Immunoglobulin Heavy Chain Switch Region Recombination Within a Retroviral Vector in Murine Pre-B Cells

Overview

Journal EMBO J

Specialties Biotechnology
Molecular Biology

Date 1987 Mar 1

PMID 3034595

Citations 16

Authors

D E Ott

F W Alt

K B Marcu

Affiliations

Soon will be listed here.

Abstract

We have employed a retroviral vector, ZN(Smu/S gamma 2b)tk1, as a substrate for detecting the presence of immunoglobulin heavy chain constant region (CH) gene switch (S) recombination activity in murine pre-B cells. ZN(Smu/S gamma 2b)tk1 contains a neomycin (neo) resistance gene in addition to the herpes simplex virus thymidine kinase (Htk) gene which is positioned between murine Smu and S gamma 2b sequences. Stable acquisition of the ZN(Smu/S gamma 2b)tk1 vector was selected in G-418 and switch region recombination within these proviruses was selected by resistance to the drug bromodeoxyuridine (BUdR). Fluctuation analyses of ZN(Smu/S gamma 2b)tk1 infected 18-8tk- and 38B9tk- pre-B lines revealed Htk gene inactivations with apparent frequencies of 5 X 10(-5) and 1 X 10(-5) events/cell/generation, respectively, while G-418 resistant Ltk- fibroblasts lost the HTK phenotype at an apparent rate of 4 X 10(-8). Southern blot analysis demonstrated that switch recombination caused the deletion of the Htk gene in all pre-B clones examined while the loss of Htk in Ltk- clones was not mediated by S region recombination. In 21 out of 24 pre-B clones, the recombinations involved the tandemly repetitive portions of the Smu and S gamma 2b sequences. These results demonstrate that the CH gene S region segments inserted into ZN(Smu/S gamma 2b)tk1 are sufficient for B-cell-specific recombination/deletion within the S region tandem repeats.

Citing Articles

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AID to overcome the limitations of genomic information by introducing somatic DNA alterations.

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Evidence for class-specific factors in immunoglobulin isotype switching.

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