Abstract:
:The recombination-activating gene 1 (RAG1) and RAG2 proteins initiate V(D)J recombination, the process that assembles the B- and T-lymphocyte antigen receptor genes of jawed vertebrates. RAG1 and RAG2 are thought to have arisen from a transposable element, but the origins of this element are not understood. We show that two ancestral RAG1 proteins, Transib transposase and purple sea urchin RAG1-like, have a latent ability to initiate V(D)J recombination when coexpressed with RAG2 and that in vitro transposition by Transib transposase is stimulated by RAG2. Conversely, we report low levels of V(D)J recombination by RAG1 in the absence of RAG2. Recombination by RAG1 alone differs from canonical V(D)J recombination in having lost the requirement for asymmetric DNA substrates, implicating RAG2 in the origins of the "12/23 rule," a fundamental regulatory feature of the reaction. We propose that evolution of RAG1/RAG2 began with a Transib transposon whose intrinsic recombination activity was enhanced by capture of an ancestral RAG2, allowing for the development of adaptive immunity.
journal_name
Genes Devjournal_title
Genes & developmentauthors
Carmona LM,Fugmann SD,Schatz DGdoi
10.1101/gad.278432.116subject
Has Abstractpub_date
2016-04-15 00:00:00pages
909-17issue
8eissn
0890-9369issn
1549-5477pii
gad.278432.116journal_volume
30pub_type
杂志文章abstract::The organizer region, or dorsal blastopore lip, plays a central role in the initiation of gastrulation and the formation of the body axis during Xenopus development. A similar process can also be induced in ectodermal explants by activin or by injection of activin mRNA into embryos. We have searched early embryo-speci...
journal_title:Genes & development
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pub_type: 更正并重新发布的文章,杂志文章
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