A germline polymorphism of thymine DNA glycosylase induces genomic instability and cellular transformation.

Abstract:

:Thymine DNA glycosylase (TDG) functions in base excision repair, a DNA repair pathway that acts in a lesion-specific manner to correct individual damaged or altered bases. TDG preferentially catalyzes the removal of thymine and uracil paired with guanine, and is also active on 5-fluorouracil (5-FU) paired with adenine or guanine. The rs4135113 single nucleotide polymorphism (SNP) of TDG is found in 10% of the global population. This coding SNP results in the alteration of Gly199 to Ser. Gly199 is part of a loop responsible for stabilizing the flipped abasic nucleotide in the active site pocket. Biochemical analyses indicate that G199S exhibits tighter binding to both its substrate and abasic product. The persistent accumulation of abasic sites in cells expressing G199S leads to the induction of double-strand breaks (DSBs). Cells expressing the G199S variant also activate a DNA damage response. When expressed in cells, G199S induces genomic instability and cellular transformation. Together, these results suggest that individuals harboring the G199S variant may have increased risk for developing cancer.

journal_name

PLoS Genet

journal_title

PLoS genetics

authors

Sjolund A,Nemec AA,Paquet N,Prakash A,Sung P,Doublié S,Sweasy JB

doi

10.1371/journal.pgen.1004753

subject

Has Abstract

pub_date

2014-11-06 00:00:00

pages

e1004753

issue

11

eissn

1553-7390

issn

1553-7404

pii

PGENETICS-D-14-01765

journal_volume

10

pub_type

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