IgH chain class switch recombination: mechanism and regulation.
IgH chain class switch recombination: mechanism and regulation.
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DOI:
10.4049/jimmunol.1401849
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发表时间:
2014-12-01
期刊:
影响因子:
--
通讯作者:
Schrader CE
中科院分区:
文献类型:
--
作者:
Stavnezer J;Schrader CE
Ig heavy chain class switching occurs rapidly after activation of mature naïve B cells, resulting in a switch from expressing IgM and IgD to expression of IgG, IgE, or IgA; this switch improves the ability of antibodies to remove the pathogen that induces the humoral immune response. Class switching occurs by a deletional recombination between two different switch (S) regions, each of which is associated with a heavy chain constant (CH) region gene. Class switch recombination (CSR) is instigated by activation-induced cytidine deaminase (AID), which converts cytosines in S regions to uracils. The uracils are subsequently removed by two DNA repair pathways, resulting in mutations, single-strand DNA breaks, and the double-strand breaks required for CSR. We discuss several aspects of CSR, including how CSR is induced, CSR in B-cell progenitors, the roles for transcription and chromosomal looping in CSR, and the roles of certain DNA repair enzymes in CSR.
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