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• W2211023578 abstract "In order to generate a transgenic mouse producing human antibodies, three human loci (HC, LCκ et LCλ) were reconstituted in the form of circular YAC. Then, to simplify the manipulation of genes encoding the heavy chain, four vectors summarizing the genetic information contained in the human heavy chain locus were designed and cloned. The HC Minilocus (78 kbp) is composed of 13 V segments, a synthetic DJ cluster and the genes encoding the constant parts Cμ, Cɣ3 and Cɣ1. Three other constructions (~22 kbp) were derived from the intermediate cloning steps. They are based on 7 V segments and a DJ region synthesized. The HC Microlocus Classic (22 kbp) was obtained after cloning of the gene encoding the constant part ɣ1 in 3' of the V , D and J elements mentioned above; this construct encodes the heavy chain of IgG1 (ɣ1 HC). The HC Microlocus Light (21.5 kb) contains the gene encoding ɣ1 CH1-, therefore, this construction encodes IgG1 HC without CH1 domain (ɣ1HC CH1-). Such HC are expressed without being associated with light chain (Heavy Chain only antibodies). Finally, the HC Microlocus Light shRNA (22 kb) is based on the HC Microlocus Light to which was added a sequence encoding four shRNA (small hairpin RNA) to repress the murine IgM expression. This locus is designed to be injected into wild type mouse. The functionality of the four reduced human HC constructs was assessed in mouse cells. The 300-19 cell line was used because is a pro-B cell line able to rearrange endogenous or transgenic Ig genes and to express the rearranged genes as Ig proteins. 300-19 cells were transduced with the four reduced human HC constructs and the expression of the transgenic Ig genes was investigated in detail. Indeed, DJ and VDJ rearrangement, recombinatory diversity, junctional diversity, transcription, mRNA maturation, alternative splicing, Ig surface expression and secretion were assessed. The data demonstrated that these constructs undergo editing and processing in murine cells and give rise to a large diversity of human heavy chains. The HC Microlocus Light was injected in HC knock out mouse oocytes and the HC Microlocus Light shRNA (which is exactly identical to the Microlocus Light concerning the antibody gene part) in wild type mouse oocytes. Injection in wild type mice led to human γ1 HC expression, whereas injections in HC KO mice did not show any B cell population reconstitution and consequently no human HC γ1 expression. Transgenic human ɣ1 HC and endogenous mouse IgM are co-expressed at the surface of progenitor-, immature- and mature B cells." @default.
• W2211023578 created "2016-06-24" @default.
• W2211023578 creator A5025143445 @default.
• W2211023578 date "2014-05-20" @default.
• W2211023578 modified "2023-09-27" @default.
• W2211023578 title "Generation of transgenic vectors encoding human immunoglobulins, functionality assays and transgenesis in mice" @default.
• W2211023578 hasPublicationYear "2014" @default.
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