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. 1981 Jul;78(7):4495–4499. doi: 10.1073/pnas.78.7.4495

Multiple differences between the nucleic acid sequences of the IgG2aa and IgG2ab alleles of the mouse.

P H Schreier, A L Bothwell, B Mueller-Hill, D Baltimore
PMCID: PMC319818  PMID: 6170065

Abstract

To compare the structure of IgG2a alleles we have determined the complete DNA sequence of the constant region, coding sequence, and 3' untranslated region of a cDNA clone, pAB gamma 2a-1, which was derived from the C57BL/6 mouse strain (b allotype). This sequence was compared with the corresponding IgG2a DNA sequence of BALB/c origin (a allotype). The DNA sequences showed 10% differences, and the deduced protein sequences differed by about 15%. These differences were not evenly distributed: most differences were in the hinge region, the CH3 domain and the 3' untranslated region. It is evident that many alterations in the IgG2a alleles have occurred since the a and b haplotypes were separated--some of these changes were point mutations but some appear to have resulted from gene conversion of the IgG2ab allele by the IgG2bb allele.

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Selected References

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