Dc. Scherer et al., COREPRESSION OF RELA AND C-REL INHIBITS IMMUNOGLOBULIN-KAPPA GENE-TRANSCRIPTION AND REARRANGEMENT IN PRECURSOR B-LYMPHOCYTES, Immunity, 5(6), 1996, pp. 563-574
Multiple members of the NF-kappa B/Rel protein family are induced duri
ng B cell differentiation and have been implicated in transcriptional
activation of the immunoglobulin kappa (Ig kappa) locus. Despite these
findings, normal numbers of Ig kappa(+) B lymphocytes are produced by
mice bearing targeted mutations in individual NF-kappa B/Rel genes. I
n the present study, precursor B lymphocytes were engineered to expres
s a trans-dominant form of I kappa B alpha that simultaneously impairs
the c-Rel and RelA transactivating subunits of NF-kappa B. This dual
block in NF-kappa B/Rel signaling led to potent inhibition of germline
Igh transcription and rearrangement, whereas recombinase activity was
unaffected. These findings suggest that c-Rel and RelA serve compensa
tory functional roles in the developmental mechanisms that govern Ig k
appa gene assembly.