期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：1981
卷号：78
期号：6
页码：3829-3833
DOI：10.1073/pnas.78.6.3829
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：During differentiation from a stem cell to an antibody-secreting cell, the immunoglobulin genes within a B cell undergo a rearrangement that juxtaposes a variable region gene to a constant region gene. To analyze the genetic organization of an immunoglobulin gene family in nonrearranged, germ-line DNA, we have constructed a recombinant DNA library from randomly cleaved mouse kidney DNA fragments. From this library, we have isolated three overlapping recombinant clones containing the constant region gene for lambda I light chains (C lambda I). These clones spanned 24.9 kilobases of mouse DNA and contained no variable region sequences. Hybridization of these clones with lambda II cDNA demonstrated the presence of an additional constant region gene and a joining region 3.2 kilobases 5' of C lambda I. This gene was tentatively identified as C lambda III by the absence of an Ava I endonuclease site, which is present within C lambda II. The C lambda III amino acid sequence has recently been reported [Azuma, T., Steiner, L. A. & Eisen, H. N. (1981) Proc. Natl. Acad. Sci. USA 78, 569-573] and is very closely related to the C lambda II amino acid sequence.
