Nucleic Acids Research, 1980, Vol. 8, No. 8 1693-1707
© 1980
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Two rearranged immunoglobulin kappa light chain genes in one mouse myeloma
Institut für Physiologische Chemie, Physikalische Biochemie und Zellbiologie der Universitat München GFR
Received March 3, 1980.
The organization of immunoglobulin gene segments coding for kappa light chains has been studied in uncloned and cloned DNA from mouse liver and a mouse myeloma. It is known that the C (constant, ref. 2) gene segment is present in the tumor DNA on two EcoRI fragments of 14 and 20 kb and in liver DNA on a 15 kb fragment. The 14 kb myeloma and the 15 kb liver fragment have been cloned previously. Here we report on the cloning of the 20 kb myeloma fragment and present detailed restriction maps covering about 22 kb of DNA surrounding the C gene segment in liver and tumor DNA. The region on the 20 kb fragment has been localized where a DNA rearrangement had occurred. The presence of two rearranged kappa light chain genes in one tumor is discussed in regard to the molecular basis of allelic exclusion.
1Present address: Division of Biology, California Institute of Technology, Pasadena, California 91125, USA.
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