[No authors listed]
The histone acetyltransferase p300/CBP-associated factor (PCAF) catalyzes acetylation of core histones and plays important roles in epigenetics by altering the chromatin structure in vertebrates. In this study, PCAF-deficient DT40 mutants were analyzed and it was found that PCAF participates in regulation of secretory IgM heavy chain (H-chain) synthesis. Remarkably, PCAF-deficiency causes an increase in the amount of secretory IgM H-chain mRNA, but not in that of IgM light chain and membrane-bound IgM H-chain mRNAs, resulting in dramatic up-regulation of the amount of secretory IgM protein. These findings suggest that PCAF regulates soluble antibody production and is thus an effective suppressor of secretory IgM H-chain synthesis.
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