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. 1984 Dec;4(12):2905–2910. doi: 10.1128/mcb.4.12.2905

Molecular basis of heavy-chain class switching and switch region deletion in an Abelson virus-transformed cell line.

R DePinho, K Kruger, N Andrews, S Lutzker, D Baltimore, F W Alt
PMCID: PMC369304  PMID: 6098827

Abstract

We demonstrated that a subclone of an Abelson murine leukemia virus-transformed B-lymphoid cell line switched from mu to gamma 2b expression in vitro, by the classical recombination-deletion mechanism. In this line, the expressed VHDJH region and the C gamma 2b constant region gene were juxtaposed by a recombination event which linked the highly repetitive portions of the S mu and S gama 2b regions and resulted in the loss of the C mu gene from the intervening region. An additional recombination event in this subclone involved an internal deletion in the S mu region of the expressed (switched) allele. One end of this deletion occurred very close to the switch recombination point. Despite the recombination-deletion mechanism of switching, the gamma 2b-producing line retained two copies of the C mu gene and two copies of the sequence just 5' to the S gamma 2b recombination point. The possible significance of the retention of these sequences to the mechanism of class switching is discussed.

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Selected References

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