Nijmegen Breakage Syndrome
- Author: Krystyna H Chrzanowska, MD, PhD; Chief Editor: William D James, MD more...
Nijmegen breakage syndrome (NBS) is a rare autosomal recessive condition of chromosomal instability that is clinically characterized by microcephaly, a distinct facial appearance, short stature, immunodeficiency, radiation sensitivity, and a strong predisposition to lymphoid malignancy. Mutations in the NBN (NBS1) gene located in band 8q21 are responsible for Nijmegen breakage syndrome. Nijmegen breakage syndrome is identified as entries 251260 in and 602667 in Online Mendelian Inheritance in Man. Note the images below.
In 1981, Weemaes et al first delineated the syndrome in 2 siblings with microcephaly, short stature, skin pigmentation abnormalities, mental retardation, immunologic defects, and a high prevalence of chromosome 7 and/or chromosome 14 rearrangements in cultured lymphocytes.
In 1985, Seemanova et al described a group of patients with an apparently new genetic disorder characterized by microcephaly with normal intelligence, cellular and humoral immune defects, and a striking predisposition to lymphoreticular malignancies. These cases were subsequently studied and found to fit into the category of Nijmegen breakage syndrome.
Further investigations revealed that in vitro cells derived from patients with Nijmegen breakage syndrome display characteristic abnormalities similar to those observed in ataxia-telangiectasia (A-T), including spontaneous chromosomal instability, sensitivity to ionizing radiation (IR), and radioresistant DNA synthesis (RDS).[3, 4, 5] However, aside from immune deficiency and a predisposition for malignancies (particularly those of lymphoid origin), the clinical manifestations are distinct. Consequently, Nijmegen breakage syndrome has long been considered a variant of A-T.
In 1998, on the basis of cellular phenotypes and the results of somatic cell complementation studies suggesting genetic heterogeneity, Jaspers et al proposed the term A-T variants for diseases in this group of patients. The 2 distinct groups were designated as A-T variant 1 (V1) for Nijmegen breakage syndrome and A-T variant 2 (V2) for Berlin breakage syndrome.[6, 7]
Linkage studies allowed the exclusion of the gene responsible for Nijmegen breakage syndrome from the A-T locus on band 11q23 and from the translocation breakpoints in a Polish patient. The gene, NBS1 (actually named NBN), was finally mapped to band 8q21[5, 10, 11] and cloned it in 1998,[12, 13] and mutations in this single gene were found to account for both A-T complementation groups V1 and V2.[11, 14]
Nijmegen breakage syndrome is caused by mutations in the NBN(NBS1) gene located at 8q21. The NBN gene product, nibrin, has been found to interact with at least 2 other proteins, hMre11 and Rad50. Nibrin plays a key role in regulating the activity of the M/R/N protein complex, which is involved in end-processing of both physiological and mutagenic DNA double-strand breaks (DSBs). DNA DSBs occur as intermediates in physiological events, such as V(D)J recombination during early B- and T-cell development and immunoglobulin class switch in mature B cells, but most frequently are generated by mutagenic agents such as IR and radiomimetic chemicals.[15, 16]
DNA DSBs represent the most serious DNA damage, which, if not repaired accurately, can result in genomic instability, including chromosome rearrangements or gene mutations, and finally can lead to cancer.[17, 18] Nibrin has been shown to play a crucial role in immunoglobulin class switch recombination and maintenance of the integrity of chromosomal stability.[19, 20, 21]
Because these key regulatory processes are defective in the cells of patients with Nijmegen breakage syndrome, chromosomal aberrations accumulate and immunodeficiency and gonadal failure occur.[22, 23] However, expression study of the murine Nbn gene during mouse development provides evidence that apart from sites of physiologic DSBs in the testis, thymus, and spleen, Nbn expression is also evident in several tissues and organs in which rejoining of DSBs is not known to occur.
Mutant murine models of Nijmegen breakage syndrome have recently been derived. A null mutation affecting both alleles of the homologous gene, Nbn, is embryonically lethal for knockout mice. It has also been demonstrated that the common human mutation is hypomorphic and that the expression of a truncated protein is sufficient for survival. Using humanized mouse models, e.g. with introduced the 657Δ5 mutation into Nbn gene, allowed to demonstrate pleiotropic effect of the defective protein at the cellular and organs levels.
