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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1983 May;80(9):2671–2675. doi: 10.1073/pnas.80.9.2671

Unusual evolutionary conservation and frequent DNA segment exchange in class I genes of the major histocompatibility complex.

H Hayashida, T Miyata
PMCID: PMC393889  PMID: 6573677

Abstract

From comparisons of homologous DNA sequences for many different genes, it was shown that the silent positions of protein-encoding regions and introns evolve at high and remarkably similar rates for different genes. In addition, both silent positions and introns behave like clocks; they accumulated base substitutions at approximately constant rates with respect to geological time. The rates of evolution were estimated to be 5.5 X 10(-9), 3.7 X 10(-9), and 5.3 X 10(-9) per site per year for silent positions, short introns (less than approximately equal to 300 base pairs), and long introns (more than approximately equal to 500 base pairs), respectively. Contrary to expectation from the evolutionary clocks, DNA sequence comparison between pHLA 12.4 (a cloned HLA sequence) of man and Ld together with other H-2 genes of mouse, the class I genes of the major histocompatibility complex, revealed a surprisingly small amount of base substitution for both the introns and the silent positions; the degree of divergence is only about 60% of that of standard genes in the same species comparison. Furthermore, several segmental homologies have been observed between the class I genes of mouse, suggesting the frequent occurrence of gene conversion or double unequal crossing-over in evolution. Interrelations between the extreme polymorphism of the class I genes, the low evolutionary drift of the introns and the silent positions, and the frequent gene conversion or unequal crossing-over within the mouse genes are discussed.

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Selected References

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