Evolution by the birth-and-death process in multigene families of the vertebrate immune system

被引:636
作者
Nei, M [1 ]
Gu, X [1 ]
Sitnikova, T [1 ]
机构
[1] PENN STATE UNIV,MUELLER LAB 328,DEPT BIOL,UNIVERSITY PK,PA 16802
关键词
D O I
10.1073/pnas.94.15.7799
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Concerted evolution is often invoked to explain the diversity and evolution of the multigene families of major histocompatibility complex (MHC) genes and immunoglobulin (Ig) genes, However, this hypothesis has been controversial because the member genes of these families from the same species are not necessarily more closely related to one another than to the genes from different species, To resolve this controversy, we conducted phylogenetic analyses of several multigene families of the MHC and Ig systems. The results show that the evolutionary pattern of these families is quite different from that of concerted evolution but is in agreement with the birth-and-death model of evolution in which new genes are created by repeated gene duplication and some duplicate genes are maintained in the genome for a long time but others are deleted or become nonfunctional by deleterious mutations. We found little evidence that interlocus gene conversion plays an important role in the evolution of MHC and Ig multigene families.
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页码:7799 / 7806
页数:8
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