently the phagocytes in these rats were able to produce oxygen radicals

In 2006, two human patients with X-linked chronic granulomatous disease underwent gene therapy and blood cell precursor stem cell transplantation to their bone marrow Both patients recovered from their CGD, clearing pre-existing infections and demonstrating increased oxidase activity in their neutrophils However, long-term complications and efficacy of this therapy were unknown

In 2012, a 16-year-old boy with CGD was treated at the Great Ormond Street Hospital, London with an experimental gene therapy which temporarily reversed the CGD and allowed him to overcome a life-threatening lung disease


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  10. ^ Soler-Palacín P, Margareto C, Llobet P, et al 2007 "Chronic granulomatous disease in pediatric patients:25 years of experience" Allergol Immunopathol Madr 35 3:83–9 doi:101157/13106774 PMID 17594870 Retrieved 2009-04-08 
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  17. ^ Online Mendelian Inheritance in Man OMIM Granulomatous disease, Chronic, X-linked; CGD -306400
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  25. ^ Modern Management of Chronic Granulomatous Disease by Reinhard Segar, Division of Immunology/Hematology, University Children’s Hospital of Zurich, Zurich, Switzerland
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  31. ^ Sample, Iian 29 February 2012 "Gene therapy cures life-threatening lung infection in teenage boy" The Guardian Retrieved 6 November 2015 

External links

  • The Chronic Granulomatous Disease Association
  • Chronic Granulomatous Disorder Society
  • WASOG — World Association of Sarcoidosis and Other Granulomatous Disorders
  • Atlas of Granulomatous Diseases
  • The Immune Deficiency Foundation
  • Living With CGD

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