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Homology among RAPD fragments in interspecific comparisons

Homology among RAPD fragments in interspecific comparisons The use of RAPDs for comparative purposes relies on the assumption that similarity of fragment size is a dependable indicator of homology. To test the validity of this assumption, homology among 220 pairs of comigrating fragments from three wild sunflower species was determined. Ninety‐one per cent cross‐hybridized and/or displayed congruent restriction fragment profiles suggestive of homology. However, comparative linkage mapping data indicated that 13% of the homologous loci mapped to genomic locations that were incongruent with the majority of loci, suggestive of paralogous rather than orthologous relationships. Thus, of the 220 pairwise comparisons, only 174 (79.1%) identified loci that are useful for comparative genetic studies. These problems, as well as several other factors discussed in the text, will introduce noise into RAPD data sets and thereby reduce the probability of generating accurate estimates of genetic relationships. Recommended methods for reducing noise in RAPD data sets include increasing gel resolution and/or testing fragment homology. However, implementation of these approaches will not eliminate all uncertainties, and it is also recommended that RAPD data sets be tested for structure and reliability. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Molecular Ecology Wiley

Homology among RAPD fragments in interspecific comparisons

Molecular Ecology , Volume 5 (1) – Feb 1, 1996

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References (30)

Publisher
Wiley
Copyright
Copyright © 1996 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0962-1083
eISSN
1365-294X
DOI
10.1111/j.1365-294X.1996.tb00295.x
Publisher site
See Article on Publisher Site

Abstract

The use of RAPDs for comparative purposes relies on the assumption that similarity of fragment size is a dependable indicator of homology. To test the validity of this assumption, homology among 220 pairs of comigrating fragments from three wild sunflower species was determined. Ninety‐one per cent cross‐hybridized and/or displayed congruent restriction fragment profiles suggestive of homology. However, comparative linkage mapping data indicated that 13% of the homologous loci mapped to genomic locations that were incongruent with the majority of loci, suggestive of paralogous rather than orthologous relationships. Thus, of the 220 pairwise comparisons, only 174 (79.1%) identified loci that are useful for comparative genetic studies. These problems, as well as several other factors discussed in the text, will introduce noise into RAPD data sets and thereby reduce the probability of generating accurate estimates of genetic relationships. Recommended methods for reducing noise in RAPD data sets include increasing gel resolution and/or testing fragment homology. However, implementation of these approaches will not eliminate all uncertainties, and it is also recommended that RAPD data sets be tested for structure and reliability.

Journal

Molecular EcologyWiley

Published: Feb 1, 1996

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