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Comparative gene mapping in Arabidopsis lyrata chromosomes 1 and 2 and the corresponding A. thaliana chromosome 1: recombination rates, rearrangements and centromere location

Published online by Cambridge University Press:  19 May 2006

BENGT HANSSON
Affiliation:
Institute of Evolutionary Biology, School of Biological Sciences, University of Edinburgh, West Mains Road, Edinburgh EH9 3JT, UK Present address: Department of Animal Ecology, Lund University, Ecology Building, 22362 Lund, Sweden.
AKIRA KAWABE
Affiliation:
Institute of Evolutionary Biology, School of Biological Sciences, University of Edinburgh, West Mains Road, Edinburgh EH9 3JT, UK
SONJA PREUSS
Affiliation:
Institute of Evolutionary Biology, School of Biological Sciences, University of Edinburgh, West Mains Road, Edinburgh EH9 3JT, UK
HELMI KUITTINEN
Affiliation:
Department of Biology, PL 3000, FIN-90014 University of Oulu, Finland
DEBORAH CHARLESWORTH
Affiliation:
Institute of Evolutionary Biology, School of Biological Sciences, University of Edinburgh, West Mains Road, Edinburgh EH9 3JT, UK
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Abstract

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To add detail to the genetic map of Arabidopsis lyrata, and compare it with that of A. thaliana, we have developed many additional markers in the A. lyrata linkage groups, LG1 and LG2, corresponding to A. thaliana chromosome 1. We used a newly developed method for marker development for single nucleotide polymorphisms present in gene sequences, plus length differences, to map genes in an A. lyrata family, including variants in several genes close to the A. thaliana centromere 1, providing the first data on the location of an A. lyrata centromere; we discuss the implications for the evolution of chromosome 1 of A. thaliana. With our larger marker density, large rearrangements between the two Arabidopsis species are excluded, except for a large inversion on LG2. This was previously known in Capsella; its presence in A. lyrata suggests that, like most other rearrangements, it probably arose in the A. thaliana lineage. Knowing that marker orders are similar, we can now compare homologous, non-rearranged map distances to test the prediction of more frequent crossing-over in the more inbreeding species. Our results support the previous conclusion of similar distances in the two species for A. lyrata LG1 markers. For LG2 markers, the distances were consistently, but non-significantly, larger in A. lyrata. Given the two species' large DNA content difference, the similarity of map lengths, particularly for LG1, suggests that crossing-over is more frequent across comparable physical distances in the inbreeder, A. thaliana, as predicted.

Type
Research Article
Copyright
2006 Cambridge University Press
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