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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 

Genetics, genomics, and molecular biology of sex determination in small animals.

The genomic revolution is beginning to facilitate advances in canine and feline medicine, as illustrated in our research. Our studies are focused upon identifying the gene mutation that causes canine Sry-negative XX sex reversal, a disorder of sex determination in which chromosomal females (78,XX) develop testicular tissue, becoming either XX true hermaphrodites with ovotestes, or XX males with bilateral testes. A genome-wide screen, using mapped markers in our pedigree of Sry-negative XX sex reversed dogs founded upon the American cocker spaniel, identified five chromosomal regions in which the causative gene may be located. The canine genome was used to identify the canine homologue of goat Pisrt1 and so determine that canine and caprine Sry-negative XX sex reversal are genetically heterogeneous. A second goal of our research is to determine the molecular mechanism by which the mutation causes testis induction. Thus far, we have reported gonadal Sry and Sox9 expression patterns in normal embryos, which have temporal and spatial patterns similar to those reported in humans, sheep, and pigs. Once gene mutations causing such inherited disorders are identified, DNA tests will become a part of general veterinary practice, advancing both diagnostic techniques and preventative medicine.[1]

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