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Journal of Heredity Advance Access published online on April 6, 2005
Journal of Heredity, doi:10.1093/jhered/esi058
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© The American Genetic Association. 2005. All rights reserved. For Permissions, please email: journals.permissions@oupjournals.org.
Received October 20, 2004
Accepted January 3, 2005

Article

Exclusion of Lhx9 as a Candidate Gene for Sry-Negative XX Sex Reversal in the American Cocker Spaniel Model

S. Pujar 1, K. S. Kothapalli 1, E. Kirkness 2, R. H. Van Wormer 1, and V. N. Meyers-Wallen 1*

1 From the J. A. Baker Institute for Animal Health, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853
2 Institute for Genomic Research (TIGR), Rockville, MD 20850

* To whom correspondence should be addressed.
V. N. Meyers-Wallen, E-mail: vnm1{at}cornell.edu


  Abstract

XX sex reversal is known in 17 breeds of dogs. In the American cocker spaniel, it segregates as an autosomal recessive trait, and the affected animals lack the testis determining Sry gene. In the search for an autosomal gene that causes this trait, we considered the possibility of Lhx9, a gene encoding LIM homeobox containing transcription factor 9, as a candidate gene. An American cocker spaniel pedigree showing Sry-negative XX sex reversal phenotype was genotyped with an intronic Lhx9 microsatellite marker. Segregation of the Lhx9 marker in the pedigree indicated that a mutation in canine Lhx9 is not likely to be the cause of Sry-negative XX sex reversal. In addition, using the recently available 7.6X canine genomic sequence, we report the location and genomic organization of canine Lhx9.


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