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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Koshland, M. E. Yagi, M. |
| Abstract | During B cell differentiation, transcription of the J chain gene is initiated. To determine the regulatory mechanism involved, we have analyzed the structure of the J chain gene in cell lines representing successive stages in B cell development. Comparison of restriction sites showed that the J chain gene does not require a rearrangement of DNA for expression; cleavage sites present in embryonic J chain DNA were preserved through all the subsequent differentiative steps. However, comparison of 5-methylcytosine contents showed that J chain gene expression correlates with a loss of methyl groups. The J chain gene was heavily methylated in cell types not expressing J chain (i.e., embryo and lymphomas representative of immature and mature B cells) and significantly less methylated in cell lines representative of antigen-stimulated lymphocytes synthesizing J chain. These changes in J chain gene methylation represent a specific differentiation-induced response. Analyses of the heavy chain C mu and C gamma 2b genes, which are expressed at earlier and later stages than the J chain gene, showed that the C mu sequences were undermethylated in all cell types examined whereas the C gamma 2b sequences were undermethylated only in cell lines expressing the IgG2b protein. The primary encounter of a B cell with antigen must therefore trigger events that effect J chain gene transcription through a mechanism involving loss of methyl groups from cytosine. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 8 |
| Volume Number | 78 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1981-01-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | B-Lymphocytes Physiology Cytosine Analogs & Derivatives Immunoglobulin J-Chains Genetics 5-Methylcytosine Animals Cell Differentiation Gene Expression Regulation Genes Immunoglobulin Gamma-Chains Immunoglobulin Mu-Chains Methylation Mice Recombination, Genetic Transcription, Genetic Research Support, U.S. Gov't, P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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