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. 1983 May;80(10):2995–2999. doi: 10.1073/pnas.80.10.2995

Structure of the human immunoglobulin C epsilon 2 gene, a truncated pseudogene: implications for its evolutionary origin.

H Hisajima, Y Nishida, S Nakai, N Takahashi, S Ueda, T Honjo
PMCID: PMC393960  PMID: 6407005

Abstract

Cloning of the overlapping DNA fragments together with Southern hybridization experiments showed the organization of the human C epsilon and C alpha gene cluster as 5'-C epsilon 2-14 kilobases-C alpha 1----C epsilon 1-13 kilobases-C alpha 2-3'. Comparison of the nucleotide sequences of the C epsilon 1 and C epsilon 2 genes revealed that four deletions have taken place in the C epsilon 2 gene and its flanking regions. The three deleted regions in the 5' side of the C epsilon 2 gene are partially filled with shorter inserted sequences. One of them has removed the CH1 and CH2 exons and a portion of the epsilon switch (S epsilon) region. The S epsilon region and the CH4 exon still retain the functional structures, whereas the CH3 exon has been inactivated by deleting its 5' intervening sequence necessary for splicing. The tetranucleotide T-G-G-G (or T-G-G-C), which is usually found in close proximity of the class-switch recombination sites in mouse myelomas, is located 5' to the three deletion sites. The results imply that the mechanism responsible for the heavy chain class-switch recombination might be relevant to the evolutionary mechanism of creation of the truncated C epsilon 2 gene. The other deletion in the 3' flanking region of the C epsilon 2 gene may be due to slipped mispairing of the short direct repeat (C-C-C-C-C) at both ends.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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