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The immunoglobulin lambda locus in rat consists of two C lambda genes and a single V lambda gene.

The immunoglobin lambda locus of the rat has been studied. Germ-line V lambda and C lambda genes were isolated from recombinant-phage libraries and characterized by nucleotide sequencing. The results showed that the lambda locus of the rat contains one single V lambda gene and two C lambda genes, thus representing one of the least complex lambda loci so far characterized. The two C lambda genes are separated by a spacer approx. 3 kb long. Two J segments are located at the 5' side of each C lambda gene. One of the C lambda genes (C lambda 1) probably represents a pseudogene, as the J lambda 1 segments have non-functional recombination and splice signals. The organization of the rat lambda locus resembles that of mouse, except that only one cluster is present in the rat. Thus since the evolutionary separation of the rat and mouse species ten MYR ( = 10(6) years) ago, either one cluster has been lost from the rat, or duplicated in the mouse.