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Nucleic Acids Research, 1981, Vol. 9, No. 21 5725-5736
© 1981

MOLECULAR BIOLOGY

Mapping of immunoglobulin variable region genes: relationship to the ‘deletion’ model of immunoglobulin gene rearrangement

Erik Seising and Ursula Storb

Received August 18, 1981. Five families of variable region genes of mouse kappa chains were analyzed by Southern blot hybridization to determine their relative chromosomal map positions. Map positions were deduced by VK gene deletion from anti-body-producing cells expressing upstream VK genes and retention in cells expressing downstream genes. The VK regions expressed in the myelomas M0PC167, MPC11, M0PC21 and ABPC2O are members of VK families exhibiting one, three, six and six major germline hybridization bands respectively. The gene order of the five families in germline DNA was found to be Vm167 YM11 - (VM21. VA20) - VABE8 - JK - ck. As expected in a deletion model of immunoglobulin gene rearrangement, a sequence located just 5' of J1 in germline DNA was found to be absent from some antibody producing cells which had not retained any germline CK genes. However, other cell lines contained this sequence in rearranged contexts, suggesting that any deletion model of immunoglobulin V-J joining, as well as V gene mapping, must take into account the possibilities of stepwise rearrangements and reintegration of "deleted" DNA.


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