منابع مشابه
Genome-wide somatic hypermutation.
DNA mutagenesis is generally considered harmful. Yet activated B cells normally mutate the Ig loci. Because this somatic hypermutation is potentially dangerous, it has been hypothesized that mutations do not occur throughout the genome but instead are actively targeted to the Ig loci. Here we challenge this longstanding and widely accepted hypothesis. We demonstrate that hypermutation requires ...
متن کاملGenome-Wide Detection of Genes Targeted by Non-Ig Somatic Hypermutation in Lymphoma
The processes of somatic hypermutation (SHM) and class switch recombination introduced by activation-induced cytosine deaminase (AICDA) at the Immunoglobulin (Ig) loci are key steps for creating a pool of diversified antibodies in germinal center B cells (GCBs). Unfortunately, AICDA can also accidentally introduce mutations at bystander loci, particularly within the 5' regulatory regions of pro...
متن کاملImmunoglobulin somatic hypermutation.
The immunoglobulin (Ig) repertoire achieves functional diversification through several somatic alterations of the Ig locus. One of these processes, somatic hypermutation (SHM), deposits point mutations into the variable region of the Ig gene to generate higher-affinity variants. Activation-induced cytidine deaminase (AID) converts cytidine to uridine to initiate the hypermutation process. Error...
متن کاملThe regulation of somatic hypermutation.
Somatic hypermutation and class switch recombination cause genetic alterations in immunoglobulin (Ig) genes, which underlie the generation of the secondary antibody repertoire in B lymphocytes. Both processes require activation-induced cytidine deaminase (AID), whose mechanism of action in not yet known in detail, but which mediates the accumulation of point mutations in the Ig locus. This high...
متن کاملThe biochemistry of somatic hypermutation.
Affinity maturation of the humoral response is mediated by somatic hypermutation of the immunoglobulin (Ig) genes and selection of higher-affinity B cell clones. Activation-induced cytidine deaminase (AID) is the first of a complex series of proteins that introduce these point mutations into variable regions of the Ig genes. AID deaminates deoxycytidine residues in single-stranded DNA to deoxyu...
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ژورنال
عنوان ژورنال: Proceedings of the National Academy of Sciences
سال: 2004
ISSN: 0027-8424,1091-6490
DOI: 10.1073/pnas.0402009101