Monocytopenia with susceptibility to infections- MedGen UID:
- 481660
- •Concept ID:
- C3280030
- •
- Disease or Syndrome
This primary immunodeficiency, designated IMD21, DCML, or MONOMAC, is characterized by profoundly decreased or absent monocytes, B lymphocytes, natural killer (NK) lymphocytes, and circulating and tissue dendritic cells (DCs), with little or no effect on T-cell numbers. Clinical features of IMD21 are variable and include susceptibility to disseminated nontuberculous mycobacterial infections, papillomavirus infections, opportunistic fungal infections, and pulmonary alveolar proteinosis. Bone marrow hypocellularity and dysplasia of myeloid, erythroid, and megakaryocytic lineages are present in most patients, as are karyotypic abnormalities, including monosomy 7 and trisomy 8. In the absence of cytogenetic abnormalities or overt dysplasia, hypoplastic bone marrow may initially be diagnosed as aplastic anemia. Bone marrow transplantation is the only cure. Some patients may have an increased risk of miscarriage. Both autosomal dominant transmission and sporadic cases occur. Less common manifestations of GATA2 deficiency include lymphedema and sensorineural hearing loss, a phenotype usually termed 'Emberger syndrome' (614038) (summary by Bigley et al. (2011), Hsu et al. (2011), and Spinner et al. (2014)).
Mendelian susceptibility to mycobacterial diseases due to partial STAT1 deficiency- MedGen UID:
- 862387
- •Concept ID:
- C4013950
- •
- Disease or Syndrome
Immunodeficiency-31A (IMD31A) results from autosomal dominant (AD) STAT1 deficiency. STAT1 is crucial for cellular responses to IFNA (147660)/IFNB (147640) (type I interferon) and IFNG (147570) (type III interferon). AD STAT1 deficiency selectively affects the IFNG pathway, but not the IFNA/IFNB pathway, and confers a predisposition to mycobacterial infections. Pathogens reported in IMD31A patients include bacillus Calmette-Guerin (BCG) and Mycobacterium avium complex, as well as Mycobacterium tuberculosis. IMD31A has low penetrance and a mild clinical phenotype with good prognosis for recovery (review by Al-Muhsen and Casanova, 2008).
Two patients with heterozygous STAT1 mutations have been reported with increased susceptibility to adult-onset herpes simplex encephalitis (HSE) without a history of other significant infections (Mork et al., 2015).
Autosomal dominant mendelian susceptibility to mycobacterial diseases due to partial IFNgammaR1 deficiency- MedGen UID:
- 863300
- •Concept ID:
- C4014863
- •
- Disease or Syndrome
Immunodeficiency-27B (IMD27B) results from autosomal dominant (AD) IFNGR1 deficiency. Patients with AD IFNGR1 deficiency commonly present with recurrent, moderately severe infections with environmental mycobacteria or bacillus Calmette-Guerin (BCG). In contrast with patients with complete autosomal recessive (AR) IFNGR1 deficiency (IMD27A), cells from patients with AD IFNGR1 deficiency display residual responses to IFNG in vitro, indicating that the deficiency in IFNGR1 is partial. The clinical features of AD IFNGR1 deficiency are usually less severe than those in children with complete AR IFNGR1 deficiency, and mycobacterial infection often occurs later (mean age of 13.4 years vs 1.3 years), with patients having longer mean disease-free survival. In patients with AD IFNGR1 deficiency, M. avium tends to cause unifocal or multifocal osteomyelitis. Salmonellosis is present in about 5% of patients with AR or AD IFNGR1 deficiency, and other infections have been reported in single patients (review by Al-Muhsen and Casanova, 2008).