RNA splicing generates a variant light chain from an aberrantly rearranged κ gene

Abstract
Both Cκ regions in MPC 11 cells are rearranged into active transcription units, one producing a normal κ chain and the other an internally deleted κ fragment lacking a V region. The gene coding for the κ fragment mRNA is aberrantly rearranged and lacks a site for V → Cκ splicing. An alternative splicing event which deletes the V region from the nuclear RNA precursor generates the κ fragment mRNA.