| Balancing selection on electrophoretic variation of phosphoglucose isomerase in two species of field cricket: Gryllus veletis and G. offnsylvanicus. | |
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MedLine Citation:
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PMID: 9335598 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Two species of crickets, Gryllus veletis and G. pennsylvanicus, share six electrophoretic mobility classes for the enzyme phosphoglucose isomerase (PGI), despite evidence from other genetic markers that the two species are not closely related within eastern North American field crickets. Moreover, the frequencies of the two most common PGI electrophoretic classes (PGI-100 and PGI-65) covary in sympatric populations of these species in the eastern United States, suggesting that PGI may be subject to trans-specific balancing selection. To determine the molecular basis of the electrophoretic variation, we characterized the DNA sequence of the Pgi gene from 29 crickets (15 G. veletis and 14 G. pennsylvanicus). Amino acid substitutions that distinguish the electrophoretic classes are not the same in the two species, and there is no evidence that specific replacement substitutions represent trans-specific polymorphism. In particular, the amino acids that diagnose the PGI-65 allele relative to the PGI-100 allele differ both between G. veletis and G. pennsylvanicus and within G. pennsylvanicus. The heterogeneity among electrophoretic classes that covary in sympatric populations coupled with analysis of patterns of nucleotide variation suggest that Pgi is not evolving neutrally. Instead, the data are consistent with balancing selection operating on an emergent property of the PGI protein. |
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Authors:
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L A Katz; R G Harrison |
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Publication Detail:
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Type: Journal Article; Research Support, U.S. Gov't, Non-P.H.S. |
Journal Detail:
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Title: Genetics Volume: 147 ISSN: 0016-6731 ISO Abbreviation: Genetics Publication Date: 1997 Oct |
Date Detail:
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Created Date: 1997-12-08 Completed Date: 1997-12-08 Revised Date: 2010-09-10 |
Medline Journal Info:
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Nlm Unique ID: 0374636 Medline TA: Genetics Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 609-21 Citation Subset: IM |
Affiliation:
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Section of Ecology and Systematics, Cornell University, Ithaca, New York 14853, USA. lkatz@science.smith.edu |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals DNA, Complementary Electrophoresis, Cellulose Acetate Glucose-6-Phosphate Isomerase / genetics* Gryllidae / enzymology*, genetics Polymorphism, Genetic Sequence Homology, Nucleic Acid Species Specificity |
| Chemical | |
Reg. No./Substance:
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0/DNA, Complementary; EC 5.3.1.9/Glucose-6-Phosphate Isomerase |
| Comments/Corrections | |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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