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Originally published as Genetics Published Articles Ahead of Print on June 11, 2007.
Genetics, Vol. 176, 2131-2138, August 2007, Copyright © 2007
doi:10.1534/genetics.107.074138
Predicting and Testing Physical Locations of Genetically Mapped Loci on Tomato Pachytene Chromosome 1
Song-Bin Chang*,1,
Lorinda K. Anderson*,
,
Jamie D. Sherman
,
Suzanne M. Royer* and
Stephen M. Stack*,,2
* Department of Biology and Plant Molecular Biology Program, Colorado State University, Fort Collins, Colorado 80523 and Department of Plant, Soil, and Environmental Sciences, Montana State University, Bozeman, Montana 59717-3120
2 Corresponding author: Department of Biology, 1878 Campus Delivery, Colorado State University Fort Collins, CO 80523-1878.
E-mail: sstack{at}lamar.colostate.edu
Predicting the chromosomal location of mapped markers has been difficult because linkage maps do not reveal differences in crossover frequencies along the physical structure of chromosomes. Here we combine a physical crossover map based on the distribution of recombination nodules (RNs) on Solanum lycopersicum (tomato) synaptonemal complex 1 with a molecular genetic linkage map from the interspecific hybrid S. lycopersicum x S. pennellii to predict the physical locations of 17 mapped loci on tomato pachytene chromosome 1. Except for one marker located in heterochromatin, the predicted locations agree well with the observed locations determined by fluorescence in situ hybridization. One advantage of this approach is that once the RN distribution has been determined, the chromosomal location of any mapped locus (current or future) can be predicted with a high level of confidence.
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Genetics 2007 176: NP.
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