Extreme variation in apoptosis capacity amongst lymphoid cells of Nijmegen breakage syndrome patients.
Standard
Extreme variation in apoptosis capacity amongst lymphoid cells of Nijmegen breakage syndrome patients. / Thierfelder, Nadja; Demuth, Ilja; Burghardt, Nadine; Schmelz, Karin; Sperling, Karl; Chrzanowska, Krystyna H; Seemanova, Eva; Digweed, Martin.
In: EUR J CELL BIOL, Vol. 87, No. 2, 2, 2008, p. 111-121.Research output: SCORING: Contribution to journal › SCORING: Journal article › Research › peer-review
Harvard
APA
Vancouver
Bibtex
}
RIS
TY - JOUR
T1 - Extreme variation in apoptosis capacity amongst lymphoid cells of Nijmegen breakage syndrome patients.
AU - Thierfelder, Nadja
AU - Demuth, Ilja
AU - Burghardt, Nadine
AU - Schmelz, Karin
AU - Sperling, Karl
AU - Chrzanowska, Krystyna H
AU - Seemanova, Eva
AU - Digweed, Martin
PY - 2008
Y1 - 2008
N2 - The human genetic disorder, Nijmegen breakage syndrome (NBS), is characterised by radiosensitivity, immunodeficiency and an increased risk for cancer, particularly lymphoma. The NBS1 gene codes for a protein, nibrin, involved in the processing/repair of DNA double strand breaks and in cell cycle checkpoints. The majority of patients (>90%) are homozygous for a founder mutation. Despite this genetic homogeneity, the syndrome shows considerable clinical variability, for example, in age at development of a malignancy. We hypothesised that one reason for such variation might be individual differences in the clearance of heavily damaged precancerous cells by apoptosis. To test this hypothesis we have examined a set of 30 lymphoblastoid B-cell lines from NBS patients for their capacity to enter into apoptosis after a DNA-damaging treatment. There was a substantial 40-fold variation in apoptosis between cell lines from different patients. NBS patient cell lines could be grouped into a large, apoptosis-deficient group and a smaller group with essentially normal apoptotic response to DNA damage. In both groups, cell lines were proficient in TP53 phosphorylation and stabilisation after the same DNA-damaging treatment. Thus the observed variation in apoptosis capacity is not due to failure to activate TP53. Despite the large variation in apoptosis, no statistically significant correlation between apoptotic capacity of patient cell lines and clinical course of the disease was apparent.
AB - The human genetic disorder, Nijmegen breakage syndrome (NBS), is characterised by radiosensitivity, immunodeficiency and an increased risk for cancer, particularly lymphoma. The NBS1 gene codes for a protein, nibrin, involved in the processing/repair of DNA double strand breaks and in cell cycle checkpoints. The majority of patients (>90%) are homozygous for a founder mutation. Despite this genetic homogeneity, the syndrome shows considerable clinical variability, for example, in age at development of a malignancy. We hypothesised that one reason for such variation might be individual differences in the clearance of heavily damaged precancerous cells by apoptosis. To test this hypothesis we have examined a set of 30 lymphoblastoid B-cell lines from NBS patients for their capacity to enter into apoptosis after a DNA-damaging treatment. There was a substantial 40-fold variation in apoptosis between cell lines from different patients. NBS patient cell lines could be grouped into a large, apoptosis-deficient group and a smaller group with essentially normal apoptotic response to DNA damage. In both groups, cell lines were proficient in TP53 phosphorylation and stabilisation after the same DNA-damaging treatment. Thus the observed variation in apoptosis capacity is not due to failure to activate TP53. Despite the large variation in apoptosis, no statistically significant correlation between apoptotic capacity of patient cell lines and clinical course of the disease was apparent.
M3 - SCORING: Zeitschriftenaufsatz
VL - 87
SP - 111
EP - 121
JO - EUR J CELL BIOL
JF - EUR J CELL BIOL
SN - 0171-9335
IS - 2
M1 - 2
ER -