Of particular significance was the discovery of the functional link between a network of genes that play important roles in repairing DNA damage, regulating cellular proliferation and apoptosis, and maintaining telomeric function. Defects in this network, including defects in the genes encoding ATM, NBN (NBS1), BRCA1, FANCD2, BLM, TP53, CDS1/CHK2, and others, can cause cancer.[27, 28, 29]
Not all patients with the Nijmegen breakage syndrome–like phenotype and radiation sensitivity have a defect in the NBN gene. Some of these were found to have mutations in the gene encoding DNA ligase IV (LIG4)[30, 31] and, recently, in the RAD50 gene. However, many have still-unknown defects.[33, 34, 35]
The number of Nijmegen breakage syndrome patients diagnosed and molecularly confirmed within North America cannot be estimated exactly.
The total number of patients identified worldwide is systematically increasing, probably because physicians are becoming more aware of the disorder. The largest groups of patients were diagnosed in Poland, the Czech Republic and Slovakia, Germany, and Ukraine. Nijmegen breakage syndrome has also been reported in Italy, France, Great Britain, The Netherlands, Spain, Bosnia, Croatia, Yugoslavia, Turkey, Russia, Morocco, Argentina, Chile, and New Zealand.
The relative frequency of the common c.657_661del5 mutation in the Czech Republic, Poland, and Ukraine was studied, and it was found to be unexpectedly high in these 3 Slavic populations (a mean estimated prevalence of 1 case per 177 newborns). The highest estimated frequency was reported in Sorbs, a Slavic population isolate in Northeast Saxony, Germany (1 per 34 newborns).
Malignancy is the most common cause of death in patients with Nijmegen breakage syndrome.[23, 38, 39] Other known causes of death are fatal infections leading to respiratory failure, renal or liver insufficiency, and bone marrow aplasia (aplastic anemia).
Nijmegen breakage syndrome seems to occur worldwide, with an increased prevalence among persons of Eastern European and Central European descent, particularly Czech and Polish people (founder effect).
No sex predilection is recognized for Nijmegen breakage syndrome.
Microcephaly, the most striking symptom of the disease, is usually present at birth or develops soon thereafter.
Craniofacial characteristics become more obvious as patients age.
Growth is delayed from the very earliest stages of life, in comparison with age- and sex-matched controls, but improvement of the growth rate is usually observed after age 2 years.
Longitudinal studies of Polish patients indicate a decline in intellectual function with age. Most children tested during infancy and their preschool years have IQ scores indicative of normal or borderline intelligence. A shift toward a lower level of intellectual function is observed during their school-age years. This shift becomes more evident in patients older than 14 years; at this age, all tested patients had mild or moderate mental retardation.
Progression of humoral immunodeficiency with time is observed in some children.
Most malignancies develop before patients are aged 20 years (mean age, 9 y). The youngest patient recorded to have had acute lymphoblastic leukemia was a 1-year-old girl. Cancer appears prior to the diagnosis of Nijmegen breakage syndrome in approximately 20-30% of patients.
Skin pigmentation abnormalities in the form of café au lait spots and/or vitiligo are present in more than half of Nijmegen breakage syndrome patients. Progressive vitiligo has been observed in 3 teenage patients of Polish descent.
Gray hair, which reflects progeric changes, usually appears by adolescence or early adulthood.
The longest known survival is 53 years, in an Italian woman, and 33 and 31 years in 2 men, Polish and Dutch, respectively (the latter both died from malignancy.)
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|Mutation||Exon||Mutation Type||Change in Protein||Number of Families and Origin||Allelic Status|
protein (233 aa)
protein (229 aa)
protein (236 aa)
protein (251 aa)
protein (279 aa)
protein (283 aa)
protein (305 aa)
protein (402 aa)
|*He - Heterozygous (compound with 657del5).
†Monozygotic twin-brothers (compound heterozygotes) with severe disease phenotype.
‡Ho - Homozygous.
§Three nuclear families in 1 large family; proband diagnosed first as having Fanconi anemia (FA).[67, 68]