Mutations during Ig Gene Hypermutation Induction of C:G Transitions and A:T A Critical Role for REV1 in Regulating the

نویسندگان

  • Hiromi Mori
  • Ji-Yang Wang
  • Keiji Masuda
  • Rika Ouchida
  • Yingqian Li
  • Xiang Gao
چکیده

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Analysis of mice deficient in both REV1 catalytic activity and POLH reveals an unexpected role for POLH in the generation of C to G and G to C transversions during Ig gene hypermutation.

Multiple DNA polymerases are involved in the generation of somatic mutations during Ig gene hypermutation. Mice expressing a catalytically inactive REV1 (REV1AA) exhibit reduction of both C to G and G to C transversions and moderate decrease of A/T mutations, whereas DNA polymerase η (POLH) deficiency causes greatly reduced A/T mutations. To investigate whether REV1 and POLH interact geneticall...

متن کامل

Involvement of specialized DNA polymerases in mutagenesis by 8-hydroxy-dGTP in human cells.

The mutagenicity of an oxidized form of dGTP, 8-hydroxy-2'-deoxyguanosine 5'-triphosphate (8-OH-dGTP), was examined using human 293T cells. Shuttle plasmid DNA containing the supF gene was first transfected into the cells, and then 8-OH-dGTP was introduced by means of osmotic pressure. The DNAs replicated in the cells were recovered and then transfected into Escherichia coli. 8-OH-dGTP induced ...

متن کامل

MSH2–MSH6 stimulates DNA polymerase η, suggesting a role for A:T mutations in antibody genes

Activation-induced cytidine deaminase deaminates cytosine to uracil (dU) in DNA, which leads to mutations at C:G basepairs in immunoglobulin genes during somatic hypermutation. The mechanism that generates mutations at A:T basepairs, however, remains unclear. It appears to require the MSH2-MSH6 mismatch repair heterodimer and DNA polymerase (pol) eta, as mutations of A:T are decreased in mice a...

متن کامل

Induction of a:T mutations is dependent on cellular environment but independent of mutation frequency and target gene location.

Based on its substrate specificity, activation-induced cytidine deaminase can directly induce C:G mutations in Ig genes. However the origin of A:T mutations, which occur in a similar proportion in germinal center (GC) B cells, is unclear. Genetic evidence suggests that the induction of A:T mutations requires the components of the mismatch repair system and DNA polymerase eta (POLH). We found th...

متن کامل

Strand-biased defect in C/G transversions in hypermutating immunoglobulin genes in Rev1-deficient mice

Somatic hypermutation of Ig genes enables B cells of the germinal center to generate high-affinity immunoglobulin variants. Key intermediates in somatic hypermutation are deoxyuridine lesions, introduced by activation-induced cytidine deaminase. These lesions can be processed further to abasic sites by uracil DNA glycosylase. Mutagenic replication of deoxyuridine, or of its abasic derivative, b...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2009