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. 1989 Mar;8(3):735–742. doi: 10.1002/j.1460-2075.1989.tb03433.x

Isolation of scid pre-B cells that rearrange kappa light chain genes: formation of normal signal and abnormal coding joins.

T K Blackwell 1, B A Malynn 1, R R Pollock 1, P Ferrier 1, L R Covey 1, G M Fulop 1, R A Phillips 1, G D Yancopoulos 1, F W Alt 1
PMCID: PMC400869  PMID: 2785917

Abstract

Consistent with an ordered immunoglobulin (Ig) gene assembly process during precursor (pre-) B cell differentiation, we find that most Abelson murine leukemia virus (A-MuLV)-transformed pre-B cells derived from scid (severe combined immune deficient) mice actively form aberrant rearrangements of their Ig heavy chain locus but do not rearrange endogenous kappa light chain variable region gene segments. However, we have identified several scid A-MuLV transformants that transcribe the germline Ig kappa light chain constant region and actively rearrange the kappa variable region gene locus. In one case progression to the stage of kappa light chain gene rearrangement did not require expression of Ig mu heavy chains; furthermore, this progression could not be efficiently induced following expression of mu heavy chains from an introduced vector. As observed in pre-B cell lines from normal mice, attempted V kappa-to-J kappa rearrangements in scid transformants occur by inversion at least as frequently as by deletion. The inverted rearrangements result in retention of both products of the recombination event in the chromosome, thus allowing their examination. scid kappa coding sequence joins are aberrant and analogous in structure to previously described scid heavy chain coding joins. In contrast, the recognition signals that flank involved coding segments frequently are joined precisely back-to-back in normal fashion. The scid VDJ recombinase defect therefore does not significantly impair recognition of, site-specific cutting at, or juxtaposition and appropriate ligation of signal sequences. Our finding that the scid defect prevents formation of correct coding but not signal joins distinguishes these events mechanistically.

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Selected References

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