UMMS Affiliation

Department of Molecular Genetics and Microbiology

Publication Date


Document Type



Amino Acid Sequence; Animals; Antibody Diversity; Base Sequence; DNA; DNA, Recombinant; *Genes, Immunoglobulin; Genes, Switch; Immunoglobulin gamma-Chains; Interleukin-4; Mice; Mice, Inbred BALB C; Molecular Sequence Data; Open Reading Frames; RNA; Spleen; Transcription, Genetic


Amino Acids, Peptides, and Proteins | Genetic Phenomena | Life Sciences | Medicine and Health Sciences | Women's Studies


Antibody class switching is mediated by a DNA recombination event that replaces the C mu gene with one of the other heavy (H) chain constant region (CH) genes located 3' to the C mu gene. The regulation of this process is essential to the immune response because different CH regions provide different biological functions. Correlative evidence indicates that the isotype (class) specificity of the switch is determined by the accessibility of specific CH genes as indicated by hypomethylation and transcriptional activity. For example, RNAs transcribed from specific unrearranged CH genes are induced prior to switching under conditions that promote subsequent switching to these same CH genes. The function of transcription of these germline CH genes is unknown. In this report, we describe the structure of RNA transcribed from unrearranged gamma 1 genes in mouse spleen cells treated with LPS plus a HeLa cell supernatant containing recombinant interleukin 4. The germline gamma 1 RNA is initiated at multiple start sites 5' to the tandem repeats of the gamma 1 switch (S gamma 1) region. As is true for analogous RNAs transcribed from unrearranged gamma 2b and alpha genes, the germline gamma 1 RNA has an I exon transcribed from the region 5' to S gamma 1 sequences, which is spliced at a unique site to the C gamma gene. The germline gamma 1 RNA has an open-reading frame (ORF) that potentially encodes a small protein 48 amino acid in length.


exon, immunoglobulin class switching, interleukin 4, polymerase chain reaction, recombination

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Copyright © 1990 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. CC License is Attribution 3.0 Unported

DOI of Published Version



Dev Immunol. 1990;1(1):11-7.

Journal/Book/Conference Title

Developmental immunology

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Creative Commons License

Creative Commons Attribution 3.0 License
This work is licensed under a Creative Commons Attribution 3.0 License.



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