کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1935283 | 1050662 | 2008 | 5 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: DNA damage response protein ASCIZ links base excision repair with immunoglobulin gene conversion DNA damage response protein ASCIZ links base excision repair with immunoglobulin gene conversion](/preview/png/1935283.png)
ASCIZ (ATMIN) was recently identified as a novel DNA damage response protein. Here we report that ASCIZ-deficient chicken DT40 B lymphocyte lines displayed markedly increased Ig gene conversion rates, whereas overexpression of human ASCIZ reduced Ig gene conversion below wild-type levels. However, neither the efficiency of double-strand break repair nor hypermutation was affected by ASCIZ levels, indicating that ASCIZ does not directly control homologous recombination or formation of abasic sites. Loss of ASCIZ led to mild sensitivity to the base damaging agent methylmethane sulfonate (MMS), yet remarkably, suppressed the dramatic MMS hypersensitivity of polβ-deficient cells. These data suggest that ASCIZ may affect the choice between competing base repair pathways in a manner that reduces the amount of substrates available for Ig gene conversion.
Journal: Biochemical and Biophysical Research Communications - Volume 371, Issue 2, 27 June 2008, Pages 225–229