Rearrangements of immunoglobulin gene and oncogenes in ocular adnexal pseudolymphoma.
The organization of immunoglobulin heavy chain (IgH), light chain (kappa and lambda) and T cell receptor (TCR) beta chain gene loci in 10 patients with ocular adnexal pseudolymphoma was investigated. Eight of them showed IgH gene rearrangement in at least one of the 3 restriction enzymes-digested DNAs extracted from ocular adnexal neoplasms. In contrast, none of them exhibited clonal TCR beta chain gene rearrangement. The configuration of bcl-1, bcl-2 and c-myc oncogenes was also studied by Southern blot technique. Two patients had a rearranged joining region, IgH-containing fragment that comigrated with the rearranged bcl-1 fragment. C-myc gene rearrangement was found in only one patient who also had bcl-1 gene rearrangement. In ocular adnexal pseudolymphoma, none demonstrated bcl-2 gene rearrangement; however, in bone marrow cells, one patient with systemic lymphadenopathy exhibited both IgH and bcl-2 gene rearrangements. Three genotypic subsets of these ocular adnexal pseudolymphoma can be identified by the configuration of IgH gene and related oncogenes: with germline configuration of IgH gene and bcl-1, bcl-2 and c-myc oncogenes; with rearrangement of IgH gene but germline configuration of these oncogenes; and with recombination between rearranged IgH and bcl-1 genes. These results suggest in ocular adnexal pseudolymphoma a spectrum of clonal change evolving from polyclonal to monoclonal B-population, and further to monoclonal B-population with rearranged bcl-1, c-myc and/or bcl-2 oncogenes.
Chen
P M
PM
Department of Internal Medicine, Veterans General Hospital, Taipei, Taiwan Republic of China.
Liu
J H
JH
Lin
S H
SH
Hsu
W M
WM
Kao
S C
SC
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019938:Cyclin D1; D004273:DNA, Neoplasm / Q000032:analysis; D005142:Eyelid Neoplasms / Q000235:genetics*; D015321:Gene Rearrangement; D005803:Genes, Immunoglobulin / Q000235:genetics*; D016259:Genes, myc / Q000235:genetics; D006801:Humans; D008223:Lymphoma / Q000235:genetics*; D008297:Male; D008875:Middle Aged; D009918:Orbital Neoplasms / Q000235:genetics*; D011518:Proto-Oncogene Proteins / Q000235:genetics; D019253:Proto-Oncogene Proteins c-bcl-2; D011948:Receptors, Antigen, T-Cell / Q000235:genetics; D016693:Receptors, Antigen, T-Cell, alpha-beta
D004273:DNA, Neoplasm; D011518:Proto-Oncogene Proteins; D019253:Proto-Oncogene Proteins c-bcl-2; D011948:Receptors, Antigen, T-Cell; D016693:Receptors, Antigen, T-Cell, alpha-beta; D019938:Cyclin D1