PMID: 2115572Aug 1, 1990Paper

Structure and expression of the human immunoglobulin lambda genes

The Journal of Experimental Medicine
T J Vasicek, P Leder

Abstract

We determined the DNA sequence of two large regions of chromosome 22: 33.7 kb containing the C lambda complex; and 5.2 kb 5' of the functionally rearranged lambda gene from the human myeloma, U266. Analysis of these sequences reveals the complete structure of the human C lambda complex and a previously undescribed seventh C lambda region that may encode the Ke+Oz- lambda protein. The seven constant regions are organized in a tandem array, and each is preceded by a single J lambda region. lambda 1, lambda 2, lambda 3, and lambda 7 are apparently active genes, while lambda 4, lambda 5, and lambda 6 are pseudogenes. There are no other J lambda or C lambda regions within a 60-kb region surrounding the C lambda complex; however, there are at least four other lambda-like genes and lambda pseudogenes in the human genome. The lambda genes appear to have evolved via a series of gene duplication events resulting from unequal crossing over or gene conversion between the highly conserved C lambda regions on mispaired chromosomes. The lack of Alu sequences in this large segment of DNA suggests that the C lambda complex resulted from a recent amplification of a smaller Alu-free segment of DNA. Illegitimate recombination between repeated sequ...Continue Reading

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