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DNA sequence of the murine gamma 1 switch segment reveals novel structural elements.

M R Mowatt and W A Dunnick
J Immunol April 1, 1986, 136 (7) 2674-2683;
M R Mowatt
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W A Dunnick
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Abstract

Immunoglobulin heavy chain switch regions are segments of DNA considered to be important in mediating class switching in B lymphocytes. Whereas these segments vary in length among the different murine isotypes, their structural organization schemes are all based on the tandem repetition of unit sequences. We previously showed that the S gamma 1 segment unexpectedly contains sequence elements that differ significantly from its prevalent unit repeat (49mer). Here we extend this preliminary characterization by determining the complete nucleotide sequence of the cloned S gamma 1 segment from BALB/c DNA. We find that S gamma 1 consists of more than 120 tandemly repeated 49mers. In addition, we show that the previously identified non-49mer sequences are part of a direct repeat element about 350 bp in length (DR II), which exists in two copies at the 5' end of S gamma 1. We also show that another unrelated direct repeat element about 500 bp long (DR I) exists near the 5' and 3' ends of S gamma 1. Thus, the structure of the S gamma 1 segment might be may be abbreviated as 5'-DRII-(49mer)15-DRI-DRII-(49mer)n-DRI , where n is between 40 and 160. Our results of Southern hybridization experiments suggest that this basic structural scheme is maintained in eight different Igh haplotypes, although S gamma 1 segments in different Igh haplotypes include different numbers of 49mer elements. Other murine S gamma segments differ in size among various Igh loci, but to a lesser extent than S gamma 1. At the level of tandemly repeated sequences, S gamma 1, S gamma 3, and S gamma 2b represent three distinct, nonoverlapping sets of sequences.

  • Copyright © 1986 by American Association of Immunologists

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The Journal of Immunology
Vol. 136, Issue 7
1 Apr 1986
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DNA sequence of the murine gamma 1 switch segment reveals novel structural elements.
M R Mowatt, W A Dunnick
The Journal of Immunology April 1, 1986, 136 (7) 2674-2683;

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DNA sequence of the murine gamma 1 switch segment reveals novel structural elements.
M R Mowatt, W A Dunnick
The Journal of Immunology April 1, 1986, 136 (7) 2674-2683;
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Print ISSN 0022-1767        Online ISSN 1550-6606