TY - JOUR
T1 - Mutation frequencies and spectra in DNA polymerase η-deficient mice
AU - Busuttil, Rita A.
AU - Lin, Qingcong
AU - Stambrook, Peter J.
AU - Kucherlapati, Raju
AU - Vijg, Jan
PY - 2008/4/1
Y1 - 2008/4/1
N2 - The low-fidelity polymerase η (polη) is required for bypass of UV-induced pyrimidine dimers inserting adenine nucleotides opposite these lesions. Mutations in the polη gene are responsible for the genetic defect in xeroderma pigmentosum variant patients. To study if the lackof polη significantly elevates spontaneous mutation frequency in various organs and tissues of the mouse, we crossed polη-deficient mice with transgenic mice harboring a chromosomally integrated lacZ-plasmid reporter construct. In cultured embryonic fibroblasts from the lacZ-polη-/- mice, 2.5 J/m2 UV irradiation induced ∼5-fold more mutations than in cells from lacZ control mice, in which an ∼3-fold increase in mutation frequency was found compared with the normal level. Whereas untreated cells harbored mainly 1-bp deletions, UV induced both transitions and transversions, with the latter type more highly represented in the polη-null cells than in the controls. No difference in mutation induction between the polH-null cells and the wild-type cells was observed after treatment with N-ethyl-N-nitrosourea. Having shown the validity of the lacZ model to accurately identify polη-associated mutagenesis, we then determined the mutant frequency at the lacZ locus in liver, spleen, and small intestine of 12-month-old animals. No differences were found between polη-null, heterozygous, or littermate control mice. We conclude that the polη defect is specific for UV damage and has no effect on in vivo mutagenesis in mice.
AB - The low-fidelity polymerase η (polη) is required for bypass of UV-induced pyrimidine dimers inserting adenine nucleotides opposite these lesions. Mutations in the polη gene are responsible for the genetic defect in xeroderma pigmentosum variant patients. To study if the lackof polη significantly elevates spontaneous mutation frequency in various organs and tissues of the mouse, we crossed polη-deficient mice with transgenic mice harboring a chromosomally integrated lacZ-plasmid reporter construct. In cultured embryonic fibroblasts from the lacZ-polη-/- mice, 2.5 J/m2 UV irradiation induced ∼5-fold more mutations than in cells from lacZ control mice, in which an ∼3-fold increase in mutation frequency was found compared with the normal level. Whereas untreated cells harbored mainly 1-bp deletions, UV induced both transitions and transversions, with the latter type more highly represented in the polη-null cells than in the controls. No difference in mutation induction between the polH-null cells and the wild-type cells was observed after treatment with N-ethyl-N-nitrosourea. Having shown the validity of the lacZ model to accurately identify polη-associated mutagenesis, we then determined the mutant frequency at the lacZ locus in liver, spleen, and small intestine of 12-month-old animals. No differences were found between polη-null, heterozygous, or littermate control mice. We conclude that the polη defect is specific for UV damage and has no effect on in vivo mutagenesis in mice.
UR - http://www.scopus.com/inward/record.url?scp=42049112761&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=42049112761&partnerID=8YFLogxK
U2 - 10.1158/0008-5472.CAN-07-6274
DO - 10.1158/0008-5472.CAN-07-6274
M3 - Article
C2 - 18381412
AN - SCOPUS:42049112761
SN - 0008-5472
VL - 68
SP - 2081
EP - 2084
JO - Cancer research
JF - Cancer research
IS - 7
ER -