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Journal of Heredity Advance Access published online on November 17, 2006
Journal of Heredity, doi:10.1093/jhered/esl035
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© The American Genetic Association. 2006. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org.
Received December 2, 2005
Accepted August 30, 2006

Article

First Evidence of Higher Female Recombination in a Species with Temperature-Dependent Sex Determination: the Saltwater Crocodile

Sally Robyn Isberg 1, Scott Maxwell Johnston 1, Yizhou Chen 1, and Christopher Moran 1 *

1 From the Centre for Advanced Technologies in Animal Genetics and Reproduction, Faculty of Veterinary Science, University of Sydney, NSW 2006, Australia

* To whom correspondence should be addressed.
Christopher Moran, E-mail: chrism{at}vetsci.usyd.edu.au


  Abstract

The first evidence of genetic linkage and sex-specific recombination in the order Crocodylia is reported. This study was conducted using a resource pedigree of saltwater crocodiles consisting of 16 known-breeding pairs (32 adults) and 101 juveniles. A total of 21 microsatellite loci were available for analysis. Ten of the 21 loci showed linkage with 4 linkage groups: 3 pairwise (Cj131/Cj127, CUD68/Cj101, and Cj107/Cp10) and 1 four-locus (Cj122, CUD78, Cj16, and Cj104) being found. Linkage analysis on the 21 loci revealed evidence of sex-specific differences in recombination rates. All 5 nonzero interlocus intervals were longer in females than in males, with the 4-loci linkage group 3-fold longer in females than in males (41.63 cM and 14.1 cM, respectively). This is the first report of sex-specific recombination rates in a species that exhibits temperature-dependent sex determination.


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