Document Detail

Gene conversion may aid adaptive peak shifts.
MedLine Citation:
PMID:  11093835     Owner:  NLM     Status:  MEDLINE    
Gene conversion is often viewed as a homogenizing force that opposes adaptive evolution. The objective of this study is to suggest a potential role for gene conversion in adaptive evolution of proteins through aiding the transfer of a population from one adaptive peak to another. Our hypothesis starts with the observation that a tandem gene duplication may result in an extra gene copy that is released from selective constraints. In such cases, individually deleterious mutations may accumulate on the extra copy of the gene, and through gene conversion these mutations may subsequently be presented to the functioning gene for selection en masse. Thus, groups of mutations that jointly confer a selective advantage may regularly be made available for selection. We present a mathematical model of this process and identify the range of rates of gene conversion, gene duplication and mutation under which it may operate. The results indicate that the process may be biologically feasible if the rate of appearance of the potentially beneficial mutations is not too small in relation to the rates of null mutation and of gene conversion. This process appears to be a possible mechanism for effecting adaptive peak shifts in large populations. We show that all the evolutionary steps in the proposed model may have occurred in the evolution of primate gamma -globin genes. We suggest that hide-and-release mechanisms for genetic variation may constitute a more general principal of evolvability.
T F Hansen; A J Carter; C H Chiu
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Journal of theoretical biology     Volume:  207     ISSN:  0022-5193     ISO Abbreviation:  J. Theor. Biol.     Publication Date:  2000 Dec 
Date Detail:
Created Date:  2000-12-27     Completed Date:  2001-02-15     Revised Date:  2009-11-19    
Medline Journal Info:
Nlm Unique ID:  0376342     Medline TA:  J Theor Biol     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  495-511     Citation Subset:  IM    
Copyright Information:
Copyright 2000 Academic Press.
Department of Ecology and Evolutionary Biology, Yale University, 165 Prospect St., New Haven, CT 06520, USA.
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MeSH Terms
Adaptation, Physiological*
Computer Simulation*
Gene Conversion*
Gene Frequency
Genes, Duplicate
Globins / genetics
Models, Genetic*
Primates / embryology,  genetics
Selection, Genetic*
Reg. No./Substance:

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